System and method for defrosting without stopping heat-pump air conditioner

Abstract

The invention relates to a system and a method for defrosting without stopping a heat-pump air conditioner. The system comprises 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 a pipeline to form a circulation loop, wherein the heat storage module comprises a phase-change heat storage material, PTC electrical heating rods, a PTC electrical heating rod temperature control circuit, a refrigerant pipeline and a PTC temperature control system; and the PTC temperature control system is used for setting the heating temperature and controlling the overload temperature. Based on the variable-frequency compression technology, the system and the method provided by the invention are combined with the phase-change heat storage technology and the PTC electrical heating technology, so that waste heat of the compressor can be recycled and the defrosting efficiency can be improved; meanwhile, defrosting can be achieved without stopping the heat-pump air conditioner; and the heating efficiency can be improved by increasing the temperature at an air return port of the compressor.

Description

technical field [0001] The invention relates to a non-stop defrosting system of a heat pump type air conditioner based on a hybrid heat storage technology and a control method of the non-stop defrosting technology, 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 ...

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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