Abstract
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 °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 °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 H2).
Original language | English |
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Pages (from-to) | 14021-14030 |
Number of pages | 10 |
Journal | International Journal of Hydrogen Energy |
Volume | 40 |
Issue number | 40 |
DOIs | |
Publication status | Published - 26 Oct 2015 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2015 Hydrogen Energy Publications, LLC.
Funding
This study is sponsored by the Scientific and Technological Research Council of Turkey (TUBITAK) with project number 113M207 . This support is greatly appreciated.
Funders | Funder number |
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Scientific and Technological Research Council of Turkey | |
TUBITAK | 113M207 |
Keywords
- Electrolysis
- Exergoeconomics
- Exergy
- Flash-binary cycle
- Geothermal energy
- Hydrogen production