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        Energy and exergy evaluation of a tri-generation system driven by the geothermal energy

        Ehsan Akrami,Ata Chitsaz,Pooria Ghamari,S. M. S. Mahmoudi 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.1

        In this paper, a geothermal-based tri-generation energy system with three useful outputs is clearly developed to produce electricity, heating and hydrogen. To have a better view of the thermodynamic performance of the present integrated system, parametric studies upon the effects of geofluid mass flow rate, turbine inlet temperature and pressure on the energy and exergy efficiencies of the system are undertaken. Under the specified circumstances, the related efficiencies of energy and exergy for the overall system are estimated around 26.14 % and 44.45 %, respectively, while these efficiencies for this system with electricity and heating generation, amount to 25.32 % and 39.75 %, and these amounts for solely electricity generation are 6 % and 33.47 %, respectively. Also the amount of net electricity power and heating generation in specific design parameter values are estimated around 43.47 (kW) and 149.8 (kW), respectively. In addition, for every 10.4 kW of electrical energy consumption in the electrolysis unit, pure hydrogen will be produced at a rate of 0.2 kg/hour.

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