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Heat pump air conditioning system and its control method

A technology of heat pump air conditioner and control method, which is applied to refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of shortening the running time of high energy efficiency under heating conditions, reducing the working energy efficiency of the air conditioning system, and reducing the working performance of the air conditioning system, etc.

Active Publication Date: 2022-05-10
ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for this air conditioning system, since the two outdoor heat exchangers are in the state of evaporating and absorbing heat during heating, the frosting frequency of the two outdoor heat exchangers is basically the same. The system needs to enter the defrosting control for a short period of time in the heating condition, which reduces the working energy efficiency of the air conditioning system, shortens the high-energy-efficiency running time of the heating condition, and reduces the working performance of the air conditioning system

Method used

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  • Heat pump air conditioning system and its control method
  • Heat pump air conditioning system and its control method
  • Heat pump air conditioning system and its control method

Examples

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Effect test

no. 1 example

[0056] The first embodiment: the system cycle of the heat pump air conditioner of the present invention during the heating period is as follows figure 1 As shown, the refrigerant heating device is installed on the compressor discharge port pipeline. After the refrigerant comes out of the compressor discharge port, it passes through the refrigerant heating device, then enters the internal heat exchanger, and enters the first section after passing through the internal heat exchanger. Flow device 4, the throttled refrigerant first enters the heat exchanger 1 of the external unit to exchange heat with the outside air, and the refrigerant after heat exchange is throttled by the second throttling device 5 and then enters the heat exchanger 2 of the external machine, Finally, it returns to the suction port of the compressor through the three-way valve and the four-way valve to complete a heating cycle of the refrigerant. Since the refrigerant coming out of the heat exchanger 1 of the...

no. 2 example

[0081] The second embodiment: the second embodiment of the present invention is to arrange the refrigerant heating device of the first embodiment on the circuit of the suction port of the compressor. In low temperature conditions, when the heat pump air conditioner is heating and heating, the refrigerant heating device is turned on through the control of the system to increase the compressor suction temperature and discharge temperature, so as to inhibit frosting and prolong the heating time. Thermal system cycle as image 3 shown. During the defrosting period, when the heat pump air conditioner is running, turn on the refrigerant heating device to increase the compressor suction temperature and discharge temperature. The high-temperature gas can speed up the defrosting speed of the outdoor unit. During the defrosting period, the system cycle is the same as the scheme 1. There are two defrosting methods ,Such as Figure 4 shown.

no. 3 example

[0082] The third embodiment: the third embodiment of the present invention is that the refrigerant heating device of the first embodiment is arranged on the pipeline between the external unit heat exchanger 2 (ie, the defrosting heat exchanger 7 ) and the three-way valve. In low temperature conditions, when the heat pump air conditioner is heating and heating, through the control of the system, the refrigerant heating device is turned on to increase the compressor suction temperature and discharge temperature, so as to inhibit frosting and prolong the heating time. The system cycle like Figure 7 shown. When the heat pump air conditioner is running during the defrosting period, the refrigerant coming out of the compressor is heated by the refrigerant heating device and then passes through the heat exchanger 2 of the outdoor unit. performance, the system circulation during defrosting is the same as that of scheme 1, and there are two defrosting methods, such as Image 6 shown...

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Abstract

The present application provides a heat pump air conditioning system and a control method thereof. The system includes a compressor, a four-way valve, an indoor heat exchanger, first and second throttling devices, a main heat exchanger, and a defrost heat exchanger, which is located on the air flow upstream side of the main heat exchanger , the second throttling device is connected in series with the defrosting heat exchanger to form a defrosting pipeline. In the heating condition, the refrigerant flows from the exhaust port of the compressor through the indoor heat exchanger, the first throttling device and the main heat exchanger. After throttling through the second throttling device, it enters the defrosting heat exchanger after being throttled by the second throttling device, and then flows back to the compressor; At least one of the frost pipelines is provided with a refrigerant heating device. According to the heat pump air-conditioning system of the present application, the frequency of frosting of the main outdoor heat exchanger can be reduced, and the heat input to the refrigerant of the whole system can be enhanced, so as to prolong the heating time and continuously supply heat to the room during the defrosting period.

Description

technical field [0001] The present application relates to the technical field of air conditioning, in particular to a heat pump air conditioning system and a control method thereof. Background technique [0002] When the heat pump air conditioner is used under low temperature conditions, after running for a period of time, the heat exchanger of the external unit will frost, which increases the thermal resistance and wind resistance, which is not conducive to heat exchange and deteriorates the performance of the air conditioner. In order to ensure the normal operation of the air conditioner, The air conditioner needs to be defrosted. The main defrosting method of the existing air conditioner is to switch the four-way valve and change the direction of the four-way valve. In this way, the indoor fan is stopped during the defrosting process, which not only cannot provide heat to the room, but also because the air flows through the indoor fan. The refrigerant temperature of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B13/00F25B41/40F25D21/06F25D21/08
CPCF25B13/00F25B41/00F25D21/06F25D21/08
Inventor 李丽芳彭光前车雯王喜成王现林杨伟王锐锋孙伟佳叶培龙高仲灶于琦梁凯文
Owner ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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