Thermal performance of multi cascaded vapour compression NH3H2O absorption systems for ultra-low temperature applications

In this paper, we propose three multi cascaded vapor absorption–compression refrigeration systems using low GWP ecofriendly refrigerants such as hydrocarbons, ethylene and R32 in ultra-low evaporator temperature cycle of -130oC and R245fa and R32 in intermediate evaporator temperature cycle of -95oC and HFO refrigerants and natural refrigerants to produce cooling capacity at -50 °C. The comparison of four cascaded systems was also carried out at -50oC using HFC refrigerants with R717 refrigerant. It is found that multi cascaded vapour compression NH3H2O absorption systems using HFO-1234yf in medium temperature cycle and R245fa in intermediate temperature cycle and R32 in ultra-low temperature cycle significantly improve the thermodynamic first and second law performances as compared to simple NH3H2O vapour absorption refrigeration systems. It was also observed that by considering proper safety measure, the Hydrocarbon (R600a) worked well for ultra-low temperature applications for replacing R404a and R236fa 



This article is published in peer review journal and open access journal, International journal of research in engineering and innovation (IJREI)  which have a high impact factor journal for more details regarding this article, please go through our journal website.


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