Low-temperature air-source heat pump system adopting two-stage air supply

Abstract

The invention provides a low-temperature air-source heat pump system adopting two-stage air supply. An evaporator air outlet communicates with a compressor air suction port by a four-way reversing valve, a compressor air exhaust port communicates with a condenser inlet by a four-way reversing valve, a condenser outlet communicates with an economizer and a heat exchange tube in the economizer, an economizer outlet communicates with a compressor air supply port, and first-stage air supply is achieved; a heat exchange tube outlet of the economizer communicates with a heat absorption tube inlet and a heat release tube inlet in a phase change heat accumulator, a heat release tube outlet communicates with the compressor air suction port, and second-stage air supply is achieved; a heat absorptiontube outlet communicates with an expander inlet, and an expander outlet communicates with an evaporator inlet. When the system works at very low ambient temperature, the economizer performs second-stage air supply on a compressor and the phase change heat accumulator, so that cascade deep utilization of waste heat of a condensed refrigerant is achieved, defects of air energy is made up, the stable operation area is expanded, and heating performance of the system at extremely low ambient temperature of subzero 25 DEG C-subzero 30 DEG C is significantly improved.

Description

technical field [0001] The invention relates to an air source heat pump system, in particular to an air source heat pump system for supplementing air. [0002] It belongs to the technical field of energy conservation and environmental protection. Background technique [0003] A heat pump is an energy-saving device that raises heat from a low-temperature heat source to a high-temperature heat source by consuming a part of high-grade energy. Although a certain amount of high-grade energy is consumed, the energy supplied is the high-grade energy consumed and the low energy absorbed. Therefore, heat pump technology is playing an increasingly important role in solving energy problems and environmental pollution problems. The air source heat pump mainly absorbs the heat in the air. It has the advantages of ubiquitous heat sources and a wide range of applications. It is very suitable for Small and medium-sized residential areas, office buildings, or individual users provide heatin...

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Problems solved by technology

[0009] The specific technical problem to be solved by the present invention is that when the air source heat pump operates at low ambient temperature, there is a contradiction between heat supply and demand, high discharge temperature of the compressor and poor defrosting performance. The air source heat pump unit operates at extremely low ambient temperature, and the COP of heating performance is as high as 2.44 or more

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