CN113983647A - Energy-saving control method for double-cold-source fresh air combined type air conditioning unit - Google Patents
Energy-saving control method for double-cold-source fresh air combined type air conditioning unit Download PDFInfo
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- CN113983647A CN113983647A CN202111223879.2A CN202111223879A CN113983647A CN 113983647 A CN113983647 A CN 113983647A CN 202111223879 A CN202111223879 A CN 202111223879A CN 113983647 A CN113983647 A CN 113983647A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 238000007791 dehumidification Methods 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims description 53
- 230000001276 controlling effect Effects 0.000 claims description 12
- 230000009977 dual effect Effects 0.000 claims description 7
- 238000009423 ventilation Methods 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 230000008859 change Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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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
- F24F11/30—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
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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
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an energy-saving control method of a double-cold-source fresh air combined type air conditioning unit, relates to the technical field of air conditioning units, and solves the technical problems that in the prior art, an air conditioning system binds the indoor environment temperature and the indoor environment humidity together and simultaneously adjusts and controls the indoor environment temperature and the indoor environment humidity, the energy consumption is high, and the indoor heat-humidity ratio change is difficult to adapt. The energy-saving control method of the double-cold-source fresh air combined type air conditioning unit controls the refrigerating capacity of the double-cold-source fresh air combined type air conditioning unit by controlling the water flow in the high-temperature surface cooling section of the high-temperature cold source system and/or the low-temperature surface cooling section of the low-temperature cold source system; the dehumidification capacity of the double-cold-source fresh air combined type air conditioning unit is controlled by controlling the water flow in the low-temperature surface cooling section of the low-temperature cold source system. Compared with the prior art, the energy-saving control method of the double-cold-source fresh air combined type air conditioning unit has the advantages of saving energy and more effectively and accurately adjusting and controlling the environmental temperature and humidity.
Description
Technical Field
The invention relates to the technical field of air conditioning units, in particular to an energy-saving control method of a double-cold-source fresh air combined type air conditioning unit.
Background
For any air conditioning system, there are and only two types of air conditioning system loads: one is the increase or decrease in the indoor ambient temperature due to heat conduction, convection, radiation, etc., referred to as "sensible heat load"; the other is the increase or decrease of the indoor environmental humidity caused by the indoor human body humidity dissipation, the equipment and process humidity dissipation or air permeation, and is called as latent heat load. Since the birth of air conditioning systems, people have bundled "sensible heat load" and "latent heat load" together and handled simultaneously, realizing the simultaneous regulation and control of indoor ambient temperature and indoor ambient humidity.
However, the applicant has found that the conventional air conditioning system, which binds the indoor ambient temperature and the indoor ambient humidity together while adjusting and controlling, has at least the following problems: (1) high energy consumption. Specifically, in order to dehumidify air, the temperature of chilled water of the air conditioning system is set at a lower level, generally 7-12 ℃, and the temperature and the humidity are bound together by the air conditioning system, so that the chilled water with the low temperature is adopted for adjusting the air temperature, the cold source refrigeration energy efficiency of the air conditioning system is lower, and the energy consumption of the air conditioning system is high. (2) It is difficult to adapt to the change of indoor heat-moisture ratio. Specifically, because the heat-humidity ratio of the air-conditioning environment is different under different buildings, different indoor use functions and different external meteorological conditions, even the heat-humidity ratio of the same air-conditioning room in different time periods is changed, the indoor temperature and the indoor humidity are bound together and simultaneously treated, so that the indoor temperature and the indoor humidity are difficult to simultaneously meet the requirements, or in order to meet the requirements, transition cooling and reheating modes are often adopted, and more energy consumption is required.
Disclosure of Invention
One of the purposes of the invention is to provide an energy-saving control method for a double-cold-source fresh air combined type air conditioning unit, which solves the technical problems that in the prior art, an air conditioning system binds the indoor environment temperature and the indoor environment humidity together and simultaneously adjusts and controls the indoor environment temperature and the indoor environment humidity, the energy consumption is high, and the indoor heat-humidity ratio change is difficult to adapt. The various technical effects that can be produced by the preferred technical solution of the present invention are described in detail below.
In order to achieve the purpose, the invention provides the following technical scheme:
the energy-saving control method of the double-cold-source fresh air combined type air conditioning unit controls the refrigerating capacity of the double-cold-source fresh air combined type air conditioning unit by controlling the water flow in the high-temperature surface cooling section of the high-temperature cold source system and/or the low-temperature surface cooling section of the low-temperature cold source system; the dehumidification capacity of the double-cold-source fresh air combined type air conditioning unit is controlled by controlling the water flow in the low-temperature surface cooling section of the low-temperature cold source system.
According to a preferred embodiment, the energy-saving control method of the double-cold-source fresh air combined type air conditioning unit comprises the following steps: acquiring the fresh air temperature of the double-cold-source fresh air combined type air conditioning unit; comparing the fresh air temperature with a preset fresh air temperature range; and determining the opening states of a high-temperature meter cold section and a low-temperature meter cold section of the double-cold-source fresh air combined type air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature range, and enabling the air supply temperature of the double-cold-source fresh air combined type air conditioning unit not to be lower than the indoor environment dew point temperature and the indoor environment humidity not to be higher than the preset indoor environment humidity.
According to a preferred embodiment, the energy-saving control method of the dual-cold-source fresh air combined type air conditioning unit further comprises the following steps: and determining the opening states of a fresh air electric two-way adjusting air valve and a proportional integral adjusting air valve of the double-cold-source fresh air combined type air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature.
According to a preferred embodiment, when the fresh air temperature is greater than the maximum value of the preset fresh air temperature range, the high-temperature meter cold section and the electric two-way water regulating valve are opened, and the low-temperature meter cold section and the proportional-integral electric water regulating valve are opened; when the fresh air temperature is within the preset fresh air temperature range, closing the high-temperature meter cold section and the electric two-way regulating water-saving valve, and opening the low-temperature meter cold section and the proportional-integral electric regulating water-saving valve; and when the fresh air temperature is less than the minimum value of the preset fresh air temperature range, closing the high-temperature meter cold section and the electric two-way regulating water-saving valve, and closing the low-temperature meter cold section and the proportional-integral electric regulating water-saving valve.
According to a preferred embodiment, the determining of the opening states of the high-temperature surface cooling section and the low-temperature surface cooling section of the dual-cold-source fresh air combined type air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature range further comprises the following steps: acquiring indoor environment temperature and indoor environment humidity; comparing the indoor environment temperature with a preset indoor environment temperature, and comparing the indoor environment humidity with a preset indoor environment humidity; and adjusting the opening of the proportional-integral electric adjusting water valve based on the comparison result of the indoor environment temperature and the preset indoor environment temperature and/or the comparison result of the indoor environment humidity and the preset indoor environment humidity.
According to a preferred embodiment, when the indoor environment temperature is lower than the preset indoor environment temperature, the opening of the proportional-integral electric regulating water valve is reduced; and when the indoor environment temperature is higher than the preset indoor environment temperature and/or the indoor environment humidity is higher than the preset indoor environment humidity, the opening of the proportional-integral electric regulating water valve is regulated to be larger.
According to a preferred embodiment, when the fresh air temperature is greater than the maximum value of the preset fresh air temperature range, the fresh air electric two-way adjusting air valve is opened, the proportional-integral adjusting air valve is closed, and the indoor fresh air volume is enabled to be not less than the minimum value of the preset indoor fresh air volume; when the fresh air temperature is within the preset fresh air temperature range, opening the fresh air electric two-way adjusting air valve, closing the proportional-integral adjusting air valve, and enabling the indoor fresh air volume to be not more than the maximum value of the preset indoor fresh air volume; and when the fresh air temperature is smaller than the minimum value of the preset fresh air temperature range, opening the fresh air electric two-way adjusting air valve, and opening the proportional-integral adjusting air valve to enable the indoor fresh air volume to be not smaller than the minimum value of the preset indoor fresh air volume.
According to a preferred embodiment, the determining of the opening states of the fresh air electric two-way adjusting air valve and the proportional-integral adjusting air valve of the dual-cold-source fresh air combined type air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature further comprises the following steps: acquiring a difference value between the pressure of the indoor environment and the external atmospheric pressure; comparing the difference between the pressure of the indoor environment and the external atmospheric pressure with a preset difference; and adjusting the opening of the fresh air electric two-way adjusting air valve based on the comparison result of the difference value between the pressure of the indoor environment and the external atmospheric pressure and the preset difference value, and enabling the pressure of the indoor environment to be larger than the external atmospheric pressure and the difference value between the pressure of the indoor environment and the external atmospheric pressure to be kept within the preset difference value range.
According to a preferred embodiment, when the difference between the pressure of the indoor environment and the external atmospheric pressure is greater than a preset difference, the opening of the fresh air electric two-way regulating air valve is reduced; and when the difference value between the pressure of the indoor environment and the external atmospheric pressure is smaller than the preset difference value, the opening degree of the fresh air electric two-way adjusting air valve is increased.
According to a preferred embodiment, the energy-saving control method for the dual-cold-source combined fresh air conditioning unit further adjusts the rated frequency of a blower of the dual-cold-source combined fresh air conditioning unit based on the indoor ventilation frequency, and keeps the indoor air volume within a preset indoor air volume range.
The energy-saving control method of the double-cold-source fresh air combined type air conditioning unit provided by the invention at least has the following beneficial technical effects:
the energy-saving control method of the double-cold-source fresh air combined type air conditioning unit adopts the high-temperature cold source system and the low-temperature cold source system to share the total load of the air conditioner, and particularly controls the refrigerating capacity of the double-cold-source fresh air combined type air conditioning unit by controlling the water flow in the high-temperature surface cooling section of the high-temperature cold source system and/or the low-temperature surface cooling section of the low-temperature cold source system; the dehumidification capacity of the double-cold-source fresh air combined type air conditioning unit is controlled by controlling the water flow in the low-temperature surface cooling section of the low-temperature cold source system, so that the comprehensive energy efficiency of the cold source system of the air conditioning system is improved, the energy conservation is realized, and the problem of high energy consumption of the air conditioning system caused by the fact that the traditional air conditioner only bears the total load of the air conditioner by the low-temperature cold source system is solved; on the other hand, the temperature and the humidity are independently regulated and controlled by different cold source systems, and compared with the mode that the temperature and the humidity are bound together to be regulated and controlled by a traditional air conditioner, the method can more effectively and accurately regulate and control the temperature and the humidity without transitional cooling and reheating, thereby being capable of better adapting to the change of indoor heat-humidity ratio without energy waste and further realizing energy conservation.
The energy-saving control method of the double-cold-source fresh air combined type air conditioning unit solves the technical problems that in the prior art, an air conditioning system binds the indoor environment temperature and the indoor environment humidity together and simultaneously adjusts and controls the indoor environment temperature and the indoor environment humidity, the energy consumption is high, and the indoor heat-humidity ratio change is difficult to adapt.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a preferred embodiment of a dual cold source fresh air combined air conditioning unit according to the present invention;
fig. 2 is a schematic diagram of a preferred embodiment of the energy-saving control system of the dual-cold-source fresh air combined type air conditioning unit.
In the figure: 1. a fresh air section; 2. a coarse filtration section; 3. a high-temperature surface cooling section; 4. a wind mixing section; 5. a blower section; 6. a current equalizing section; 7. a low-temperature surface cooling section; 8. an air outlet section; 9. a fresh air quantity sensor; 10. a fresh air temperature sensor; 11. proportional-integral regulating air valve; 12. a return air temperature sensor; 13. a return air quantity sensor; 14. an air supply volume sensor; 15. a first supply air temperature sensor; 16. an air supply electric two-way adjusting air valve; 17. a second supply air temperature sensor; 18. an indoor temperature and humidity sensor; 19. an indoor differential pressure sensor; 20. indoor; 21. a low temperature chiller; 22. a high temperature water chilling unit; 23. a proportional integral electric water regulating valve; 24. an electric two-way water regulating valve; 25. fresh air electric two-way adjusting air valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The energy-saving control method of the dual-cold-source fresh air combined type air conditioning unit is described in detail below with reference to the attached drawings 1 and 2 and the embodiments 1 and 2 in the specification.
Example 1
The present embodiment describes the dual cold source fresh air combined air conditioning unit and the energy saving control system thereof in detail.
Fig. 1 shows a schematic diagram of a preferred embodiment of the dual-cold-source fresh air combined type air conditioning unit in this embodiment. As shown in fig. 1, the dual-cold-source fresh air combined air conditioning unit includes a fresh air section 1, a coarse-effect filtering section 2, a high-temperature surface cooling section 3, an air mixing section 4, a blower section 5, a flow equalizing section 6, a low-temperature surface cooling section 7 and an air outlet section 8. Wherein, the fresh air section 1 is a part for fresh air to enter; the coarse filtering section 2 is used for filtering fresh air; the high-temperature surface cooling section 3 is used for pre-cooling fresh air and/or return air by high-temperature water; the air mixing section 4 is a part for mixing fresh air and return air; the air blower section 5 is used for blowing precooled fresh air and/or return air into a room; the flow equalizing section 6 is used for enabling the blown fresh air and/or return air to uniformly flow out; the low-temperature surface cooling section 7 is used for cooling low-temperature water, dehumidifying and refrigerating fresh air and/or return air; the air outlet section 8 is used for air outlet.
Fig. 2 shows a schematic diagram of a preferred embodiment of the energy-saving control system of the dual-cold-source fresh air combined type air conditioning unit in the embodiment. As shown in fig. 2, the energy-saving control system of the dual-cold-source fresh air combined type air conditioning unit not only comprises the dual-cold-source fresh air combined type air conditioning unit shown in fig. 1, but also comprises the following structures: the system comprises a fresh air volume sensor 9, a fresh air temperature sensor 10, a proportional integral regulating air valve 11, a return air temperature sensor 12, a return air volume sensor 13, an air supply volume sensor 14, a first air supply temperature sensor 15, an air supply electric two-way regulating air valve 16, a second air supply temperature sensor 17, an indoor temperature and humidity sensor 18, an indoor differential pressure sensor 19, a low-temperature water chilling unit 21, a high-temperature water chilling unit 22, a proportional integral electric regulating water valve 23, an electric two-way regulating water valve 24 and a fresh air electric two-way regulating air valve 25. Wherein, the fresh air volume sensor 9 is used for detecting fresh air volume; the fresh air temperature sensor 10 is used for detecting fresh air temperature; the proportional-integral regulating air valve 11 is used for regulating the air return quantity; the return air temperature sensor 12 is used for detecting the return air temperature; the return air quantity sensor 13 is used for detecting the return air quantity; the blowing air volume sensor 14 is used for detecting blowing air volume; the first air supply temperature sensor 15 is used for detecting the air supply temperature at the flow equalizing section 6; the air supply electric two-way adjusting air valve 16 is used for adjusting the air supply quantity; the second air supply temperature sensor 17 is used for detecting the air supply temperature coming out of the air outlet section 8; the indoor temperature and humidity sensor 18 is used for detecting the temperature and humidity of the indoor 20; an indoor differential pressure sensor 19 for detecting a differential pressure in the room 20; the low-temperature water chilling unit 21 is used for conveying low-temperature cold water; the high-temperature water chilling unit 22 is used for conveying high-temperature cold water; the proportional integral electric water regulating valve 23 is used for regulating the water flow delivered to the low-temperature meter cold section 7; the electric two-way water regulating valve 24 is used for regulating the water flow delivered to the cold section 3 of the high temperature meter; the fresh air electric two-way adjusting air valve 25 is used for adjusting fresh air quantity.
The fresh air volume sensor 9, the fresh air temperature sensor 10, the proportional integral regulating air valve 11, the return air temperature sensor 12, the return air volume sensor 13, the supply air volume sensor 14, the first supply air temperature sensor 15, the supply electric two-way regulating air valve 16, the second supply air temperature sensor 17, the indoor temperature and humidity sensor 18, the indoor differential pressure sensor 19, the low-temperature water chilling unit 21, the high-temperature water chilling unit 22, the proportional integral electric regulating water valve 23, the electric two-way regulating water valve 24 and the fresh air electric two-way regulating air valve 25 in the embodiment can be structures in the prior art, and specific structures are not repeated. Preferably, each sensor has a communication function to transmit detected data to the controller.
Example 2
The embodiment describes the energy-saving control method of the dual-cold-source fresh air combined type air conditioning unit in detail. The energy-saving control method of the dual-cold-source fresh air combined type air conditioning unit is realized based on the dual-cold-source fresh air combined type air conditioning unit and the energy-saving control system thereof in any technical scheme of the embodiment 1.
It should be noted that, in the energy-saving control method of the dual-cold-source fresh air combined air conditioning unit of the embodiment, the "sensible heat load" and the "latent heat load" are separated and processed respectively, so as to realize independent adjustment and control of the temperature and humidity of the indoor environment. The double cold sources in this embodiment refer to a cold source system composed of a high-temperature cold source and a low-temperature cold source, that is, two cold sources with different evaporation temperatures are simultaneously used in one air conditioning system, and share the load of the air conditioning system. The low-temperature cold source is a cold source with an evaporation temperature of 225 ℃ (the temperature of chilled water supply is about 7 ℃), and the high-temperature cold source is a general name of a cold source with an evaporation temperature significantly higher than 225 ℃ and various natural cold sources.
According to the energy-saving control method of the double-cold-source fresh air combined type air conditioning unit, the refrigerating capacity of the double-cold-source fresh air combined type air conditioning unit is controlled by controlling the water flow in the high-temperature surface cooling section 3 of the high-temperature cold source system and/or the low-temperature surface cooling section 7 of the low-temperature cold source system; the dehumidification capacity of the double-cold-source fresh air combined type air conditioning unit is controlled by controlling the water flow in the low-temperature surface cooling section 7 of the low-temperature cold source system. That is, the energy-saving control method of the dual cold source fresh air combined type air conditioning unit of the embodiment can adjust and control the temperature of the environment through one or both of the high temperature surface cooling section 3 and the low temperature surface cooling section 7, and adjust and control the humidity of the environment through the low temperature surface cooling section 7.
In the energy-saving control method of the dual-cold-source fresh air combined type air conditioning unit, the high-temperature cold source system and the low-temperature cold source system share the total load of the air conditioner, and specifically, the refrigerating capacity of the dual-cold-source fresh air combined type air conditioning unit is controlled by controlling the water flow in the high-temperature surface cooling section 3 of the high-temperature cold source system and/or the low-temperature surface cooling section 7 of the low-temperature cold source system; the dehumidification capacity of the double-cold-source fresh air combined type air conditioning unit is controlled by controlling the water flow in the low-temperature surface cooling section 7 of the low-temperature cold source system, so that the comprehensive energy efficiency of the cold source system of the air conditioning system is improved, the energy conservation is realized, and the problem of high energy consumption of the air conditioning system caused by the fact that the traditional air conditioner only bears the total load of the air conditioner by the low-temperature cold source system is solved; on the other hand, in the energy-saving control method of the dual-cold-source fresh air combined type air conditioning unit, the temperature and the humidity are independently adjusted and controlled by different cold source systems, and compared with the mode that the temperature and the humidity are bound together to be adjusted and controlled by a traditional air conditioner, the method can more effectively and accurately adjust and control the temperature and the humidity without transitional cooling and reheating, so that the change of the indoor heat-humidity ratio can be better adapted, energy waste does not exist, and energy saving is further realized. The energy-saving control method of the double-cold-source fresh air combined type air conditioning unit solves the technical problems that in the prior art, an air conditioning system binds the indoor environment temperature and the indoor environment humidity together and simultaneously adjusts and controls the indoor environment temperature and the indoor environment humidity, the energy consumption is high, and the indoor heat-humidity ratio change is difficult to adapt.
According to a preferred embodiment, the energy-saving control method of the double-cold-source fresh air combined type air conditioning unit comprises the following steps:
s1: and acquiring the fresh air temperature of the double-cold-source fresh air combined type air conditioning unit. Specifically, the fresh air temperature of the dual cold source fresh air combined type air conditioning unit is measured by the fresh air temperature sensor 10.
S2: and comparing the fresh air temperature with a preset fresh air temperature range. Specifically, the preset fresh air temperature range may be determined based on actual conditions, for example, the preset fresh air temperature range 12218.5 ℃.
S3: and determining the opening states of a high-temperature meter cold section 3 and a low-temperature meter cold section 7 of the double-cold-source fresh air combined type air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature range, and enabling the air supply temperature of the double-cold-source fresh air combined type air conditioning unit not to be lower than the indoor environment dew point temperature and the indoor environment humidity not to be higher than the preset indoor environment humidity. Specifically, the indoor environment dew point temperature is determined according to the actual conditions of the indoor working conditions, and the preset indoor environment humidity can also be determined based on the actual conditions, for example, the indoor environment dew point temperature is 13.9 ℃, and the preset indoor environment humidity is 60%. According to the preferable technical scheme, the air supply temperature of the double-cold-source fresh air combined type air conditioning unit is not lower than the dew point temperature of the indoor environment, so that the problem that the indoor working condition is influenced due to the fact that the indoor temperature is too low and dew condensation occurs can be solved; meanwhile, the indoor environment humidity is not higher than the preset indoor environment humidity, and the problem that the indoor working condition is influenced due to overlarge indoor humidity can be avoided.
According to a preferred embodiment, when the fresh air temperature is greater than the maximum value of the preset fresh air temperature range, the air conditioning unit is in a summer control mode; when the fresh air temperature is smaller than the minimum value of the preset fresh air temperature range, the air conditioning unit is in a transition season control mode; and when the fresh air temperature is less than the minimum value of the preset fresh air temperature range, the air conditioning unit is in a winter control mode. For example, when the fresh air temperature measured by the fresh air temperature sensor 10 is higher than 18.5 ℃, the air conditioning unit is in a summer control mode; when the fresh air temperature measured by the fresh air temperature sensor 10 is in the range of 12218.5 ℃, the air conditioning unit is in a transition season control mode; when the fresh air temperature measured by the fresh air temperature sensor 10 is less than 12 ℃, the air conditioning unit is in a winter season control mode.
Specifically, when the fresh air temperature is greater than the maximum value of the preset fresh air temperature range, the high-temperature meter cold section 3 and the electric two-way regulating water-saving valve 24 are opened, and the low-temperature meter cold section 7 and the proportional-integral electric regulating water-saving valve 23 are opened, so that the cold water in the high-temperature water chilling unit 22 flows to the high-temperature meter cold section 3 through the electric two-way regulating water-saving valve 24, and the cold water in the low-temperature water chilling unit 21 flows to the low-temperature meter cold section 7 through the proportional-integral electric regulating water-saving valve 23, so as to regulate the indoor environment temperature or the temperature and the humidity. When the fresh air temperature is greater than the maximum value of the preset fresh air temperature range, namely the air conditioning unit is in a summer control mode, the environment temperature is mainly adjusted, the indoor environment temperature is adjusted by the high-temperature surface cooling section 3 and the low-temperature surface cooling section 7 together by opening the high-temperature surface cooling section 3 in the mode, and the purpose of quickly adjusting the indoor environment temperature can be achieved.
Specifically, when the fresh air temperature is within the preset fresh air temperature range, the high temperature meter cold section 3 and the electric two-way regulating water-saving valve 24 are closed, and the low temperature meter cold section 7 and the proportional-integral electric regulating water-saving valve 23 are opened, so that cold water in the low temperature water chilling unit 21 can flow to the low temperature meter cold section 7 through the proportional-integral electric regulating water-saving valve 23, and the indoor environment temperature, or the temperature and the humidity can be regulated. When new trend temperature is when predetermineeing new trend temperature range, the air conditioning unit is in transition season control mode promptly, and indoor ambient temperature generally does not differ very much with predetermineeing indoor ambient temperature, only opens cryometer cold section 7 this moment, also can realize the purpose to indoor ambient temperature regulation, closes pyrometer cold section 3 under this mode, has energy-conserving advantage.
Specifically, when the fresh air temperature is lower than the minimum value of the preset fresh air temperature range, the high-temperature meter cold section 3 and the electric two-way regulating water-saving valve 24 are closed, and the low-temperature meter cold section 7 and the proportional-integral electric regulating water-saving valve 23 are closed. When the fresh air temperature is smaller than the minimum value of the preset fresh air temperature range, namely the air conditioning unit is in a winter control mode, the indoor temperature can be kept at the preset value only by adjusting the ratio of the fresh air quantity to the return air quantity, and the high-temperature meter cooling section 3 and the low-temperature meter cooling section 7 are closed in the mode, so that the energy-saving advantage is achieved.
According to a preferred embodiment, the determining of the opening states of the high-temperature surface cooling section 3 and the low-temperature surface cooling section 7 of the dual-cold-source fresh air combined type air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature range further comprises the following steps:
s301: and acquiring the indoor environment temperature and the indoor environment humidity. Specifically, the indoor ambient temperature and the indoor ambient humidity are measured by the indoor temperature/humidity sensor 18.
S302: and comparing the indoor environment temperature with a preset indoor environment temperature, and comparing the indoor environment humidity with a preset indoor environment humidity. For example, the indoor ambient temperature is preset to 22 ℃.
S303: the opening degree of the proportional-integral electric water regulating valve 23 is regulated based on the comparison result of the indoor ambient temperature with the preset indoor ambient temperature and/or the comparison result of the indoor ambient humidity with the preset indoor ambient humidity. Specifically, when the indoor ambient temperature is lower than the preset indoor ambient temperature, the opening of the proportional-integral electric water regulating valve 23 is reduced, so that the air supply temperature of the air conditioning unit is increased, and the indoor ambient temperature is not lower than the preset indoor ambient temperature. When the indoor environment temperature is higher than the preset indoor environment temperature and/or the indoor environment humidity is higher than the preset indoor environment humidity, the opening degree of the proportional-integral electric adjusting water valve 23 is adjusted to reduce the air supply temperature of the air conditioning unit so as to ensure that the indoor environment temperature is not higher than the preset indoor environment temperature and/or the indoor environment humidity is not higher than the preset indoor environment humidity.
According to a preferred embodiment, the energy-saving control method of the dual-cold-source fresh air combined type air conditioning unit further comprises the following steps:
s4: and determining the opening states of the fresh air electric two-way adjusting air valve 25 and the proportional integral adjusting air valve 11 of the double-cold-source fresh air combined air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature. The preferred technical scheme of this embodiment still confirms the open mode of fresh air electronic two-way regulating air valve 25 and proportional-integral regulating air valve 11 of double-cold-source fresh air combined air conditioning unit based on the comparison result of fresh air temperature and preset fresh air temperature, not only can guarantee the indoor required fresh air volume, when air conditioning unit is in winter control mode, still can rely on the proportion of adjusting fresh air volume and return air volume to make indoor temperature keep the default, have energy-conserving advantage.
Specifically, when the fresh air temperature is greater than the maximum value of the preset fresh air temperature range, the fresh air electric two-way adjusting air valve 25 is opened, the proportional-integral adjusting air valve 11 is closed, and the indoor fresh air volume is not less than the minimum value of the preset indoor fresh air volume. The indoor fresh air volume is measured by the fresh air volume sensor 9. When the fresh air temperature is larger than the maximum value of the preset fresh air temperature range, namely the air conditioning unit is in a summer control mode, the environment temperature is mainly adjusted, in the mode, the fresh air electric two-way adjusting air valve 25 is opened, the proportional-integral adjusting air valve 11 is closed, the air conditioning unit operates in a full fresh air mode, the minimum value of indoor fresh air volume is controlled, and the air conditioning unit is favorable for adjusting the environment temperatureThe indoor environment temperature is rapidly adjusted. The minimum value of the preset indoor fresh air volume can be determined based on actual conditions, for example, the minimum value of the preset indoor fresh air volume is 300000m3/h。
Specifically, when the fresh air temperature is within the preset fresh air temperature range, the fresh air electric two-way adjusting air valve 25 is opened, the proportional-integral adjusting air valve 11 is closed, and the indoor fresh air volume is not larger than the maximum value of the preset indoor fresh air volume. The indoor fresh air volume is measured by the fresh air volume sensor 9. When the fresh air temperature is within the range of the preset fresh air temperature, namely the air conditioning unit is in a transition season control mode, the indoor environment temperature generally has little difference with the preset indoor environment temperature, the fresh air electric two-way adjusting air valve 25 is opened in the mode, the proportional integral adjusting air valve 11 is closed, the air conditioning unit is enabled to operate in a full fresh air mode, the maximum value of the indoor fresh air volume is controlled, and the energy conservation is facilitated. The maximum value of the preset indoor fresh air volume can be determined based on actual conditions, for example, the maximum value of the preset indoor fresh air volume is 630000m3/h。
Specifically, when the fresh air temperature is smaller than the minimum value of the preset fresh air temperature range, the fresh air electric two-way adjusting air valve 25 is opened, the proportional-integral adjusting air valve 11 is opened, and the indoor fresh air volume is enabled to be not smaller than the minimum value of the preset indoor fresh air volume. The indoor fresh air volume is measured by the fresh air volume sensor 9. When the fresh air temperature is smaller than the minimum value of the preset fresh air temperature range, namely the air conditioning unit is in a winter control mode, the fresh air electric two-way adjusting air valve 25 is opened in the mode, the proportional-integral adjusting air valve 11 is opened, the circulating air mode is adopted for operation, the indoor temperature can be kept at the preset value by adjusting the ratio of the fresh air volume to the return air volume and controlling the minimum value of the indoor fresh air volume, and the energy-saving air conditioning unit has the advantage of energy conservation. The minimum value of the preset indoor fresh air volume can be determined based on actual conditions, for example, the minimum value of the preset indoor fresh air volume is 300000m3/h。
According to a preferred embodiment, the determining the opening states of the fresh air electric two-way adjusting air valve 25 and the proportional-integral adjusting air valve 11 of the dual-cold-source fresh air combined type air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature further comprises the following steps:
s401: and acquiring the difference between the pressure of the indoor environment and the external atmospheric pressure. Specifically, the difference between the pressure of the indoor environment and the external atmospheric pressure is measured by the indoor differential pressure sensor 19.
S402: the difference between the pressure of the indoor environment and the external atmospheric pressure is compared with a preset difference. Specifically, the preset difference may be determined based on actual conditions. For example, the preset difference is 5 Pa.
S403: the opening of the fresh air electric two-way regulating air valve 25 is regulated based on the comparison result of the difference between the pressure of the indoor environment and the external atmospheric pressure and the preset difference, and the pressure of the indoor environment is greater than the external atmospheric pressure and the difference between the pressure of the indoor environment and the external atmospheric pressure is kept within the preset difference range. Specifically, when the difference between the pressure of the indoor environment and the external atmospheric pressure is greater than a preset difference, the opening of the fresh air electric two-way regulating air valve 25 is reduced, so that the indoor fresh air volume is reduced, and the indoor environment pressure is maintained. When the difference between the pressure of the indoor environment and the external atmospheric pressure is smaller than the preset difference, the opening of the fresh air electric two-way adjusting air valve 25 is increased, so that the indoor fresh air quantity is increased, and the indoor environment pressure is maintained. The preferred technical scheme of this embodiment is through adjusting the aperture of electronic two-way governing air valve 25 of new trend, makes the pressure of indoor environment be greater than external atmospheric pressure and the difference of the pressure of indoor environment and external atmospheric pressure keep in presetting the difference within range, promptly: maintain indoor pressure, make indoor be in the malleation state all the time to can avoid indoor pressure undersize, lead to the problem of indoor humiture change of influence of external gas invasion, make indoor be in the malleation state all the time, help keeping indoor temperature and humidity invariable, further realize energy-conservingly.
According to a preferred embodiment, the energy-saving control method of the dual-cold-source combined fresh air conditioning unit further adjusts the rated frequency of a blower of the dual-cold-source combined fresh air conditioning unit based on the indoor ventilation frequency, and keeps the indoor air volume within a preset indoor air volume range. Specifically, the indoor space is fixed, the more the ventilation times are, the larger the required air volume is, and at the moment, the rated frequency of the air feeder can be increased so as to ensure the indoor air volume; on the contrary, the less the number of times of ventilation is, the less the required air volume is, at this time, the rated frequency of the blower can be adjusted to be low, the air volume in the room can be ensured even if the blower is operated at the low rated frequency, and the blower is operated at the low rated frequency, which further contributes to energy saving.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The energy-saving control method of the double-cold-source fresh air combined type air conditioning unit is characterized in that the refrigerating capacity of the double-cold-source fresh air combined type air conditioning unit is controlled by controlling the water flow in a high-temperature surface cooling section (3) of a high-temperature cold source system and/or a low-temperature surface cooling section (7) of a low-temperature cold source system; the dehumidification capacity of the double-cold-source fresh air combined type air conditioning unit is controlled by controlling the water flow in a low-temperature surface cooling section (7) of a low-temperature cold source system.
2. The energy-saving control method of the double-cold-source fresh air combined type air conditioning unit according to claim 1, characterized by comprising the following steps:
acquiring the fresh air temperature of the double-cold-source fresh air combined type air conditioning unit;
comparing the fresh air temperature with a preset fresh air temperature range;
and determining the opening states of a high-temperature meter cold section (3) and a low-temperature meter cold section (7) of the double-cold-source fresh air combined type air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature range, and enabling the air supply temperature of the double-cold-source fresh air combined type air conditioning unit not to be lower than the indoor environment dew point temperature and the indoor environment humidity not to be higher than the preset indoor environment humidity.
3. The energy-saving control method of the dual cold source fresh air combined type air conditioning unit according to claim 2, characterized by further comprising the following steps: and determining the opening states of a fresh air electric two-way adjusting air valve (25) and a proportional-integral adjusting air valve (11) of the double-cold-source fresh air combined air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature.
4. The energy-saving control method of the double-cold-source fresh air combined type air conditioning unit as claimed in claim 2, wherein when the fresh air temperature is greater than the maximum value of the preset fresh air temperature range, the high-temperature meter cold section (3) and the electric two-way adjusting water valve (24) are opened, and the low-temperature meter cold section (7) and the proportional-integral electric adjusting water valve (23) are opened;
when the fresh air temperature is within the range of the preset fresh air temperature, the high-temperature meter cold section (3) and the electric two-way adjusting water valve (24) are closed, and the low-temperature meter cold section (7) and the proportional-integral electric adjusting water valve (23) are opened;
and when the fresh air temperature is less than the minimum value of the preset fresh air temperature range, the high-temperature meter cold section (3) and the electric two-way adjusting water valve (24) are closed, and the low-temperature meter cold section (7) and the proportional-integral electric adjusting water valve (23) are closed.
5. The energy-saving control method of the dual-cold-source fresh air combined type air conditioning unit according to claim 4, wherein the step of determining the opening states of the high-temperature surface cooling section (3) and the low-temperature surface cooling section (7) of the dual-cold-source fresh air combined type air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature range further comprises the following steps:
acquiring indoor environment temperature and indoor environment humidity;
comparing the indoor environment temperature with a preset indoor environment temperature, and comparing the indoor environment humidity with a preset indoor environment humidity;
and adjusting the opening of the proportional-integral electric adjusting water valve (23) based on the comparison result of the indoor environment temperature and the preset indoor environment temperature and/or the comparison result of the indoor environment humidity and the preset indoor environment humidity.
6. The energy-saving control method of the combined air conditioning unit with double cold sources and fresh air as claimed in claim 5, characterized in that when the indoor ambient temperature is lower than the preset indoor ambient temperature, the opening of the proportional-integral electric regulating water valve (23) is reduced;
and when the indoor environment temperature is higher than the preset indoor environment temperature and/or the indoor environment humidity is higher than the preset indoor environment humidity, the opening of the proportional-integral electric regulating water valve (23) is regulated to be larger.
7. The energy-saving control method of the dual-cold-source fresh air combined type air conditioning unit according to claim 3, characterized in that when the fresh air temperature is higher than the maximum value of the preset fresh air temperature range, the fresh air electric two-way adjusting air valve (25) is opened, the proportional-integral adjusting air valve (11) is closed, and the indoor fresh air volume is not less than the minimum value of the preset indoor fresh air volume;
when the fresh air temperature is within the preset fresh air temperature range, opening a fresh air electric two-way adjusting air valve (25), closing a proportional-integral adjusting air valve (11), and enabling the indoor fresh air volume to be not more than the maximum value of the preset indoor fresh air volume;
when the fresh air temperature is smaller than the minimum value of the preset fresh air temperature range, the fresh air electric two-way adjusting air valve (25) is opened, the proportional-integral adjusting air valve (11) is opened, and the indoor fresh air volume is enabled to be not smaller than the minimum value of the preset indoor fresh air volume.
8. The energy-saving control method for the dual-cold-source combined fresh air conditioning unit according to claim 7, wherein the step of determining the opening states of the fresh air electric two-way adjusting air valve (25) and the proportional-integral adjusting air valve (11) of the dual-cold-source combined fresh air conditioning unit based on the comparison result of the fresh air temperature and the preset fresh air temperature further comprises the following steps:
acquiring a difference value between the pressure of the indoor environment and the external atmospheric pressure;
comparing the difference between the pressure of the indoor environment and the external atmospheric pressure with a preset difference;
the opening degree of the fresh air electric two-way adjusting air valve (25) is adjusted based on the comparison result of the difference value between the pressure of the indoor environment and the external atmospheric pressure and the preset difference value, and the pressure of the indoor environment is larger than the external atmospheric pressure and the difference value between the pressure of the indoor environment and the external atmospheric pressure is kept within the preset difference value range.
9. The energy-saving control method of the dual-cold-source fresh-air combined type air conditioning unit according to claim 8, wherein when the difference between the pressure of the indoor environment and the external atmospheric pressure is greater than a preset difference, the opening of the fresh-air electric two-way regulating air valve (25) is reduced;
when the difference value between the pressure of the indoor environment and the external atmospheric pressure is smaller than the preset difference value, the opening degree of the fresh air electric two-way adjusting air valve (25) is increased.
10. The energy-saving control method for the dual cold source combined fresh air conditioning unit according to any one of claims 1 to 9, wherein a rated frequency of a blower of the dual cold source combined fresh air conditioning unit is further adjusted based on the number of indoor ventilation times, and an indoor air volume is kept within a preset indoor air volume range.
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| CN115406092A (en) * | 2022-08-19 | 2022-11-29 | 广东云下汇金科技有限公司 | Combined type fresh air conditioner control method and device for data center |
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