Abstract
Thermodynamic analysis and exergy based cost formation of hydrogen production by a water electrolysis process powered by a binary geothermal power plant is performed. The exergetic cost formation process is developed applying the specific exergy cost method (SPECO). For a geothermal resource temperature of 160°C and a geothermal flow rate of 100kg/s, hydrogen gas can be produced at a rate of 0.0253kg/s in the electrolyzer. This corresponds to 0.253g of hydrogen production per kilogram of geothermal water. Thermoeconomic cost analysis reveals that the unit exergetic costs of electricity and hydrogen produced in the system are 6.495$/GJ (or 0.0234$/kWh) and 19.7$/GJ (or 2.366$/kg H2), respectively.
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