A heat pump air conditioner defrosting system and method

Abstract

The invention relates to a defrosting system and method for a heat pump air conditioner, comprising a compressor, a four-way reversing valve, an indoor heat exchanger, a throttling device, an outdoor heat exchanger and a heat storage module which are sequentially connected through pipelines and form a circulation loop , the heat storage module includes a phase change heat storage material, a PTC electric heating rod, a PTC electric heating rod temperature control circuit, a refrigerant pipeline and a PTC temperature control system, and the PTC temperature control device is used to set the heating temperature and control the overload temperature . The heat pump type air conditioner defrosting system and method of the present invention solves the problem that the system and control method are based on the frequency conversion compression technology, combined with the phase change heat storage technology and the PTC electric heating technology, and the waste heat of the compressor is recovered and reused, and the efficiency is improved. At the same time, defrosting can be realized, and the heating efficiency can be improved by increasing the temperature of the air return port of the compressor.

Description

technical field [0001] The invention relates to a heat pump type air conditioner defrosting system based on a hybrid heat storage technology and a defrosting technology control method thereof, belonging to the field of refrigeration and air conditioning. Background technique [0002] One-to-many air conditioners are air conditioners with one outdoor unit and multiple indoor heat exchangers. They operate in heating mode in low-temperature environments. When multiple indoor units are turned on at the same time, they often cannot meet the heating capacity requirements of each indoor unit. In addition, when operating in a low temperature environment, the heat exchanger of the outdoor unit is seriously frosted, and the frost will increase the wind resistance of the outdoor unit, resulting in a decrease in the heat transfer coefficient of the heat exchanger and further weakening the heating capacity of the multi-air conditioner. [0003] At present, the heat pump air conditioner m...

AI Technical Summary

Problems solved by technology

[0002] One-to-many air conditioners are air conditioners with one outdoor unit and multiple indoor heat exchangers. They operate in heating mode in low-temperature environments. When multiple indoor units are turned on at the same time, they often cannot meet the heating capacity requirements of each indoor unit.

In addition, when operating in a low temperature environment, the heat exchanger of the outdoor unit is severely frosted, and the frost will increase the wind resistance of the outdoor unit, resulting in a decrease in the heat transfer coefficient of the heat exchanger and further weakening the heating capacity of the multi-air conditioner.

[0003] At present, the heat pump air conditioner mainly adopts the reverse cycle defrosting control method, which needs to consume part of the indoor heat and reduce the thermal comfort of the room. In order to solve this key technical problem, this invention proposes a systematic solution, combining phase change storage Thermal technology and PTC electric heating technology, recycle and reuse the high temperature part of the outdoor compressor shell, preheat the return air through waste heat, increase the temperature of the return air, thereby increasing the exhaust temperature, and optimize the overall The heating capacity of multiple air conditioners makes it suitable for lower outdoor environments

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