Performance Analysis and Working Fluids Selection of Organic Rankine Cycle in a Triple Power Generation System Combined with Gas Turbine and Solid Oxide Fuel Cell Cycles

The main target of this research is to model, analyze, and compare the performance of two hybrid systems,, 1. A gas turbine (GT) and steam Turbine (ST) plus a solid oxide fuel cell (SOFC) and 2. a hybrid GT, ORC, and SOFC cycle (SOFC+ GT+ ORC) from the thermodynamic and exergy perspectives. Studies show that the output power of a combined system with a steam cycle is higher than that of a system with an organic Rankine cycle, but this higher output does not necessarily mean that this cycle performs better. Therefore, a steam cycle at a higher power range and turbine inlet gas temperature is more justified. The results show that among the analyzed fluids, the use of toluene fluid in the organic Rankine cycle produces the most power at a condenser temperature of 319 Kelvin.