A seasonally efficient cogeneration system based on medium-temperature PV/T-ORC

Gangqiang Dang, Xiao Ren, Liang Gong, Yifan Zhang, Jingrui Liang, Jing Li and Gang Pei

Energy, 2025, vol. 316, issue C

Abstract: Solar photovoltaic and thermal comprehensive utilization (PV/T) technology has particular potential in the field of renewable co-generation of electricity and heat. However, the structure and technical limitations cause the traditional PV/T systems to be mainly used in low-temperature applications. Moreover, they have an obvious supply-demand imbalance between the variation of solar radiation and user's needs. Therefore, this paper proposes a novel medium-temperature PV/T to improve the system's efficiency and energy grade and combines it with organic Rankine cycle (ORC) system to solve the problem of the mismatch between supply and demand through an efficient operation strategy. The results show that when the inlet temperature is 85.0 °C, the overall energy and exergy efficiency of the novel PV/T system can reach 26.85 % and 6.97 %, which are higher than that of the traditional PV/T system with 22.05 % and 6.07 %. Besides, the levelized cost of energy and energy payback period are 0.117 USD/kWh and 6.19 years, respectively. Meanwhile, for the PV/T-ORC system, 6814.44 kWh of electricity and 13576.06 MJ of heat energy are generated by one year, and 18.7 % of heating energy is saved for a 130 m2 residential building in Lhasa. Finally, 1311.18 tons of net CO2 emissions can be reduced.

Keywords: Medium-temperature PV/T; Vacuum tube; Economic analysis; Organic Rankine cycle; Operation strategy (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:316:y:2025:i:c:s0360544225001240

DOI: 10.1016/j.energy.2025.134482

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