Injection supercharging cascade supercooling injection throttling transcritical CO2 system and application

Abstract

The invention provides an injection supercharging cascade supercooling injection throttling transcritical CO2 system and application. The system comprises a CO2 low-temperature-level evaporator and acommon working medium-temperature-level compressor, wherein an outlet of the CO2 low-temperature-level evaporator sequentially communicates with an inlet of a secondary flow of a CO2 injector, a heating medium side of the CO2 medium-temperature-level evaporator, the CO2 compressor, a heating medium side of a CO2 gas cooler, a heating medium side of a medium-temperature-level cooling evaporator andan inlet of a heating medium side of a low-temperature-level cooling evaporator; an outlet of the heating medium side of the low-temperature-level cooling evaporator is divided into two paths to communicate with a main flow inlet of the CO2 injector and an inlet of the CO2 low-temperature-level evaporator; and an outlet of the common working medium-temperature-level compressor sequentially communicates with a heating medium side of a condenser and a main flow inlet of a common working medium injector. According to the injection supercharging cascade supercooling injection throttling transcritical CO2 system, power consumption can be reduced, irreversible throttling losses can be reduced, and the system energy efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, heating and heat pumps, and in particular relates to a supercooled injection throttling transcritical CO 2 systems and applications. Background technique [0002] Energy and environmental issues have become important factors restricting my country's economic and social development. The high energy consumption and environmental pollution in the field of refrigeration and air-conditioning have aroused widespread concern, and at the same time, they have also become restrictive factors that limit the development of refrigeration and air-conditioning. For residential and commercial applications, there is an increasing demand for multi-zone cooling and heating. Most of the current solutions use two or more devices to meet the requirements of different temperature zones, which not only causes a great waste of energy, but also causes damage to the environment. Moreover, most of the refrigerants ...

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Problems solved by technology

[0007] However, the single-stage subcooling of the conventional non-azeotropic refrigerant refrigeration cycle cannot satisfy both the heat transfer fluid side and the CO 2 Temperature matching on the fluid side, which in turn causes large irreversible losses

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