Single-and-double-stage switching evaporative supercooling refrigeration heat pump circulation system

Abstract

The invention discloses a single-and-double-stage switching evaporative supercooling refrigeration heat pump circulation system which includes a first compressor, a second compressor, a condensing heat exchanger, a first throttle valve, an evaporative subcooler, a second throttle valve, an evaporation heat exchanger and a four-way valve. The four-way valve is used to realize switching of the parallel single-stage compression and series two-stage compression of the first compressor and the second compressor according to the operating conditions; by adopting a novel evaporation supercooling method, the amount of gasification and throttling loss of a working medium after throttling can be reduced, and a system COP is improved while the refrigeration capacity and heating capacity of the systemare increased; and the problems that the obtained supercooling degree is limited, the supercooling degree is limited by the intermediate completion pressure and the type of compression is limited when the supercooling technologies such as heat regenerators and gas supplement and enthalpy increasement are carried out are solved.

Description

technical field [0001] The invention relates to the technical field of building air conditioning and heating energy utilization, in particular to a single-stage and double-stage switching evaporative supercooling refrigeration heat pump cycle system. Background technique [0002] For the vapor compression cycle, increasing the subcooling degree after the condenser can increase the cooling capacity of the unit refrigerant flowing through the evaporator, and can also increase the system COP. The existing subcooling forms mainly adopt two forms of regenerator and economizer. Although both the regenerator and the economizer can obtain subcooling, there are obvious differences between the two. For the regenerator, increasing the subcooling degree of the refrigerant before the throttle valve also increases the superheating degree of the compressor suction port, and the subcooling is beneficial to the system COP but the overheating is harmful to it. For the quasi-two-stage compre...

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Problems solved by technology

This cycle mode can obtain a large degree of supercooling, but the degree of supercooling to the system COP is limited, and this cycle mode cannot be adjusted to maximize the system COP by adjusting the optimal degree of supercooling, nor can it be adjusted by adjusting the degree of supercooling To increase the heating / cooling capacity of the refrigeration system

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