CO2 heat pump system and method for improving thermal performance

Abstract

The invention relates to a CO2 heat pump system and a method for improving thermal performance, and belongs to the field of heating and ventilation. The system comprises a gas cooler and a plate heatexchanger. The plate heat exchanger comprises a first inlet, a second inlet, a first outlet and a second outlet. The gas cooler comprises a third inlet, a fourth inlet, a third outlet and a fourth outlet. The first inlet communicates with high-temperature return water. The first outlet is connected with an inlet of a three-way valve through a circulating water pump. The first outlet is provided with a temperature measuring device. One outlet of the three-way valve is connected with the third inlet. The third outlet is connected with the second inlet. The second outlet discharges hot water. Thefourth inlet and the fourth outlet are sequentially connected with a condensing agent outlet and a condensing agent inlet. The other outlet of the three-way valve and the third inlet are sequentiallyconnected with an auxiliary refrigerating fluid inlet and an auxiliary refrigerating fluid outlet. According to the CO2 heat pump system and the method for improving the thermal performance, the temperature of the return water is reduced, the temperature difference of the two sides of the gas cooler is increased, the frosting time interval is prolonged, and the system performance is overall improved.

Description

technical field [0001] The invention relates to a heat pump system, especially a CO 2 The heat pump system also relates to a method for improving thermal performance, and belongs to the field of heating and ventilation. Background technique [0002] Under the dual pressure of energy crisis and environmental crisis, realizing the sustainable development of building energy consumption and building a clean and low-carbon energy system has become the focus of attention. Due to the natural working substance CO 2 As a refrigerant, it has the characteristics of energy saving and environmental protection. Therefore, CO 2 Heat pump systems are widely used. [0003] However, in cold regions, heating with CO 2 There are many problems in the operation of the heat pump system. One of the biggest problems is that the return water temperature is high and the coefficient of performance is low, so the inlet water temperature of the air cooler is too high, resulting in CO 2 Refrigerant ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the first object of the present invention is to provide a CO 2 The heat pump system improves the structure of the traditional air cooler and solves the problem of too high inlet water temperature of the air cooler under low temperature conditions, thereby improving the thermal performance of the system

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