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

Mortaza Yari, A.S. Mehr and S.M.S. Mahmoudi

Energy, 2013, vol. 61, issue C, 646-656

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–absorber 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 (5–10 °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.

Keywords: Dual-evaporator; Ejector-expansion transcritical CO2; GAX; Solar energy; Exergy; R1234yf (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (12)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:61:y:2013:i:c:p:646-656

DOI: 10.1016/j.energy.2013.09.025

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