Proposing a Hydrogen Liquefaction Cycle for Geothermal Energy Storage in an Innovative Multi-Generation System

Document Type : Research Paper

Authors

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

2 Department of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iran

3 Department of Mechanical Engineering, Imam Khomeini International University, Qazvin, Iran

4 Department of Mechanical and Aerospace Engineering, Polytechnic University of Turin, Italy

Abstract

Energy storage has become a critical focus area, especially within the renewable energy sector. Among these, geothermal energy has gained attention for its environmentally friendly characteristics. Researchers are increasingly working to develop more efficient energy storage systems using a variety of innovative methods. This research project focuses on two core aspects: the innovative use of geothermal energy to produce liquid hydrogen for storage and the application of geothermal cooling via an absorption refrigeration cycle to cool hydrogen gas. The proposed multi-generation system leverages geothermal energy to generate hot water, fresh water, hydrogen, and power. As the geothermal flow passes through the ammonia water absorption cooling unit, its temperature is reduced before it enters the organic Rankine cycle power generation unit and heat exchanger, where it is used to produce power and hot water. The system is thoroughly analyzed using energy, exergy, and economic assessments, with a specific focus on the hydrogen liquefaction unit. The total annual cost of the system is estimated at 1.49$ million, with a minimum selling price of 2.71$ per kilogram. The specific energy consumption of the multi-generation system is calculated to be 8.51 kWh per kilogram of liquid hydrogen.

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References

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Hydrogen, Fuel Cell & Energy Storage
Volume 12, Issue 1
January 2025
Pages 1-8

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