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Proceedings of the 27th National and 5th International ISHMT-ASTFE Heat and Mass Transfer Conference December 14-17, 2023, IIT Patna, Patna-801106, Bihar, India
December, 14-17, 2023, Bihar, India

Comparative energy-exergy analysis of ejector integration in ORC by optimization method for ultra-low to medium temperature heat sources

Get access (open in a dialog) DOI: 10.1615/IHMTC-2023.2010
pages 1231-1236


Developing countries like India require more amount of electricity because of energy shortage (about 4.3% in June 2023) and to fulfil these requirement upgrades is necessity in the power generation cycles. In this context, the power generation from basic ORC can be increased by ejector employment at suitable location as ejector further drops the pressure in turbine resulting surplus work production from turbine. In this study 5 possible location of ejector employment is identified and comparative study has been done to analyse the modified cycle performance. These 5 modified cycles namely CYC1, CYC2…CYC5 have been optimized for boiler and ejector pressure to achieve maximum net work output at ultra low (70°C) and medium (140°C) heat source temperature (HST). Result shows that CYC2 has net work improvement of 16.02% at 70°C and 11.72% at 140°C HST. CYC2 possess maximum net work output but at minimum thermal efficiency among all modified and basic cycles at ultra low to medium HST. When compared to CYC0, CYC2 has the lowest thermal efficiency, with reductions of 58.83% at 70°C and 37.36% at 140°C. CYC0 achieves maximum thermal efficiency. Total irreversibility is likewise at its highest for CYC2, increasing by 69.67% at 70°C and by 11.60% at 140°C, demonstrating that irreversibility is not favourable for ultra low HST. So CYC2 modification is only favourable for achieving maximum net work output for the generation of electricity at ultra low to medium temperature heat source. CYC0 also can be directly used to serve purpose where thermal efficiency is concern.