Exergetic cost evaluation of hydrogen production powered by combined flash-binary geothermal power plant

Yilmaz C., Kanoglu M., Abusoglu A.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, vol.40, no.40, pp.14021-14030, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 40 Issue: 40
  • Publication Date: 2015
  • Doi Number: 10.1016/j.ijhydene.2015.07.031
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.14021-14030
  • Keywords: Geothermal energy, Flash-binary cycle, Electrolysis, Hydrogen production, Exergy, Exergoeconomics, WATER ELECTROLYSIS, ENERGY, OPTIMIZATION, SYSTEM
  • Istanbul Technical University Affiliated: No


A combined flash-binary geothermal plant and a water electrolysis unit for hydrogen production are considered and thermodynamic and exergoeconomic analyses of the system are performed. A liquid geothermal water resource at 200 degrees C with a flow rate of 100 kg/s is considered. The power produced in the plant is used for the electrolysis process. The electrolysis water can be preheated to 70 degrees C by the geothermal water leaving the power plant and hydrogen can be produced at a rate of 0.0498 kg/s. The exergy efficiency of the power plant and the overall system are calculated to be 46.6% and 45.8%, respectively. The unit exergetic cost of electricity from the power plant is 11.1 $/GJ (or 0.0400 $/kWh) and that of the produced hydrogen is 26.1 $/GJ (or 3.14 $/kg H-2). Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.