Thermodynamic Simulations of Exergy Efficiency in Organic Rankine Cycle (ORC) Based On Exergy System
Keywords:
Gasification, Pyrolysis , Combustion , Thermodynamic simulation , Exergy efficiencyAbstract
Exergy analysis in a biomass-powered cycle is vital, especially when involving thermo-chemical conversion technologies like gasification and pyrolysis. These involve complex analyses and have comparative advantages to combustion techniques in power generation. This study conducted a thermodynamic simulation of the exergy efficiency of a novel ORC with turbine bleeding for tri-generation to ascertain the optimal intrinsic values and their real-time boundaries for efficient power output. The study employed a replication method with a developed soft template written source code in Engineering Equation Solver (EES) compared to inconsistent and untactful productivity identified with energy-sapping blue-collar analysis of the system that was invoked hitherto, using three working fluids: , and bounded by environmental and safety standards, and valuable temperatures, pressures and mass flow rates. The results showed that exergy efficiencies for , and were recorded as , and respectively. In contrast, the generic ORC without turbine bleeding with the same configuration had corresponding respective efficiencies of , and which were relatively low, particularly with respect to ORC system without cooling, and having respective efficiency improvement of , and Additionally, the total output power was for , for and for having turbine inlet temperatures spread between in general. Based on the evaluated thermodynamic properties and their output, especially enthalpy, entropy and exergy destruction, is given preference, with the highest overall efficiency, followed by then in that order. The designed ORC system has the potential for medium temperature relevance with agricultural wastes and for biomass energy utilisation with reduced vent gases compared to most ORC systems used for low-grade heat sources such as geothermal and solar applications, which are wasted as thermal pollution.
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