CN115348807A

CN115348807A - Control method applied to indirect evaporative cooling system and indirect evaporative cooling system

Info

Publication number: CN115348807A
Application number: CN202210997063.3A
Authority: CN
Inventors: 高海军; 秦明海; 张振; 宋彬; 柴兵
Original assignee: Qingdao Hisense Network Energy Co ltd
Current assignee: Qingdao Hisense Network Energy Co ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2022-11-15
Anticipated expiration: 2042-08-19
Also published as: CN115348807B

Abstract

The embodiment of the application provides a control method applied to an indirect evaporative cooling system and the indirect evaporative cooling system, wherein the method comprises the following steps: collecting outdoor dry bulb temperature and outdoor wet bulb temperature; determining the working mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature, the outdoor wet bulb temperature and the preset energy-saving mode of the indirect evaporative cooling system, wherein the energy-saving mode comprises an electricity-saving mode or a water-saving mode; controlling the cooling system to cool according to a working mode, wherein the working mode corresponding to the power saving mode cools through a spraying module and a fan module in the indirect evaporative cooling system; and the working mode corresponding to the water-saving mode is cooled by a refrigeration compressor in the indirect evaporative cooling system. The technical scheme of this application embodiment can reduce the influence of weather environment to indirect evaporative cooling system cooling effect to satisfy the cooling demand of treating the air that cools down and carrying out the cooling.

Description

Control method applied to indirect evaporative cooling system and indirect evaporative cooling system

Technical Field

The application relates to the technical field of indirect evaporative cooling, in particular to a control method applied to an indirect evaporative cooling system and the indirect evaporative cooling system.

Background

The indirect evaporative cooling technology is a technology capable of efficiently utilizing a natural cold source to refrigerate, and a system applying the indirect evaporative cooling technology is called an indirect evaporative cooling system and is generally suitable for cooling in the fields of data centers, workshops and the like.

In the related art, when the indirect evaporative cooling system is applied to a data center, outdoor air is conveyed by an outdoor fan of the indirect evaporative cooling system to exchange heat with air to be cooled in a heat exchange core of the indirect evaporative cooling system, the air to be cooled in the heat exchange core is conveyed by an indoor fan of the indirect evaporative cooling system, and the air to be cooled in the heat exchange core after being cooled is conveyed to the data center by the indoor fan, so that the purpose of cooling and refrigerating the data center is achieved.

However, the cooling effect of the outdoor air is easily affected by weather changes, and the outdoor air is adopted to cool in high-temperature weather, so that the outdoor air cannot meet the cooling requirement for cooling the air to be cooled.

Disclosure of Invention

In order to solve the technical problem, embodiments of the present application provide a control method and apparatus applied to an indirect evaporative cooling system, a computer-readable storage medium, an electronic device, and an indirect evaporative cooling system.

According to an aspect of an embodiment of the present application, there is provided a control method applied to an indirect evaporative cooling system, including: collecting outdoor dry bulb temperature and outdoor wet bulb temperature; determining the working mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature, the outdoor wet bulb temperature and the preset energy-saving mode of the indirect evaporative cooling system, wherein the energy-saving mode comprises an energy-saving mode or a water-saving mode; controlling the indirect evaporative cooling system to cool according to the working mode; the working mode corresponding to the electricity-saving mode is cooled through a spraying module and a fan module in the indirect evaporative cooling system; and the working mode corresponding to the water-saving mode is cooled by a refrigeration compressor in the indirect evaporative cooling system.

In another exemplary embodiment, the determining the operation mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature and the outdoor wet bulb temperature and the preset energy saving mode of the indirect evaporative cooling system includes: if the outdoor dry bulb temperature is greater than the preset dry bulb switching temperature, the outdoor wet bulb temperature is less than the preset wet bulb switching temperature, and the preset energy-saving mode of the indirect evaporative cooling system is the power-saving mode, determining that the working mode of the indirect evaporative cooling system is the wet working condition mode; the controlling the indirect evaporative cooling system to cool according to the working mode comprises: starting a spraying module of the indirect evaporative cooling system, and starting a fan module of the indirect evaporative cooling system according to a preset air supply temperature set value and a preset air return temperature set value; and adjusting the operating power of the fan module according to the difference between the actual air supply temperature of the fan module and the air supply temperature set value and the difference between the actual return air temperature of the fan module and the return air temperature set value.

In another exemplary embodiment, the determining the operation mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature and the outdoor wet bulb temperature and the preset energy saving mode of the indirect evaporative cooling system includes: if the outdoor dry bulb temperature is higher than the preset dry bulb switching temperature, the outdoor wet bulb temperature is lower than the preset wet bulb switching temperature, and the preset energy-saving mode of the indirect evaporative cooling system is a water-saving mode, determining that the working mode of the indirect evaporative cooling system is a mixed dry working condition mode; the controlling the indirect evaporative cooling system to cool according to the working mode comprises: and starting a fan module of the indirect evaporative cooling system according to a preset first operating power threshold value, and starting a refrigeration module of the indirect evaporative cooling system, wherein the refrigeration module comprises at least one refrigeration compressor.

In another exemplary embodiment, the refrigeration module comprises an inverter refrigeration compressor and a fixed frequency refrigeration compressor; the refrigeration module for starting the indirect evaporative cooling system comprises: starting the variable-frequency refrigeration compressor, and adjusting the working frequency of the variable-frequency refrigeration compressor according to the difference between the actual air supply temperature of the fan module and the air supply temperature set value and the difference between the actual air return temperature of the fan module and the air return temperature set value; and if the working frequency of the variable-frequency refrigeration compressor reaches a preset first working frequency threshold value and the actual air supply temperature is greater than the air supply temperature set value, starting the fixed-frequency refrigeration compressor.

In another exemplary embodiment, the fixed frequency refrigerant compressor is plural in number; the method further comprises the following steps: if the actual air supply temperature reaches the set air supply temperature value, acquiring the respective corresponding operation time of the plurality of fixed-frequency refrigeration compressors; determining a shutdown sequence of the plurality of constant frequency refrigeration compressors according to the running time of the plurality of constant frequency refrigeration compressors; and controlling to close the plurality of fixed-frequency refrigeration compressors according to the shutdown sequence.

In another exemplary embodiment, the method further comprises: if the working frequency of the variable-frequency refrigeration compressor reaches a preset second working frequency threshold value and the fixed-frequency refrigeration compressor is not started, judging whether the air supply temperature of the fan module reaches a preset air supply temperature set value or not; wherein the second operating frequency threshold is less than the first operating frequency threshold; if the judgment result is yes, the variable-frequency refrigeration compressor is closed.

In another exemplary embodiment, the method further comprises: and after the working frequency of the variable-frequency refrigeration compressor reaches the first working frequency threshold value and the fixed-frequency refrigeration compressor is started, if the actual air supply temperature is higher than the air supply temperature set value, starting a spraying module of the indirect evaporative cooling system.

In another exemplary embodiment, the method further comprises: starting timing after the working frequency of the variable-frequency refrigeration compressor reaches the first working frequency threshold value; acquiring the time length of the working frequency kept as the first working frequency threshold, and judging whether the time ratio of the time length in a preset first timing interval reaches a preset ratio value or not; if the frequency conversion refrigerating compressor is judged to be the first working frequency threshold, the working frequency of the frequency conversion refrigerating compressor is determined to reach the first working frequency threshold.

According to an aspect of an embodiment of the present application, there is provided an indirect evaporative cooling system including: the sensor assembly is used for acquiring outdoor dry bulb humidity and outdoor wet bulb humidity; and the controller is electrically connected with the sensor assembly and reads prestored computer readable instructions to execute the control method applied to the indirect evaporative cooling system in the embodiment.

In another exemplary embodiment, the system further comprises: the fan module is used for conveying air; the spraying module is used for spraying liquid to cool; the refrigeration module is used for changing the temperature of air and comprises a variable-frequency refrigeration compressor and a fixed-frequency refrigeration compressor; the fan module, the spraying module and the refrigerating module are respectively electrically connected with the controller, so that the fan module, the spraying module and the refrigerating module are controlled by the controller to cool the indirect evaporative cooling system.

According to an aspect of embodiments of the present application, there is provided a computer-readable storage medium having stored thereon computer-readable instructions, which, when executed by a processor of a computer, cause the computer to execute a control method applied to an indirect evaporative cooling system as described in the above embodiments.

According to an aspect of an embodiment of the present application, there is provided an electronic device including: one or more processors; a storage device for storing one or more programs which, when executed by the one or more processors, cause the electronic device to implement the control method applied to an indirect evaporative cooling system as described in the above embodiments.

In the technical scheme of this application embodiment, indirect evaporative cooling system combines outdoor dry bulb temperature and outdoor wet bulb temperature, and the information of the three aspects of the energy-conserving mode that indirect evaporative cooling system predetermines determines indirect evaporative cooling system's mode, and control indirect evaporative cooling system according to the mode of work that determines and cool down, thereby reduce the influence of weather environment to indirect evaporative cooling system cooling effect, in order to satisfy the cooling demand that the air of treating the cooling carries out the cooling, in addition, according to water conservation mode or the economize on electricity mode that include in the energy-conserving mode, in order to confirm the cooling means that indirect evaporative cooling system was suitable for when carrying out the cooling work, avoid the waste of resource.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a schematic view of an indirect evaporative cooling system to which the present application relates.

FIG. 2 is a flow chart illustrating a control method applied to an indirect evaporative cooling system in accordance with an exemplary embodiment of the present application.

Fig. 3 is a flow chart of step S220 in the embodiment shown in fig. 2 in an example embodiment.

Fig. 4 is a flow chart of step S220 in the embodiment shown in fig. 3 in another example embodiment.

Fig. 5 is a flow chart of step S420 in the embodiment shown in fig. 4 in an example embodiment.

Fig. 6 is a flowchart of another exemplary control method applied to an indirect evaporative cooling system, which is proposed based on the embodiment shown in fig. 5.

Fig. 7 is a flowchart of another exemplary control method applied to an indirect evaporative cooling system, which is proposed based on the embodiment shown in fig. 5.

Fig. 8 is a block diagram illustrating a control apparatus applied to an indirect evaporative cooling system according to an exemplary embodiment of the present application.

Fig. 9 is a schematic structural diagram of an electronic device according to an exemplary embodiment of the present application.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.

The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.

The flowcharts shown in the figures are illustrative only and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.

It should be noted that: reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an indirect evaporative cooling system according to the present application. The exemplary indirect evaporative cooling system 100 is provided with a heat exchanging core 101, a sensor assembly, a fan module, a spray module, a refrigeration module, and a controller.

Heat exchanging core 101 is a conductor for conducting heat to the air to be cooled. The sensor assembly includes a temperature sensor for acquiring outdoor dry bulb temperature and outdoor wet bulb temperature. The fan module is used for conveying air, and comprises an indoor fan 102 for conveying air to be cooled and an outdoor fan 103 for conveying outdoor air. The spraying module is used for spraying liquid for cooling, and comprises a water tank 104, a water pump 105, a water replenishing valve 106, a drain valve 107, an exhaust valve 108 and a spray head 109 which are mutually communicated by adopting pipelines. The refrigeration module is used for changing the temperature of air, and comprises a variable-frequency refrigeration compressor 110, a fixed-frequency refrigeration compressor 111, an electronic expansion valve 112, an evaporator 113 and a condenser 114.

The controller is respectively connected with the sensor assembly, the fan module, the spraying module and each electric device in the refrigeration module, controls the fan module, the spraying module and the refrigeration module to start and stop each device through acquiring the outdoor dry bulb temperature and the outdoor wet bulb temperature acquired by the sensor assembly, thereby achieving the purpose of adjusting the working mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature and the outdoor wet bulb temperature, and controlling the indirect evaporative cooling system to cool according to the working mode. For a detailed process of adjusting the operation mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature and the outdoor wet bulb temperature, reference is made to the following description in the embodiments, which is not repeated herein.

It should be understood that fig. 1 is a schematic diagram of an exemplary indirect evaporative cooling system, and does not represent a limitation on the structure of the indirect evaporative cooling system. In practical application scenarios, the indirect evaporative cooling system may include different components from the structure shown in fig. 1, such as more or less components than the structure shown in fig. 1, and is not limited herein.

Fig. 2 is a flowchart illustrating a control method applied to an indirect evaporative cooling system according to an exemplary embodiment of the present application. It should be noted that the method is applicable to the indirect evaporative cooling system shown in fig. 1, and the method may be specifically executed by a controller provided in the indirect evaporative cooling system shown in fig. 1, for example, a computer readable instruction is stored in the controller in advance, or a computer readable instruction is stored in a memory provided in the indirect evaporative cooling system, and the controller executes the control method by reading the computer readable instruction.

The method provided by the present embodiment will be described in detail below with a controller as an exemplary execution subject. As shown in fig. 2, in an exemplary embodiment, the method at least includes steps S210 to S230, which are described in detail as follows:

in step S210, an outdoor dry bulb temperature and an outdoor wet bulb temperature are collected.

Firstly, it should be noted that, in the indirect evaporative cooling system, outdoor air is used to contact air to be cooled in the heat exchange core, and the sensible heat temperature difference between the two air is used as a driving force, so that the heat of the air to be cooled is conducted to the outdoor air through the outer wall of the heat exchange core, and the purpose of cooling the air to be cooled is achieved.

Therefore, the cooling effect of the indirect evaporative cooling system is correlated with the outdoor temperature, and in the embodiment of the application, the outdoor dry bulb temperature and the outdoor wet bulb temperature can be collected through the temperature sensor, wherein the outdoor dry bulb temperature represents the temperature exposed in the air but not directly irradiated by the sun; the outdoor wet bulb temperature represents a temperature at which the humidity in the air reaches saturation.

In step S220, the working mode of the indirect evaporative cooling system is determined according to the outdoor dry bulb temperature and the outdoor wet bulb temperature, and the preset energy saving mode of the indirect evaporative cooling system.

In the embodiment of the application, after the outdoor dry bulb temperature and the outdoor wet bulb temperature are collected, the working mode of the indirect evaporative cooling system can be determined according to the outdoor dry bulb temperature and the outdoor wet bulb temperature and the preset energy-saving mode of the indirect evaporative cooling system.

When the outdoor dry bulb temperature and the outdoor wet bulb temperature are used as conditions for determining the working mode of the indirect evaporative cooling system, the outdoor dry bulb temperature and the outdoor wet bulb temperature can be continuously collected for multiple times in a time period, and the corresponding average values of the outdoor dry bulb temperature and the outdoor wet bulb temperature are calculated, so that the influence of the outdoor dry bulb temperature and the outdoor wet bulb temperature on the determination of the working mode is reduced according to the average values of the outdoor dry bulb temperature and the outdoor wet bulb temperature for multiple times as the conditions.

In addition, the energy-saving mode preset by the indirect evaporative cooling system is used for representing the temperature reduction means applied when the indirect evaporative cooling system processes the air.

The energy saving mode includes a power saving mode and a water saving mode. The cooling means corresponding to the power saving mode can be that liquid is sprayed by the outdoor air conveyed by the fan module, so that the temperature of the outdoor air is reduced, and the heat of the air to be cooled in the heat exchange core body is absorbed by the outdoor air sprayed with the liquid, so that the purpose of cooling the air to be cooled is achieved. The cooling means corresponding to the water-saving mode can be used for cooling the air to be cooled through the refrigeration compressor so as to cool the air to be cooled.

It should also be noted that the indirect evaporative cooling system may be configured with different operation modes to adapt to different cooling operations, and the operation modes include, but are not limited to, a dry mode, a wet mode, a mixed dry mode, and a mixed wet mode. For the process of each working mode, please refer to the description in the following embodiments, which will not be described herein.

In step S230, the indirect evaporative cooling system is controlled to cool down according to the determined operation mode.

In the embodiment of the application, after the working mode of the indirect evaporative cooling system is determined according to the outdoor dry bulb temperature, the outdoor wet bulb temperature and the preset energy-saving mode of the indirect evaporative cooling system, the cooling system is controlled to cool according to the determined working mode.

The working mode corresponding to the power saving mode can be cooled through a spraying module and a fan module in the indirect evaporative cooling system; the working mode corresponding to the water-saving mode can be cooled by a refrigeration compressor in the indirect evaporative cooling system.

Through the embodiment, after the indirect evaporative cooling system collects the outdoor dry bulb temperature and the outdoor wet bulb temperature, the working mode of the indirect evaporative cooling system can be determined according to the outdoor dry bulb temperature and the outdoor wet bulb temperature, so that when the refrigeration effect of the outdoor air affected by weather factors on the air to be cooled is reduced, the working mode of the indirect evaporative cooling system is ensured to meet the cooling requirement of the air to be cooled; and an applicable cooling means can be selected according to an energy-saving mode preset by the indirect evaporative cooling system, so that the waste of resources is avoided.

Referring to fig. 3, fig. 3 is a flowchart of step S220 in an exemplary embodiment in the embodiment shown in fig. 2. As shown in fig. 3, the process of determining the operation mode of the indirect evaporative cooling system according to the outdoor dry-bulb temperature and the outdoor wet-bulb temperature and the preset energy saving mode of the indirect evaporative cooling system may include steps S310 to S330, which are described in detail as follows:

in step S310, if the outdoor dry bulb temperature is greater than the preset dry bulb switching temperature, the outdoor wet bulb temperature is less than the preset wet bulb switching temperature, and the preset energy saving mode of the indirect evaporative cooling system is the power saving mode, it is determined that the operating mode of the indirect evaporative cooling system is the wet working mode.

It should be noted that the dry-bulb switching temperature and the wet-bulb switching temperature are used for indicating the temperature requirement of the outdoor air for cooling the air to be cooled, that is, when the outdoor dry-bulb temperature and the outdoor wet-bulb temperature corresponding to the outdoor air reach the dry-bulb switching temperature and the wet-bulb switching temperature, it indicates that the current outdoor air cannot meet the temperature requirement for cooling the air to be cooled, and thus the required cooling effect cannot be achieved. Correspondingly, the dry-bulb switching temperature and the wet-bulb switching temperature can be adjusted according to different temperature requirements of users.

In an embodiment of the application, after the outdoor dry bulb temperature and the outdoor wet bulb temperature are collected, if the outdoor dry bulb temperature is greater than a preset dry bulb switching temperature, the outdoor wet bulb temperature is less than a preset wet bulb switching temperature, and a preset energy-saving mode of the indirect evaporative cooling system is an electricity-saving mode, it is determined that a working mode of the indirect evaporative cooling system is a wet working condition mode.

Because outdoor dry bulb temperature is equivalent to the actual temperature of outdoor air, if outdoor dry bulb temperature is less than preset dry bulb switching temperature, that is to say, current outdoor air satisfies the cooling demand of treating the air that cools down, alright with outdoor air drive to the heat transfer core directly through the fan module that starts indirect evaporative cooling system to cool down the air of cooling down to treating in the heat transfer core, above-mentioned control process is indirect evaporative cooling system's dry operating mode promptly.

However, if the outdoor dry bulb temperature is greater than the preset dry bulb switching temperature and the outdoor wet bulb temperature is less than the preset wet bulb switching temperature, it indicates that the actual temperature of the outdoor air is high, and it is not suitable to directly adopt the outdoor air to perform heat exchange with the air to be cooled in the cooling process, and the humidity saturation temperature corresponding to the outdoor air leaves a room for performing humidification processing to cool the actual temperature of the outdoor air. The energy-saving mode preset by the indirect evaporative cooling system is considered to be the power-saving mode, that is, the refrigeration compressor is not preferentially driven by electricity to cool the outdoor air. Therefore, the wet working condition mode of the indirect evaporative cooling system can be selected for cooling.

In step S320, the spray module of the indirect evaporative cooling system is started, and the fan module of the indirect evaporative cooling system is started according to the preset supply air temperature setting value and the preset return air temperature setting value.

The supply air temperature represents the temperature of the air to be cooled after the cooling process, and the return air temperature represents the temperature of the gas to be cooled entering the cooling process. The air supply temperature set value and the air return temperature set value can be adjusted according to actual cooling requirements so as to meet different cooling conditions.

In the embodiment of this application, when confirming indirect evaporative cooling system's operating mode is wet operating mode, just control starts indirect evaporative cooling system's the module that sprays, and start indirect evaporative cooling system's fan module according to predetermined air supply temperature setting value and predetermined return air temperature setting value, thereby carry out liquid through the outdoor air that sprays the module and carry out liquid spraying to the fan module, in order to cool down this outdoor air, and then carry out the heat conduction by the outdoor air that sprays liquid and the gas of waiting to cool down in the cooling processing procedure, reach the purpose of cooling the air of waiting to cool down.

In step S330, the operating power of the fan module is adjusted according to the difference between the actual supply air temperature of the fan module and the supply air temperature setting, and the difference between the actual return air temperature of the fan module and the return air temperature setting.

It should be noted that the actual supply air temperature represents an actual temperature corresponding to the gas to be cooled, which is conveyed by the indoor fan of the fan module and is subjected to the cooling process. The actual return air temperature represents the actual temperature corresponding to the gas to be cooled which is conveyed by the indoor fan of the fan module and enters the cooling process.

In the embodiment of this application, in order to accelerate the gaseous cooling rate of waiting to cool down, can be according to the difference between the actual air supply temperature of fan module and the air supply temperature set value and the difference between the actual return air temperature of fan module and the return air temperature set value adjust the operating power of fan module.

In addition, corresponding PID (Proportional Integral Derivative) control parameters can be set for the indoor fan and the outdoor fan respectively, so that PID control of the operating power of the indoor fan and the operating power of the outdoor fan can be realized, and the stability of cooling the gas to be cooled can be improved on the premise of increasing the cooling speed of the fan module.

Through the embodiment, when the outdoor dry bulb temperature is determined to be greater than the preset dry bulb switching temperature, the outdoor wet bulb temperature is determined to be less than the preset wet bulb switching temperature, and the preset energy-saving mode is the power-saving mode, the cooling requirement for cooling the air to be cooled is met under the condition of saving power resources. Alright with the priority water resource of using, start the outdoor air that the module of spraying carried outdoor fan promptly and cool down to cooling down this outdoor air, and then carry out the heat conduction by the outdoor air that sprays liquid and the gas of waiting to cool down in the cooling processing procedure, reach the purpose that the air of waiting to cool down of cooling, satisfy the cooling demand.

Referring to fig. 4, fig. 4 is a flowchart of step S220 in another exemplary embodiment in the embodiment shown in fig. 2. As shown in fig. 3, the process of determining the operation mode of the indirect evaporative cooling system according to the outdoor dry-bulb temperature and the outdoor wet-bulb temperature and the preset energy saving mode of the indirect evaporative cooling system may include steps S410 to S420, which are described in detail as follows:

in step S410, if the outdoor dry bulb temperature is greater than the preset dry bulb switching temperature, the outdoor wet bulb temperature is less than the preset wet bulb switching temperature, and the preset energy saving mode of the indirect evaporative cooling system is the water saving mode, it is determined that the working mode of the indirect evaporative cooling system is the mixed dry working mode.

In the embodiment of the application, after the outdoor dry bulb temperature and the outdoor wet bulb temperature are collected, if the outdoor dry bulb temperature is greater than the preset dry bulb switching temperature, the outdoor wet bulb temperature is less than the preset wet bulb switching temperature, and the preset energy-saving mode of the indirect evaporative cooling system is the water-saving mode, the working mode of the indirect evaporative cooling system is determined to be the mixed dry working condition mode.

Because the outdoor air that carries the fan module through spraying the module and carry out the in-process of cooling down the processing, can need to use a large amount of water to spray, comparatively consume water. Therefore, under the condition that the energy-saving mode preset by the indirect evaporative cooling system is the water-saving mode, the mixed dry working condition mode that the refrigeration compressor is driven by electric power to cool the outdoor air is adopted.

In step S420, a fan module of the indirect evaporative cooling system is started according to a preset first operating power threshold, and a refrigeration module of the indirect evaporative cooling system is started.

It should be noted that the first operating power threshold is represented as a maximum allowed operating power of the fan module, and a specific value of the first operating power threshold may be adjusted according to a device parameter of the fan module, which is not limited herein.

In the embodiment of the application, after the working mode of the indirect evaporative cooling system is determined to be the mixed dry working condition mode, the fan module is controlled to be started according to the preset first running power threshold value, and the refrigeration module of the indirect evaporative cooling system is controlled to be started.

For example, the indoor fan and the outdoor fan corresponding to the fan module in fig. 1 are started, and the operating powers of the indoor fan and the outdoor fan are both adjusted to 90%, that is, the first operating power threshold is 90%; at least one refrigeration compressor that the refrigeration module in fig. 1 contains is started afterwards and the air to be cooled that indoor fan carried is cooled down and is handled, because the air to be cooled down carries out preliminary cooling through outdoor air earlier and handles, is cooled down by the refrigeration module secondary again to the messenger treats that the air of cooling down satisfies the cooling demand.

Through the embodiment, when the outdoor dry bulb temperature is determined to be higher than the preset dry bulb switching temperature, the outdoor wet bulb temperature is lower than the preset wet bulb switching temperature, and the preset energy-saving mode is the water-saving mode, the cooling requirement for cooling the air to be cooled is met under the condition of saving water resources. Alright with priority use power resource, start the refrigeration module promptly and carry out the secondary cooling to the air of waiting to cool down through the preliminary cooling of outdoor air to reach the purpose of cooling the air of waiting to cool down, satisfy the cooling demand.

Referring to fig. 5, fig. 5 is a flow chart of step S420 in an exemplary embodiment in the embodiment shown in fig. 4, under the condition that the refrigeration module includes an inverter refrigeration compressor and a fixed-frequency refrigeration compressor. As shown in fig. 5, the process of starting up the refrigeration module of the indirect evaporative cooling system may include steps S510 to S520, which are described in detail as follows:

in step S510, the inverter refrigeration compressor is started, and the operating frequency of the inverter refrigeration compressor is adjusted according to the difference between the actual supply air temperature of the fan module and the supply air temperature setting, and according to the difference between the actual return air temperature of the fan module and the return air temperature setting.

It should be noted that the variable frequency refrigeration compressor can control the cooling effect by changing its own operating frequency, and the fixed frequency refrigeration compressor can only be started or stopped by switching on or off the power supply, thereby controlling the cooling effect. Therefore, the frequency conversion refrigeration compressor not only enables the adjustment of the refrigerating capacity corresponding to the cooling effect to be more accurate, but also saves more electricity compared with a fixed frequency refrigeration compressor.

In the embodiment of the application, when the refrigeration module of the indirect evaporative cooling system is determined to be started, the variable-frequency refrigeration compressor is started preferentially, and the working frequency of the variable-frequency refrigeration compressor is adjusted according to the difference between the actual air supply temperature and the difference between the actual air return temperature of the fan module and the set value of the air return temperature.

In addition, corresponding PID control parameters can be set for the variable-frequency refrigeration compressor, so that PID control of the working frequency of the variable-frequency refrigeration compressor is realized, the cooling speed of the variable-frequency refrigeration compressor can be increased, and the stability of cooling the gas to be cooled can be further improved.

In step S520, if the operating frequency of the inverter refrigeration compressor reaches the preset first operating frequency threshold and the actual supply air temperature is greater than the supply air temperature setting value, the fixed-frequency refrigeration compressor is started.

It should be noted that the first operating frequency threshold is expressed as a maximum allowable operating power of the inverter refrigeration compressor, and a specific value of the first operating frequency threshold may be adjusted according to equipment parameters of the inverter refrigeration compressor, which is not limited herein.

In the embodiment of the application, if the operating frequency of the variable frequency refrigeration compressor reaches the preset first operating frequency threshold value and the actual air supply temperature is greater than the air supply temperature set value, it indicates that the variable frequency refrigeration compressor still cannot reach the expected cooling demand for the refrigeration effect of the air to be cooled, so that the fixed frequency refrigeration compressor can be started, and the air to be cooled is further cooled.

In an example, after the working frequency of the inverter refrigeration compressor reaches the first working frequency threshold, timing may be started, and a time length during which the working frequency is kept at the first working frequency threshold is obtained, and whether a time ratio of the time length in a preset first timing interval reaches a preset ratio value is judged; the first timing interval represents a timing interval corresponding to the starting of timing after the working frequency of the variable-frequency refrigeration compressor reaches a first working frequency threshold value, and the duty ratio represents the time length of the working frequency which should be kept at the first working threshold value in the first timing interval when the working frequency of the variable-frequency refrigeration compressor is determined to reach the first working frequency threshold value. The first timing interval and the ratio value can be flexibly adjusted according to the requirements of users so as to meet different use conditions.

And if the time ratio of the time length in the preset first timing interval is judged to reach the preset ratio, determining that the working frequency of the variable-frequency refrigeration compressor reaches the first working frequency, thereby avoiding the influence on the control process of the cooling treatment caused by the transient fluctuation of the working frequency of the variable-frequency refrigeration compressor.

In addition, the mode of starting the fixed-frequency refrigeration compressor can be flexibly set according to the requirement. In one example, if only one fixed-frequency refrigeration compressor is arranged, the fixed-frequency refrigeration compressor is directly started; if a plurality of fixed-frequency refrigeration compressors are arranged, the shutdown time interval of each fixed-frequency refrigeration compressor is obtained. The off-time gap represents the time interval between the constant frequency refrigeration compressor and the last switching from the on state to the off state. After the stop time interval corresponding to each fixed-frequency refrigeration compressor is obtained, the starting sequence of the plurality of fixed-frequency refrigeration compressors is determined according to the stop time interval, and the plurality of fixed-frequency refrigeration compressors are controlled to be started according to the starting sequence, so that the overload operation of the fixed-frequency refrigeration compressors is avoided, and the service life of the fixed-frequency refrigeration compressors is prolonged.

In another example, if a plurality of fixed-frequency refrigeration compressors with different frequencies are arranged, the amount to be refrigerated is calculated according to the difference between the actual supply air temperature of the fan module and the supply air temperature set value and the difference between the actual return air temperature of the fan module and the return air temperature set value; because the refrigerating capacity corresponding to the fixed-frequency refrigerating compressor corresponds to the working frequency corresponding to the fixed-frequency refrigerating compressor, the target working frequency of the fixed-frequency refrigerating compressor can be determined according to the refrigerating capacity to be refrigerated, and then the target fixed-frequency refrigerating compressor corresponding to the target working frequency in the plurality of fixed-frequency refrigerating compressors is determined according to the target working frequency, so that the target fixed-frequency refrigerating compressor is started, the surplus of the refrigerating capacity of the fixed-frequency refrigerating compressor is avoided, and the purpose of saving electric power is achieved.

Referring to fig. 6, fig. 6 is a flowchart illustrating a control method applied to an indirect evaporative cooling system according to another exemplary embodiment of the present application. As shown in fig. 6, the method may further include steps S610 to S630 based on the method shown in fig. 5 under the condition that the number of the fixed-frequency refrigeration compressors is plural, and the detailed description is as follows:

in step S610, if the actual supply air temperature reaches the supply air temperature set value, the operation time corresponding to each of the plurality of constant frequency refrigeration compressors is obtained.

The longer the operation duration of the fixed-frequency refrigeration compressor is, the greater the influence on the service life of the fixed-frequency refrigeration compressor is, and the higher the risk of damage to the fixed-frequency refrigeration compressor is.

In the embodiment of the application, when the plurality of fixed-frequency refrigeration compressors are in an operating state, if the actual air supply temperature reaches the air supply temperature set value, the operating time corresponding to each of the plurality of fixed-frequency refrigeration compressors is obtained, so that the damage risk of each fixed-frequency refrigeration compressor is confirmed according to the operating time corresponding to each of the plurality of fixed-frequency refrigeration compressors.

In step S620, a shutdown sequence of the plurality of constant frequency refrigeration compressors is determined according to the operation times of the plurality of constant frequency refrigeration compressors.

In the embodiment of the present application, after the operation time corresponding to each of the plurality of fixed-frequency refrigeration compressors is obtained, the shutdown sequence of the plurality of fixed-frequency refrigeration compressors may be determined according to the operation time of the plurality of fixed-frequency refrigeration compressors.

For example, when the first fixed-frequency refrigeration compressor, the second fixed-frequency refrigeration compressor and the third fixed-frequency refrigeration compressor are all in an operating state, wherein the operating time of the first fixed-frequency refrigeration compressor is 2 hours, the operating time of the second fixed-frequency refrigeration compressor is 3 hours, and the operating time of the third fixed-frequency refrigeration compressor is 1 hour; and if the actual air supply temperature reaches an air supply temperature set value, acquiring the running time of the first fixed-frequency refrigeration compressor, the second fixed-frequency refrigeration compressor and the third fixed-frequency refrigeration compressor respectively, and then arranging the running time lengths corresponding to the fixed-frequency refrigeration compressors from long to short in sequence to obtain the sequence of the second fixed-frequency refrigeration compressor, the first fixed-frequency refrigeration compressor and the third fixed-frequency refrigeration compressor, so that the sequence is used as the shutdown sequence of the first fixed-frequency refrigeration compressor, the second fixed-frequency refrigeration compressor and the third fixed-frequency refrigeration compressor.

In step S630, the plurality of constant frequency refrigeration compressors are controlled to be turned off in the shutdown sequence.

In the embodiment of the application, after the shutdown sequence of the plurality of fixed-frequency refrigeration compressors is determined, the plurality of fixed-frequency refrigeration compressors are controlled to be closed according to the shutdown sequence.

Referring to the above example, the shutdown sequence corresponding to the first fixed-frequency refrigeration compressor, the second fixed-frequency refrigeration compressor, and the third fixed-frequency refrigeration compressor is that the second fixed-frequency refrigeration compressor, the first fixed-frequency refrigeration compressor, and the third fixed-frequency refrigeration compressor are sequentially turned off, and the second fixed-frequency refrigeration compressor with the longest operation time is turned off preferentially, so that the fixed-frequency refrigeration compressor with the overlong continuous operation time can be turned off preferentially, thereby reducing the risk of damage to the fixed-frequency refrigeration compressor operating for a long time, and further prolonging the service life of the fixed-frequency refrigeration compressor.

Referring to FIG. 7, FIG. 7 shows a flow chart of a control method applied to an indirect evaporative cooling system according to another exemplary embodiment of the present application. As shown in fig. 7, the method may further include steps S710 to S720 on the basis of the method shown in fig. 5, and the following details are described as follows:

in step S710, if the operating frequency of the inverter refrigeration compressor reaches the second predetermined operating frequency threshold and the fixed-frequency refrigeration compressor is not started, it is determined whether the actual air supply temperature of the fan module reaches the predetermined air supply temperature setting value.

The second operating frequency threshold represents a minimum allowable operating frequency of the inverter refrigeration compressor, and a specific numerical value of the second operating frequency threshold may be adjusted according to equipment parameters of the inverter refrigeration compressor, which is not limited herein. Accordingly, the second operating frequency threshold is less than the first operating frequency threshold.

In the implementation mode of the application, in the process of cooling the air to be cooled by the cooling module, if the working frequency of the variable-frequency cooling compressor reaches the preset second working frequency threshold value and the fixed-frequency cooling compressor is not started, whether the air supply temperature of the fan module reaches the preset air supply temperature set value or not is judged.

Because the working frequency of the variable-frequency refrigeration compressor is already at the minimum allowable working frequency and the fixed-frequency refrigeration compressor is not in the running state, it indicates that the cooling effect of the gas to be cooled by the current refrigeration module is low, and therefore, in order to save electric power, it is determined whether the actual air supply temperature of the fan module reaches a preset air supply temperature set value, so as to determine whether to completely turn off the variable-frequency refrigeration compressor and the fixed-frequency refrigeration compressor of the refrigeration module.

If a yes judgment is made in step S720, the inverter refrigeration compressor is turned off.

In the embodiment of the application, in the process of judging whether the actual air supply temperature of the fan module reaches the preset air supply temperature set value, if so, the variable-frequency refrigeration compressor is turned off.

For example, in fig. 1, the actual temperature corresponding to the air to be cooled after the temperature reduction process is carried out by the indoor fan is 15 °, that is, the actual supply air temperature is 15 °, if the currently set supply air temperature setting value is 16 °, in the process of determining whether the actual supply air temperature reaches the preset supply air temperature setting value, the actual supply air temperature is lower than the supply air temperature setting value, so as to indicate that the actual supply air temperature meets the requirement of the supply air temperature setting value, and thus, if yes, the variable frequency refrigeration compressor is turned off, so as to save power resources, and prevent the variable frequency refrigeration compressor from being in a working state for a long time.

In another exemplary embodiment, the control method applied to the indirect evaporative cooling system shown in fig. 5 further includes step S810, which is described in detail as follows:

in step S810, after the operating frequency of the variable-frequency refrigeration compressor reaches the first operating frequency threshold and the fixed-frequency refrigeration compressor is started, if the actual supply air temperature is greater than the supply air temperature set value, the spray module of the indirect evaporative cooling system is started.

In the embodiment of this application, the mode of operation of confirming indirect evaporative cooling system is for mixing dry operating mode, when the frequency conversion refrigeration compressor of refrigeration module and the corresponding start-up of frequency-fixed refrigeration compressor, frequency conversion refrigeration compressor's operating frequency reaches first operating frequency threshold value, and start after the frequency-fixed refrigeration compressor, if actual supply air temperature is greater than air supply temperature setting value, it shows that the air of waiting to cool down is after the one-level cooling processing procedure of fan module and the second grade cooling processing procedure of refrigeration module, the air of waiting to cool down still can not satisfy the cooling demand, just need further start the module that sprays of indirect evaporative cooling system and carry out tertiary cooling, in order further to treat the air of cooling and cool down, thereby the cooling capacity of the air of waiting to cool down is treated to maximum guarantee, above-mentioned mode of operation is the wet operating mode of mixing in the indirect evaporative cooling system mode simultaneously. In addition, in the process of determining the working mode of the indirect evaporative cooling system according to the outdoor wet bulb temperature, if the outdoor wet bulb temperature is higher than the preset wet bulb switching temperature, the mixed wet working condition mode can be directly operated.

In the operation process of each working mode of the indirect evaporative cooling system, the operation mode can be switched with each other according to the difference between the actual air supply temperature and the air supply temperature set value and the difference between the actual return air temperature and the return air temperature set value.

The following describes in detail the switching process between the dry mode, the wet mode, the hybrid dry mode and the hybrid wet mode in an exemplary embodiment:

in the dry mode, i.e., the working mode operated when the outdoor dry bulb temperature is lower than the preset dry bulb switching temperature, the corresponding control manner is described in the detailed description of step S310, and is not described herein again.

And after the outdoor fan and the indoor fan corresponding to the fan module are started, adjusting the operating power of the outdoor fan according to the difference value between the actual air supply temperature and the air supply temperature set value. And when the actual air supply temperature does not reach the set air supply temperature value, if the operating power of the outdoor fan reaches a first operating power threshold value. The energy-saving mode of the indirect evaporative cooling system can be determined, and if the energy-saving mode is the water-saving mode, the mode is switched to the mixed dry working condition mode; if the energy-saving mode is the electricity-saving mode, the mode is switched to the wet working condition mode. In addition, the set value of the air supply temperature can be set to be an interval mode, so that the set value of the air supply temperature can be adjusted to the upper limit of the set value of the air supply temperature when the actual air supply temperature does not reach the set value of the air supply temperature before the energy-saving mode of the indirect evaporative cooling system is determined, so that whether the actual air supply temperature reaches the set value of the air supply temperature or not is judged again, and the switching of the working mode caused by the short-time small fluctuation of the actual air supply temperature is avoided. The mode of adjusting the air supply temperature set value can adjust the air supply temperature set value for multiple times according to a preset adjusting value, so that the optimal cooling effect of air to be cooled is ensured.

In addition, in the process of determining that the operating power of the outdoor fan reaches the first operating power threshold, referring to the manner of determining that the operating frequency of the inverter refrigeration compressor reaches the preset first operating frequency threshold in step S520, by presetting the second timing interval and maintaining the operating power of the outdoor fan at the time ratio of the first operating power threshold, it is determined whether the operating power of the outdoor fan reaches the first operating power threshold, so as to avoid switching of the operating modes due to short-time fluctuation of the operating power of the outdoor fan.

In the wet condition mode, that is, the outdoor dry bulb temperature is greater than the preset dry bulb switching temperature, and the outdoor wet bulb temperature is less than the preset wet bulb switching temperature, and the energy saving mode preset by the indirect evaporative cooling system is the operating mode operated when the energy saving mode is the energy saving mode, the control manner corresponding to the operation mode is described in detail in step S320 and step S330 shown in fig. 3, which is not described herein again.

After the spraying module and the fan module are started, the running power of the outdoor fan is adjusted according to the difference value between the actual air supply temperature and the air supply temperature set value. When the actual air supply temperature does not reach the air supply temperature set value, if the operating power of the outdoor fan reaches the first operating power threshold value, the outdoor air after water spraying still cannot meet the cooling requirement for cooling the air to be cooled, and the mode can be switched to a hybrid dry mode or a hybrid wet working condition mode with a higher cooling speed.

In the mixed dry operating mode, that is, the outdoor dry bulb temperature is greater than the preset dry bulb switching temperature, and the outdoor wet bulb temperature is less than the preset wet bulb switching temperature, and the energy-saving mode preset by the indirect evaporative cooling system is the operating mode operated in the water-saving mode, the detailed description of the corresponding control mode is omitted in the above-mentioned embodiment.

After the refrigeration module and the fan module are started, the working frequency of the variable-frequency refrigeration compressor is adjusted and the on-off of the variable-frequency refrigeration compressor is controlled according to the difference value between the actual air supply temperature and the air supply temperature set value. When actual air supply temperature does not reach the air supply temperature set value, if the working frequency of the variable-frequency refrigeration compressor reaches the first working frequency threshold value, and the fixed-frequency refrigeration compressor is in the running state, the requirement of cooling cannot be met after the air to be cooled after being cooled by outdoor air is cooled again through the secondary cooling treatment of the refrigeration module, and the air to be cooled can be further cooled by switching to a mixed wet working condition.

In addition, when the actual air supply temperature reaches the air supply temperature set value, if the working frequency of the variable-frequency refrigeration compressor reaches the second working frequency threshold value and the fixed-frequency refrigeration compressor is in a shutdown state, the variable-frequency refrigeration compressor can be turned off and switched to a dry working condition mode, so that the power resource is saved.

In the mixed wet condition mode, i.e., the working mode that is operated when the outdoor wet bulb temperature is greater than the preset wet bulb switching temperature, the corresponding control manner is described in detail in the step S810, which is not described herein again.

After the spraying module, the refrigerating module and the fan module are all started, the working frequency of the variable-frequency refrigerating compressor is adjusted and the on-off of the variable-frequency refrigerating compressor is controlled according to the difference value between the actual air supply temperature and the air supply temperature set value. When the actual air supply temperature reaches the set value of the air supply temperature, if the working frequency of the variable-frequency refrigeration compressor reaches a second working frequency threshold value and the fixed-frequency refrigeration compressor is in a shutdown state, the energy-saving mode of the indirect evaporative cooling system can be determined, and if the energy-saving mode is a water-saving mode, the dry working mode is switched to; if the energy-saving mode is the electricity-saving mode, the mode is switched to the wet working condition mode.

Embodiments of the apparatus of the present application are described below, which may be used to implement the control method applied to the indirect evaporative cooling system in the above-described embodiments of the present application. For details not disclosed in the embodiments of the apparatus of the present application, please refer to the embodiments of the control method applied to the indirect evaporative cooling system described above.

FIG. 8 shows a block diagram of a control device 900 applied to an indirect evaporative cooling system according to one embodiment of the present application.

Referring to fig. 8, a control device 900 applied to an indirect evaporative cooling system according to an embodiment of the present application includes: an acquisition module 910 configured to acquire an outdoor dry bulb temperature and an outdoor wet bulb temperature; the judging module 920 is configured to determine a working mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature, the outdoor wet bulb temperature and a preset energy saving mode of the indirect evaporative cooling system, where the energy saving mode includes an energy saving mode or a water saving mode; an execution module 930 configured to control the indirect evaporative cooling system to cool down according to the operation mode; the working mode corresponding to the electricity-saving mode is cooled through a spraying module and a fan module in the indirect evaporative cooling system; and the working mode corresponding to the water-saving mode is cooled by a refrigeration compressor in the indirect evaporative cooling system.

In some embodiments of the present application, based on the foregoing solution, the determining module 920 is further configured to: if the outdoor dry bulb temperature is greater than the preset dry bulb switching temperature, the outdoor wet bulb temperature is less than the preset wet bulb switching temperature, and the energy-saving mode preset by the indirect evaporative cooling system is the power-saving mode, determining that the working mode of the indirect evaporative cooling system is the wet working condition mode; the execution module 930 is further configured to: starting a spraying module of the indirect evaporative cooling system, and starting a fan module of the indirect evaporative cooling system according to a preset air supply temperature set value and a preset return air temperature set value; and adjusting the operating power of the fan module according to the difference between the actual air supply temperature and the air supply temperature set value of the fan module and the difference between the actual return air temperature and the return air temperature set value of the fan module.

In some embodiments of the present application, based on the foregoing solution, the determining module 920 is further configured to: if the outdoor dry bulb temperature is higher than the preset dry bulb switching temperature, the outdoor wet bulb temperature is lower than the preset wet bulb switching temperature, and the energy-saving mode preset by the indirect evaporative cooling system is a water-saving mode, determining that the working mode of the indirect evaporative cooling system is a mixed dry working condition mode; the execution module 930 is further configured to: and starting a fan module of the indirect evaporative cooling system according to a preset first operating power threshold value, and starting a refrigeration module of the indirect evaporative cooling system, wherein the refrigeration module comprises at least one refrigeration compressor.

In some embodiments of the present application, based on the foregoing solution, the execution module 930 is further configured to: under the condition that the refrigeration module comprises a variable-frequency refrigeration compressor and a fixed-frequency refrigeration compressor; starting the variable-frequency refrigeration compressor, and adjusting the working frequency of the variable-frequency refrigeration compressor according to the difference between the actual air supply temperature and the air supply temperature set value of the fan module and the difference between the actual air return temperature and the air return temperature set value of the fan module; and if the working frequency of the variable-frequency refrigeration compressor reaches a preset first working frequency threshold value and the actual air supply temperature is greater than an air supply temperature set value, starting the fixed-frequency refrigeration compressor.

In some embodiments of the present application, based on the foregoing solution, the control device 900 applied to the indirect evaporative cooling system further includes: a shutdown module configured to: under the condition that the number of the fixed-frequency refrigeration compressors is multiple, if the actual air supply temperature reaches an air supply temperature set value, acquiring the respective corresponding operation time of the multiple fixed-frequency refrigeration compressors; determining the shutdown sequence of the plurality of fixed-frequency refrigeration compressors according to the running time of the plurality of fixed-frequency refrigeration compressors; and controlling to close the plurality of fixed-frequency refrigeration compressors according to the shutdown sequence.

In some embodiments of the present application, based on the foregoing, the shutdown module is further configured to: if the working frequency of the variable-frequency refrigeration compressor reaches a preset second working frequency threshold value and the fixed-frequency refrigeration compressor is not started, judging whether the air supply temperature of the fan module reaches a preset air supply temperature set value or not; wherein the second operating frequency threshold is less than the first operating frequency threshold; if the judgment result is yes, the variable-frequency refrigeration compressor is closed.

In some embodiments of the present application, based on the foregoing solution, the control device 900 applied to the indirect evaporative cooling system further includes: a start module configured to: and after the working frequency of the variable-frequency refrigeration compressor reaches a first working frequency threshold value and the fixed-frequency refrigeration compressor is started, if the actual air supply temperature is greater than the air supply temperature set value, starting a spraying module of the indirect evaporative cooling system.

In some embodiments of the present application, based on the foregoing solution, the control device 900 applied to the indirect evaporative cooling system further includes: a timing module configured to: starting timing after the working frequency of the variable-frequency refrigeration compressor reaches a first working frequency threshold value; acquiring the time length of the working frequency kept as a first working frequency threshold, and judging whether the time ratio of the time length in a preset first timing interval reaches a preset ratio value or not; if the judgment result is yes, the working frequency of the variable-frequency refrigeration compressor is determined to reach a first working frequency threshold value.

It should be noted that the control device 900 applied to the indirect evaporative cooling system provided in the above embodiment belongs to the same concept as the control method applied to the indirect evaporative cooling system provided in the above embodiment, wherein the specific manner in which each module and unit performs the operation has been described in detail in the method embodiment, and is not described again here.

Embodiments of the present application further provide an electronic device comprising a processor and a memory, wherein the memory has stored thereon computer readable instructions, which when executed by the processor, implement the control method applied to an indirect evaporative cooling system as described above.

FIG. 9 illustrates a schematic structural diagram of a computer system suitable for use in implementing the electronic device of an embodiment of the present application.

It should be noted that the computer system 1000 of the electronic device shown in fig. 9 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.

As shown in fig. 9, the computer system 1000 includes a Central Processing Unit (CPU) 1001 that can perform various appropriate actions and processes, such as performing the methods described in the above embodiments, according to a program stored in a Read-Only Memory (ROM) 1002 or a program loaded from a storage portion 1008 into a Random Access Memory (RAM) 1003. In the RAM 1003, various programs and data necessary for system operation are also stored. The CPU 1001, ROM 1002, and RAM 1003 are connected to each other via a bus 1004. An Input/Output (I/O) interface 1005 is also connected to the bus 1004.

The following components are connected to the I/O interface 1005: an input section 1006 including a keyboard, a mouse, and the like; an output section 1007 including a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and a speaker; a storage portion 1008 including a hard disk and the like; and a communication section 1009 including a Network interface card such as a LAN (Local Area Network) card, a modem, or the like. The communication section 1009 performs communication processing via a network such as the internet. A drive 1010 is also connected to the I/O interface 1005 as necessary. A removable medium 1011 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 1010 as necessary, so that a computer program read out therefrom is mounted into the storage section 1008 as necessary.

In particular, according to embodiments of the present application, the processes described above with reference to the flow diagrams may be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising a computer program for performing the method illustrated by the flow chart. In such an embodiment, the computer program may be downloaded and installed from a network through the communication part 1009 and/or installed from the removable medium 1011. When the computer program is executed by a Central Processing Unit (CPU) 1001, various functions defined in the system of the present application are executed.

It should be noted that the computer readable medium shown in the embodiments of the present application may be a computer readable signal medium or a computer readable storage medium or any combination of the two. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples of the computer readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), an Erasable Programmable Read-Only Memory (EPROM), a flash Memory, an optical fiber, a portable Compact Disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. In this application, however, a computer readable signal medium may include a propagated data signal with a computer program embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present application. Each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The units described in the embodiments of the present application may be implemented by software or hardware, and the described units may also be disposed in a processor. Wherein the names of the elements do not in some way constitute a limitation on the elements themselves.

As another aspect, the present application also provides a computer-readable storage medium, which may be included in the electronic device described in the above embodiments; or may exist separately without being assembled into the electronic device. The computer-readable storage medium carries one or more programs which, when executed by an electronic device, cause the electronic device to implement the method described in the above embodiments.

It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functions of two or more modules or units described above may be embodied in one module or unit according to embodiments of the application. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.

Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, and may also be implemented by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which can be a personal computer, a server, a touch terminal, or a network device, etc.) to execute the method according to the embodiments of the present application.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.

It will be understood that the present application is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A control method for an indirect evaporative cooling system, the method comprising:

collecting outdoor dry bulb temperature and outdoor wet bulb temperature;

determining the working mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature, the outdoor wet bulb temperature and the preset energy-saving mode of the indirect evaporative cooling system, wherein the energy-saving mode comprises an energy-saving mode or a water-saving mode;

controlling the indirect evaporative cooling system to cool according to the working mode; the working mode corresponding to the electricity-saving mode is cooled through a spraying module and a fan module in the indirect evaporative cooling system; and the working mode corresponding to the water-saving mode is cooled by a refrigeration compressor in the indirect evaporative cooling system.

2. The method according to claim 1, wherein the determining the operation mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature and the outdoor wet bulb temperature and the preset energy saving mode of the indirect evaporative cooling system comprises:

if the outdoor dry bulb temperature is greater than the preset dry bulb switching temperature, the outdoor wet bulb temperature is less than the preset wet bulb switching temperature, and the preset energy-saving mode of the indirect evaporative cooling system is the power-saving mode, determining that the working mode of the indirect evaporative cooling system is the wet working condition mode;

the controlling the indirect evaporative cooling system to cool according to the working mode comprises:

starting a spraying module of the indirect evaporative cooling system, and starting a fan module of the indirect evaporative cooling system according to a preset air supply temperature set value and a preset return air temperature set value;

and adjusting the operating power of the fan module according to the difference between the actual air supply temperature of the fan module and the air supply temperature set value and the difference between the actual return air temperature of the fan module and the return air temperature set value.

3. The method according to claim 1, wherein the determining the operation mode of the indirect evaporative cooling system according to the outdoor dry bulb temperature and the outdoor wet bulb temperature and the preset energy saving mode of the indirect evaporative cooling system comprises:

if the outdoor dry bulb temperature is higher than the preset dry bulb switching temperature, the outdoor wet bulb temperature is lower than the preset wet bulb switching temperature, and the energy-saving mode preset by the indirect evaporative cooling system is a water-saving mode, determining that the working mode of the indirect evaporative cooling system is a mixed dry working condition mode;

and starting a fan module of the indirect evaporative cooling system according to a preset first operating power threshold value, and starting a refrigerating module of the indirect evaporative cooling system, wherein the refrigerating module comprises at least one refrigerating compressor.

4. The method of claim 3, wherein the refrigeration module comprises an inverter refrigeration compressor and a fixed frequency refrigeration compressor; the refrigeration module for starting the indirect evaporative cooling system comprises:

starting the variable-frequency refrigeration compressor, and adjusting the working frequency of the variable-frequency refrigeration compressor according to the difference between the actual air supply temperature of the fan module and the air supply temperature set value and the difference between the actual return air temperature of the fan module and the return air temperature set value;

and if the working frequency of the variable-frequency refrigeration compressor reaches a preset first working frequency threshold value and the actual air supply temperature is greater than the air supply temperature set value, starting the fixed-frequency refrigeration compressor.

5. The method of claim 4, wherein the number of fixed frequency refrigerant compressors is plural; the method further comprises the following steps:

if the actual air supply temperature reaches the set air supply temperature value, acquiring the respective corresponding operation time of the plurality of fixed-frequency refrigeration compressors;

determining a shutdown sequence of the plurality of constant frequency refrigeration compressors according to the running time of the plurality of constant frequency refrigeration compressors;

and controlling to close the plurality of fixed-frequency refrigeration compressors according to the shutdown sequence.

6. The method of claim 4, further comprising:

if the working frequency of the variable-frequency refrigeration compressor reaches a preset second working frequency threshold value and the fixed-frequency refrigeration compressor is not started, judging whether the air supply temperature of the fan module reaches a preset air supply temperature set value or not; wherein the second operating frequency threshold is less than the first operating frequency threshold;

if the judgment result is yes, the variable-frequency refrigeration compressor is closed.

7. The method of claim 4, further comprising:

and after the working frequency of the variable-frequency refrigeration compressor reaches the first working frequency threshold value and the fixed-frequency refrigeration compressor is started, if the actual air supply temperature is higher than the air supply temperature set value, starting a spraying module of the indirect evaporative cooling system.

8. The method of claim 4, further comprising:

starting timing after the working frequency of the variable-frequency refrigeration compressor reaches the first working frequency threshold value;

acquiring the time length of the working frequency kept as the first working frequency threshold, and judging whether the time ratio of the time length in a preset first timing interval reaches a preset ratio value or not;

if the frequency conversion refrigerating compressor is judged to be the first working frequency threshold, the working frequency of the frequency conversion refrigerating compressor is determined to reach the first working frequency threshold.

9. An indirect evaporative cooling system, comprising:

the sensor assembly is used for acquiring outdoor dry bulb humidity and outdoor wet bulb temperature;

a controller electrically connected to the sensor assembly for reading pre-stored computer readable instructions to perform the control method of any one of claims 1-8 applied to an indirect evaporative cooling system.

10. The system of claim 9, further comprising:

the fan module is used for conveying air;

the spraying module is used for spraying liquid to cool;

the refrigeration module is used for changing the temperature of air and comprises a variable-frequency refrigeration compressor and a fixed-frequency refrigeration compressor;

the fan module, the spraying module and the refrigerating module are respectively electrically connected with the controller, so that the fan module, the spraying module and the refrigerating module are controlled by the controller to cool the indirect evaporative cooling system.