Integrated On-Grid PV – Cascade R717/R744 Refrigeration Systems for 100 T Cold Storage Facility at Pelabuhan Perikanan Nusantara Prigi

The rising of cold storage industry has revolutionized food preservation technique ever since its discovery, by reducing the temperature of the food below the freezing point as low as -40^o C will lengthen the freshness and keep its protein content even further, but we also notice the disadvantage of a cold storage facility, it consumed a massive amount of electricity as well as contributing in global CO2 emission and raising the global warming potential, the cold storage that we are researching on are using single stage vapor compression system with R404A for its refrigeration system. In this paper, authors propose an upgrade design of refrigeration and power supply systems for cold storage facility at Pelabuhan Perikanan Nusantara Prigi. The design is using a cascade R717/R744 refrigeration system integrated with rooftop on-grid solar PV to reduce electric power consumption and its CO2 emission. The Pack Calculation Pro and PVsyst softwares are used for designing and simulating the proposed design. The current cold storage total power consumption are 187,4 MWh/year, while our simulation result for the proposed cascade refrigeration system using Pack Calculation Pro software shows an annual power consumption of 92,38 MWh/year, and for the rooftop on-grid solar PV system with projected area of about 21 x 22 meter would generate 108,84 MWh/year with a 62,7 kWp system, with a performance ratio of 77.9% that would have a guaranteed to have a life time operation of over 25 years and reducing a total emission of 1.912,1 ton CO2 (in 30 years calculation). Thus, meaning this proposed cold storage upgrade will have zero annual electricity cost and can be considered as a net zero cold storage facility.