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Experimental study on the switching logic of a photovoltaic solar-assisted loop thermosiphon /heat pump hybrid system in enthalpy difference laboratory

Author

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  • Zhang, Tao
  • Feng, Shijing
  • Zhai, Jinming
  • Shi, Zhengrong
  • Ji, Jie

Abstract

Combining active or passive two-phase heat transfer methods such as heat pump (HP) and loop thermosyphon (LT) into a photovoltaic/thermal (PV/T) system could overcome freezing and corrosion issues commonly found in water-cooled PV/T collectors. However, HPs waste solar energy resources under sunny meteorological conditions, while LTs cannot satisfy temperature demands under cloudy or rainy meteorological conditions. Hence, combining the above two methods can provide more efficient operation. In this study, a prototype of the hybrid system named photovoltaic solar-assisted loop thermosiphon/heat pump (PV-SALT/HP) was proposed and constructed for the first time. The PV-SALT/HP system could independently operate in LT-PV/T or PV-SAHP modes and could realize the switching operation. The performance and switching logic of PV-SALT/HP system in various operation modes under four typical meteorological conditions were revealed through massive experiments. Particularly, an enthalpy difference laboratory with a solar simulator was applied to manage meteorological conditions. Furthermore, the switching logic decided by water temperatures of PV-SALT/HP system was evaluated based on its fitted performance. Results revealed that to satisfy users' water temperature demands, LT-PV/T mode realized it only under meteorological condition of 600 W/m2 & 30 °C; as for PV-SAHP mode, it only consumed 172.5–330 min, which was much shorter than the average daily radiation time. Under meteorological condition of 400 W/m2 & 30 °C, PV-SALT/HP system demonstrated an optimal switching water temperature of 36.0 °C. Moreover, under meteorological conditions of 400 W/m2 & 20 °C and 600 W/m2 & 20 °C, the optimal switching water temperatures, which were determined based on fitting formulas, were 29.0 °C and 44.0 °C, respectively. The above switching temperatures simultaneously balance temperature demands, full utilization of solar radiation, and energy-saving under different meteorological conditions.

Suggested Citation

  • Zhang, Tao & Feng, Shijing & Zhai, Jinming & Shi, Zhengrong & Ji, Jie, 2025. "Experimental study on the switching logic of a photovoltaic solar-assisted loop thermosiphon /heat pump hybrid system in enthalpy difference laboratory," Renewable Energy, Elsevier, vol. 239(C).
    • Handle: RePEc:eee:renene:v:239:y:2025:i:c:s0960148124022444
    DOI: 10.1016/j.renene.2024.122176
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    1. Chen, Hongbing & Zhang, Lei & Jie, Pengfei & Xiong, Yaxuan & Xu, Peng & Zhai, Huixing, 2017. "Performance study of heat-pipe solar photovoltaic/thermal heat pump system," Applied Energy, Elsevier, vol. 190(C), pages 960-980.
    2. Chien, C.C. & Kung, C.K. & Chang, C.C. & Lee, W.S. & Jwo, C.S. & Chen, S.L., 2011. "Theoretical and experimental investigations of a two-phase thermosyphon solar water heater," Energy, Elsevier, vol. 36(1), pages 415-423.
    3. Li, Hong & Sun, Yue, 2019. "Performance optimization and benefit analyses of a photovoltaic loop heat pipe/solar assisted heat pump water heating system," Renewable Energy, Elsevier, vol. 134(C), pages 1240-1247.
    4. Ren, Xiao & Yu, Min & Zhao, Xudong & Li, Jing & Zheng, Siming & Chen, Fucheng & Wang, Zhangyuan & Zhou, Jinzhi & Pei, Gang & Ji, Jie, 2020. "Assessment of the cost reduction potential of a novel loop-heat-pipe solar photovoltaic/thermal system by employing the distributed parameter model," Energy, Elsevier, vol. 190(C).
    5. Zhou, Jinzhi & Zhao, Xudong & Ma, Xiaoli & Qiu, Zhongzhu & Ji, Jie & Du, Zhenyu & Yu, Min, 2016. "Experimental investigation of a solar driven direct-expansion heat pump system employing the novel PV/micro-channels-evaporator modules," Applied Energy, Elsevier, vol. 178(C), pages 484-495.
    6. Ji, Yasheng & Zhou, Jinzhi & Zhao, Kaiming & Zhang, Nan & Lu, Lin & Yuan, Yanping, 2023. "A novel dual condensers heat pipe photovoltaic/thermal (PV/T) system under different climate conditions: Electrical and thermal assessment," Energy, Elsevier, vol. 278(PB).
    7. Zhang, Penglei & Wang, Baolong & Shi, Wenxing & Li, Xianting, 2015. "Experimental investigation on two-phase thermosyphon loop with partially liquid-filled downcomer," Applied Energy, Elsevier, vol. 160(C), pages 10-17.
    8. Zhang, Tao & Zhang, Yufan & Shi, Zhengrong & Pei, Gang & Cai, Jingyong, 2022. "Preliminary investigation on the switching time of a photovoltaic solar-assisted heat-pump/heat-pipe hybrid system," Applied Energy, Elsevier, vol. 324(C).
    9. Ding, Tao & Chen, Xiaoxuan & Cao, Hanwen & He, Zhiguang & Wang, Jianmin & Li, Zhen, 2021. "Principles of loop thermosyphon and its application in data center cooling systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 150(C).
    10. Shao, Nina & Ma, Liangdong & Zhang, Jili, 2020. "Experimental investigation on the performance of direct-expansion roof-PV/T heat pump system," Energy, Elsevier, vol. 195(C).
    11. Zhang, T. & Zhang, Y.F. & Shi, Z.R. & Li, Q.F. & Cai, J.Y., 2023. "Experimental study of a photovoltaic solar-assisted heat pump/gravity-assisted heat pipe hybrid system," Renewable Energy, Elsevier, vol. 207(C), pages 147-161.
    12. Yu, Min & Chen, Fucheng & Zheng, Siming & Zhou, Jinzhi & Zhao, Xudong & Wang, Zhangyuan & Li, Guiqiang & Li, Jing & Fan, Yi & Ji, Jie & Diallo, Theirno M.O. & Hardy, David, 2019. "Experimental Investigation of a Novel Solar Micro-Channel Loop-Heat-Pipe Photovoltaic/Thermal (MC-LHP-PV/T) System for Heat and Power Generation," Applied Energy, Elsevier, vol. 256(C).
    13. Zhang, Xingxing & Zhao, Xudong & Shen, Jingchun & Xu, Jihuan & Yu, Xiaotong, 2014. "Dynamic performance of a novel solar photovoltaic/loop-heat-pipe heat pump system," Applied Energy, Elsevier, vol. 114(C), pages 335-352.
    14. Gang, Pei & Huide, Fu & Huijuan, Zhu & Jie, Ji, 2012. "Performance study and parametric analysis of a novel heat pipe PV/T system," Energy, Elsevier, vol. 37(1), pages 384-395.
    15. Obalanlege, Mustapha A. & Mahmoudi, Yasser & Douglas, Roy & Ebrahimnia-Bajestan, Ehsan & Davidson, John & Bailie, David, 2020. "Performance assessment of a hybrid photovoltaic-thermal and heat pump system for solar heating and electricity," Renewable Energy, Elsevier, vol. 148(C), pages 558-572.
    16. Zhang, Xingxing & Zhao, Xudong & Xu, Jihuan & Yu, Xiaotong, 2013. "Characterization of a solar photovoltaic/loop-heat-pipe heat pump water heating system," Applied Energy, Elsevier, vol. 102(C), pages 1229-1245.
    17. Zhang, Tao & Yan, Zhiwei & Pei, Gang & Zhu, Qunzhi & Ji, Jie, 2019. "Experimental optimization on the volume-filling ratio of a loop thermosyphon photovoltaic/thermal system," Renewable Energy, Elsevier, vol. 143(C), pages 233-242.
    18. Ji, Jie & Liu, Keliang & Chow, Tin-tai & Pei, Gang & He, Wei & He, Hanfeng, 2008. "Performance analysis of a photovoltaic heat pump," Applied Energy, Elsevier, vol. 85(8), pages 680-693, August.
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