The Effect of Using an ETC Collector on Increasing the Geothermal Fluid Temperature in a Multigeneration System

Document Type : Research Paper

Authors

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

Abstract

The research presents a new power generation system which combines geothermal power with solar capabilities, providing a sustainable and efficient energy production solution. The system relies on an evacuated tube collector (ETC) to heat geothermal fluid before it is used in various subsystems. Raising the temperature is crucial for enhancing the operational efficiency of various subsystems within the system. The multigeneration setup consists of five coordinated units, including an ORC electricity generator that produces power while also supplying energy for two subsystems: double-effect absorption cooling and domestic thermal heating to meet energy demand. The integrated system operates PEM electrolyzers alongside hydrogen production and operates reverse osmosis units to generate freshwater through desalination process. The study results indicate that increasing the solar energy received by the collector significantly enhances the overall system performance. As solar energy increases, both the power output and the collector outlet temperature improve. The system’s performance efficiency directly depends on outlet collector temperature, which affects both hydrogen and freshwater production rates. Raising the solar radiation intensity makes the ETC produce more energy and exergy, leading to enhanced overall system operation. Among the tested working fluids, R600 exhibits the best performance, producing 55.16 kg/day of hydrogen and delivering 1.451 kg/s of freshwater -- outperforming other fluids in both categories.

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References

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Hydrogen, Fuel Cell & Energy Storage
Volume 13, Issue 1
January 2026
Pages 67-74

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