Thermo-economic optimization of organic Rankine cycle with steam-water dual heat source

Shiqi Wang, Zhongyuan Yuan and Nanyang Yu

Energy, 2023, vol. 274, issue C

Abstract: Dual-loop ORC (D-ORC) and single-loop ORC (S-ORC) systems can be employed to steam-water waste heat recovery. The maximum net output power and minimum electricity production cost (EPC) are considered as optimization objectives. To optimize the thermo-economic performance and obtain the Pareto front, non-dominated sorting genetic algorithm-II is employed, and the decision is made by TOPSIS and entropy weight method (EWM). The results show that the EPC of the S-ORC system is lower than that of the D-ORC system under any heat source condition. However, the net output power of the S-ORC system exceeds that of the D-ORC system when the steam mass flow rate and hot water inlet temperature are 10 kg/s and 110 °C, respectively. When the steam mass flow rate or the hot water inlet temperature is higher, the S-ORC system has more distinct advantages in terms of thermo-economic performance. When the working fluid at the outlet of hot water preheater of the S-ORC system is in a two-phase state, the optimal steam outlet pressure is invariably the lowest for operation, and cost can be reduced by removing the steam preheater. In the D-ORC system, the optimal steam outlet pressure is consistently the lowest allowable pressure.

Keywords: Organic rankine cycle; Thermo-economic optimization; NSGA-II; Steam–water heat source (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:274:y:2023:i:c:s0360544223007521

DOI: 10.1016/j.energy.2023.127358

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