CN114165869A - Fluorine pump system and control method thereof - Google Patents
Fluorine pump system and control method thereof Download PDFInfo
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- CN114165869A CN114165869A CN202111589185.0A CN202111589185A CN114165869A CN 114165869 A CN114165869 A CN 114165869A CN 202111589185 A CN202111589185 A CN 202111589185A CN 114165869 A CN114165869 A CN 114165869A
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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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
- F24F2110/12—Temperature of the outside air
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Signal Processing (AREA)
- Physics & Mathematics (AREA)
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- Mathematical Physics (AREA)
- Sustainable Energy (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a fluorine pump system and a control method thereof, wherein a condenser is a double-coil heat exchanger and comprises a condenser coil A and a condenser coil B; the compressor, the condenser coil A, the electronic expansion valve and the intermediate heat exchanger form a first refrigeration cycle, the indoor tail end, the electric flow regulating valve III, the intermediate heat exchanger, the electric flow regulating valve II, the liquid storage tank and the refrigerant pump form a second refrigeration cycle, and the first refrigeration cycle and the second refrigeration cycle exchange heat in the intermediate heat exchanger; the indoor end, the electric flow control valve IV, the condenser coil B, the electric flow control valve I, the liquid storage tank and the refrigerant pump form a third refrigeration cycle. The invention separates the refrigerant in the first refrigeration cycle of the intermediate heat exchanger from the refrigerant at the tail end in the supply chamber, solves the oil return problem of the refrigeration system under long pipelines and high altitude difference, and has stronger applicability; meanwhile, the invention has three operation modes, and can use the compressor or a natural cold source according to different working conditions, thereby saving energy consumption.
Description
Technical Field
The invention relates to refrigeration equipment, in particular to a fluorine pump system and a control method thereof.
Background
In recent years, relevant regulations for newly building a data center are issued in large cities such as the wide and deep northern cities, the construction scale and the energy consumption index PUE of the data center are strictly controlled, and the electric energy use efficiency of large and ultra-large data centers is not higher than 1.4. The main measure for reducing the energy consumption index PUE of the machine room is to reduce the energy consumption of unnecessary equipment as much as possible, such as machine room air conditioners serving as environmental auxiliary equipment. How to reduce the energy consumption of the air conditioner in the machine room is an increasingly hot topic, and an indirect evaporative cooling system and a full-variable-frequency fluorine pump air conditioner are also in operation. The indirect evaporative cooling system has higher requirements on the basic construction of a machine room, a larger air supply air port is planned in the early stage, and the energy consumption of a compressor of a cold compensation system is larger in high-temperature weather. The full-frequency conversion fluorine pump air conditioner adopts a frequency conversion compressor system and is distributed, but due to the characteristics of the compressor, the oil return problem and the cold quantity attenuation problem of the compressor cannot be avoided under the conditions of an overlong pipeline and a high altitude difference, particularly a high negative altitude difference.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a fluorine pump system with strong applicability, and the invention aims to provide a control method of the fluorine pump system.
The technical scheme is as follows: the invention relates to a fluorine pump system, which comprises an outdoor fluorine pump host and an indoor tail end, wherein the outdoor fluorine pump host comprises an intermediate heat exchanger, a compressor, a condenser, an electronic expansion valve, a liquid storage tank, a refrigerant pump, an electric flow regulating valve II and an electric flow regulating valve III, the compressor, the condenser, the electronic expansion valve and the intermediate heat exchanger form a first refrigeration cycle, the indoor tail end, the electric flow regulating valve III, the intermediate heat exchanger, the electric flow regulating valve II, the liquid storage tank and the refrigerant pump form a second refrigeration cycle, and the first refrigeration cycle and the second refrigeration cycle exchange heat in the intermediate heat exchanger.
In the invention, the intermediate heat exchanger is equivalent to an evaporator for the first refrigeration cycle and is equivalent to a condenser for the second refrigeration cycle, the refrigerant in the first refrigeration cycle and the refrigerant at the tail end in the supply chamber are separated through the intermediate heat exchanger, the oil return problem of the compressor of the refrigeration system under a long pipeline and a high altitude difference is solved, and the high-pressure refrigeration cycle has stronger applicability. The length of the single-pass pipe can reach 150m or even longer, and the negative height difference can reach 50 m. .
Furthermore, the outdoor fluorine pump host machine further comprises an electric flow regulating valve I and an electric flow regulating valve IV, the condenser is a double-coil heat exchanger and comprises a condenser coil A and a condenser coil B, and the condenser coil A is connected into the first refrigeration cycle; the indoor end, the electric flow control valve IV, the condenser coil B, the electric flow control valve I, the liquid storage tank and the refrigerant pump form a third refrigeration cycle.
One path of the condenser is used for condensing the refrigerant of the first refrigeration cycle, the other path of the condenser is used for condensing the refrigerant of the third refrigeration cycle, and the two paths of cycles are relatively independent and mutually backup, so that the safety and the reliability of the system can be improved. When the outdoor temperature is low, the unit refrigerates through the third refrigeration cycle, and the natural cold source is fully utilized through condenser condensation, so that the energy efficiency ratio of the system can be improved, and compared with a conventional air cooling system, the energy efficiency ratio can be improved by more than 50% all the year around.
Furthermore, the electric flow regulating valve adopts a proportional regulating valve, and compared with a common switching value electromagnetic regulating valve, the proportional regulating valve can adapt to the change of load more quickly and accurately regulate and distribute the flow of the refrigerant.
Furthermore, the intermediate heat exchanger adopts a plate heat exchanger or a sleeve heat exchanger, and the plate heat exchanger or the sleeve heat exchanger is small in size, convenient to install and arrange and capable of reducing the size of the outdoor unit.
Further, the number of the indoor ends is one or more, and the indoor ends are connected in parallel.
Further, the indoor end adopts a heat pipe back plate, a heat pipe column, a ceiling type heat pipe or a room level heat pipe.
Further, the air inlet of the condenser is provided with a wet film device, so that the air inlet temperature of the condenser can be further reduced, the condensation efficiency is improved, and a natural cold source is further fully utilized.
The invention also discloses a control method of the fluorine pump system, and the fluorine pump system has three operation modes which are respectively as follows:
in the compressor mode, the electric flow regulating valve I and the electric flow regulating valve IV are closed, the electric flow regulating valve II and the electric flow regulating valve III are opened, and the compressor and the refrigerant pump work;
in the natural cold source mode, the electric flow regulating valve I and the electric flow regulating valve IV are opened, the electric flow regulating valve II and the electric flow regulating valve III are closed, the refrigerant pump works, and the compressor does not work;
the compressor and the natural cold source are in a mixed mode, the electric flow regulating valve I, the electric flow regulating valve II, the electric flow regulating valve III and the electric flow regulating valve IV are all opened, and the compressor and the refrigerant pump work;
according to the outdoor ambient temperature ToutAnd a refrigeration demand ratio Q to determine the system operation mode.
Further, when T ismix＜ToutWhen Q is more than 0, the compressor mode is operated; when T ismix＜Tout＜TfreeWhen Q is more than 0, the compressor is operated to be mixed with a natural cold source; when T isout＜TfreeWhen Q is more than 0, a natural cold source mode is operated; t ismixSwitching temperature, T, for mixed modefreeThe temperature is switched for the natural cold source mode.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: (1) the invention separates the refrigerant in the first refrigeration cycle of the compressor loop from the refrigerant at the end of the supply room through the intermediate heat exchanger, solves the oil return problem of the refrigeration system compressor under long pipelines and high head, the length of the one-way pipe can reach 150m or even longer, the negative head can reach 50m, and the invention has stronger applicability; (2) the invention has three operation modes, can use the compressor or the natural cold source according to different working conditions, and saves energy consumption.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a fluorine pump system comprises an outdoor fluorine pump host and an indoor terminal 12, wherein the outdoor fluorine pump host comprises an intermediate heat exchanger 1, a compressor 2, a condenser 3, an electronic expansion valve 4, a liquid storage tank 5, a refrigerant pump 6, an electric flow regulating valve I8, an electric flow regulating valve II9, an electric flow regulating valve III10 and an electric flow regulating valve IV11, wherein the condenser 3 is a double-coil heat exchanger and comprises a condenser coil a and a condenser coil B. The compressor 2, the condenser coil A, the electronic expansion valve 4 and the intermediate heat exchanger 1 form a first refrigeration cycle, the indoor tail end 12, the electric flow regulating valve III10, the intermediate heat exchanger 1, the electric flow regulating valve II9, the liquid storage tank 5 and the refrigerant pump 6 form a second refrigeration cycle, and the first refrigeration cycle and the second refrigeration cycle exchange heat in the intermediate heat exchanger 1. The indoor end 12, the electric flow rate adjusting valve IV11, the condenser coil B, the electric flow rate adjusting valve I8, the liquid receiver 5, and the refrigerant pump 6 constitute a third refrigeration cycle. An outdoor fan 7 is arranged on the condenser 3, and wet film equipment is arranged at an air inlet of the condenser 3 to reduce the air inlet temperature.
In this embodiment, the intermediate heat exchanger 1 is a plate heat exchanger, and each electric flow control valve is a proportional control valve.
The indoor end 12 is mainly composed of an indoor fan, an evaporator, an electronic expansion valve and a control element. The indoor end 12 may take a variety of forms such as a heat pipe backplane form, a heat pipe train form, a ceiling mounted heat pipe, a room grade heat pipe, and the like. The indoor ends 12 are provided in plural numbers, connected in parallel with each other, and each has an electronic expansion valve, each being independently controlled.
The fluorine pump system has three operation modes, which are respectively:
(1) in the compressor mode, the electric flow control valve I8 and the electric flow control valve IV11 are closed, and the electric flow control valve II9 and the electric flow control valve III10 are opened. The superheated refrigerant gas from the intermediate heat exchanger 1 is pressurized by the compressor 2 and then condensed in the condenser 3. And then the refrigerant enters the intermediate heat exchanger 1 for evaporation and refrigeration after being throttled and reduced in pressure by the electronic expansion valve 4 to form a first refrigeration cycle, the refrigerant in the second refrigeration cycle is cooled in the intermediate heat exchanger 1, the cooled refrigerant passes through the liquid storage tank 5 and then is conveyed to each indoor tail end 12 by the refrigerant pump 6, and after evaporation and heat absorption are carried out at each indoor tail end 12, the refrigerant becomes overheated refrigerant gas and then flows back to the intermediate heat exchanger 1 for circulation.
(2) In the natural cold source mode, the electric flow regulating valve I8 and the electric flow regulating valve IV11 are opened, and the electric flow regulating valve II9 and the electric flow regulating valve III10 are closed. The refrigerant superheated gas which absorbs heat after evaporating from the indoor enters the condenser 3 through the electric flow control valve IV11 to be condensed, then enters the liquid storage tank 5 through the electric flow control valve I8, and then is conveyed to each indoor terminal 12 through the refrigerant pump 6.
(3) The compressor and the natural cold source are in a mixed mode, and the electric flow regulating valve I8, the electric flow regulating valve II9, the electric flow regulating valve III10 and the electric flow regulating valve IV11 are all opened. The refrigerant that has absorbed heat and evaporated from each indoor end 12 is partially condensed by the intermediate heat exchanger 1 and partially condensed by the condenser 3, and then mixed into the accumulator tank 5 and sent to each indoor end 12 by the refrigerant pump 6.
Each indoor tail end 12 is in communication connection with the outdoor fluorine pump host through RS485 and is controlled in a decoupling mode. The outdoor fluorine pump host reads the parameters of each indoor tail end 12 through RS485 communication, controls the start, stop and frequency of the compressor 2 according to the operation mode and the indoor cold quantity requirement, and adjusts the rotating speed of the outdoor fan 7 according to different modes; the indoor end 12 calculates the refrigeration requirement according to the return air temperature of the respective control area, and adjusts the rotating speed of the indoor fan at the end and the opening of the electronic expansion valve.
The refrigerant pump 6 may be a fixed frequency pump or an inverter pump, and when an inverter pump is used, the frequency of the pump is adjusted by controlling the pressure difference of the system.
The compressor 2 is a variable frequency compressor, and the operating frequency of the compressor is adjusted according to the operating mode and the refrigeration requirement.
The control method of the fluorine pump system comprises the following steps:
setting mixed mode switching temperature TmixNatural cold source mode switching temperature TfreeTemperature T of refrigerant entering indoor end 12set. According to the outdoor ambient temperature ToutAnd a refrigeration demand ratio Q for detecting a temperature T by a refrigerant introduced into the indoor end 12inAnd a set temperature TsetAnd (6) performing calculation.
When T ismix＜ToutAnd Q > 0, the compressor mode is operated. At the moment, the frequency of the compressor is adjusted according to the refrigeration requirement, and the frequency of the compressor is the lowest rotating speed plus (the highest rotating speed-the lowest rotating speed) Q; the rotating speed of the outdoor fan 7 is adjusted according to the exhaust pressure of the compressor, and the opening degree of the electronic expansion valve 4 is adjusted according to the superheat degree by detecting the suction temperature and the suction pressure. The refrigerant pump 6 is adjusted according to the pump inlet-outlet pressure difference.
When T ismix＜Tout＜TfreeAnd when Q is larger than 0, the compressor is operated to be mixed with a natural cold source. Specifically, when Q > 50%, the compressor 2 is first operated at 50% of the rotation speed, and the electric flow rate adjustment valve I8 and the electric flow rate adjustment valve IV11 are adjusted according to the temperature of the refrigerant cooled by the condenser 3 in the third refrigerant cycle. When Q is less than 50%, the natural cold source mode is started at first, if the refrigeration requirement is met, the outlet liquid temperature meets the set temperature requirement, and at the moment, the natural cold source mode is only adopted for operation, and the compressor 2 is not started. When the rotating speed of the outdoor fan 7 is 100% and the refrigeration demand does not fall, the compressor mode is started at the moment.
When T isout＜TfreeAnd when Q is more than 0, the natural cold source mode is operated. At this time, the compressor 2 is closed, the electric flow control valve I8 and the electric flow control valve IV11 are fully opened, and the outdoor fan 7 is adjusted according to the refrigeration demand Q. When the cooling demand Q of the outdoor fan 7 is still decreasing for the lowest rotation speed, the electric flow control valve I8 and the electric flow control valve IV11 are gradually turned down. The purpose of doing so is to give priority to fan regulation, reduce 7 rotational speeds of outdoor fan, reduce fan power as far as possible, provide system energy efficiency.
The present invention is described below as applied to a data center as an example.
The indoor end 12 adopts a heat pipe back plate or a heat pipe row room and is close to the server for air outlet. The air return temperature of the unit is high, and the heat exchange efficiency is high. When the outdoor temperature is 20 ℃, the mixing mode can be started; when the outdoor temperature is 10 ℃, the natural cold source mode can be started; the power of the compressor is generally over 10kW, and when a natural cold source mode is adopted, the compressor stops working, only the outdoor fan 7 works, the power is 1-2kW, and the energy is saved by 80%.
Claims (9)
1. A fluorine pump system comprising an outdoor fluorine pump main unit and an indoor end (12), characterized in that: the outdoor fluorine pump host comprises an intermediate heat exchanger (1), a compressor (2), a condenser (3), an electronic expansion valve (4), a liquid storage tank (5), a refrigerant pump (6), an electric flow regulating valve II (9) and an electric flow regulating valve III (10), wherein the compressor (2), the condenser (3), the electronic expansion valve (4) and the intermediate heat exchanger (1) form a first refrigeration cycle, an indoor terminal (12), the electric flow regulating valve III (10), the intermediate heat exchanger (1), the electric flow regulating valve II (9), the liquid storage tank (5) and the refrigerant pump (6) form a second refrigeration cycle, and the first refrigeration cycle and the second refrigeration cycle exchange heat in the intermediate heat exchanger (1).
2. The fluorine pump system of claim 1, wherein: the outdoor fluorine pump host machine further comprises an electric flow regulating valve I (8) and an electric flow regulating valve IV (11), the condenser (3) is a double-coil heat exchanger and comprises a condenser coil A and a condenser coil B, and the condenser coil A is connected into a first refrigeration cycle; the indoor end (12), the electric flow control valve IV (11), the condenser coil B, the electric flow control valve I (8), the liquid storage tank (5) and the refrigerant pump (6) form a third refrigeration cycle.
3. The fluorine pump system of claim 2, wherein: the electric flow control valve adopts a proportional control valve.
4. The fluorine pump system of claim 1, wherein: the intermediate heat exchanger (1) adopts a plate heat exchanger or a sleeve heat exchanger.
5. The fluorine pump system of claim 1, wherein: the number of the indoor terminals (12) is one or more, and the plurality of indoor terminals (12) are connected in parallel.
6. The fluorine pump system of claim 1, wherein: the indoor end (12) is in the form of a heat pipe back plate, a heat pipe column, a ceiling type heat pipe or a room-level heat pipe.
7. The fluorine pump system of claim 1, wherein: and a wet film device is arranged at the air inlet of the condenser (3).
8. The method of controlling a fluorine pump system according to claim 2, wherein: the fluorine pump system has three operation modes, which are respectively:
in a compressor mode, an electric flow regulating valve I (8) and an electric flow regulating valve IV (11) are closed, an electric flow regulating valve II (9) and an electric flow regulating valve III (10) are opened, and a compressor (2) and a refrigerant pump (6) work;
in a natural cold source mode, an electric flow regulating valve I (8) and an electric flow regulating valve IV (11) are opened, an electric flow regulating valve II (9) and an electric flow regulating valve III (10) are closed, a refrigerant pump (6) works, and a compressor (2) does not work;
the compressor and the natural cold source are in a mixed mode, the electric flow regulating valve I (8), the electric flow regulating valve II (9), the electric flow regulating valve III (10) and the electric flow regulating valve IV (11) are all opened, and the compressor (2) and the refrigerant pump (6) work;
according to the outdoor ambient temperature ToutAnd a refrigeration demand ratio Q to determine the system operation mode.
9. The control method according to claim 8, characterized in that: when T ismix＜ToutWhen Q is more than 0, the compressor mode is operated; when T ismix＜Tout＜TfreeWhen Q is more than 0, the compressor is operated to be mixed with a natural cold source; when T isout＜TfreeWhen Q is more than 0, a natural cold source mode is operated; t ismixSwitching temperature, T, for mixed modefreeThe temperature is switched for the natural cold source mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589185.0A CN114165869A (en) | 2021-12-23 | 2021-12-23 | Fluorine pump system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111589185.0A CN114165869A (en) | 2021-12-23 | 2021-12-23 | Fluorine pump system and control method thereof |
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| CN114165869A true CN114165869A (en) | 2022-03-11 |
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| CN202111589185.0A Pending CN114165869A (en) | 2021-12-23 | 2021-12-23 | Fluorine pump system and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606807A (en) * | 2021-08-02 | 2021-11-05 | 苏州黑盾环境股份有限公司 | Air conditioning system and control method |
| CN115789911A (en) * | 2022-11-17 | 2023-03-14 | 中国联合网络通信集团有限公司 | Air conditioner control method and device, electronic equipment and storage medium |
-
2021
- 2021-12-23 CN CN202111589185.0A patent/CN114165869A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606807A (en) * | 2021-08-02 | 2021-11-05 | 苏州黑盾环境股份有限公司 | Air conditioning system and control method |
| CN115789911A (en) * | 2022-11-17 | 2023-03-14 | 中国联合网络通信集团有限公司 | Air conditioner control method and device, electronic equipment and storage medium |
| CN115789911B (en) * | 2022-11-17 | 2024-05-03 | 中国联合网络通信集团有限公司 | Air conditioner control method and device, electronic equipment and storage medium |
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