A modified hydrogen liquefaction cycle integrated with geothermal energy and an absorption refrigeration cycle

Scientific discussions are gaining momentum on renewable energy, geothermal energy in specific. Researchers are seeking to propose different methods for energy storage systems that are more efficient and environment-friendly. The objective here is to propose an innovative approach where geothermal energy is consumed to fulfill different requirements first, and be stored in liquid hydrogen and consumed cold energy generated from geothermal sources through an absorption refrigeration cycle for pre-cooling, next. This liquid hydrogen is gasified before entering the liquefaction cycle. This multipurpose system produces hot water, freshwater, and power through geothermal energy. The geothermal flow enters the ammonia water absorption cooling unit, first, where its temperature is reduced, and enters the organic Rankine power generation unit equipped with a heat exchanger to produce hot water. The system is assessed by running energy, exergy, and economic analyses, with a focus on the hydrogen liquefaction cycle. The total estimated annual cost of the system is 1.62 million, with a minimum selling price of 2.96. The specific energy consumption in the multipurpose system is computed as 8.78 kWh p/kg of liquid hydrogen produced.

A modified hydrogen liquefaction cycle integrated with geothermal energy and an absorption refrigeration cycle Keywords:

Hydrogen , Geothermal , Solar Energy , PEM , Water-ammonia absorption