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CN108592331B - Cooling tower cold supply mode control method and system of air conditioning system - Google Patents

Cooling tower cold supply mode control method and system of air conditioning system Download PDF

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Publication number
CN108592331B
CN108592331B CN201810444501.7A CN201810444501A CN108592331B CN 108592331 B CN108592331 B CN 108592331B CN 201810444501 A CN201810444501 A CN 201810444501A CN 108592331 B CN108592331 B CN 108592331B
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cooling
air conditioning
conditioning system
temperature
cooling tower
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CN108592331A (en
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薛雪
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Shenzhen Das Intellitech Co Ltd
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Shenzhen Das Intellitech Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/54—Free-cooling systems

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

The invention relates to a method and a system for controlling a cooling mode of a cooling tower of an air conditioning system, which comprises the following steps: s1, judging whether the air conditioning system is in a free cooling mode of the cooling tower; s2, if not, acquiring real-time dew point temperature of outdoor air and indoor dry bulb temperature set values through a sensor; and S3, comparing the real-time dew point temperature with the indoor dry bulb temperature set value according to preset conditions, and controlling the cooling mode of the air conditioning system according to the comparison result. The invention can make simple and effective free cold supply mode switching aiming at different configured central air-conditioning systems and working conditions, can realize real-time comparison between the free water supply temperature of the cooling tower and the set value of the indoor dry bulb temperature, and finally realizes the purposes of energy conservation and optimal comprehensive energy efficiency of the cooling water system.

Description

Cooling tower cold supply mode control method and system of air conditioning system
Technical Field
The invention relates to the field of large-scale central air conditioners in buildings, in particular to a method and a system for controlling a cooling tower cooling mode of an air conditioning system.
Background
In China, the total energy consumption of buildings in 2014 exceeds 12.5 hundred million tons of standard coal, and accounts for 30 percent of the total social energy consumption. The energy consumption of the central air conditioner accounts for 65% of the total energy consumption of the building, wherein the energy consumption of the air conditioner room accounts for about 70% of the energy consumption of the air conditioning system. Therefore, it is necessary to monitor and control the energy efficiency level of the main equipment of the central air-conditioning system room, especially the refrigeration host machine, in real time to save energy for the operation of the central air-conditioning system.
The free cooling technology for cooling tower is one effective method of lowering air conditioning power consumption, and the free cooling technology makes full use of natural cold source, and in transitional season and winter, the outdoor air has wet bulb temperature lower than some temperature value, and the refrigerating unit is shut down to provide cooling capacity to the air conditioning system directly or indirectly with cooling water to reach the aim of saving air conditioning power consumption. The free cooling technology of the cooling tower can reduce the starting time of the refrigerating unit, saves the operating cost of the unit, and is suitable for buildings needing annual cooling or having annual cooling inner areas, such as large office building inner areas, computer rooms, large markets and other places.
The traditional free cooling control method for the cooling tower usually analyzes based on technical performance and economical efficiency according to different central air-conditioning system types and different working conditions, is time-consuming and complex in calculation, and control strategies made for specific projects are not universal and portable, so that a set of simple and effective starting and stopping method cannot be organized.
Disclosure of Invention
The present invention provides a method and a system for controlling a cooling mode of a cooling tower of an air conditioning system, aiming at the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a cooling tower cooling mode control method for constructing an air conditioning system comprises the following steps:
s1, judging whether the air conditioning system is in a free cooling mode of the cooling tower;
s2, if not, acquiring the real-time dew point temperature of the outdoor air through a sensor;
and S3, performing operation processing on the real-time dew point temperature and the indoor dry bulb temperature set value, and controlling the cooling mode of the air conditioning system according to the operation processing result.
Preferably, the step S3 includes:
and S3-0, adding the real-time dew point temperature and a preset temperature rise to obtain a comparative temperature.
Preferably, the step S3 further includes:
s31, comparing the comparison temperature with the indoor dry bulb temperature set value, and judging whether the comparison temperature is smaller than the indoor dry bulb temperature set value;
s32, if the comparison temperature is smaller than the indoor dry bulb temperature set value, repeatedly executing the step S2, the step S3-0 and the step S31 at preset time intervals until reaching a preset time period, and then executing the step S33;
s33, judging whether the comparison temperature obtained in the step S32 at each moment is smaller than the corresponding indoor dry bulb temperature set value or not;
s34, if yes, controlling the air conditioning system to switch to a free cooling mode of the cooling tower; if not, maintaining the current cooling mode of the air conditioning system.
Preferably, the method further comprises:
if the air conditioning system is in a free cooling mode of the cooling tower, executing the following steps:
a1, acquiring current state information of a cooling tower and energy consumption information of a delivery pump corresponding to the cooling tower;
a2, performing operation processing on the current state information and the energy consumption information to obtain the power consumption and cold consumption ratio of the delivery pump;
and A3, judging whether the power consumption and cooling output ratio of the conveying pump meets a preset switching condition, and if not, executing a switching action.
Preferably, the preset switching condition includes that the power consumption cold transmission ratio of the delivery pump is greater than a threshold value or the power consumption cold transmission ratio of the delivery pump is less than or equal to the threshold value and is kept for a preset time period;
the step A3 includes:
a31, judging whether the power consumption and cooling delivery ratio of the delivery pump is greater than a threshold value;
a32, if yes, maintaining the air conditioning system as a free cooling mode of the cooling tower;
and A33, if not, judging whether the power consumption and cooling output ratio of the delivery pump is less than or equal to a threshold value in a preset time period, and if so, executing a switching action.
The present invention also provides a cooling tower cooling mode control system of an air conditioning system, comprising:
the judging unit is used for judging whether the air conditioning system is in a free cooling mode of the cooling tower;
the collecting unit is used for collecting the real-time dew point temperature of outdoor air through a sensor when the air conditioning system is in a non-cooling tower free cooling mode;
and the control unit is used for performing operation processing on the real-time dew point temperature and the indoor dry bulb temperature set value and controlling the cooling mode of the air conditioning system according to an operation processing result.
Preferably, the control unit includes:
and the calculation module is used for adding the real-time dew point temperature and the preset temperature rise to obtain a comparison temperature.
Preferably, the control unit further comprises:
the comparison and judgment module is used for comparing the comparison temperature with the indoor dry bulb temperature set value and judging whether the comparison temperature is smaller than the indoor dry bulb temperature set value or not;
the repeated execution module is used for sequentially controlling the acquisition unit and the execution and comparison judgment module to be repeatedly executed at preset time intervals until a preset time period is reached when the comparison temperature is less than the set indoor dry bulb temperature value;
the first judgment module is used for judging whether the comparison temperature at each moment obtained in the repeated execution module is smaller than the corresponding indoor dry bulb temperature set value or not;
and the control module is used for controlling the air conditioning system to be switched to a free cooling mode of the cooling tower when the comparison temperature obtained in the repeated execution module at each moment is less than the corresponding indoor dry bulb temperature set value, and otherwise, maintaining the current cooling mode of the air conditioning system.
Preferably, the method further comprises the following steps:
the second acquisition unit is used for acquiring the current state information of the cooling tower and the energy consumption information of the delivery pump corresponding to the cooling tower when the air conditioning system is in a free cooling mode of the cooling tower;
the operation processing unit is used for performing operation processing on the current state information and the energy consumption information to obtain the power consumption and cold consumption ratio of the conveying pump;
and the judging and executing unit is used for judging whether the power consumption and cooling transmission ratio of the conveying pump meets a preset switching condition or not, and if not, executing a switching action.
Preferably, the preset switching condition includes that the power consumption cold transmission ratio of the delivery pump is greater than a threshold value or the power consumption cold transmission ratio of the delivery pump is less than or equal to a preset time period;
the judgment execution unit includes:
the second judgment module is used for judging whether the power consumption and cooling transmission ratio of the conveying pump is greater than a threshold value;
the execution module is used for maintaining the air conditioning system in a free cooling mode of the cooling tower when the power consumption and cooling transmission ratio of the delivery pump is smaller than a threshold value;
and the third judging module is used for judging whether the power consumption cold transmission ratio of the conveying pump is smaller than or equal to a threshold value in a preset time period or not when the power consumption cold transmission ratio of the conveying pump is smaller than the threshold value, and if so, executing switching action.
The implementation of the cooling tower cooling mode control method of the air conditioning system has the following beneficial effects: the invention can make simple and effective free cold supply mode switching aiming at different configured central air-conditioning systems and working conditions, and can realize the purpose of energy saving and optimal comprehensive energy efficiency of the cooling water system by acquiring the dew point temperature of the outdoor air in real time, comparing the dew point temperature of the outdoor air with the set value of the indoor dry bulb temperature according to the preset condition, determining the cold supply mode of the air-conditioning system according to the comparison result, and simultaneously judging whether the free cold supply mode of the cooling tower is started or not by judging the cold quantity conveying energy index of the corresponding conveying pump for free cold supply of the cooling water, thereby realizing the real-time comparison of the free water supply temperature of the cooling tower and the set value of the indoor dry bulb temperature.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic flow chart illustrating a cooling tower cooling mode control method of an air conditioning system according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a cooling tower cooling mode control method according to a second embodiment of the present invention;
FIG. 3 is a functional block diagram of a cooling tower cooling mode control system of the air conditioning system of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
The control method can make simple and effective free cold supply mode switching aiming at central air-conditioning systems with different configurations and working conditions, can realize real-time comparison of free water supply temperature of the cooling tower and a set value of indoor dry bulb temperature, and finally realizes the purposes of energy conservation and comprehensive optimization of a cooling water system.
Referring to fig. 1, fig. 1 is a schematic flow chart of a cooling tower cooling mode control method of an air conditioning system according to a first embodiment of the present invention.
The cooling tower cooling mode control method of the embodiment may implement a control function through a BAS (Building automation System) or an IBMS (Intelligent Building Management System).
As shown in fig. 1, the cooling tower cooling mode control method of this embodiment may include step S1, step S2, and step S3.
And step S1, judging whether the air conditioning system is in a free cooling mode of the cooling tower.
It is understood that the judgment of the cooling mode of the air conditioning system may be based on the operation state of the air conditioning system. Namely, when the air conditioning system is in an opening state, the initial setting mode of the air conditioning system can be directly obtained, and the cooling mode of the air conditioning system is determined according to the initial setting mode. If the air conditioning system is in a normal operation state, the judgment can be carried out through the operation state of a refrigerating unit in the air conditioning system, whether the refrigerating unit of the air conditioning system is closed is taken as a judgment basis, if the refrigerating unit is in a closed state, the air conditioning system is in a free cooling mode of the cooling tower, otherwise, the air conditioning system is in a conventional cooling mode.
And step S2, if not, acquiring the real-time dew point temperature of the outdoor air through a sensor.
If it can be determined in step S1 that the air conditioning system is in the conventional cooling mode, i.e., the non-cooling tower free cooling mode, the real-time dew point temperature and indoor dry bulb temperature setting values of the outdoor air are collected by the sensors.
It can be understood that the real-time dew point temperature of the outdoor air is the real-time dew point temperature of the outdoor air at any one time when the air conditioning system is in the conventional cooling mode. The real-time dew point temperature of the outdoor air can be acquired by a dew point temperature sensor.
Further, an indoor dry bulb temperature set value is obtained at the same time, the indoor dry bulb temperature is an indoor dry bulb temperature set value corresponding to the real-time dew point temperature at the same time, and the indoor dry bulb temperature set value is an air dry bulb temperature at the tail end of the air conditioner. Wherein, the indoor dry bulb temperature set value can be a preset temperature.
And step S3, performing operation processing on the real-time dew point temperature and the indoor dry bulb temperature set value, and controlling the cooling mode of the air conditioning system according to the operation processing result.
Alternatively, step S3 includes step S3-0.
And step S3-0, adding the real-time dew point temperature and the preset temperature rise to obtain a comparative temperature.
Here, the comparative temperature is the cooling tower water supply temperature. The preset temperature rise comprises a conversion temperature and a heat exchange temperature difference, wherein the conversion temperature is 5 ℃; and the heat exchange temperature difference is determined according to the operation condition of field equipment and the characteristics of products. Generally, for a conventional air conditioning system, the temperature loss of a plate heat exchanger is generally 1 degree centigrade, the heat loss of a conveying pipeline is 1 degree centigrade, and the heat loss of an air conditioner terminal surface cooler is 1 degree centigrade. At this time, the preset temperature rise is 8 ℃. It can be understood that, because the hardware adopted by different air conditioning systems is different according to actual requirements, the heat exchange temperature difference is not fixed, so the preset temperature rise of the invention is not limited to 8 ℃, and can be adjusted and set according to actual products.
Further, step S3 may further include:
and step S31, comparing the comparison temperature with the indoor dry bulb temperature set value, and judging whether the comparison temperature is less than the indoor dry bulb temperature set value.
And S32, if the comparison temperature is less than the indoor dry bulb temperature set value, repeatedly executing the steps S2, S3-0 and S31 at preset time intervals until reaching a preset time period, and then executing the step S33.
And step S33, determining whether the comparison temperature obtained in step S32 at each moment is less than the corresponding indoor dry bulb temperature setting value.
Step S34, if yes, the air conditioning system is controlled to be switched to a free cooling mode of the cooling tower; if not, the current cooling mode of the air conditioning system is maintained.
Alternatively, the preset time interval may be 30 seconds, 1 minute, etc., and the present invention is not particularly limited. The preset time period can be 5-10 minutes.
Optionally, the current cooling mode is a normal cooling mode of the central air conditioner.
In one embodiment, the air conditioning system is in a conventional cooling mode in which the real-time dew point temperature of the outdoor air is collected at any one time, assuming the real-time dew point temperature T of the outdoor air collected at the kth timek dewThe corresponding indoor dry bulb temperature set value at the moment is TdryThe preset time interval is 1 minute, the preset time period is 5 minutes, and the preset temperature rise is 8 ℃. Obtaining the real-time dew point temperature T of the outdoor air at the k-th momentk dewThen, the real-time dew point temperature T is measuredk dewAdding the temperature T with the preset temperature rise to obtain the comparative temperature T at the kth momentkComparing the temperature TkAnd the indoor dry bulb temperature set value TdryComparing the temperature T with the reference temperature TkWhether the temperature is less than the indoor dry bulb temperature set value Tdry(ii) a If yes, at the moment k +1, continuously acquiring the real-time dew point temperature T of the outdoor air at the moment k +1k+1 dewThe real-time dew point temperature T is calculatedk+1 dewAdding the temperature to a preset temperature rise to obtain a comparison temperature T at the k +1 th momentk+1Comparing the temperature Tk+1And the indoor dry bulb temperature set value TdryComparing the temperature T with the reference temperature Tk+1Whether the temperature is less than the indoor dry bulb temperature set value Tdry(ii) a If yes, continuously acquiring the real-time dew point temperature T of the outdoor air at the k +2 th momentk+2 dewThe real-time dew point temperature T is calculatedk+2 dewAdding the preset temperature rise to obtain the ratio of the k +2 th momentRelatively high temperature Tk+2And then comparing and judging, and so on, performing data acquisition, data conversion and data comparison actions circularly at preset time intervals until reaching 5 minutes, namely determining if the comparison temperature obtained at all acquisition moments within 5 minutes is less than the indoor dry bulb temperature set value, wherein at the moment, the air-conditioning system can adopt a free cooling mode of a cooling tower, and simultaneously, a control signal is output to control the air-conditioning system to automatically switch to the free cooling mode of the cooling tower, so that the energy consumption is effectively saved.
Further, if at the k-th time, the temperatures T are comparedkIs more than or equal to the indoor dry bulb temperature set value TdryThe current cooling mode of the air conditioning system is maintained. Alternatively, if at the k-th time, the temperatures T are comparedkLess than indoor dry bulb temperature set value TdryAnd at the k +1 th time, the temperature T is comparedk+1Is more than or equal to the indoor dry bulb temperature set value TdryThe current cooling mode of the air conditioning system is maintained. Alternatively, the temperature T is compared between the k-th time and the k + 1-th timekAnd Tk+1Are all less than the indoor dry bulb temperature set value TdryAnd at the k +2 th time, the temperature T is comparedk+2Is more than or equal to the indoor dry bulb temperature set value TdryThe current cooling mode of the air conditioning system is maintained. Alternatively, the temperature T is compared at the k-th time, the k + 1-th time and the k + 2-th timek、Tk+1And Tk+2Are all less than the indoor dry bulb temperature set value TdryAnd at the k +3 th time, the temperature T is comparedk+3Is more than or equal to the indoor dry bulb temperature set value TdryThe current cooling mode of the air conditioning system is maintained. Alternatively, the temperature T is compared at the k-th time, the k + 1-th time, the k + 2-th time and the k + 3-th timek、Tk+1、Tk+2And Tk+3Are all less than the indoor dry bulb temperature set value TdryAnd at the k +4 th time, the temperature T is comparedk+4Is more than or equal to the indoor dry bulb temperature set value TdryThe current cooling mode of the air conditioning system is maintained. Alternatively, the temperature T is compared at the k-th time, the k + 1-th time, the k + 2-th time, the k + 3-th time and the k + 4-th timek、Tk+1、Tk+2、Tk+3And Tk+4Are all less than the indoor dry bulb temperature set value TdryAnd at the k +5 th time, the temperature T is comparedk+5Is more than or equal to the indoor dry bulb temperature set value TdryThe current cooling mode of the air conditioning system is maintained.
When the air conditioning system is in the traditional cooling mode, the real-time dew point temperature of the outdoor air is collected and converted into the cooling water supply temperature of the cooling tower, and then the relation between the cooling water supply temperature of the cooling tower and the size of the indoor dry bulb is judged, so that whether the air conditioning system can be switched to the free cooling mode of the cooling tower is quickly determined according to the comparison result, the data operation is simple, the judgment efficiency is high, the universality is strong, the transportability is realized, and the method and the device can be applied to the conventional large central air conditioning system.
Referring to fig. 2, fig. 2 is a schematic diagram of a cooling tower cooling mode control method according to a second embodiment of the present invention.
If the air conditioning system is in a free cooling mode of the cooling tower, the following steps are executed:
and A1, acquiring the current state information of the cooling tower and the energy consumption information of the delivery pump corresponding to the cooling tower.
Step A1-0 is further included before step A1, and it is determined whether the air conditioning system is in a free cooling mode of the cooling tower.
The current state information of the optional cooling tower is the current state information of the cooling tower at any moment, and can include the water supply temperature, the water return temperature and the circulating flow of cooling water of the cooling tower.
And A2, performing operation processing on the current state information and the energy consumption information to obtain the power consumption and cooling transmission ratio of the delivery pump.
And after the current state information of the cooling tower and the energy consumption information of the corresponding delivery pump at any moment are obtained, obtaining the power consumption and cooling transmission ratio of the delivery pump corresponding to the cooling tower at the moment according to a calculation formula of the power consumption and cooling transmission ratio of the delivery pump.
The calculation formula of the power consumption and cooling transmission ratio of the delivery pump is as follows:
Figure BDA0001656807960000081
wherein, CwaterDenotes the specific heat capacity of cooling water, Mwaterindicates the circulating flow rate, DeltaT, of the cooling waterwaterWhich indicates the temperature difference between the supply water temperature and the return water temperature of the cooling water.
And A3, judging whether the power consumption and cooling output ratio of the conveying pump meets a preset switching condition, and if not, executing a switching action.
Optionally, the preset switching condition includes that the power consumption cold transmission ratio of the delivery pump is greater than a threshold value or the power consumption cold transmission ratio of the delivery pump is less than or equal to the threshold value and is kept for a preset time period;
specifically, step A3 may include step a31 and step a 32.
A31, judging whether the power consumption and cooling transmission ratio of the conveying pump is greater than a threshold value;
and step A32, if yes, maintaining the air conditioning system as a free cooling mode of the cooling tower.
And step A33, if not, judging whether the power consumption and cooling output ratio of the delivery pump is less than or equal to a threshold value in a preset time period, and if so, executing a switching action.
Optionally, the preset time period is 5-10 minutes.
And if the obtained power consumption and cooling rate of the delivery pump is less than or equal to the threshold value at any one moment, repeatedly executing the step A1, the step A2 and the step A31 at preset time intervals until reaching a preset time period, and then executing the step A33.
Alternatively, in this embodiment, the preset time interval may be 30 seconds, 1 minute, or the like, and the present invention is not particularly limited. The preset time period can be 5-10 minutes.
In a specific embodiment, the air conditioning system is in a free cooling mode of the cooling tower, and the water supply temperature, the water return temperature, the circulating flow rate of the cooling water and the energy consumption of a delivery pump corresponding to the cooling tower are collected at any one time in the free cooling mode of the cooling tower.
Suppose the supply water temperature of the cooling tower collected at the k-th time is Tk supReturn water temperature of Tk rtnWith a circulation flow of Mk waterWith an energy consumption of Pkand the temperature difference of the supply water and the return water of the cooling tower at the kth moment is △ Tk water(ii) a The preset time interval is 1 minute, the preset time period is 5 minutes, and the threshold value is 5. The supplied water temperature at the k-th time is obtained as Tk supReturn water temperature of Tk rtnWith a circulation flow of Mk waterWith an energy consumption of Pkand the temperature difference of the supply water and the return water of the cooling tower at the kth moment is △ Tk waterAnd then, calculating the power consumption cold transmission ratio ECR (k) of the delivery pump at the k moment according to a power consumption cold transmission ratio formula of the delivery pump, judging whether the power consumption cold transmission ratio ECR (k) of the delivery pump at the k moment is more than 5, and if so, maintaining the air conditioning system in a free cooling mode of the cooling tower. If the electricity consumption and cooling transmission ratio ECR (k) of the delivery pump at the k-th moment is less than or equal to 5, continuing to acquire the water supply temperature T of the cooling tower cooling water at the k + 1-th momentk+1 supReturn water temperature of Tk+1 rtnWith a circulation flow of Mk+1 waterWith an energy consumption of Pk+1obtaining the temperature difference of supply and return water of the cooling tower at the k +1 th moment as △ Tk+1 waterCalculating the power consumption and cooling transmission ratio ECR (k +1) of the delivery pump at the (k +1) th moment, and then judging whether the power consumption and cooling transmission ratio ECR (k +1) of the delivery pump at the (k +1) th moment is less than or equal to 5; if yes, at the time of k +2, continuously collecting the water supply temperature T of the cooling water of the cooling tower at the time of k +2k+2 supReturn water temperature of Tk+2 rtnWith a circulation flow of Mk+2 waterWith an energy consumption of Pk+2obtaining the temperature difference of supply and return water of the cooling tower at the k +2 th moment as △ Tk+2 waterCalculating the power consumption and cooling transmission ratio ECR (k +2) of the delivery pump at the k +2 moment, and then judging whether the power consumption and cooling transmission ratio ECR (k +2) of the delivery pump at the k +2 moment is less than or equal to 5; if yes, at the time of k +3, continuously collecting the water supply temperature T of the cooling water of the cooling tower at the time of k +3k+3 supReturn water temperature of Tk+3 rtnWith a circulation flow of Mk+3 waterWith an energy consumption of Pk+3Obtaining cooling at the k +3 th timethe temperature difference between the water supply and the water return of the tower is △ Tk+3 waterCalculating the power consumption and cooling transmission ratio ECR (k +3) of the delivery pump at the k +3 th moment, and then judging whether the power consumption and cooling transmission ratio ECR (k +3) of the delivery pump at the k +3 th moment is less than or equal to 5; if yes, continuing to acquire the water supply temperature T of the cooling water of the cooling tower at the k +4 th momentk+4 supReturn water temperature of Tk+4 rtnWith a circulation flow of Mk+4 waterWith an energy consumption of Pk+4And then data processing is carried out, the data processing is compared with a threshold value until 5 minutes is reached, namely if the power consumption and cooling output ratio of the delivery pump at all the acquisition moments in 5 minutes is less than or equal to 5, a switching action is carried out, namely the free cooling mode of the cooling tower of the air conditioning system is switched to the conventional cooling mode.
Further, if the electricity consumption and cooling transmission ratio ECR (k) of the delivery pump is more than 5 at the k-th moment, the air conditioning system is maintained to be in a free cooling mode of the cooling tower. Or, if the power consumption cold output ratio ECR (k) of the delivery pump is larger than 5 at the k-th time and the power consumption cold output ratio ECR (k +1) of the delivery pump is smaller than or equal to 5 at the k + 1-th time, the air conditioning system is maintained to be in the free cold supply mode of the cooling tower. Or, if the power consumption and cooling transmission ratio ECR (k) and ECR (k +1) of the delivery pump at the k-th time and the k +1 time are both larger than 5, and the power consumption and cooling transmission ratio ECR (k +2) of the delivery pump at the k +2 time is smaller than or equal to 5, the air conditioning system is maintained in the free cooling mode of the cooling tower. Or, if the power consumption cold output ratio ECR (k), ECR (k +1) and ECR (k +2) of the delivery pump is greater than 5 at the k th time, the k +1 th time and the k +2 th time, and the power consumption cold output ratio ECR (k +3) of the delivery pump is less than or equal to 5 at the k +3 th time, the air conditioning system is maintained in the free cold supply mode of the cooling tower. Or, if the power consumption and cooling transmission ratio ECR (k), ECR (k +1), ECR (k +2) and ECR (k +3) of the delivery pump is greater than 5 at the k th time, the k +1 th time, the k +2 th time and the k +3 th time, and the power consumption and cooling transmission ratio ECR (k +4) of the delivery pump is less than or equal to 5 at the k +4 th time, the air conditioning system is maintained in the free cooling mode of the cooling tower. Or, if the power consumption and cooling rate ECR (k), ECR (k +1), ECR (k +2), ECR (k +3) and ECR (k +4) of the delivery pump are all larger than 5 at the k th time, the k +1 th time, the k +2 th time, the k +3 th time and the k +4 th time, and the power consumption and cooling rate ECR (k +4) of the delivery pump is smaller than or equal to 5 at the k +5 th time, the air conditioning system is maintained to be in the free cooling mode of the cooling tower.
When the air conditioning system is in the free cooling mode of the cooling tower, the invention controls whether the free cooling mode is closed or not by monitoring the temperature of the supply and return water of the cooling tower, the circulation flow of the cooling water and the energy consumption of the delivery pump corresponding to the cooling tower and controlling the energy consumption index of the delivery pump, thereby forming a set of simple and effective method for controlling the cooling mode of the cooling tower and realizing the purpose of saving energy of the cooling water system.
Referring to fig. 3, fig. 3 is a schematic block diagram of a cooling tower cooling mode control system of an air conditioning system according to the present invention. The cooling tower cooling mode control system of the air conditioning system can realize the control method of the embodiment.
As shown in fig. 3, the cooling tower cooling mode control system of the air conditioning system may include: a judging unit 10, an acquisition unit 20 and a control unit 30.
And the judging unit 10 is used for judging whether the air conditioning system is in a free cooling mode of the cooling tower.
And the acquisition unit 20 is used for acquiring the real-time dew point temperature of the outdoor air through the sensor when the air conditioning system is in a non-cooling tower free cooling mode.
Optionally, the acquisition unit 20 may include a dew point temperature sensor.
And the control unit 30 is used for comparing the real-time dew point temperature with the indoor dry bulb temperature set value according to preset conditions and controlling the cooling mode of the air conditioning system according to the comparison result.
Optionally, the control unit 30 of the embodiment of the present invention may include a calculation module 301. The calculating module 301 is configured to add the real-time dew point temperature to a preset temperature rise to obtain a comparison temperature.
The control unit 30 may further include: a comparison and judgment module 302, a repeated execution module 303, a first judgment module 304 and a control module 305.
A comparison and determination module 302, configured to compare the comparison temperature with the indoor dry-bulb temperature setting value, and determine whether the comparison temperature is less than the indoor dry-bulb temperature setting value.
And the repeated execution module 303 is configured to, when the comparison temperature is lower than the indoor dry bulb temperature set value, sequentially control the acquisition unit, the execution and comparison determination module 302 to execute repeatedly at preset time intervals until a preset time period is reached.
A first determining module 304, configured to determine whether the comparison temperature at each time obtained in the repeated executing module 303 is less than the corresponding indoor dry bulb temperature setting value.
A control module 305, configured to control the air conditioning system to switch to the free cooling mode of the cooling tower when the comparison temperature obtained in the repeated execution module 303 at each time is less than the corresponding indoor dry bulb temperature setting value, otherwise, maintain the current cooling mode of the air conditioning system.
Further, the cooling tower cooling mode control system of the air conditioning system may further include: a second acquisition unit 40, an arithmetic processing unit 50 and a judgment execution unit 60.
And the second acquisition unit 40 is used for acquiring the current state information of the cooling tower and the energy consumption information of the delivery pump corresponding to the cooling tower when the air conditioning system is in the free cooling mode of the cooling tower.
Alternatively, the second collecting unit 40 may include a water temperature sensor and a water flow rate sensor.
And the operation processing unit 50 is used for performing operation processing on the current state information and the energy consumption information to obtain the power consumption and cooling transmission ratio of the conveying pump.
And the judging and executing unit 60 is used for judging whether the power consumption and cooling transmission ratio of the conveying pump meets the preset switching condition, and if not, executing the switching action.
The preset switching condition comprises that the power consumption cold transmission ratio of the delivery pump is larger than a threshold value or the power consumption cold transmission ratio of the delivery pump is smaller than or equal to the threshold value and is kept for a preset time period.
Further, the determination performing unit 60 may include: a second judging module 601, an executing module 602 and a third judging module 603.
And the second judging module 601 is used for judging whether the power consumption and cooling transmission ratio of the conveying pump is greater than a threshold value.
And the execution module 602 is configured to maintain the air conditioning system in a free cooling mode for the cooling tower when the power consumption/cooling loss ratio of the delivery pump is smaller than a threshold.
A third determining module 603, configured to determine whether the power consumption cold output ratio of the transfer pump is less than or equal to the threshold in a preset time period when the power consumption cold output ratio of the transfer pump is less than the threshold, and if so, execute a switching action.
It can be understood that the determining unit 10, the control unit 30, the operation processing unit 50 and the determining executing unit 60 in the cooling tower cooling mode control system of the air conditioning system of the present invention may all be disposed in the BAS system or the IBMS system, and implement corresponding function control and mode switching through the BAS system or the IBMS system, so as to achieve the function of remotely controlling and switching the cooling tower cooling mode on-line, and at the same time, implement opening and closing of the free cooling mode of the cooling tower of the air conditioning system.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims (8)

1. A cooling tower cooling mode control method of an air conditioning system is characterized by comprising the following steps:
s1, judging whether the air conditioning system is in a free cooling mode of the cooling tower;
s2, if not, acquiring real-time dew point temperature of outdoor air and indoor dry bulb temperature set values through a sensor;
s3, performing operation processing on the real-time dew point temperature and the indoor dry bulb temperature set value, and controlling the cooling mode of the air conditioning system according to the operation processing result;
if the air conditioning system is in a free cooling mode of the cooling tower, executing the following steps:
a1, acquiring the current state information of the cooling tower and the energy consumption information of the transfer pump corresponding to the cooling tower, wherein,
the current state information of the cooling tower is the current state information of the cooling tower at any moment, and comprises the water supply temperature, the water return temperature and the circulating flow of cooling water of the cooling tower;
a2, performing operation processing on the current state information and the energy consumption information to obtain the power consumption and cold consumption ratio of the delivery pump, wherein,
the calculation formula of the power consumption and cooling transmission ratio of the delivery pump is as follows:
Figure 444058DEST_PATH_IMAGE001
；
wherein, CwaterDenotes the specific heat capacity of cooling water, Mwaterindicates the circulating flow rate, DeltaT, of the cooling waterwaterIndicating the temperature difference between the water supply temperature and the water return temperature of the cooling water;
a3, judging whether the power consumption and cooling output ratio of the conveying pump meets a preset switching condition, and if not, executing a switching action;
the preset switching condition is that the power consumption and cooling transmission ratio of the delivery pump is greater than a threshold value.
2. The cooling tower cooling mode control method of an air conditioning system according to claim 1, wherein the step S3 includes:
and S3-0, adding the real-time dew point temperature and a preset temperature rise to obtain a comparative temperature.
3. The cooling tower cooling mode control method of an air conditioning system according to claim 2, wherein the step S3 further includes:
s31, comparing the comparison temperature with the indoor dry bulb temperature set value, and judging whether the comparison temperature is smaller than the indoor dry bulb temperature set value;
s32, if the comparison temperature is smaller than the indoor dry bulb temperature set value, repeatedly executing the step S2, the step S3-0 and the step S31 at preset time intervals until reaching a preset time period, and then executing the step S33;
s33, judging whether the comparison temperature obtained in the step S32 at each moment is smaller than the corresponding indoor dry bulb temperature set value or not;
s34, if yes, controlling the air conditioning system to switch to a free cooling mode of the cooling tower; if not, maintaining the current cooling mode of the air conditioning system.
4. The cooling tower cooling mode control method of an air conditioning system as claimed in claim 1, wherein the step a3 comprises:
a31, judging whether the power consumption and cooling delivery ratio of the delivery pump is greater than a threshold value;
a32, if yes, maintaining the air conditioning system as a free cooling mode of the cooling tower;
and A33, if not, judging whether the power consumption and cooling output ratio of the delivery pump is less than or equal to a threshold value in a preset time period, and if so, executing a switching action.
5. A cooling tower cooling mode control system for an air conditioning system, comprising:
the judging unit is used for judging whether the air conditioning system is in a free cooling mode of the cooling tower;
the system comprises a collecting unit, a control unit and a control unit, wherein the collecting unit is used for collecting the real-time dew point temperature of outdoor air and the set value of indoor dry bulb temperature through a sensor when the air conditioning system is in a non-cooling tower free cooling mode;
the control unit is used for carrying out operation processing on the real-time dew point temperature and the indoor dry bulb temperature set value and controlling the cooling mode of the air conditioning system according to the operation processing result;
the second acquisition unit is used for acquiring the current state information of the cooling tower and the energy consumption information of the delivery pump corresponding to the cooling tower when the air conditioning system is in a free cooling mode of the cooling tower;
the operation processing unit is used for performing operation processing on the current state information and the energy consumption information to obtain the power consumption and cold consumption ratio of the conveying pump;
the judging and executing unit is used for judging whether the power consumption and cooling transmission ratio of the conveying pump meets a preset switching condition or not, and if not, executing a switching action;
the preset switching condition is that the power consumption and cooling transmission ratio of the delivery pump is greater than a threshold value.
6. The cooling tower cooling mode control system of an air conditioning system as set forth in claim 5, wherein said control unit comprises:
and the calculation module is used for adding the real-time dew point temperature and the preset temperature rise to obtain a comparison temperature.
7. The cooling tower cooling mode control system of an air conditioning system as set forth in claim 6, wherein said control unit further comprises:
the comparison and judgment module is used for comparing the comparison temperature with the indoor dry bulb temperature set value and judging whether the comparison temperature is smaller than the indoor dry bulb temperature set value or not;
the repeated execution module is used for sequentially controlling the acquisition unit and the execution and comparison judgment module to be repeatedly executed at preset time intervals until a preset time period is reached when the comparison temperature is less than the set indoor dry bulb temperature value;
the first judgment module is used for judging whether the comparison temperature at each moment obtained in the repeated execution module is smaller than the corresponding indoor dry bulb temperature set value or not;
and the control module is used for controlling the air conditioning system to be switched to a free cooling mode of the cooling tower when the comparison temperature obtained in the repeated execution module at each moment is less than the corresponding indoor dry bulb temperature set value, and otherwise, maintaining the current cooling mode of the air conditioning system.
8. The cooling tower cooling mode control system of an air conditioning system according to claim 5, wherein the determination performing unit includes:
the second judgment module is used for judging whether the power consumption and cooling transmission ratio of the conveying pump is greater than a threshold value;
the execution module is used for maintaining the air conditioning system in a free cooling mode of the cooling tower when the power consumption and cooling transmission ratio of the delivery pump is smaller than a threshold value;
and the third judging module is used for judging whether the power consumption cold transmission ratio of the conveying pump is smaller than or equal to a threshold value in a preset time period or not when the power consumption cold transmission ratio of the conveying pump is smaller than the threshold value, and if so, executing switching action.
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JP4074422B2 (en) * 2000-04-25 2008-04-09 株式会社Ｎｔｔファシリティーズ Air conditioner and its control method
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CN101650056B (en) * 2009-09-09 2011-09-14 北京康孚环境控制有限公司 Combined cold supply system of cooling towers and water cooling unit and control method thereof
CN101806488B (en) * 2010-03-16 2015-03-18 上海建科建筑节能技术股份有限公司 Energy-saving cooling tower cold supply system and cold supply method thereof
US20170010009A9 (en) * 2011-09-23 2017-01-12 R4 Ventures Llc Advanced Multi-Purpose Multistage Evaporative Cold Water/Cold Air Generating and Supply System
CN103542489B (en) * 2012-07-12 2015-12-09 珠海格力节能环保制冷技术研究中心有限公司 The control method of air-conditioning system, Apparatus and system
CN202734118U (en) * 2012-08-22 2013-02-13 清华大学 Large temperature difference air conditioning system used for data center heat removal
CN104132407A (en) * 2013-05-03 2014-11-05 林波荣 High-energy efficiency residential housing air conditioning system
CN103344023B (en) * 2013-07-15 2016-08-17 江苏省邮电规划设计院有限责任公司 A kind of electronic information machine room coupling-type cooling system
CN106051960A (en) * 2016-05-18 2016-10-26 江苏天纳节能科技股份有限公司 Cooling tower group cold and hot water mixed-using system for central air conditioner cooling and plate heat exchanger free cooling and using method thereof
CN206377813U (en) * 2016-12-26 2017-08-04 广州施杰节能科技有限公司 A kind of controlling system of central air conditioner
CN107560118B (en) * 2017-09-12 2020-04-21 深圳达实智能股份有限公司 Method and device for setting chilled water supply temperature of hospital refrigeration host

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