Pressure wave supercharging auxiliary twin-stage vapor compression refrigeration system and working method thereof

Abstract

The invention discloses a pressure wave supercharging auxiliary twin-stage vapor compression refrigeration system and a working method thereof and belongs to the technical field of mechanical refrigeration. The system utilizes the supercharging characteristic of a flashing shock wave to complete precompression of refrigerant vapor and realize the purpose of reducing the pressure ratio of a refrigeration compressor; two-phase separation of a liquid phase refrigerant is completed by utilizing the expanding characteristic of an expansion wave to realize twin-stage refrigerating cycle of isentropic expansion and isenthalpic throttling. A refrigerant enters a four-port wave rotor supercharger via an evaporator to be supercharged and mixed with airflow of the gaseous phase opening of a separator, enters the refrigeration compressor to be supercharged, and is condensed to enter the four-port wave rotor supercharger in a saturation liquid manner for flashing; formed two-phase mixture passes through the separator, the liquid phase throttles to enter the evaporator for refrigeration, the gaseous phase is mixed with supercharged vapor, and the mixture enters the refrigeration compressor. The pressure wave supercharging auxiliary twin-stage vapor compression refrigeration system is simple, solves the problems that the compressor is large in pressure ratio and has no stage intercooling of multistage compression during the vapor compression refrigeration cycle, and has the advantage of being higher in energy efficiency ratio than the traditional twin-stage vapor compression refrigeration system.

Description

technical field [0001] The invention relates to a two-stage vapor compression refrigeration system assisted by air wave supercharging and a working method thereof, belonging to the technical field of mechanical refrigeration. Background technique [0002] Water (R718), as a natural refrigeration and refrigerant, has high latent heat, non-toxic, non-flammable and non-explosive and environmentally friendly characteristics (global warming index GWP=0, ozone depletion potential value ODP=0), especially R718 High theoretical energy efficiency ratio (COP) has attracted worldwide attention in recent years. Relevant studies have compared the differences between R718 and conventional refrigerants (R134a, R22, etc.) in terms of system COP, operating cost, cooling capacity, and impact on the environment. At 5K, the COP value of the compression system with water as the refrigerant is the highest. Another advantage of using R718 in the vapor compression refrigeration system is that the...

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Problems solved by technology

At present, although R718 can be used in multi-stage vapor compression refrigeration systems, due to the high initial investment required for inter-stage cooling equipment, and this R718 compressor has a much larger compression ratio than conventional refrigerants (2 times that of R134a) and large The volume, high speed, and large displacement equipment size seriously hinder the wide application of R718 refrigerant in vapor compression refrigeration systems

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