Thermoeconomic cost evaluation of hydrogen production driven by binary geothermal power plant

Yilmaz C., Kanoglu M., Abusoglu A.

GEOTHERMICS, vol.57, pp.18-25, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 57
  • Publication Date: 2015
  • Doi Number: 10.1016/j.geothermics.2015.05.005
  • Journal Name: GEOTHERMICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.18-25
  • Keywords: Geothermal energy, Binary cycle, Hydrogen production, Electrolysis, Exergoeconomics, SPECO, ENERGY, HEAT
  • Istanbul Technical University Affiliated: No


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 degrees C and a geothermal flow rate of 100 kg/s, hydrogen gas can be produced at a rate of 0.0253 kg/s in the electrolyzer. This corresponds to 0.253 g 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 H-2), respectively. (C) 2015 Elsevier Ltd. All rights reserved.