Exergy and energy analysis of a combined cooling, heat, hydrogen and power generation system utilizing geothermal energy

Al-Aayedi, Ahmed Raad Ali; Khalilian, Morteza; Chitsaz, Ata; Mirzaee, Iraj; Shirvani, Hassan

doi:10.22104/hfe.2025.7273.1332

Exergy and energy analysis of a combined cooling, heat, hydrogen and power generation system utilizing geothermal energy

Articles in Press

Document Type : Research Paper

Authors

Ahmed Raad Ali Al-Aayedi ¹

Morteza Khalilian ¹

Ata Chitsaz ¹

Iraj Mirzaee ²

Hassan Shirvani ³

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

² Mechanical Engineering Department, Faculty of Engineering, Urmia University, Urmia, Iran

³ Faculty of science and Engineering, Anglia Ruskin University, Chelmsford, UK

10.22104/hfe.2025.7273.1332

Abstract

The organic Rankine cycle and an ejector refrigeration cycle (ORC-EJR) are combined in this work to create a unique multigeneration cycle that is investigated from a thermodynamic standpoint. The system can produce heat, cooling, power, and hydrogen. Geothermal energy is used in this suggested design as a sustainable energy source. It is cost-effective and energy waste-free to use a renewable energy source to produce many outputs. Furthermore, this system generates additional electricity by using a thermoelectric generator (TEG) unit in place of the condenser. After analysing, it is found that increasing the turbine inlet pressure leads to improvements in all evaluated parameters, such as energy and exergy efficiency, cooling load, COP, power output, and hydrogen production rate. Moreover, an elevation in turbine inlet pressure loads to diminished energy and exergy efficiencies, lowered power generation output, and reduced hydrogen production rates. Furthermore, an enhancement in the TEG’s figure of merit results in better energy and exergy efficiencies for the system, as well as increased power and hydrogen production rates. Finally, it is approved that the preheater exhibits the highest rate of exergy destruction rate among the systems examined.

Keywords

Geothermal energy

TEG

Figure of merit

COP

Subjects