Trans-critical cycle double-stage heat absorption providing composite refrigeration system

Abstract

The invention discloses a trans-critical cycle double-stage heat absorption providing composite refrigeration system. The refrigeration system is composed of a trans-critical compression subsystem, a high-pressure absorption subsystem and a low-pressure absorption subsystem and is a novel closed compression absorption composite system. The generation heat of both the high-pressure absorption subsystem and the low-pressure absorption subsystem is from the trans-critical compression subsystem through reasonable energy coupling, the grade of the usable waste heat of the low-pressure stage of the double-stage absorption is reduced, and the utilization rate of the waste heat of exhaust air at an air outlet of a trans-critical compressor is improved, so that the absorption subsystem does not need additional heat input, only needs necessary electric energy input from the compressor and has good independence and application scope. Compared with simple trans-critical cycle compression, the composite cycle system has the COP increased by about 30% to 40%, thereby having good economical efficiency.

Description

technical field [0001] The invention belongs to the field of refrigeration, and relates to a compression / two-stage absorption composite refrigeration system, in particular to a composite refrigeration system in which a transcritical cycle provides heat generated by a two-stage absorption cycle. Background technique [0002] As the concept of energy saving and environmental protection is deeply rooted in the hearts of the people, the transcritical refrigeration cycle can utilize Freon working fluids with high potential value of greenhouse effect but environmental protection such as R23, R508B or natural working fluids such as CO 2 , N 2 The merits of O have received a lot of attention. The transcritical refrigeration cycle has the characteristics of high exhaust temperature and large temperature glide. It has high temperature and a large amount of condensation heat can be recycled. As early as 2001, Corona and Dens jointly developed the first CO 2 The heat pump water heater...

AI Technical Summary

Problems solved by technology

However, due to the cycle characteristics of the system, the high-pressure generator can only use the condensation waste heat above 65°C, but theoretically it can be used below 40°C, and the waste heat utilization is not sufficient

In addition, although low-pressure generators can use the extremely low-grade heat sources that are generally wasted at 50°C to 60°C, they still require a large amount of external energy input and are not suitable for ordinary building environments that cannot provide a large amount of waste heat.

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