Fluorine pump heat pipe and evaporation, condensation and compression combined refrigerating system

Abstract

The utility model provides a fluorine pump heat pipe and evaporation, condensation and compression combined refrigerating system which comprises a fluorine pump heat pipe refrigerating loop and an evaporation, condensation and compression combined refrigerating loop. The fluorine pump heat pipe refrigeration loop is formed by sequentially connecting and closing an air-cooled condenser, a liquid storage tank, a fluorine pump, an evaporator and an electronic expansion valve through refrigerant pipelines, and the evaporation condensation compression composite refrigeration loop is formed by sequentially connecting and closing a two-stage indirect evaporation condensation unit, a compressor, a throttling device and the air-cooled condenser through refrigerant pipelines. The fluorine pump heat pipe and the evaporation cooling technology are combined, the fluorine pump heat pipe circulation is preferentially adopted in the operation mode, the evaporation condensation compression refrigeration system and the horizontal cold storage tank supplement cold energy for the insufficient part, different refrigerants can be adopted, and mutual independent combined operation is achieved. An outdoor natural cold source and dry air energy are utilized for a data center heat dissipation system, air conditioner energy consumption is reduced, and operation reliability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning equipment, in particular to a fluorine pump heat pipe and evaporation condensation compression composite refrigeration system. Background Art

[0002] With the rapid development of Internet communication technology, the number and scale of data centers have increased, resulting in an increasingly prominent problem of cooling energy consumption in data centers. It is imperative to propose a solution that effectively reduces the cooling energy consumption of data centers.

[0003] Using heat pipes to achieve natural cooling of data centers using natural cold sources is currently a common energy-saving measure. Among them, fluorine pump heat pipe technology is being researched. When the equipment installation site is limited and the pressure head of the refrigeration system is insufficient, the fluorine pump starts to run to provide power for the system. However, the biggest disadvantage of natural cold sources is that they are significantly intermittent and unstable, which limits their continued use. When the outdoor temperature is high, the cooling capacity and energy efficiency of the fluorine pump heat pipe are low, and the energy-saving benefits are limited.

[0004] The traditional air-cooled air supply method is subject to the large constraints of the data center room itself and the unstable airflow. Evaporative cooling technology plays an important role in the refrigeration industry to achieve the dual carbon goals. Evaporative condensation technology is an air-conditioning technology that uses water as a refrigerant, uses dry air energy to regenerate clean energy, and uses the difference between dry bulb temperature and dew point temperature as the driving force for refrigeration. Evaporative condensation technology is widely used because of its advantages of small footprint, high heat exchange efficiency, low condensation temperature and low energy consumption. Utility Model Content

[0005] The utility model provides a fluorine pump heat pipe and evaporation condensation compression composite refrigeration system to solve the technical problems raised in the background technology.

[0006] The technical solution adopted by the utility model to solve the above technical problems is:

[0007] Fluorine pump heat pipe and evaporation condensation compression compound refrigeration system, including a fluorine pump heat pipe refrigeration circuit and an evaporation condensation compression compound refrigeration circuit;

[0008] The fluorine pump heat pipe refrigeration circuit includes an air-cooled condenser, a liquid sight glass, a cold storage tank, a fluorine pump, a drying filter, an electronic expansion valve, an evaporator and a gas-liquid separator; a first heat exchange coil and a second heat exchange coil are arranged inside the air-cooled condenser, the outlet of the first heat exchange coil is connected to the inlet of the cold storage tank via a liquid sight glass, a first non-return valve and a first electric ball valve, the outlet of the cold storage tank is connected to the inlet of the fluorine pump via a second electric ball valve, a first three-way valve and a third electric ball valve, the outlet of the fluorine pump is connected to the inlet of the evaporator via a fourth electric ball valve, a drying filter and an electronic expansion valve, the outlet of the evaporator is connected to the inlet of the gas-liquid separator, and the gas phase outlet of the gas-liquid separator is connected to the inlet of the first heat exchange coil; a pipeline formed by connecting the first electric ball valve, the cold storage tank and the second electric ball valve is connected in parallel with a bypass provided with a first solenoid valve and a second non-return valve; a pipeline formed by connecting the third electric ball valve, the fluorine pump and the fourth electric ball valve is connected in parallel with a bypass provided with a second solenoid valve and a third non-return valve;

[0009] The evaporative condensing compression refrigeration circuit includes a two-stage indirect evaporative condensing unit, an air-cooled condenser, a liquid storage tank, a compressor and an oil separator; the two-stage indirect evaporative condensing unit is internally provided with a first plate-tube evaporative condenser and a second plate-tube evaporative condenser, the liquid phase outlet of the gas-liquid separator is connected to the inlet of the first plate-tube evaporative condenser via a third solenoid valve, the outlet of the first plate-tube evaporative condenser is connected to the inlet of the liquid storage tank, the outlet of the liquid storage tank is respectively connected to the second electric ball valve and the third electric ball valve via a first three-way valve, the outlet of the second plate-tube evaporative condenser is connected to the air intake of the compressor, the exhaust port of the compressor is connected to the inlet of the oil separator, the gas phase outlet of the oil separator is connected to the inlet of the second heat exchange coil, the liquid phase outlet of the oil separator is connected to the air intake of the compressor via a filter and a capillary tube, and the outlet of the second heat exchange coil is connected to the inlet of the second plate-tube evaporative condenser.

[0010] As a further preference of the utility model, the two-stage indirect evaporative condensing unit includes a shell, and a first plate-tube type evaporative condenser and a second plate-tube type evaporative condenser placed in the shell; the shell has two installation cavities, the first plate-tube type evaporative condenser and the second plate-tube type evaporative condenser are respectively installed in the two installation cavities, the top and side walls of the two installation cavities are installed with exhaust fans and fresh air valves, a first water distributor is provided above the first plate-tube type evaporative condenser, the first water distributor is connected to the liquid storage tank through a first circulating water pump, a second water distributor is provided above the second plate-tube type evaporative condenser, the second water distributor is connected to the liquid storage tank through a second circulating water pump, and a water baffle is provided above the second water distributor.

[0011] As a further optimization of the present invention, the exhaust fan adopts a digital brushless DC outer rotor centrifugal fan, which can intelligently adjust the speed according to the heat load.

[0012] As a further preference of the utility model, the fluorine pump adopts a variable frequency fluorine pump, and two fluorine pumps are set in parallel to back up each other. When one fluorine pump fails, the other fluorine pump works normally without affecting the system operation, further improving the system stability and reliability.

[0013] As a further preferred embodiment of the present invention, the compressor adopts a variable frequency compressor.

[0014] As a further preferred embodiment of the utility model, the evaporator adopts a back plate evaporator, which includes a microchannel heat exchanger, the microchannel equivalent diameter is 10-1000 μm, and an evaporation fan is fixedly connected to the back plate. The back plate evaporator can be directly expanded and multi-connected, and the electronic expansion valve controls the refrigerant distribution, and has a wide flow adjustment function, which can achieve throttling and pressure reduction while having a flow equivalent to the liquid pipe diameter.

[0015] As a further preferred embodiment of the present invention, the refrigerant of the fluorine pump heat pipe refrigeration circuit adopts R410a which is suitable for data centers.

[0016] As a further preferred embodiment of the present invention, the refrigerant of the evaporation-condensation-compression refrigeration circuit is R134a, R22, R410a, etc.

[0017] As a further preferred embodiment of the present invention, a liquid storage tank is installed in front of the inlet of the fluorine pump, which can play a role in liquid storage buffer, improve system stability, improve refrigerant distribution, and avoid cavitation.

[0018] As a further preferred embodiment of the present invention, a temperature sensor is provided at the air inlet of the air-cooled condenser.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] The utility model combines fluorine pump heat pipe technology with evaporative condensation technology to fully utilize outdoor natural cold sources and dry air energy to cool the data center throughout the year, reducing steam compression operation power consumption and time, and has a significant effect on improving energy utilization and reducing data center refrigeration energy consumption and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a fluorine pump heat pipe and evaporation condensation compression composite refrigeration system;

[0022] In the figure, 1. two-stage indirect evaporative condensing unit, 101. exhaust fan, 102. fresh air valve, 103. first plate-tube type evaporative condenser, 104. first water distributor, 105. first circulating water pump, 106. second water distributor, 107. second circulating water pump, 108. second plate-tube type evaporative condenser, 109. water baffle, 110. secondary air, 2. air-cooled condenser, 201. condensing fan, 202. first heat exchange coil, 203. second heat exchange coil, 3. liquid sight glass, 4. cold storage tank, 5. liquid storage tank, 6. fluorine pump, 7. drying filter, 8. Electronic expansion valve, 9. Evaporator, 901. Microchannel heat exchanger, 902. Evaporating fan, 10. Gas-liquid separator, 11. Compressor, 12. Oil separator, 13. First one-way valve, 14. Second one-way valve, 15. Third one-way valve, 16. First electric ball valve, 17. Second electric ball valve, 18. Third electric ball valve, 19. Fourth electric ball valve, 20. First three-way valve, 21. First solenoid valve, 22. Second solenoid valve, 23. Third solenoid valve, 24. Filter, 25. Capillary tube, 26. Fourth one-way valve, 27. Throttling device. DETAILED DESCRIPTION

[0023] The following is a specific implementation of a fluorine pump heat pipe and evaporation condensation compression composite refrigeration system of the present invention in conjunction with the accompanying drawings. However, it should be noted that the implementation of the present invention is not limited to the following implementation.

[0024] Please refer to the attached Figure 1 , fluorine pump heat pipe and evaporation condensation compression composite refrigeration system, including fluorine pump heat pipe refrigeration circuit and evaporation condensation compression composite refrigeration circuit. Specific:

[0025] The fluorine pump heat pipe refrigeration circuit includes an air-cooled condenser 2, a liquid sight glass 3, a cold storage tank 4, a fluorine pump 6, a filter dryer 7, an electronic expansion valve 8, an evaporator 9 and a gas-liquid separator 10. The air-cooled condenser 2 is provided with a first heat exchange coil 202 and a second heat exchange coil 203. The outlet of the first heat exchange coil is connected to the inlet of the cold storage tank 4 through a refrigerant pipeline via a liquid sight glass 3, a first non-return valve 13, and a first electric ball valve 16. The outlet of the cold storage tank 4 is connected to the inlet of the fluorine pump 6 through a refrigerant pipeline via a second electric ball valve 17, a first three-way valve 20, and a third electric ball valve 18. The outlet of the fluorine pump 6 is connected to the inlet of the evaporator 9 through a refrigerant pipeline via a fourth electric ball valve 19, a filter dryer 7, and an electronic expansion valve 8. The outlet of the evaporator 9 is connected to the inlet of the gas-liquid separator 10 through a refrigerant pipeline. The gas phase outlet of the gas-liquid separator 10 is connected to the inlet of the first heat exchange coil 202 through a refrigerant pipeline via a fourth non-return valve 26. The pipeline formed by connecting the first electric ball valve 16, the cold storage tank 4 and the second electric ball valve 17 is connected in parallel with the bypass provided with the first solenoid valve 21 and the second one-way valve 14; the pipeline formed by connecting the third electric ball valve 18, the fluorine pump 6 and the fourth electric ball valve 19 is connected in parallel with the bypass provided with the second solenoid valve 22 and the third one-way valve 15.

[0026] The evaporative condensing compression refrigeration circuit includes a two-stage indirect evaporative condensing unit 1, an air-cooled condenser 2, a liquid storage tank 5, a compressor 11 and an oil separator 12. A first plate-tube type evaporative condenser 103 and a second plate-tube type evaporative condenser 108 are arranged inside the two-stage indirect evaporative condensing unit 1. The liquid phase outlet of the gas-liquid separator 10 is connected to the inlet of the first plate-tube type evaporative condenser 103 through a refrigerant pipeline via a third solenoid valve 23. The outlet of the first plate-tube type evaporative condenser 103 is connected to the inlet of the liquid storage tank 5 through a refrigerant pipeline. The outlet of the liquid storage tank 5 is connected to the second electric ball valve 17 and the third electric ball valve 18 through a refrigerant pipeline via a first three-way valve 20. The second plate-tube type evaporative condenser 108 is connected to the inlet of the first plate-tube type evaporative condenser 103 through a refrigerant pipeline via a third solenoid valve 23. The outlet of the first plate-tube type evaporative condenser 103 is connected to the inlet of the liquid storage tank 5 through a refrigerant pipeline. The outlet of the liquid storage tank 5 is connected to the second electric ball valve 17 and the third electric ball valve 18 through a refrigerant pipeline via a first three-way valve 20. The outlet of the compressor 108 is connected to the air intake port of the compressor 11 through a refrigerant pipeline, the exhaust port of the compressor 11 is connected to the inlet of the oil separator 12 through a refrigerant pipeline, the gas phase outlet of the oil separator 12 is connected to the inlet of the second heat exchange coil 203 through a refrigerant pipeline, the liquid phase outlet of the oil separator 12 is connected to the air intake port of the compressor 11 through a refrigerant pipeline via a filter 24 and a capillary tube 25, and the outlet of the second heat exchange coil 203 is connected to the inlet of the second plate-tube evaporative condenser 108 through a refrigerant pipeline via a throttling device 27.

[0027] In the above structure, the two-stage indirect evaporative condensing unit 1 includes a shell, and a first plate-tube type evaporative condenser 103 and a second plate-tube type evaporative condenser 108 placed in the shell. The shell has two installation cavities, and the first plate-tube type evaporative condenser 103 and the second plate-tube type evaporative condenser 108 are installed in the two installation cavities respectively. The top and side walls of the two installation cavities are both installed with exhaust fans 101 and fresh air valves 102. A first water distributor 104 is provided above the first plate-tube type evaporative condenser 103, and the first water distributor 104 is connected to the liquid storage tank 5 through a first circulating water pump 105. A second water distributor 106 is provided above the second plate-tube type evaporative condenser 108, and the second water distributor 106 is connected to the liquid storage tank 5 through a second circulating water pump 107. A water retaining plate 109 is provided above the second water distributor 106, and a secondary air valve 110 is provided below the second plate-tube type evaporative condenser 108. Exhaust fan 101 adopts a digital brushless DC outer rotor centrifugal fan, which can intelligently adjust the speed according to the heat load.

[0028] Further explanation: the fluorine pump 6 adopts a variable frequency fluorine pump, and two are set in parallel to back up each other. When one fluorine pump fails, the other fluorine pump works normally, which does not affect the operation of the system, and further improves the stability and reliability of the system. The compressor 11 adopts a variable frequency compressor, and the evaporator 9 adopts a back plate evaporator. The back plate evaporator 9 includes a microchannel heat exchanger 901, and the microchannel equivalent diameter is 10~1000μm. An evaporation fan 902 is fixed at the back plate. The back plate evaporator can be directly expanded and multi-connected. The electronic expansion valve controls the distribution of the refrigerant and has a wide flow adjustment function. It can achieve throttling and pressure reduction while having a flow equivalent to the diameter of the liquid pipe. The liquid storage tank 5 is installed in front of the inlet of the fluorine pump 6, which can play a role in liquid storage buffer, improve system stability, improve refrigerant distribution, and avoid cavitation. The top of the air-cooled condenser 2 is a condensing fan 201, and a temperature sensor is arranged at the air inlet of the air-cooled condenser 2.

[0029] To further explain, the refrigerant of the fluorine pump heat pipe refrigeration circuit uses R410a which is suitable for data centers, and the refrigerant of the evaporation condensation compression refrigeration circuit uses R134a, R22 and R410a, etc.

[0030] An operating mode of a fluorine pump heat pipe and evaporation condensation compression composite refrigeration system:

[0031] (1) Fluorine pump natural cold source refrigeration mode:

[0032] When the outdoor temperature Te is lower than the set temperature Taset, and the outdoor environment is low temperature and the natural cooling source is sufficient, stop the compressor, start the fluorine pump and air-cooled condenser, open the first solenoid valve and the first check valve, open the third electric ball valve and the fourth electric ball valve, close the second solenoid valve and the second check valve, close the first electric ball valve and the second electric ball valve, and run the fluorine pump natural cooling source mode. The fluorine pump drives the low-temperature liquid refrigerant in the liquid storage tank to be transported to the back plate evaporator and absorb heat and phase change to vaporize. The refrigerant is in a two-phase flow state and is collected by the gas-liquid separator. A part of the refrigerant returns to the air-cooled condenser to release heat. The refrigerant is condensed from gas to liquid and circulates to the fluorine pump inlet. The other part of the refrigerant is adjusted by the third solenoid valve, and after opening the first fresh air valve, it enters the first plate-tube evaporative condenser and is further cooled and cooled after spraying, and then flows back to the liquid storage tank. The thermal siphon principle and the fluorine pump booster participate in the cycle, and the indoor heat is continuously transferred to the outdoors. The evaporative cooling uses the latent heat of water to take away the heat of the data center, and the data center obtains energy-saving, efficient and adjustable heat dissipation cooling. The fluorine pump, the first exhaust fan and the fourth exhaust fan can be frequency-controlled to control the heat exchange capacity of the air-cooled condenser and the first plate-tube evaporative condenser and the speed of the fluorine pump to match the cooling capacity with the heat load. The electronic expansion valve, i.e., the flow device, is fully opened to efficiently utilize the natural cold source at the low-temperature ambient working temperature. At this time, the compressor does not need to work.

[0033] (2) Evaporation-condensation-compression compound refrigeration mode:

[0034] When the outdoor temperature Te is lower than the set temperature Taset, and the outdoor temperature is in the high temperature of summer and some transitional seasons, the compressor is operated, the second fresh air valve and the secondary return air valve are opened, and the evaporative condensation compression refrigeration is operated. The compressor absorbs and pressurizes the gaseous refrigerant on the upper part of the second plate-tube evaporative condenser, forming refrigerant vapor that enters the air-cooled condenser to release heat. The refrigerant is condensed from gas to liquid and flows back to the liquid storage tank through the throttling mechanism. In this cycle, the two-stage indirect evaporative condensing unit is used to supplement the additional cooling capacity of the natural cold source, reducing the power consumption of the compressor, and the data center obtains stable heat dissipation and cooling. In addition, when the cooling capacity of the data center computer room is insufficient, the first solenoid valve and the first check valve can be closed, the first electric ball valve and the second electric ball valve can be opened, and the emergency cooling capacity of the cold storage tank can be enabled.

[0035] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. Fluorine pump heat pipe and evaporation condensation compression composite refrigeration system, characterized in that: It includes a fluorine pump heat pipe refrigeration circuit and an evaporation condensation compression compound refrigeration circuit; The fluorine pump heat pipe refrigeration circuit comprises an air-cooled condenser (2), a liquid sight glass (3), a cold storage tank (4), a fluorine pump (6), a drying filter (7), an electronic expansion valve (8), an evaporator (9) and a gas-liquid separator (10); a first heat exchange coil (202) and a second heat exchange coil (203) are arranged inside the air-cooled condenser (2); the outlet of the first heat exchange coil is connected to the inlet of the cold storage tank (4) via the liquid sight glass (3), a first non-return valve (13) and a first electric ball valve (16); the outlet of the cold storage tank (4) is connected to the inlet of the fluorine pump (6) via the second electric ball valve (17), a first three-way valve (20) and a third electric ball valve (18); the outlet of the fluorine pump (6) is connected to the inlet of the cold storage tank (4) via the second electric ball valve (17), a first three-way valve (20) and a third electric ball valve (18); The four electric ball valves (19), the drying filter (7), and the electronic expansion valve (8) are connected to the inlet of the evaporator (9); the outlet of the evaporator (9) is connected to the inlet of the gas-liquid separator (10); the gas phase outlet of the gas-liquid separator (10) is connected to the inlet of the first heat exchange coil (202); the pipeline formed by connecting the first electric ball valve (16), the cold storage tank (4) and the second electric ball valve (17) is connected in parallel with a bypass provided with a first electromagnetic valve (21) and a second non-return valve (14); the pipeline formed by connecting the third electric ball valve (18), the fluorine pump (6) and the fourth electric ball valve (19) is connected in parallel with a bypass provided with a second electromagnetic valve (22) and a third non-return valve (15); The evaporative condensing compression refrigeration circuit comprises a two-stage indirect evaporative condensing unit (1), an air-cooled condenser (2), a liquid storage tank (5), a compressor (11) and an oil separator (12); a first plate-tube type evaporative condenser (103) and a second plate-tube type evaporative condenser (108) are arranged inside the two-stage indirect evaporative condensing unit (1); a liquid phase outlet of the gas-liquid separator (10) is connected to an inlet of the first plate-tube type evaporative condenser (103) via a third solenoid valve (23); an outlet of the first plate-tube type evaporative condenser (103) is connected to an inlet of the liquid storage tank (5); and an outlet of the liquid storage tank (5) is connected to an inlet of the liquid storage tank (5) via a first three-way valve. (20) are respectively connected to the second electric ball valve (17) and the third electric ball valve (18), the outlet of the second plate-tube type evaporative condenser (108) is connected to the air intake port of the compressor (11), the exhaust port of the compressor (11) is connected to the inlet of the oil separator (12), the gas phase outlet of the oil separator (12) is connected to the inlet of the second heat exchange coil (203), the liquid phase outlet of the oil separator (12) is connected to the air intake port of the compressor (11) via the filter (24) and the capillary tube (25), and the outlet of the second heat exchange coil (203) is connected to the inlet of the second plate-tube type evaporative condenser (108).

2. The fluorine pump heat pipe and evaporation condensation compression composite refrigeration system according to claim 1 is characterized in that: A two-stage indirect evaporative condensing unit (1) comprises a shell, and a first plate-tube type evaporative condenser (103) and a second plate-tube type evaporative condenser (108) disposed in the shell; the shell has two installation cavities, the first plate-tube type evaporative condenser (103) and the second plate-tube type evaporative condenser (108) are respectively installed in the two installation cavities, the tops and side walls of the two installation cavities are both installed with exhaust fans (101) and fresh air valves (102); a first water distributor (104) is provided above the first plate-tube type evaporative condenser (103), the first water distributor (104) is connected to a liquid storage tank (5) via a first circulating water pump (105); a second water distributor (106) is provided above the second plate-tube type evaporative condenser (108), the second water distributor (106) is connected to a liquid storage tank (5) via a second circulating water pump (107), and a water retaining plate (109) is provided above the second water distributor (106).

3. The fluorine pump heat pipe and evaporation condensation compression composite refrigeration system according to claim 2 is characterized in that: The exhaust fan (101) adopts a digital brushless DC outer rotor centrifugal fan.

4. The fluorine pump heat pipe and evaporation condensation compression composite refrigeration system according to claim 1, characterized in that: The fluorine pump (6) adopts a variable frequency fluorine pump, and two are arranged in parallel to serve as backup for each other.

5. The fluorine pump heat pipe and evaporation condensation compression composite refrigeration system according to claim 1, characterized in that: The compressor (11) is a variable frequency compressor.

6. The fluorine pump heat pipe and evaporation condensation compression composite refrigeration system according to claim 1, characterized in that: The evaporator (9) adopts a back plate evaporator, which includes a microchannel heat exchanger (901), the microchannel equivalent diameter is 10-1000 μm, and an evaporation fan (902) is fixedly connected to the back plate.

7. The fluorine pump heat pipe and evaporation condensation compression composite refrigeration system according to claim 1, characterized in that: The refrigerant of the fluorine pump heat pipe refrigeration circuit adopts R410a which is suitable for data centers.

8. The fluorine pump heat pipe and evaporation condensation compression composite refrigeration system according to claim 1, characterized in that: The refrigerant of the evaporation-condensation-compression refrigeration circuit is R134a, R22 or R410a.

9. The fluorine pump heat pipe and evaporation condensation compression composite refrigeration system according to claim 1, characterized in that: The liquid storage tank (5) is installed in front of the inlet of the fluorine pump (6).

10. The fluorine pump heat pipe and evaporation condensation compression composite refrigeration system according to claim 1, characterized in that: A temperature sensor is provided at the air inlet of the air-cooled condenser (2).

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