Air source CO2 heat pump system for preventing evaporator from frosting by using heat of heat regenerator

Abstract

The invention relates to the technical field of heat pumps, in particular to an air source CO2 heat pump system for preventing an evaporator from frosting by using heat of a heat regenerator. The air source CO2 heat pump system provided by the invention mainly comprises an air source heat pump system body, a heat storage type heat exchange tank and a cooling pump. Through one heat storage type heat exchange tank, on one hand, the regenerative temperature drop of the system is further increased, throttling losses are reduced, and the system performance is improved, and on the other hand, heat of the regenerative temperature drop is used for heat storage defrosting and overheating temperature rise, the heat is prevented from being used for overheating temperature rise to cause large superheat degree and system performance degradation, and meanwhile, heat is provided for preventing frosting of the evaporator. According to the air source CO2 heat pump system provided by the invention, the heat storage type heat exchange tank and the air source CO2 heat pump are combined, so that the performance of the air source CO2 heat pump under the variable load working condition is effectively improved, the problem of frosting on the surface of the evaporator is solved, and stable and efficient heat supply of a unit is achieved. According to the air source CO2 heat pump system provided by the invention, the heat storage type heat exchange tank is simple and compact in structure, good in economical efficiency and beneficial to application and popularization.

Description

technical field [0001] The invention relates to the technical field of heat pumps, in particular to an air source CO that utilizes heat from a regenerator to prevent frosting on an evaporator. 2 heat pump system. Background technique [0002] In order to improve the level of clean heating in the northern region and reduce the emission of air pollutants, 10 departments including the National Development and Reform Commission and the Energy Bureau formulated the "Winter Clean Heating Plan in the Northern Region (2017-2021)", which pointed out that by 2021, electric heating The area is 1.5 billion square meters, of which 500 million square meters are heated by heat pumps. In March 2018, heat pump technology was selected into the latest "National Key Energy-Saving and Low-Carbon Technology Promotion Catalogue" issued by the Development and Reform Commission, and is regarded as a key energy-saving technology for promotion. Traditional freon working fluids have high global warmi...

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Problems solved by technology

[0006] The object of the invention is to propose an air source CO that utilizes the heat of the regenerator to prevent the evaporator from frosting. 2 The heat pump system further increases the temperature drop of the system through a heat storage type heat exchange tank, and at the same time uses the heat of the heat recovery temperature drop for heat storage defrosting and overheating temperature rise to solve system frosting and variable load performance fluctuations performance degradation

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