Multi-Objective Optimization of ORC Systems and Performance Analysis under Off-Design Condition
Abstract: This paper takes thermal efficiency, energy efficiency and the Initial investment cost as the opti-mization object, compared the comprehensive performance of Organic Ranking Cycle (ORC) with recuperator, reheat Organic Ranking Cycle and Organic Ranking Cycle power generation systems which using R245fa as working fluid. The result suggests that Organic Ranking Cycle with recupe-rator is more suitable for the recovery of the low-temperature heat source on the given parameters. Analyses of characteristics under off-design condition are conducted under this foundation. When the goal is to maximize the output power for the energy recovery system, the heat source’s temperature changes have a significant impact on the system operating pressure; the net power output and the thermal efficiency increased with increasing heat source’s temperature or mass flow rate. However, the heat recovery efficiency with increasing temperature of the heat source increases, but with the increase of heat flow decreases. Its minimum value, 4.39%, is achieved for heat source temperature and mass flow rate equal to 423 K and 12 kg∙s−1, while its maximum value, 7.46%, is achieved for heat source temperature and mass flow rate equal to 473 K and 6 kg∙s−1.
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