Thermodynamic innovation and optimization of a geothermal multigeneration system for sustainable hydrogen and water production

The application of renewable resources instead of fossil fuels has been considered a way to reduce carbon pollution in recent years. Geothermal energy is one of the renewable energy sources that harness the energy available in the Earth's layers to provide energy. Additionally, achieving high efficiency and optimizing the use of energy sources is one of the key challenges ahead to reduce environmental pollution. The use of multigenerational cycles is a suitable method for more optimal use of energy sources. In this study, a combined multigenerational geothermal cycle is examined from the perspectives of energy, exergy, economics, and the environment. The basis of the studied cycle is that a geothermal source is used to provide energy, and to utilize better the source used, an absorption cooling cycle, two organic Rankine cycles (ORC), two thermoelectric generators (TEG) units, a reverse osmosis (RO) desalination, and a Proton Exchange Membrane (PEM) electrolysis are used in the cycle. This cycle can generate electricity, cooling load, heat, hydrogen, and fresh water. The energy and exergy efficiencies of the cycle, as calculated after the investigation, were ۵۴.۲۴% and ۵۴.۷۴%, respectively. The net output power of this cycle is ۱۰۴.۸ kW, and its hydrogen and freshwater production rates are ۳۱.۲۳ kg/day and ۶ kg/h, respectively. The absorption refrigeration cycle produces a cooling load of ۱۶.۷۴ kW. The cycle also provides ۸۱۷.۷ kW of heat for residential applications.

کلیدواژه ها:

Geothermal Energy ، multigeneration system ، Exergy Efficiency ، Sustainability