Comparative analysis of a few novel multi-evaporator CO2-NH3 cascade refrigeration system for seafood processing & storage

Three novel CO2-NH3 multi-evaporator cascade refrigeration systems (CRS) are proposed and evaluated for application in seafood processing high ambient. The CRSs have evaporators both above below the temperature intended to replace a multi evaporator NH3 system. They exploit comparatively superior thermo-physical properties of CO2 low while condenser keep overall operating pressure low. Thermodynamic models single validated against published literature. CRS1 has an individual compressor each CRS2 & CRS3 incorporate pumped circulation system circuits, respectively. improve efficiency, reduce ammonia charge contamination hazards from NH3. Suitability established wide range tropical ambient also cooling demands other prominent storage applications like fish fillets shrimp/prawn. is found give highest COP advantage about 11.5% surimi where foremost load at evaporator. While gainful fillet shrimp/prawn industry major 16.5% 20.3%, respectively observed processing. Dealing with climate condition Mumbai (India), CRS1, showed maximum 8.3% reduction Annual average energy consumption (AAEC), AAEC which 7.5% 13.2%,