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In this comparative study, the thermodynamic analysis of a trigeneration  system driven by a parabolic trough solar collector based on two different  types of nanofluid is performed. A standard trigeneration system consists of  two subsystems, including an absorption heat pump and the organic Rankine  cycle. Two types of nanoparticles (graphene and ferrofluid) that possess  excellent and diverse physical properties within a base fluid (Syltherm 800)  were selected to be the absorption fluids in the solar cycle. Four organic  fluids, namely R123, R401a, R601, and R601a, for the organic Rankine cycle  are examined. The results clearly depicted improvement in the system  performance. It was found that graphene nanoparticles performed better as  compared to the ferrofluid nanoparticles. The largest temperature of the  collector outlet was obtained at 257.4℃ with Syltherm 800/graphene. The  highest net power produced by the system was 134.1 kW and the maximum  overall energy and exergy efficiencies of the system were 160.5% and 21.84%,  respectively. The highest net power produced by the system was 134.1 kW and  the maximum overall energy and exergy efficiencies of the system were 160.5%  and 21.84%, respectively. The solar collectors are the main source of the  exergy destruction and the highest value was recorded about 683kW.

Comparative analysis of a solar trigeneration system based on parabolic trough collectors using graphene and ferrofluid nanoparticles