Thermodynamic Modeling and Analysis of a Solar and Geothermal-driven Multigeneration System Using TiO۲ and SiO۲ Nanoparticles

In this study, renewable energy sources including a high-temperature solar parabolic trough collector and geothermal water integrated with a modified Kalina cycle, a combined ORC-EJR cycle, an electrolyzer, an RO desalination unit, and a domestic water heater. SiO۲ and TiO۲ nanoparticles dissolved in Therminol VP۱ are applied as the working fluid of the solar collector. A comparative analysis of introduced working fluids is performed from energy, exergy as well as cost analysis point of view to evaluate their efficiencies. Solar irradiation, ambient temperature, and collector inlet temperature were the parameters investigated to discover their effects on energy and exergy efficiency, solar collector outlet temperature, hydrogen production rate, and freshwater production rate. The highest generated outlet temperature of the solar collector outlet was ۶۹۳.۸ K obtained by Therminol VP۱/SiO۲ nanofluid. The maximum energy and exergy efficiencies of the proposed system were ۳۶.۶۹ % and ۱۷.۷۶ %, respectively. Moreover, it is found that by increasing the solar collector inlet temperature, the hydrogen production rate decreases while the water production rate increases.