Thermodynamic analysis and optimization of a novel dual-evaporator system powered by electrical and solar energy sources, By Ali Saberimehr

Research

Title	Thermodynamic analysis and optimization of a novel dual-evaporator system powered by electrical and solar energy sources
Type	Article
Keywords	Dual-evaporator Ejector-expansion transcritical CO2 GAX Solar energy Exergy R1234yf
Researchers	Mortaza Yari، Ali Saberimehr، Seyed Mohammad Seyed Mahmoudi

Abstract

A novel dual-evaporator system with dual-source (renewable and electrical energies) is proposed to provide negative and positive evaporator temperatures. The system is a combination of the generator eabsorber heat exchange (GAX), ejector-expansion transcritical CO2 refrigeration (EETC), Organic Rankin Cycle (ORC) and supercritical CO2 power cycles. The system is analyzed and optimized thermodynamically in detail. It is found that allocating the lower temperatures (25 to 45 C) for EETC evaporator and higher temperatures (5e10 C) for GAX evaporator is more suitable. Detailed exergy analyses reveal that 19.89% and 5.92% of total input exergy, are useful in EETC evaporator and GAX evaporator, respectively. The ejector is found to be the highest source of irreversibility in the system. Moreover, the system performs better than dual-evaporator systems recently reported in literature.