A new high-efficient cooling/power cogeneration system based on a double-flash geothermal power plant and a novel zeotropic bi-evaporator ejector refrigeration cycle. (December 2020)

• Record Type: Journal Article
• Authors: Feili, Milad; Rostamzadeh, Hadi; Ghaebi, Hadi
• Is Part Of: Renewable energy. Volume 162(2021)
• Page Start: 2126
• Page End: 2152
• Publication Date: 2020-12
• Subjects: Bi-evaporator -- Double-flash geothermal power plant -- Ejector refrigeration cycle (ERC) -- Zeotropic mixture -- Exergy; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2020.10.011
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: An innovative Bi-Evaporator Ejector Refrigeration Cycle (BE-ERC) working with different zeotropic mixtures is devised in this study. Next, the proposed BE-ERC system is used as binary cycle of a modified Double-Flash Geothermal Power Plant (DF-GPP) to simultaneously produce cooling and power from the same geothermal well. A comprehensive modeling of the proposed integrated system is carried out from thermodynamics laws viewpoints and the results are elaborated in detail. Based upon the results, the use of R142b/Pentane (0.6/0.4) is highly commendable due to achieving the maximum refrigeration load, Coefficient of Performance (COP), and total energy efficiency of 137.83 kW, 0.329, and 20.37%, respectively. Although net electricity and exergy efficiency were not maximum at this condition, their value was competitive. Accordingly, with the use of R142b/Pentane (0.6/0.4), the net electricity, exergy efficiency of the BE-ERC, and total exergy efficiency were calculated 18.61 kW, 2.16%, and 20.95%, respectively. Among all elements of the integral set-up, the first ejector (the main ejector in the BE-ERC) had the highest exergy destruction of 26.09 kW out of overall fuel exergy of 190.7 kW (13.68%), followed by the vapor generator with exergy destruction of 24.4 kW. Highlights: To devise a new BE-ERC and demonstrate its superiority to the existing ones. To use zeotropic mixture in the devised BE-ERC. To use the devised BE-ERC in integration with a modified DFB-GPP for cogeneration.