Performance Evaluation and Working Fluid Screening of Direct Vapor Generation for Solar ORC Using Low-Global Warming Potential (GWP) Working Fluids

Youtao Jiang, Xunda Zhang (), Zhengao Zhang, Lei Hao, Zhaozhi Cao, Shuyang Li, Bowen Guo, Yawen Zheng, Chunhai Dong and Li Zhao
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Youtao Jiang: State Grid Tianjin Power Company, Tianjin 300350, China
Xunda Zhang: State Grid Tianjin Electric Power Company Electric Power Scientific Research Institute, Tianjin 300350, China
Zhengao Zhang: State Grid Tianjin Power Company, Tianjin 300350, China
Lei Hao: State Grid Tianjin Power Company, Tianjin 300350, China
Zhaozhi Cao: State Grid Tianjin Power Company, Tianjin 300350, China
Shuyang Li: State Grid Tianjin Electric Power Company Electric Power Scientific Research Institute, Tianjin 300350, China
Bowen Guo: State Grid Tianjin Electric Power Company Electric Power Scientific Research Institute, Tianjin 300350, China
Yawen Zheng: State Grid Tianjin Electric Power Company Electric Power Scientific Research Institute, Tianjin 300350, China
Chunhai Dong: State Grid Tianjin Power Company Material Company, Tianjin 300350, China
Li Zhao: State Key Laboratory of Engines, Tianjin University, Tianjin 300350, China

Energies, 2024, vol. 17, issue 13, 1-14

Abstract: Traditional working fluids used in direct vapor generation for solar organic Rankine cycle (DVG-ORC) systems have a high global warming potential (GWP), making it imperative to find environmentally friendly alternative working fluids for these systems. This paper evaluates the performance of the DVG-ORC system under different operating conditions. By comparing the results of traditional working fluids with those of low-GWP fluids, the feasibility of using low-GWP fluids as alternative working fluids is explored. Additionally, to screen the working fluids suitable for this system further, the system is optimized with net output power as the objective function. The results show that evaporation temperature has different impacts on system performance. R245ca and R1336mzz(Z) exhibit higher net output power at different evaporation temperatures, with R1336mzz(Z) only reducing it by 3.73–5.26% compared to R245ca. However, an increase in condensation temperature negatively affects system performance, leading to a decrease in net output power and various efficiencies. Net output power increases with an increase in mass flow rate, indicating that higher mass flow rates can enhance system performance. The optimization results show that the net output power of low-GWP working fluid R1336mzz(Z) decreases by only 3.44% compared to R245ca, which achieves the maximum net output power. Moreover, among low-GWP working fluids, R1336mzz(Z) demonstrates the highest ORC efficiency and system efficiency, making it the most suitable working fluid for the DVG-ORC system due to its environmental friendliness and safety.

Keywords: direct vapor generation; organic Rankine cycle; system performance; low GWP; working fluid screening (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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