Fig.1. Showshows the variation of consumption power over the day, for systemsystems located in three different cities; these are Valencia, Stockholm, and Berlin, and operates with two alternative refrigerants to R134a, which namedare R513A, and R450A. As the sun rises, the consumption power will decrease gradually decrease, with solar time increasing; reaches to lowest value; at this instantaneous, the solar intensity reaches to maximum value Fig.2. After this moment, the consumption power increases gradually with solar time increasing; reaches, reaching a maximum at sunset. The SDEC system uses waste heat from PV/T as a heat source for the generator. As a result of solar intensity increasing, the generator’s heat source will increase. Fig.2; this will reduce the required pump’s discharge pressure, Fig.3, so asalong with the pump’s consumption power and total power. The system located in Valencia has the lowest consumption power; meanwhile. Meanwhile, Valencia has a high solar intensity flowed by compared to Stockholm and Berlin.
On the other sideConversely, in Fig.1, the system that works with R450A, has the lowest consumption power fromcompared to other investigated refrigerants due to hashaving the lowest compressor work flowed byworkflow at the lowest saturation pressure, which leads to lowering the pump’s work. The current system utilizes condenser waste heat by using two heat recovery exchangers that will provide anthe ability to operate the system with moderate pump consumption power at zero solar intensity.