Author : Didier ZEH NDOH, Francklin G. NYAMI, Brice SANDONG OMGBA and Frederic LONTSI

This work deals with the development and exergy analysis of a hybrid multi-temperature combined vapor compression and ejection refrigeration system that can be powered by a dual energy source such as solar PVT, in the context of off-grid energy access. A simulation model has been developed considering the environment friendly refrigerants R134a, R152a and R290. The simulation results carried out under the defined operating conditions showed the proportions of exergy destruction in every component of the system. Based on the obtained result, an improved system has been proposed and analysed. The simulation results obtained with the latter have shown an increase of exergy efficiency of about 7.7; 6.8 and 6.6 when the system operates based on refrigerant R152a, R290 and R134a respectively.

Keywords: Exergy analysis, combined-cycle refrigeration system, multi-temperature, solar PVT, off-grid energy access