Double-stage compression intermediate gas supplementing CO2 three-stage heat regenerating cooling heat pump/refrigeration system

Abstract

The invention relates to the technical field of heat pump / refrigeration, and discloses a double-stage compression intermediate gas supplementing CO2 three-stage heat regenerating cooling heat pump / refrigeration system. The system is composed of an evaporator, a low-pressure compressor, an intermediate cooler, a high-pressure compressor, a gas cooler, a first heat regenerator, a first expansion valve, a second heat regenerator, a third heat regenerator, a second expansion valve, a flow dividing device, a three-way valve, a first gas-liquid separator, a second gas-liquid separator, a first oil separator and a second oil separator, and the system is divided into two parallel branches of a main loop and a gas supplementing loop through the flow dividing device. The system can be applied to a heat pump and refrigeration, the system can realize relatively high heating COP under an extremely low-temperature environment through double-stage compression intermediate gas supplementation, and thesystem can realize relatively high heating COP and refrigeration COP under the condition that the exhaust gas temperature of the gas cooler is high through heat regeneration of the heat regenerators.

Description

technical field [0001] The present invention relates to the field of heat pump / refrigeration technology, more specifically, to a CO 2 Heat pump / refrigeration system. Background technique [0002] In the history of refrigerant development, synthetic refrigerants have been widely used because of their good refrigeration performance. However, while utilizing these refrigerants, people have gradually discovered that artificially synthesized refrigerants that are far from nature will cause some degree of harm to the environment. [0003] The chlorine or bromine atoms of the second-generation refrigerants CFCs and HCFCS react with ozone in the stratosphere above the atmosphere, making the environmental problem of ozone layer destruction more and more obvious, and gradually attracting people's general attention. The third-generation refrigerants mainly include HFCs and other refrigerants that do not contain chlorine and bromine, and their ODP is zero. However, with the applicatio...

AI Technical Summary

Problems solved by technology

The third-generation refrigerants mainly include HFCs and other refrigerants that do not contain chlorine and bromine, and their ODP is zero. However, with the application of the third-generation refrigerants, it has been found that its greenhouse effect is serious

In addition, CO 2 The performance of heat pump / refrigeration system declines in low temperature environment and cannot be popularized well

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