Air-cooled heat pump evaporation spraying system controlled through supercooling degree

Abstract

The utility model discloses an air-cooled heat pump evaporation spraying system controlled by supercooling degree, which comprises a refrigerating system and a spraying system, and an atomizing nozzle of the spraying system is aligned with a condenser of the refrigerating system. The spraying system comprises a water storage tank, an electronic water treatment instrument, a constant pressure pump, a countercurrent heat exchanger A, a countercurrent heat exchanger B and an atomizing nozzle which are sequentially connected with a water outlet of the water storage tank through a pipeline, an outdoor environment temperature sensor, and an exhaust temperature sensor mounted on an exhaust port pipeline of the compressor; the upstream temperature sensor and the pressure sensor are installed on a pipeline in front of the electronic expansion valve, and the constant pressure pump, the environment temperature sensor, the exhaust temperature sensor, the upstream temperature sensor and the pressure sensor are electrically connected with the controller and are monitored and controlled by the controller. By means of the mode, whether spraying is needed or not is determined according to the degree of supercooling, and the condensation area and the evaporation area of a refrigerating system are increased.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning systems, in particular to an air-cooled heat pump evaporative spray system controlled by supercooling. Background Art

[0002] In cooling mode, the air-cooled heat pump unit transfers the indoor ambient heat to the outdoor environment through the refrigeration cycle, thereby lowering the indoor temperature. Its essence is to complete the conversion of heat energy by absorbing heat in the system evaporator and dissipating heat in the condenser through the characteristics of the refrigerant in the refrigeration system. When the outdoor ambient temperature is high, it is not easy for the condenser to dissipate heat, and it also leads to an increase in the condensing pressure and condensing temperature in the refrigeration system, resulting in a decrease in the system's cooling capacity and an increase in operating energy consumption. At the same time, due to the increase in condensing pressure, the pressure difference of the refrigeration system operation becomes larger, which is more likely to cause damage to the system compressor. In practice, some air-cooled heat pumps are restricted by the installation scenario, and their heat exchange and ventilation conditions are poor, which can also cause the above situation. When these two conditions occur at the same time, the refrigeration system is difficult to operate or its cooling capacity output is attenuated by more than 50%.

[0003] Currently, there are some methods on the market that use atomization spray on the condenser, such as Figure 1 As shown, the atomized water vapor absorbs heat by evaporation to reduce the temperature of the air flow passing through the condenser, thereby alleviating the above situation. Conventional air-cooled heat pump evaporative spray control intervenes in the system to start spraying by monitoring the two conditions of ambient temperature and refrigeration system exhaust temperature. The conventional control logic is: when T1 ≥ 35 ° C and T2 ≥ 90 ° C, the spray runs; when the above two conditions are not met, the spray is stopped. This control method has low control accuracy and may result in the situation that the current situation is not alleviated after spraying. At the same time, 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 condensed water 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 attenuated, the refrigeration operation consumes electricity, and the heat needs to be dissipated in time.

[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 controlled by supercooling. Utility Model Content

[0006] The main technical problem solved by the utility model is to provide an air-cooled heat pump evaporative spray system controlled by supercooling, which determines whether spray access is needed through supercooling, while ensuring that the system has good supercooling during operation, increasing the condensing area and evaporating area of ​​the refrigeration system, reducing the condensing pressure and increasing the evaporating pressure, making the system operation more energy-efficient and efficient.

[0007] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide an air-cooled heat pump evaporative spray system controlled by supercooling, the air-cooled heat pump evaporative spray system controlled by supercooling 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 tap water, an electronic water treatment instrument connected to the water outlet of the water storage tank in sequence through a pipeline, a constant pressure pump, a countercurrent heat exchanger A, a countercurrent heat exchanger B and an atomizing nozzle, an ambient temperature sensor placed outdoors, an exhaust temperature sensor installed on the compressor exhaust pipe, a valve front temperature sensor and a pressure sensor installed on the electronic expansion valve front pipe, the constant pressure pump, the ambient temperature sensor, the exhaust temperature sensor, the valve front temperature sensor and the pressure sensor are respectively electrically connected to the controller and monitored and controlled by it, the countercurrent heat exchanger A is sleeved on the pipe at the compressor exhaust port, and the countercurrent heat exchanger B is sleeved on the pipe at the compressor suction port.

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

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] By detecting and calculating the real-time subcooling of the refrigeration system and combining multiple operating parameters of the system, it is determined whether the system needs spray access at this time, while ensuring that the system has a good subcooling during operation. Then, two countercurrent heat exchangers are installed on the exhaust pipe and suction pipe of the compressor respectively, thereby increasing the condensing area and evaporating area of ​​the refrigeration system, reducing the condensing pressure and increasing the evaporating pressure, making the system operation more energy-efficient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the flow chart of the conventional air-cooled heat pump evaporative spray control system.

[0012] Figure 2 The figure is a flow chart of an air-cooled heat pump evaporative spray system controlled by subcooling.

[0013] Among them, 1. refrigeration system, 11. compressor, 12. condenser, 13. evaporator, 14. electronic expansion valve;

[0014] 2. Spray system, 21. Water storage tank, 22. Electronic water treatment instrument, 23. Constant pressure pump, 24. Countercurrent heat exchanger A, 25. Countercurrent heat exchanger B, 26. Atomizing nozzle, 27. Ambient temperature sensor, 28. Exhaust temperature sensor, 29. Pre-valve temperature sensor, 210. Pressure sensor, 211. Controller. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0016] See also Figure 2 , the utility model embodiment includes:

[0017] A wind-cooled heat pump evaporative spray system controlled by supercooling, comprising a refrigeration system 1 and a spray system 2, wherein an atomizing nozzle 26 of the spray system 2 is aimed at a condenser 12 of the refrigeration system 1, and the spray system 2 comprises a water storage tank 21 connected to tap water, an electronic water treatment instrument 22 connected to a water outlet of the water storage tank 21 in sequence through a pipeline, a constant pressure pump 23, a countercurrent heat exchanger A24, a countercurrent heat exchanger B25 and an atomizing nozzle 26, an ambient temperature sensor 27 placed outdoors, and an exhaust gas temperature sensor installed at the compressor 11. The exhaust temperature sensor 28 on the outlet pipe, the pre-valve temperature sensor 29 and the pressure sensor 210 installed on the pipe in front of the electronic expansion valve 14, the constant pressure pump 23, the ambient temperature sensor 27, the exhaust temperature sensor 28, the pre-valve temperature sensor 29 and the pressure sensor 210 are respectively electrically connected to the controller 211 and monitored and controlled by it, the countercurrent heat exchanger A24 is sleeved on the pipe at the exhaust port of the compressor 11, and the countercurrent heat exchanger B25 is sleeved on the pipe at the suction port of the compressor 11.

[0018] The refrigeration system 1 includes a compressor 11, a condenser 12 connected to the exhaust port of the compressor 11 through a pipeline, and an evaporator 13 connected to the other end of the condenser 12 through a pipeline. The other end of the evaporator 13 is connected to the air intake port of the compressor 11 through a pipeline. An electronic expansion valve 14 is installed on the pipeline between the condenser 12 and the evaporator 13.

[0019] The utility model discloses an air-cooled heat pump evaporative spray system controlled by supercooling, which comprises the following steps when in operation:

[0020] S1, the system first detects the ambient temperature T1, the controller 211 detects the ambient temperature T1 in real time through the ambient temperature sensor 27, when T1 ≥ 25 ° C, the system is in cooling mode by default, and the system performs the next detection calculation, when T1 < 25 ° C, the system does not perform detection calculation;

[0021] S2, detect the exhaust temperature T2, the controller 211 detects the exhaust temperature T2 through the exhaust temperature sensor 28, detects the exhaust temperature T2 ≥ 50 ° C, and by default T2 ≥ 50 ° C, the refrigeration system 1 is in the open state, the compressor 11 compresses the gaseous refrigerant into a high-temperature and high-pressure gas, and sends it to the condenser 12, and after the condenser 12 dissipates heat and cools, it becomes a medium-temperature and high-pressure liquid refrigerant, and is throttled and reduced in pressure by the electronic expansion valve 14 to become a low-temperature and low-pressure gas-liquid mixture (more liquid), and passes through the evaporator 13 to absorb heat in the air and vaporize, becoming a gas, and refrigeration is performed, and then returns to the compressor 11 to continue compression, and continues to refrigerate in a cycle. At this time, the system performs the next step of detection and calculation. When T2 < 50 ° C, the system does not perform detection and calculation;

[0022] S3, when T1 ≥ 25 ℃ and T2 ≥ 50 ℃, the temperature sensor 29 before the valve detects the temperature T3 before the valve, the pressure sensor 210 detects the refrigerant pressure value P before the valve, and the controller 211 calculates the refrigerant saturation temperature T and the subcooling degree according to the refrigerant pressure value P before the valve. When T-T3 ≥ t, 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 degree above t2 ℃, and the spray system 2 does not operate. When T-T3 < t2 ℃, the spray system 2 operates.

[0023] S4, the constant pressure pump 23 is started to provide ideal water pressure for the spray system 2. The water is pressurized and sent to the countercurrent heat exchanger A24. At this time, the water countercurrently cools the refrigerant in the exhaust pipe, thereby reducing the condensation pressure and exhaust temperature T2 and increasing the condensation area. The water flows into the countercurrent heat exchanger B25, and 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℃, and the spraying stops.

[0024] The utility model discloses an air-cooled heat pump evaporative spray system controlled by supercooling, which determines whether spray access is needed through supercooling and ensures good supercooling when the system is running, thereby increasing the condensing area and evaporating area of ​​the refrigeration system, reducing the condensing pressure and increasing the evaporating pressure, making the system operation more energy-saving and efficient.

[0025] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An air-cooled heat pump evaporative spray system controlled by subcooling, characterized in that: It comprises a refrigeration system and a spray system, wherein the atomizing nozzle of the spray system is aimed at the condenser of the refrigeration system, the spray system comprises a water storage tank connected to an external tap water, an electronic water treatment instrument connected to the water outlet of the water storage tank in sequence through a pipeline, a constant pressure pump, a countercurrent heat exchanger A, a countercurrent heat exchanger B and an atomizing nozzle, an ambient temperature sensor placed outdoors, an exhaust temperature sensor installed on the compressor exhaust pipe, a pre-valve temperature sensor and a pressure sensor installed on the pre-pipe of 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 respectively electrically connected to the controller and monitored and controlled by it, the countercurrent heat exchanger A is sleeved on the pipe at the compressor exhaust port, and the countercurrent heat exchanger B is sleeved on the pipe at the compressor suction port.

2. The air-cooled heat pump evaporative spray system controlled by subcooling according to claim 1, characterized in that: The refrigeration system includes a compressor, a condenser connected to the compressor exhaust port through a pipeline, and an evaporator connected to the other end of the condenser through a pipeline. The other end of the evaporator is connected to the compressor suction port through a pipeline. An electronic expansion valve is installed on the pipeline between the condenser and the evaporator.

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