Low pressure level gas supplementing quasi-tertiary vapor compression type refrigerating system

Abstract

The invention discloses a low pressure level gas supplementing quasi-tertiary vapor compression type refrigerating system, aiming at providing a refrigerating system which can enhance the refrigerating capacity and input power of the refrigerating system so as to improve COP of the system. The outlet of a vaporizer is connected with the low pressure vapor inlet of a low pressure level compressor, the outlet of the low pressure level compressor is in paralleled connection with the intermediate temperature refrigerant outlet of an intermediate cooler followed by being connected with the inlet of a high pressure level compressor, the outlet of the high pressure level compressor is connected with the inlet of a condenser, one path of the outlet of the condenser is connected with the inlet of an intermediate cooler coil, the outlet of the intermediate cooler coil is connected with the supercooling liquid inlet of a flash evaporator, the gas outlet of the flash evaporator is connected with the make-up gas opening of a low pressure level compressor through a first electronic expansion valve, the liquid outlet of the flash evaporator is connected with the inlet of the vaporizer through the second electronic expansion valve, and the other path of the outlet of the condenser is connected with the box body port of the intermediate cooler through a throttle. The invention can meet the requirement of low temperature and realize the aim of energy saving.

Description

technical field [0001] The invention relates to a refrigerating system, more specifically, to a low-pressure air-supplementing quasi-three-stage vapor compression refrigerating system. Background technique [0002] The refrigeration system generally operates during the hottest period of the year, and the higher the ambient temperature, the lower the system pressure difference and energy efficiency ratio. Therefore, the operating parameters of the system change with the ambient temperature, and the required cooling capacity also changes. [0003] At present, the general refrigeration system is an ordinary two-stage vapor compression refrigeration system. When operating in summer, due to the high outdoor temperature, the pressure difference of the system is large, which reduces the cooling capacity and consumes too much compressor power. The demand cannot be met when the temperature requirement is low and the cooling capacity requirement is large. Contents of the invention ...

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Problems solved by technology

[0003] At present, the general refrigeration system is an ordinary two-stage vapor compression refrigeration system. When operating in summer, due to the high outdoor temperature, the pressure difference of the system is large, which reduces the cooling capacity and consumes too much compressor power. The demand cannot be met when the temperature requirement is low and the cooling capacity requirement is large

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