COMPARATIVE STUDY OF VARIOUS SUPERMARKET REFRIGERATING SYSTEMS IN EUROPEAN CLIMATE CONTEXT

摘要

Due to the enormous carbon footprint of food retail stores the interest in natural working fluids, such aspropane (R290) and CO_2 (R744), has recently intensified in the commercial refrigeration sector.In this theoretical investigationthe performance of various technologies employing low-global warmingpotential (GWP) refrigerants was compared in an average-size supermarket located in different Europeancities. It was found that a R744 multi-ejector enhanced parallel compression systemconsumed from 24.6% inAthens (Greece) to 37.1% in Oslo (Norway) less electricity compared to a R404A direct expansionrefrigerating solution (baseline). Also, the results obtained suggested that CO_2/R1234ze€ indirectarrangements perform slightly better than CO_2/R290 indirect units. In particular, the former offered, at best,energy savings by 6.9% (in Athens) over the selected baseline. Finally, it was revealed that thesolutionoutfitted with the multi-ejector block featuresbetween 36.8% and50.3% in heating mode and between 3.1%and18% in air conditioning (AC) mode lower total power input than separated hydrofluorocarbon (HFC)units over the selected range of outdoor temperatures. It could be concluded that highly efficient as well asclimate friendly technologies are readily available for the European food retail industry.