CO2 heating heat pump system

Abstract

The invention discloses a CO2 heating heat pump system. The CO2 heating heat pump system comprises a first compressor, a second compressor, an ejector, a gas cooler, a first expansion valve, a flashing tank, a second expansion valve and an evaporator; an exhaust port of the first compressor is connected with a first inlet of the ejector; an exhaust port of the second compressor is connected with a second inlet of the ejector; an outlet of the ejector is connected with a working medium inlet of the gas cooler; a working medium outlet of the gas cooler is connected with an inlet of the first expansion valve; an outlet of the first expansion valve is connected with an inlet of the flashing tank; a gas outlet of the flashing tank is connected with an inlet of the second compressor; and a liquid outlet of the flashing tank is connected with an inlet of the first compressor by the second expansion valve and the evaporator. The CO2 heating heat pump system applies two parallel compressors to reduce the performance attenuation problem of a CO2 heat pump at a high water return temperature (50 DEG C), uses the ejector for reducing the power consumption of the two compressors to improve the system energy efficiency, and is provided with an air return U-shaped pipe with an oil return hole in the flashing tank to guarantee an air sucking state of the compressors in an air state.

Description

【Technical field】 [0001] The invention belongs to the technical field of mechanical engineering and relates to a CO 2 Compound heat pump system. 【Background technique】 [0002] Mechanical compression heat pump technology uses a small amount of high-grade mechanical energy to complete the cycle of refrigerant in the system by using a compressor, extract heat from a lower temperature heat source and heat other media, that is, by consuming a small amount of high-grade energy, the low Grade energy is upgraded to high grade energy. The air source heat pump uses outdoor air as the heat source to heat or supply hot water. It is easy to install and use, has less environmental pollution, and its energy-saving effect is significantly higher than that of heating methods such as electric heating. However, there are some deficiencies in the operation of air source heat pumps in low temperature environments. For example, as the ambient temperature decreases, the indoor heat load demand ...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a CO 2 Heating heat pump system to solve the existing heating heat pump system using CO 2 Working fluid problems exist when making transcritical CO 2 The heat pump system can be efficiently and stably applied to heating in the form of radiators in winter

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