Using various organic rankine cycles for production of power and hydrogen by incorporating geothermal energy and proton exchange membrane (A comparative study)

In the current work different organic rankine cycles (base and modified) coupled with proton exchange membrane presented to produce hydrogen and power. Organic rankine cycles used in this work are basic Organic Rankine Cycles (ORC), ORC incorporating regenerator, ORC incorporating feed fluid heater and ORC incorporating both of the regenerator and feed fluid heater. ORC energy demand supplied by geothermal energy. A thermodynamic model (energy and exergy) of systems done. EES software used to model the systems. Also a parametric study done to investigate the effects of the performance parameters (energetic and exergetic) of considered systems. The results showed that ORC incorporating both regenerator and feed fluid heater with PEM electrolyzer had the maximum energy (3.514%) and exergy (68.93%) efficiency in comparison with other systems. Also it can be observed that evaporator and electrolyzer had the most portion of exergy destruction of the system. Energy efficiency, exergy efficiency, hydrogen production and net power increased by pressure growth in all systems. The amount of exergy efficiency, energy efficiency, hydrogen production and net power increased by the evaporator temperature addition in ORC incorporating regenerator with PEM electrolyzer and ORC incorporating both regenerator and feed fluid heater with PEM electrolyzer but their amount marginally decreased by the evaporator temperature addition in basic ORC incorporating with PEM electrolyzer and ORC incorporating feed fluid heater with PEM electrolyzer.