Abstract
In the present work, we have conducted thermodynamic analysis of an organic Rankine cycle (ORC) using waste heat from intercooler and regenerator in Brayton cycle with intercooling, reheating, and regeneration (BCIRR). First of all, the first law analysis is used in this combined cycle. Several outputs are revealed in this study such as the cycle efficiencies in Brayton cycle which is dependent on turbine inlet temperature, intercooler pressure ratios, and pinch point temperature difference. For all cycles, produced net power is increased because of increasing turbine inlet temperature. Since heat input to the cycles takes place at high temperatures, the produced net power is increased because of increasing turbine inlet temperature for all cycles. The thermal efficiency of combined cycle is higher about 11.7% than thermal efficiency of Brayton cycle alone. Moreover, the net power produced by ORC has contributed nearly 28650 kW. The percentage losses of exergy for pump, turbine, condenser, preheater I, preheater II, and evaporator are 0.33%, 33%, 22%, 23%, 6%, and16% respectively. The differences of pinch point temperature on ORC net power and efficiencies of ORC are investigated. In addition, exergy efficiencies of components with respect to intercooling pressure ratio and evaporator effectiveness is presented. Exergy destructions are calculated for all the components in ORC.
Highlights
Thermal energy systems as well as corresponding all parts have been challenged to improve overall efficiency due to lack of conventional fuels, reduce climate change and so on for recent years
He et al investigated 22 working fluids of subcritical organic Rankine cycle (ORC) for waste heat recovery in order to find out optimum temperature for evaporation
The results show that the ORC type together with the input inlet pressure increase the net power and thermal efficiency of the ORC and achieve optimal values at a given pressure based on the optimum criterion
Summary
Thermal energy systems as well as corresponding all parts have been challenged to improve overall efficiency due to lack of conventional fuels, reduce climate change and so on for recent years. Eveloy et al have presented solid oxide fuel cell-gas turbine-ORC combined cycle both thermodynamic and economic perspectives They have used six different working fluids such as toluene, benzene, cyclohexane, cyclopentane, R123 and R245fa in this cycle and they have performed energy and exergy analysis. Camporeale et al have made energy analysis of externally fired gas turbine and organic Rankine combined cycle, and they conducted various bottoming cycles to bring about the effects of evaporation pressure and superheating temperature of the system They have used various organic fluids such as siloxanes and toluene to examine effects on the plant performance [17]. Hajabdollahi et al have designed an optimum organic Rankine Cycle for diesel engine waste heat recovery They selected various refrigerants such as R123, R134a, R245fa and R22, and from both economic and thermodynamic perspectives, R123 is determined as the best working fluid compared to others [22].
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