4E analysis of a geothermal-based multigeneration system

Articles in Press

Document Type : Research Paper

Authors

Mechanical Engineering Department, Urmia University, Iran

10.22104/hfe.2025.7613.1359

Abstract

A new geothermal multisource energy system is assessed in this research upon a comprehensive 4E framework of the Energy, Exergy, Economic, and Environmental aspects. The system integrates numerous technologies for energy conversion and use, which includes an Organic Rankine Cycle (ORC) coupled with a Thermoelectric Generator (TEG), a Single-Effect Absorption Chiller (SEAC), a Proton Exchange Membrane (PEM). A distinct benefit of the system is its use of a TEG instead of the usual condenser, allowing waste heat to be converted into extra electricity via the Seebeck effect, thus enhancing the efficiency of energy conversion without using extra power. The multigeneration system is designed to produce electricity, heating, cooling, hydrogen and freshwater which makes it perfect for regions endowed with geothermal resources and various energy demands. The simulation results demonstrating a comprehensive thermodynamic simulation indicate that the system has 66.42% energy efficiency and 77.12% exergy efficiency. Based upon exergoeconomic analysis, the capital and maintenance expenditure is mainly financed by the turbines and also the geothermal unit, with a scope for improvement on the heat exchangers and condensers. In general, activity environment index of the system 0.03206 corresponds to negligible ecological disturbance, and its exergy sustainability coefficient is 0.0711, which points out the possibility of further enhancement of sustainability. This geothermal setup is poised excellently as an efficient, sustainable and multipurpose energy solution as per results.

Keywords

Main Subjects

Hydrogen, Fuel Cell & Energy Storage

Articles in Press, Accepted Manuscript
Available Online from 08 December 2025

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