Defrosting system and method for heat pump type air conditioner

Abstract

The invention relates to a defrosting system and method for a heat pump type air conditioner. The defrosting system comprises a compressor, a four-way directional 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 circulating loop; the heat storage module comprises a phase-change heat storage material, a PTC electric heating rod, a temperature control circuit of the PTC electric heating rod, a refrigerating agent pipeline and a PTC temperature control system; and the PTC temperature control system is used for setting a heating temperature and controlling an overload temperature. According to the defrosting system and method for the heat pump type air conditioner, a variable-frequency compression technology is combined with a phase-change heat storage technology and a PTC electric heating technology for recycling waste heat of the compressor, so that defrosting efficiency is improved; and meanwhile, defrosting can be realized, and temperature of a gas return hole of the compressor is increased, so that heating efficiency is improved.

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] A multi-air conditioner is an air conditioner with an outdoor unit and multiple indoor heat exchangers. It operates in a heating mode in a low temperature environment. When multiple internal units are turned on at the same time, it is often unable to meet the heating capacity requirements of each internal unit. In addition, the outdoor unit heat exchanger is severely frosted when operating in a low temperature environment, which 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, heat pump air conditioners mainly adopt reverse cy...

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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