Abstract
Transcritical CO2 refrigeration system is coupled with the single effect vapour absorption with LiBr-water as a working pair having an objective to enhance the performance of low temperature transcritical refrigeration system while using natural working pair and to reduce the electricity consumption to produce low temperature refrigeration. The high grade waste heat rejected in the gas cooler of tc-CO2 compression refrigeration system (TCRS) is utilized to run the single effect vapour absorption system (SEVAR) to enhance the energy efficiency of the system. The gas cooler in the transcritical CO2 system is having heat energy at high temperature and pressure, which is utilized to run the vapour absorption system, while the other refrigerant heat exchanger provides subcooling to further enhance the performance. The combined cycle can provide refrigeration temperature at different levels, to use it for different applications. Energetic and exergetic analysis have been done to analyze the combined system to compute the performance parameters and the irreversibilities occurring in different components to further increase the performance. The combined system is optimized for various heat rejection and refrigeration temperatures. The COP of the combined system has been enhanced by to 24.88% while the enhancement in exergetic efficiency (ηex) is observed as 10.14% respectively over tradition transcritical CO2 compression refrigeration system, with -10°C as an evaporation (TCRS cooling) temperature and exit temperature of gas cooler T4 being 40°C. Doi: 10.28991/HIJ-2021-02-02-02 Full Text: PDF
Highlights
Refrigeration and air conditioning plays vital role in almost every sector of the society
The present study focus on the use of waste heat to run the single effect vapour absorption system (SEVAR)
The COP of the combined system increases by 24.88 % while the exergetic efficiency is increased by 10.14% over the modified tc-CO2 compression refrigeration system (TCRS) having RHXTC
Summary
Refrigeration and air conditioning plays vital role in almost every sector of the society. In 1987, Montreal Protocol [1], gave the time limit for the usage of chlorofluorocarbon (CFC) and hydrochlorofluorocarbon (HCFC) refrigerants, as they are responsible for ozone depletion, but still the use of hydroflourocarbons (HFC)s was being the major concern as its effects are hazardeous for the environment and climate change. CO2 as a naturally occurring refrigerant having good thermophysical properties [4] finds favour across almost all sectors of refrigeration to be used as the refrigerant [5]. It is having critical temperature of 30.85°C [3].
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