Abstract
A geothermal-powered tri-generation system is presented and discussed from thermodynamic, exergoeconomic, payback period, extended-environmental, and exergoenvironmental perspectives. The designed system consists of an organic flash cycle assisted by a two-phase ejector and a vapor compression cycle that utilizes a zeotropic working fluid of Isobutane/Pentane. To further recover waste heat, an electrolyzer unit is utilized as a subsystem for producing H2. All the system outputs except for the exergoenvironmental index and exergoeconomic factor reach the highest point when the mass fraction of Pentane increases. According to a parametric study, the greatest variations in system products are related to changes in the flash tank temperature. Furthermore, the system outputs indicate a non-linear relationship with the mass fraction of Pentane. The temperature of evaporators has a substantial influence on the system's cooling capacity. Meanwhile, the remaining output parameters remain steady or show minor changes. By increasing the flash tank temperature, the costs related to electricity, cooling, and H2 all decreased before gradually increasing. The two-phase ejector has the highest exergy destruction rate because of the energy lost in the mixing process.
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