An air-cooled heat pump evaporation spray system and method thereof controlled by supercooling degree

Abstract

The application discloses a supercooling degree controlled air-cooled heat pump evaporation spraying system and a method thereof. The spraying system comprises a refrigeration system and a spraying system. The atomizing nozzle of the spraying system is aimed at the condenser of the refrigeration system. The spraying system comprises a water storage tank, an electronic water treatment instrument connected with the water outlet of the water storage tank through a pipeline, a constant pressure pump, a counterflow heat exchanger A, a counterflow heat exchanger B and an atomizing nozzle, an ambient temperature sensor arranged outdoors, an exhaust temperature sensor arranged on the pipeline of the exhaust port of the compressor, a pre-valve temperature sensor and a pressure sensor arranged on the pipeline before the electronic expansion valve. The constant pressure pump, the ambient temperature sensor, the exhaust temperature sensor, the pre-valve temperature sensor and the pressure sensor are electrically connected with the controller and are monitored and controlled by the controller. In the above manner, the application determines whether the spraying system needs to be connected according to the supercooling degree, and the condensing area and the evaporation area of the refrigeration system are increased.

Description

Technical Field

[0001] This invention relates to the field of air conditioning system technology, and in particular to an air-cooled heat pump evaporative spray system and method controlled by subcooling. Background Technology

[0002] In cooling mode, air-cooled heat pump units transfer indoor heat to the outdoor environment through a refrigeration cycle, thereby lowering the indoor temperature. Essentially, this is achieved through the properties of the refrigerant in the refrigeration system, where heat is absorbed by the evaporator and dissipated by the condenser. When the outdoor temperature is high, the condenser cannot easily dissipate heat, leading to an increase in condensing pressure and temperature within the refrigeration system. This results in a decrease in system cooling capacity and an increase in operating energy consumption. Furthermore, the increased condensing pressure leads to a larger pressure differential, making the compressor more susceptible to damage. In practice, some air-cooled heat pumps are constrained by their installation environment, with poor heat exchange and ventilation, which can also cause the above situation. When both conditions occur simultaneously, the refrigeration system may struggle to operate, or its cooling capacity output may decrease by more than 50%.

[0003] Currently, there are products on the market that use atomized spray to atomize the condenser, such as... Figure 1 As shown, the atomized water vapor absorbs heat through evaporation, thereby reducing the airflow temperature passing through the condenser and alleviating the above situation. Conventional air-cooled heat pump evaporative spray control intervenes in the system to determine whether to start the spray by monitoring two conditions: ambient temperature and refrigeration system exhaust temperature. The conventional control logic is: spraying starts when T1≥35℃ and T2≥90℃; spraying stops when neither of the above conditions is met. However, this control method has low control accuracy and may result in the spraying not alleviating the situation. In addition, this control method is relatively wasteful and does not have a stable and ideal energy-saving effect.

[0004] Subcooling refers to the difference between the temperature of condensate under a certain pressure and the saturation temperature under the corresponding pressure. When the subcooling is small, it means that the heat of the refrigeration system cannot be dissipated, the system pressure is high, the cooling capacity is reduced, the refrigeration operation consumes more electricity, and timely heat dissipation is required.

[0005] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design an air-cooled heat pump evaporative spray system and method controlled by subcooling. Summary of the Invention

[0006] The main technical problem solved by this invention is to provide an air-cooled heat pump evaporative spray system and method controlled by subcooling. The subcooling is used to determine whether spraying is needed, while ensuring that the system has good subcooling during operation. This increases the condensing and evaporating areas of the refrigeration system, thereby reducing condensing pressure and increasing evaporating pressure, making the system more energy-efficient and effective.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: providing an air-cooled heat pump evaporative spray system and method controlled by subcooling. This air-cooled heat pump evaporative spray system includes a refrigeration system and a spray system. The atomizing nozzle of the spray system is aligned with the condenser of the refrigeration system. The spray system includes a water storage tank connected to an external tap water supply, an electronic water treatment device connected sequentially to the outlet of the water storage tank via a pipe, a constant pressure pump, a counter-current heat exchanger A, a counter-current heat exchanger B, and an atomizing nozzle, an outdoor ambient temperature sensor, an exhaust temperature sensor installed on the compressor exhaust pipe, and a valve inlet temperature sensor and pressure sensor installed on the pipe before the electronic expansion valve. The constant pressure pump, ambient temperature sensor, exhaust temperature sensor, valve inlet temperature sensor, and pressure sensor are electrically connected to and monitored and controlled by a controller. The counter-current heat exchanger A is fitted onto the compressor exhaust pipe, and the counter-current heat exchanger B is fitted onto the compressor suction pipe.

[0008] Preferably, the refrigeration system includes a compressor, a condenser connected to the compressor's exhaust port via a pipe, and an evaporator connected to the other end of the condenser via a pipe. The other end of the evaporator is connected to the compressor's suction port via a pipe. An electronic expansion valve is installed on the pipe between the condenser and the evaporator.

[0009] A method for an air-cooled heat pump evaporative spray system controlled by subcooling, characterized by comprising the following steps:

[0010] S1. The system prioritizes detecting the ambient temperature T1. The controller detects the ambient temperature T1 in real time through the ambient temperature sensor. When T1 ≥ 25℃, the system is in cooling mode by default. At this time, the system performs the next detection and calculation. When T1 < 25℃, the system does not perform detection and calculation.

[0011] S2. Detect exhaust temperature T2. The controller detects the exhaust temperature T2 through the exhaust temperature sensor. If the exhaust temperature T2 is ≥50℃, the refrigeration system is in the on state by default when T2 ≥50℃. At this time, the system will perform the next detection calculation. When T2 <50℃, the system will not perform detection calculation.

[0012] S3. When T1≥25℃ and T2≥50℃, the inlet temperature sensor detects the inlet temperature T3, and the pressure sensor detects the inlet refrigerant pressure P. The controller calculates the refrigerant saturation temperature T under this state based on the inlet refrigerant pressure P, and calculates the subcooling. When T-T3≥t, t is set according to different systems. At this time, it is concluded that the system has a subcooling of more than t, and the spray system does not run. When T-T3<t, the spray system runs.

[0013] S4. The constant pressure pump starts to provide ideal water pressure for the spray system. At the same time, the atomizing nozzles spray and atomize to cool the condenser until the system detects and calculates T-T3≥t, at which point the spraying stops.

[0014] Preferably, t is set to 2°C in step S3.

[0015] Preferably, in step S4, the constant pressure pump pressurizes the water in the water storage tank and sends it to the counter-current heat exchanger A. At this time, the water flows in a counter-current manner to cool the refrigerant in the exhaust pipe, thereby reducing the condensing pressure and exhaust temperature T2 and increasing the condensing area.

[0016] Preferably, in step S4, the water flows into the counter-current heat exchanger B, and the refrigerant in the suction pipe absorbs the heat from the water flow, thereby increasing the evaporation pressure and suction temperature of the refrigeration system and increasing the evaporation area.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] By detecting and calculating the real-time subcooling of the refrigeration system, and combining multiple system operating parameters, it is determined whether the system needs to be connected to the spray system at this time. At the same time, it is ensured that the system has good subcooling during operation. Then, by installing two counter-current heat exchangers on the compressor's exhaust pipe and suction pipe respectively, the condensing area and evaporating area of ​​the refrigeration system are increased, which reduces the condensing pressure and increases the evaporating pressure, making the system more energy-efficient and efficient. Attached Figure Description

[0019] Figure 1 This is a flowchart of a conventional air-cooled heat pump evaporative spray control system.

[0020] Figure 2 This is a flowchart of an air-cooled heat pump evaporative spray system and its method controlled by subcooling.

[0021] Among them, 1. Refrigeration system, 11. Compressor, 12. Condenser, 13. Evaporator, 14. Electronic expansion valve;

[0022] 2. Spray system; 21. Water tank; 22. Electronic water treatment device; 23. Constant pressure pump; 24. Counterflow heat exchanger A; 25. Counterflow heat exchanger B; 26. Atomizing nozzle; 27. Ambient temperature sensor; 28. Exhaust temperature sensor; 29. ​​Valve inlet temperature sensor; 210. Pressure sensor; 211. Controller. Detailed Implementation

[0023] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0024] Please see Figure 2 The embodiments of the present invention include:

[0025] A subcooling-controlled air-cooled heat pump evaporative spray system includes a refrigeration system 1 and a spray system 2. The atomizing nozzle 26 of the spray system 2 is aligned with the condenser 12 of the refrigeration system 1. The spray system 2 includes a water storage tank 21 connected to an external tap water supply, an electronic water treatment device 22 connected in sequence to the outlet of the water storage tank 21 via a pipe, a constant pressure pump 23, a counter-current heat exchanger A 24, a counter-current heat exchanger B 25, and the atomizing nozzle 26, an ambient temperature sensor 27 placed outdoors, and a device installed on the exhaust of the compressor 11. The exhaust temperature sensor 28 on the outlet pipe, the valve inlet temperature sensor 29 and pressure sensor 210 installed on the pipe before the electronic expansion valve 14, the constant pressure pump 23, the ambient temperature sensor 27, the exhaust temperature sensor 28, the valve inlet temperature sensor 29 and pressure sensor 210 are electrically connected to the controller 211 and are monitored and controlled by it, the counterflow heat exchanger A24 is sleeved on the pipe at the exhaust port of the compressor 11, and the counterflow heat exchanger B25 is sleeved on the pipe at the suction port of the compressor 11.

[0026] The refrigeration system 1 includes a compressor 11, a condenser 12 connected to the exhaust port of the compressor 11 via a pipe, and an evaporator 13 connected to the other end of the condenser 12 via a pipe. The other end of the evaporator 13 is connected to the suction port of the compressor 11 via a pipe. An electronic expansion valve 14 is installed on the pipe between the condenser 12 and the evaporator 13.

[0027] A method for an air-cooled heat pump evaporative spray system controlled by subcooling includes the following steps:

[0028] S1. The system prioritizes detecting the ambient temperature T1. The controller 211 detects the ambient temperature T1 in real time through the ambient temperature sensor 27. When T1 ≥ 25℃, the system is in cooling mode by default. At this time, the system performs the next detection calculation. When T1 < 25℃, the system does not perform detection calculation.

[0029] S2. Detecting exhaust temperature T2: The controller 211 detects the exhaust temperature T2 through the exhaust temperature sensor 28. If the exhaust temperature T2 is ≥50℃, the refrigeration system 1 is in the open state by default. The compressor 11 compresses the gaseous refrigerant into a high-temperature and high-pressure gaseous state and sends it to the condenser 12. After being cooled by the condenser 12, it becomes a medium-temperature and high-pressure liquid refrigerant. It is then throttled and depressurized by the electronic expansion valve 14 into a low-temperature and low-pressure gas-liquid mixture (mostly liquid). It then absorbs heat from the air through the evaporator 13 and vaporizes, becoming a gaseous state for refrigeration. The mixture then returns to the compressor 11 to continue compression and refrigeration. At this time, the system performs the next detection calculation. When T2 < 50℃, the system does not perform detection calculation.

[0030] S3. When T1≥25℃ and T2≥50℃, the inlet temperature sensor 29 detects the inlet temperature T3, the pressure sensor 210 detects the inlet refrigerant pressure P, and the controller 211 calculates the refrigerant saturation temperature T under this state based on the inlet refrigerant pressure P, and calculates the subcooling. When T-T3≥t, and t is set to 2℃, t can be set according to different systems. At this time, it is concluded that the system has a subcooling of more than t2℃, and the spray system 2 does not run. When T-T3<t2℃, the spray system 2 runs.

[0031] S4. Constant pressure pump 23 starts to provide ideal water pressure for spray system 2. After the water is pressurized, it is sent to counter-current heat exchanger A24. At this time, the water flows counter-currently to cool the refrigerant in the exhaust pipe, thereby reducing the condensing pressure and exhaust temperature T2 and increasing the condensing area. The water flows into counter-current heat exchanger B25. The refrigerant in the suction pipe absorbs the heat of the water flow, thereby increasing the evaporation pressure and suction temperature of the refrigeration system and increasing the evaporation area. At the same time, the atomizing nozzle 26 sprays and atomizes to cool the condenser until the system detects and calculates T-T3≥2℃, at which point the spraying stops.

[0032] This invention discloses an air-cooled heat pump evaporative spray system and method controlled by subcooling. The subcooling is used to determine whether spraying is needed, while ensuring that the system has good subcooling during operation. This increases the condensing and evaporating areas of the refrigeration system, thereby reducing condensing pressure and increasing evaporating pressure, making the system more energy-efficient and effective.

[0033] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A wind-cooled heat pump evaporative spray system controlled by subcooling, characterized in that: The system includes a refrigeration system and a spray system. The atomizing nozzle of the spray system is aimed at the condenser of the refrigeration system. The spray system includes a water storage tank connected to an external tap water supply, an electronic water treatment device connected to the outlet of the water storage tank via a pipe, a constant pressure pump, a counter-current heat exchanger A, a counter-current heat exchanger B, and an atomizing nozzle, an outdoor ambient temperature sensor, an exhaust temperature sensor installed on the compressor exhaust port pipe, and a valve inlet temperature sensor and a pressure sensor installed on the pipe before the electronic expansion valve. The constant pressure pump, ambient temperature sensor, exhaust temperature sensor, valve inlet temperature sensor, and pressure sensor are electrically connected to and monitored and controlled by the controller. The counter-current heat exchanger A is fitted on the pipe at the compressor exhaust port, and the counter-current heat exchanger B is fitted on the pipe at the compressor suction port. The refrigeration system includes a compressor, a condenser connected to the compressor's exhaust port via a pipe, and an evaporator connected to the other end of the condenser via a pipe. The other end of the evaporator is connected to the compressor's suction port via a pipe. An electronic expansion valve is installed on the pipe between the condenser and the evaporator.

2. A method using a subcooling-controlled air-cooled heat pump evaporative spray system as described in claim 1, characterized in that: Includes the following steps: S1. The system prioritizes detecting the ambient temperature T1. The controller detects the ambient temperature T1 in real time through the ambient temperature sensor. When T1 ≥ 25℃, the system is in cooling mode by default. At this time, the system performs the next detection and calculation. When T1 < 25℃, the system does not perform detection and calculation. S2. Detect exhaust temperature T2. The controller detects the exhaust temperature T2 through the exhaust temperature sensor. If the exhaust temperature T2 is ≥50℃, the refrigeration system is in the on state by default when T2 ≥50℃. At this time, the system will perform the next detection calculation. When T2 <50℃, the system will not perform detection calculation. S3. When T1≥25℃ and T2≥50℃, the inlet temperature sensor detects the inlet temperature T3, and the pressure sensor detects the inlet refrigerant pressure P. The controller calculates the refrigerant saturation temperature T under this state based on the inlet refrigerant pressure P, and calculates the subcooling. When T-T3≥t, t is set according to different systems. At this time, it is concluded that the system has a subcooling of more than t, and the spray system does not run. When T-T3<t, the spray system runs. S4. The constant pressure pump starts to provide ideal water pressure for the spray system. At the same time, the atomizing nozzles spray and atomize to cool the condenser until the system detects and calculates T-T3≥t, at which point the spraying stops.

3. The method for an air-cooled heat pump evaporative spray system controlled by subcooling according to claim 2, characterized in that: In step S3, t is set to 2℃.

4. The method for an air-cooled heat pump evaporative spray system controlled by subcooling according to claim 2, characterized in that: In step S4, the constant pressure pump pressurizes the water in the storage tank and sends it to the counter-current heat exchanger A. At this time, the water flows in a counter-current manner to cool the refrigerant in the exhaust pipe, thereby reducing the condensing pressure and exhaust temperature T2 and increasing the condensing area.

5. A method for an air-cooled heat pump evaporative spray system controlled by subcooling according to claim 2, characterized in that: In step S4, water flows into counter-current heat exchanger B, and the refrigerant in the suction pipe absorbs the heat from the water flow, thereby increasing the evaporation pressure and suction temperature of the refrigeration system and increasing the evaporation area.

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