Auxiliary heat-tracing ultra-low temperature air source heat pump air conditioner

Abstract

The invention provides an auxiliary heat tracing ultralow temperature air heat pump air-conditioning, consisting of an air source heat pump system and an heat pump auxiliary heat tracing system, wherein the air source heat pump system consists of a compressor, a four-way reversing valve, an indoor heat exchanger, an expansion valve and an outdoor heat exchanger; the heat pump auxiliary heat tracing system consists of a compressor, a four-way reversing valve, an auxiliary heat tracing heat exchanger, an expansion valve and an outdoor heat exchanger. The heat pump air conditioning is also provided with a feedback auxiliary heating circuit. The invention adopts an air source heat pump system and is provided with a heat pump auxiliary heat tracing system, thereby the air source heat pump can effectively realize the cooling operation in the environment of ultra-low temperature below 20 degrees centigrade below zero; and in the environment of low temperature above 20 degrees centigrade below zero, the operation is shifted into the independent heating operation of the air source heat pump system and is reversed through the four-way reversing valve to realize the defrosting operation and the summer cooling operation. The feedback auxiliary heating circuit of the invention improves the suction temperature and the EER of the compressor of the auxiliary heat tracing system, thus improving the heating efficiency of the air conditioning system.

Description

technical field [0001] The invention relates to an air source heat pump air conditioner, in particular to an auxiliary heating type ultra-low temperature air source heat pump air conditioner. Background technique [0002] In order to be able to effectively heat in an ultra-low temperature environment below -20°C, the existing technology uses a cascaded heat pump system, that is, a two-stage heat pump system that is coupled by a low-temperature heat pump system at the front stage and a high-temperature heat pump system at the rear stage through a condensing evaporator. Although the two-stage heat pump system theoretically solves the heating problem in the ultra-low temperature environment below -20°C, it is difficult to become a practical air-conditioning product, because the existing cascade heat pump can only operate in two-stage cascade heating, and the outdoor environment The temperature changes. When the temperature is above -20°C, the energy efficiency ratio of the two-...

AI Technical Summary

Problems solved by technology

Although the two-stage heat pump system theoretically solves the heating problem in the ultra-low temperature environment below -20°C, it is difficult to become a practical air-conditioning product, because the existing cascade heat pump can only operate in two-stage cascade heating, and the outdoor environment The temperature is changing. When the temperature is above -20°C, the energy efficiency ratio of the two-stage cascade operation mode will be greatly reduced, and the meaning of the two-stage cascade operation will be lost.

In addition, the cascade operation of the two-stage heat pump also requires defrosting, and as an air conditioner, it should be able to perform independent cooling operation in summer. The cascade air source heat pump in the prior art cannot realize the above-mentioned defrosting and summer cooling operation conversion.

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