Sammendrag
In the seafood processing sector in India, natural refrigerant such as NH3 is currently replaced by Freon
refrigerants such as HFC-404A, because these systems are comparably more compact, operate above
atmospheric pressure and are less toxic. However, these synthetic refrigerants are one of the major sources
of global warming. This paper focuses on a standalone-CO2 system with a multi-ejector for transcritical
operation and an NH3-CO2 cascade system considering the climatic conditions of important coastlines
covering the majority of catch in India. The annual coefficient of performance is compared, and the results
show that the COP of NH3-CO2 cascade system exceeds the HFC-404A system by 35 %. Cascade system
performs better for -40 oC deep freezers, and the standalone-CO2 system with heat recovery can be efficiently
used for -18 oC cold storage. This study will aid in the retention of natural refrigerants in many seafood cities
of India.
Keywords: ammonia, carbon dioxide, natural refrigerant, cascade, seafood processing
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