Geothermal-Assisted Hydrogen Production and Energy Storage for Peak-Time Grid Support: A Thermo-Economic Assessment in Ardebil, Iran
نویسندگان
1 Department of Mechanical Engineering, University of Tabriz, Tabriz, I.R. IRAN
2 Department of Mechanical Engineering, University of Tabriz, Tabriz, I.R. IRAN
3 Department of Mechanical Engineering, University of Tabriz, Tabriz, I.R. IRAN
4 Department of Mechanical Engineering, University of Tabriz, Tabriz, I.R. IRAN
doi
10.30492/ijcce.2025.2068269.7246چکیده
This study evaluates a geothermal-assisted pathway that stores off-peak electricity as hydrogen and supplies power at peak demand for the city of Ardebil. The system couples a Superhot Rock source with a dual Organic Rankine Cycle, a PEM electrolyzer, hydrogen storage, and a PEM fuel cell. We model the system in Aspen HYSYS and MATLAB and report energy, exergy, and cost metrics. The base case achieves an exergy efficiency of 45%, a hydrogen-specific energy consumption of 38.6 kWh/kg, and a daily hydrogen output of approximately 500 kg. The levelized cost of hydrogen is $ 3.42 per kilogram, and the simple payback period is 6.6 years. The novelty is the use of high-enthalpy geothermal heat to time shift energy through hydrogen for an urban grid, together with a coupled thermo-economic model that we validate and quantify with uncertainty.
