Exergetic cost evaluation of hydrogen production powered by combined flash-binary geothermal power plant. (26th October 2015)

• Record Type: Journal Article
• Authors: Yilmaz, Ceyhun; Kanoglu, Mehmet; Abusoglu, Aysegul
• Is Part Of: International journal of hydrogen energy. Volume 40:Number 40(2015)
• Page Start: 14021
• Page End: 14030
• Publication Date: 2015-10-26
• Subjects: Geothermal energy -- Flash-binary cycle -- Electrolysis -- Hydrogen production -- Exergy -- Exergoeconomics; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.07.031
• Languages: English
• ISSNs: 0360-3199

Abstract

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 ). Highlights: A combined flash-binary geothermal plant and a water electrolyzer for hydrogen production are considered. Exergetic cost analysis of the system is performed. The unit exergetic cost of electricity from the power plant is 11.1 $/GJ (or 0.0400 $/kWh). The unit exergetic cost of hydrogen is 26.1 $/GJ (or 3.14 $/kg H2 ).