A microchannel near-isothermal compression transcritical carbon dioxide circulation system and method

Abstract

The invention provides a micro-channel near-isothermal compression type transcritical carbon dioxide circulation system and method. The system includes: the low-pressure outlet of the regenerator is connected to the central inlet of the centrifugal impeller through an isothermal compression suction pipe, and the circumferential outlet of the centrifugal impeller is connected to several The inlet of a scaling microchannel heat exchanger is connected, the outlet of the scaling microchannel heat exchanger is connected to the inlet of the gas collector, the outlet of the gas collector is connected to the inlet of the auxiliary gas cooler through an isothermal compression exhaust pipe, and the outlet of the auxiliary gas cooler is connected to the heat recovery The high-pressure outlet of the regenerator is connected to the inlet of the evaporator through the electronic expansion valve, and the outlet of the evaporator is connected to the inlet of the gas-liquid separator; the gas outlet of the gas-liquid separator is connected to the low-pressure inlet of the regenerator. The present invention replaces the realization method of the conventional nearly isentropic compression process with the near isothermal compression process, thereby without affecting the transcritical CO 2 The power consumption of the compressor is significantly reduced on the premise of maintaining the cooling capacity of the system, thereby greatly improving the energy efficiency ratio of the cycle.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and heat pumps, and relates to a microchannel near-isothermal compression transcritical carbon dioxide circulation system and method. Background technique [0002] After the protection of the global ozone layer has achieved initial results, the control and reduction of strong greenhouse gases have become the main content of the technological transformation of the refrigeration industry. In this context, as a pure natural working medium, CO 2 back into the public eye. Compared with other alternatives such as CFC and HCFC refrigerants that are extremely destructive to the ozone layer, and HFC refrigerants with a high greenhouse effect index, CO 2 The working fluid is the only refrigerant alternative that is non-toxic, non-flammable, ODP (Ozone Destruction Index) is 0, GWP (Greenhouse Effect Index) is extremely low, and low temperature fluidity / heat transfer is excellent. At the same time, wh...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of microchannel nearly isothermal compression type transcritical carbon dioxide circulation system and method, in conventional transcritical CO 2 In the cycle, the implementation method of the conventional near isentropic compression process is replaced by the near isothermal compression process, so as not to affect the transcritical CO 2 Under the premise of the cooling capacity of the system, the power consumption of the compressor is significantly reduced to greatly improve the energy efficiency ratio of the cycle, and finally solve the practical problem that the current conventional transcritical CO2 refrigeration and heating technology application methods have poor performance coefficients under many working conditions

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