Absorption, compression and ejection composite cascade supercooling transcritical CO2 combined cooling and heating system

Abstract

The invention provides an absorption, compression and ejection composite cascade supercooling transcritical CO2 combined cooling and heating system. The system is composed of a transcritical CO2 refrigeration cycle, an absorption, compression and ejection composite cascade supercooling cycle and a hot-end heat-supply cycle, the absorption, compression and ejection composite cascade supercooling cycle is subjected to cascade throttling depressurization, therefore, supercooling of two different evaporation pressures is realized, the CO2 fluid at the outlet of a CO2 gas cooler is subjected to twocontinuous cascade supercooling, so that better temperature matching is formed during the heat exchange process, and the heat transfer temperature difference is reduced, the heat exchange irreversible loss in a CO2 subcooling process is significantly reduced, the temperature of the CO2 fluid at the outlet of the gas cooler is reduced, the throttling loss of CO2 is reduced, the compression ratio of a compressor is reduced, the isentropic efficiency is improved, and then the COP of the system is improved. The combined cooling and heating system can be widely applied to various occasions needingrefrigeration or heating, such as refrigeration, medium-high temperature hot water making and heating.

Description

technical field [0001] The invention relates to the technical fields of refrigeration and heating, absorption refrigeration, and heat pumps, in particular to an absorption compression ejection compound cascade supercooled transcritical CO 2 Combined cooling and heating system. Background technique [0002] Today, when energy is increasingly scarce and environmental problems are becoming more prominent, the whole society is looking for feasible ways to save energy and protect the environment. At the same time, new technologies and products with excellent performance, low price and stable operation are also emerging. In terms of energy consumption, heating, cooling and air-conditioning buildings account for a large proportion, and are the largest consumers of electricity in buildings. New energy-saving cooling and heat pump technologies need to be explored. For residential and commercial applications, the demand for cooling and heating is increasing day by day. At present, ...

AI Technical Summary

Problems solved by technology

However, due to CO 2 The critical temperature is low (31.1°C) and the critical pressure is high (7.38MPa), which results in large throttling irreversible loss and low refrigeration efficiency. 2 CO at the outlet of the refrigeration cycle gas cooler 2 Cooling can reduce throttling loss, increase circulating cooling capacity, and reduce CO 2 Cyclic operating high pressure and compressor exhaust pressure prolong the service life of the compressor and improve the cycle COP

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