Parametric Study of an ORC-EJR Cycle Based on Energy and Exergy Analysis for Power, Heating, Cooling, and Hydrogen Production

Document Type : Research Paper

Authors

1 Mechanical Engineering Department, Faculty of Engineering, Urmia University, Urmia, Iran

2 Faculty of Science and Engineering, Anglia Ruskin University, Chelmsford, UK

Abstract

Due to the environmental harm caused by fossil fuels and their limited availability, renewable resources have emerged as a viable alternative, driving extensive research in this field in recent years. Moreover, the adoption of integrated systems for power, cooling, heating, and hydrogen production has gained attention as an effective strategy to optimize the use of existing energy resources. In this study, a novel multigeneration system utilizing geothermal energy is introduced, with its performance modeled and analyzed. This innovative system integrates an ejector refrigeration cycle, an organic Rankine cycle, a local water heating unit, and a hydrogen generation system. The effects of various factors on the system's efficiency have been thoroughly examined. The results show that the system achieves energetic and exergetic efficiencies of 49.68% and 48.01%, respectively. The combined power output generated by the ORC turbine and a TEG is 499.89 kW. Additionally, the system produces a total of 166.9 kg of hydrogen daily, with a coefficient of performance (COP) of 0.355. Moreover, increasing the temperature of the geothermal fluid improves the exergetic efficiency, power generation, hydrogen production, and cooling load, while it reduces both the energetic efficiency and COP. Finally, it is concluded that increasing the geothermal mass flow rate leads to higher power generation, increased hydrogen production, a larger cooling load, and a decrease in both energy and exergy efficiencies.

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References

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Hydrogen, Fuel Cell & Energy Storage
Volume 12, Issue 2
March 2025
Pages 75-82

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