Ceyhun Yilmaz

Thermal Design of Alkaline Water Electrolysis Assisted by Combined Flash Binary Geothermal Power Plant

The purpose of this study is thermoeconomic performance evaluation of alkaline water hydrogen production assisted by geothermal energy. In this study energy, exergy and cost balances of combined systems of each component for hydrogen production assisted by geothermal energy will be written. Exergy of each involved stream will be calculated and the exergetic balance of each subsystem will be assessed, as well as the global system, identifying and quantifying losses. This will allow thermodynamic performances of combined systems and each component. This information will be relevant to optimize the system performance from an economical point of view.We consider a geothermal resource at 230°C available at a rate of 230 kg/s. Under realistic operating conditions, 21545 kW power can be produced in a power plant. The produced power is used for the electrolysis process. The electrolysis water can be preheated to 67.6°C by the geothermal water leaving the power plant and hydrogen can be produced at a rate of 0.1125 kg/s. Also, combine flash binary geothermal power plant energy and exergy efficiencies are calculated to be 12.1% and 57.4% at this condition. Electrolysis system energy and exergy efficiencies are calculated to be 71.4% and 60.7% of geothermal water temperature at 230°C and geothermal water flow rate at 230 kg/s. We evaluated at unit exergetic cost of electricity combined flash binary system is 10.1

Thermoeconomic Optimization of Hydrogen Production and Liquefaction by Geothermal Power

/GJ (0.0364

Thermodynamic analysis of models used in hydrogen production by geothermal energy

/kWh) and unit exergetic cost of hydrogen is 34.6

Thermodynamic evaluation of geothermal energy powered hydrogen production by PEM water electrolysis

/GJ (4.16

Economics of hydrogen production and liquefaction by geothermal energy

/kg H2).Copyright

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

In this study, the thermoeconomic approximation is applied to the optimization of a case study of a geothermal hydrogen production and liquefaction system. The objective of this application is to minimize its overall product unit costs (electricity, hydrogen production, and hydrogen liquefaction). The approximation is based on the cost-optimal exergetic efficiency that is obtained for a component isolated from the remaining of the system components. The objective function that expresses the optimization methodology for each subcomponent of the system is developed. In the iterative optimization methodology, the variables, relative cost differences, and exergy efficiency with the corresponding optimal values are obtained. Exergoeconomically optimal values for total product cost flow rate, total cost fuel flow rate, cost of electricity, cost of hydrogen production, and cost of hydrogen liquefaction are calculated to be 1820

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

/h, 274.2

Geothermal energy use in absorption precooling for Claude hydrogen liquefaction cycle

/h, 0.01908

Thermoeconomic modeling and optimization of a hydrogen production system using geothermal energy

/kWh, 1.967

Thermoeconomic analysis of a CO 2 compression system using waste heat into the regenerative organic Rankine cycle

/kg, and 1.095