TAGRA 2025

In recent years, there has been a growing emphasis on the use of sustainable energy resources to reduce carbon emissions and improve energy efficiency. In this study, an energy and exergy analysis of a trigeneration system consisting of a double-flash geothermal cycle, a domestic water heater (DWH) system, and a humidification- dehumidification (HDH) desalination unit has been investigated. This system, powered by a renewable geothermal energy source, produces three distinct outputs: electrical power, domestic hot water, and potable water. The results of the analysis indicate that under baseline conditions, the net power output, freshwater production rate, energy efficiency, and exergy efficiency of the proposed system are 49.06 kW, 0.2392 kg/s, 47.6%, and 58.06%, respectively. In addition, the thermal power of the domestic hot water was found to be 329.6 kW. The exergy analysis also reveals that the highest share of exergy destruction occurs in components subjected to high temperature differences and irreversible conversion processes. These findings suggest that optimizing thermal design and reducing exergy losses can enhance the overall performance and promote more sustainable utilization of geothermal energy resources.