PERFORMANCE ANALYSIS OF NOVEL CASCADE ORGANIC RANKINE CYCLE SOLAR THERMAL POWER GENERATION SYSTEM

Tang Jingchun; Li Junhui; Li Jing; Li Pengcheng; Cao Qing; Zhang Xiuping

doi:10.19912/j.0254-0096.tynxb.2022-0068

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (6) : 308-314. DOI: 10.19912/j.0254-0096.tynxb.2022-0068

PERFORMANCE ANALYSIS OF NOVEL CASCADE ORGANIC RANKINE CYCLE SOLAR THERMAL POWER GENERATION SYSTEM

Tang Jingchun¹, Li Junhui¹, Li Jing², Li Pengcheng¹, Cao Qing³, Zhang Xiuping⁴

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Abstract

This paper presents a solar thermal power generation system based on two-stage heat storage tank and cascade organic Rankine cycle. The system can switch between rated and discharge modes according to the variation of solar radiation intensity, which ensures the stability and continuity of power generation. Biphenyl-diphenyl oxide mixture is adopted as the heat collection, thermal storage and power cycle fluid of the top organic Rankine cycle （ORC）, while benzene is used as the working fluid of the bottom ORC. Thermodynamic optimization of the system is carried out. The results indicate that the maximum thermal power conversion efficiency of 38.54% is achieved. The efficiency is even higher than those of the conventional solar power plants using synthetic oil as the heat carrier and dual-tank molten salts as the storage fluid. It manifests that the proposed system has a good application prospect.

Key words

solar thermal power generation / Rankine cycle / thermal efficiency / exergy loss / biphenyl-diphenyl oxide

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Tang Jingchun, Li Junhui, Li Jing, Li Pengcheng, Cao Qing, Zhang Xiuping. PERFORMANCE ANALYSIS OF NOVEL CASCADE ORGANIC RANKINE CYCLE SOLAR THERMAL POWER GENERATION SYSTEM[J]. Acta Energiae Solaris Sinica. 2023, 44(6): 308-314 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0068

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