Evaluation of a Modified Organic Rankine Cycle to Produce Power, Hydrogen and Desalinated water by Combining Geothermal and Biomass Energies from 4E viewpoints

This study provides the energy, exergy, economic and environmental (4E) analysis of an organic Rankine cycle with the aim of producing power, hydrogen, and desalinated water with combined geothermal and biomass energy sources. In the proposed system, different heat exchangers have been used to increase the exergy efficiency of the system. Also, the cycle performance in both modes of with and without geothermal energy is compared. The results provide that the highest rate of exergy destruction is equal to 119.4 kW which is related to the boiler. Also, the lowest amount of exergoeconomic factor for the boiler is equal to 12.31%. The amount of produced hydrogen and desalinated water is equal to 1.58 lit/s and 15.15 kg/s, respectively. Moreover, with an increment in the temperature of the geothermal source from 125 to 160 C, the production rate of hydrogen and desalinated water are increased 30 and 18 %, respectively. In the case that geothermal energy is not used and all energy is supplied from biomass, the amount of carbon dioxide emission will increase by 68%.