Trans-critical CO2 heat pump system meeting requirements of high return water temperature and different heating conditions and manipulation method of trans-critical CO2 heat pump system

Abstract

The invention relates to a trans-critical CO2 heat pump system meeting requirements of high return water temperature and different heating conditions and a manipulation method of the trans-critical CO2 heat pump system, belongs to heating circulation technologies of heat pumps, and solves the problem that the conventional CO2 heat pump product cannot meet the high temperature cyclic heating requirement; the heat pump system is formed by combining a subcritical circulation loop taking a high temperature refrigerant as a coolant and a trans-critical circulation loop taking CO2 as a coolant; the two circulation loops share one evaporative cooler; the evaporative cooler serves as the auxiliary gas cooler of the trans-critical circulation loop and further serves as the main evaporator of the subcritical circulation loop; the trans-critical circulation loop supplies circulating hot water to users, wherein the circulating hot water has an outlet water temperature of 70-90 DEG C and a return water temperature of 70-80 DEG C; the subcritical circulation loop can prepare hot water of 50-60 DEG C. According to the trans-critical CO2 heat pump system meeting requirements of high return water temperature and different heating conditions and the manipulation method of the trans-critical CO2 heat pump system, provided by the invention, the efficiency of the trans-critical CO2 heat pump system meeting requirements of high return water temperature cyclic heating conditions is improved, and the technical problem that a single-stage CO2 circulation system cannot realize cyclic heating with the return water temperature of 70 DEG C or above is solved.

Description

Technical field [0001] The invention relates to a heat pump heating cycle technology, in particular to the realization of a highly efficient transcritical CO used for high return water temperature circulating heating 2 system. Background technique [0002] As a natural working fluid without ozone layer destruction and low greenhouse effect, CO 2 It is one of the potential refrigerants to replace Freon in the field of heating and air conditioning. It is developed as CO for industrial and commercial applications such as refrigeration, air conditioning, heating, etc. 2 Heat pump technology has become a hot research topic in domestic universities and enterprises. Especially transcritical CO 2 The circulating heat pump system can produce hot water at a higher temperature than the heat pump system using ordinary freon as the refrigerant (most freon systems have a maximum temperature of 60°C), and there is a demand for heat in this temperature range (hot water Or hot air) occasions, suc...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention and the technical task proposed are to overcome existing CO 2 Heat pump products cannot meet the defects of high-temperature circulation heating requirements, and provide a transcritical CO 2 Heat pump system and its operating method

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