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The organic Rankine cycle (ORC) is considered as one of the most viable technology to recover low-grade waste heat. A multi-objective optimization model is established to simultaneously derive the maximum exergy efficiency and the minimum electricity production cost (EPC) of a specific ORC system by employing the genetic algorithm (GA). Evaporation temperature and condensation temperature are selected as decision variables. At first, variations of exergy efficiency and EPC with evaporation temperature and condensation temperature are investigated respectively using R245fa, R245ca, R600, R600a, R601 and R601a as working fluids. Subsequently, a multi-objective optimization is performed and the Pareto frontiers for various working fluids are obtained. Results indicate that performance of the specific ORC system with R245fa as working fluid is better that with other working fluids.
Ruijie Wang; Jingquan Zhao; Lei Zhu; Guohua Kuang. Multi-Objective Optimization of Organic Rankine Cycle for Low-Grade Waste Heat Recovery. E3S Web of Conferences 2019, 118, 03053 .
AMA StyleRuijie Wang, Jingquan Zhao, Lei Zhu, Guohua Kuang. Multi-Objective Optimization of Organic Rankine Cycle for Low-Grade Waste Heat Recovery. E3S Web of Conferences. 2019; 118 ():03053.
Chicago/Turabian StyleRuijie Wang; Jingquan Zhao; Lei Zhu; Guohua Kuang. 2019. "Multi-Objective Optimization of Organic Rankine Cycle for Low-Grade Waste Heat Recovery." E3S Web of Conferences 118, no. : 03053.
The performance of a 300 kW organic Rankine cycle (ORC) prototype was experimentally investigated for low-grade waste heat recovery in industry. The prototype employed a specially developed single-stage radial turbine that was integrated with a semi-hermetic three-phase asynchronous generator. R245fa was selected as the working fluid and hot water was adopted to imitate the low-grade waste heat source. Under approximately constant cooling source operating conditions, variations of the ORC performance with diverse operating parameters of the heat source (including temperature and volume flow rate) were evaluated. Results revealed that the gross generating efficiency and electric power output could be improved by using a higher heat source temperature and volume flow rate. In the present experimental research, the maximum electric power output of 301 kW was achieved when the heat source temperature was 121 °C. The corresponding turbine isentropic efficiency and gross generating efficiency were up to 88.6% and 9.4%, respectively. Furthermore, the gross generating efficiency accounted for 40% of the ideal Carnot efficiency. The maximum electric power output yielded the optimum gross generating efficiency.
Ruijie Wang; Guohua Kuang; Lei Zhu; Shucheng Wang; Jingquan Zhao. Experimental Investigation of a 300 kW Organic Rankine Cycle Unit with Radial Turbine for Low-Grade Waste Heat Recovery. Entropy 2019, 21, 619 .
AMA StyleRuijie Wang, Guohua Kuang, Lei Zhu, Shucheng Wang, Jingquan Zhao. Experimental Investigation of a 300 kW Organic Rankine Cycle Unit with Radial Turbine for Low-Grade Waste Heat Recovery. Entropy. 2019; 21 (6):619.
Chicago/Turabian StyleRuijie Wang; Guohua Kuang; Lei Zhu; Shucheng Wang; Jingquan Zhao. 2019. "Experimental Investigation of a 300 kW Organic Rankine Cycle Unit with Radial Turbine for Low-Grade Waste Heat Recovery." Entropy 21, no. 6: 619.