THERMO-ECONOMIC OPTIMIZATION OF SOLAR-DRIVEN ORGANIC RANKINE CYCLE

Ma Piyin; Chai Junlin; Yang Fubin; Zhang Hongguang

doi:10.19912/j.0254-0096.tynxb.2023-0858

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (10) : 381-390. DOI: 10.19912/j.0254-0096.tynxb.2023-0858

THERMO-ECONOMIC OPTIMIZATION OF SOLAR-DRIVEN ORGANIC RANKINE CYCLE

Ma Piyin¹, Chai Junlin¹, Yang Fubin², Zhang Hongguang²

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Abstract

According to the heat collection characteristics of parabolic trough solar collector, R600 and R245fa are selected as circulating working fluids. The thermo-economic models of basic organic Rankine cycle （BORC） and the ORC system with internal heat exchanger （IHE-ORC） are established with the exergy efficiency and levelized energy cost （LEC） as objectives, respectively. Bi-objective optimization is conducted using the non-dominated sorting genetic algorithm. The optimal thermo-economic performance of two systems with two working fluids are obtained using TOPSIS with entropy weight method integrated. The variations of thermo-economic performance of the systems with evaporation pressure, superheat degree and condensation temperature are analyzed. The results show that, under optimization and decision making, when R245fa is used, IHE-ORC system has clear advantage in thermodynamic performance with the optimal exergy efficiency and LEC of 54.11% and 0.1548 $/kWh, respectively. When R600 is used, BORC system exhibits better economic performance with the optimal exergy efficiency and LEC of 49.89% and 0.1318 $/kWh, respectively. Within the variation range of operating parameters, the exergy efficiency and LEC of IHE-ORC system are always higher than those of BORC, and much higher exergy efficiency is obtained when using R245fa, while much lower LEC is achieved when using R600.

Key words

solar energy / Rankine cycle / genetic algorithms / parabolic trough solar collecor / thermodynamics / economy

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Ma Piyin, Chai Junlin, Yang Fubin, Zhang Hongguang. THERMO-ECONOMIC OPTIMIZATION OF SOLAR-DRIVEN ORGANIC RANKINE CYCLE[J]. Acta Energiae Solaris Sinica. 2024, 45(10): 381-390 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0858

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