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Study on the performance of multi-mode photovoltaic/thermal-assisted air-source heat pump system and its application potential in Tibet

Author

Listed:
  • Wan, Zhihao
  • Li, Pengxiang
  • Liu, Sujie
  • Zhang, Huan
  • Fan, Xianwang
  • Wang, Zhaoying
  • Pu, Jiaxuan
  • Jurasz, Jakub
  • Huo, Tianzhuo
  • Zheng, Wandong

Abstract

Given the abundant solar resources and low humidity in Tibet, integrating photovoltaic/thermal (PVT) modules with air-source heat pumps (ASHPs) presents a promising alternative to traditional biomass combustion for space heating. However, existing PVT modules are often structurally complex and coupled with ASHPs in a single operating mode, either preheating mode, series mode, or parallel mode. To address these limitations, this study proposes a novel multi-mode PVT-assisted ASHP system (PVT-ASHPS) incorporating a simplified perforated absorber plate. A mathematical model is then established and experimentally validated. By analyzing the impacts of solar irradiance, outdoor air temperature and heating load across different operating modes, optimal energy efficiency areas are identified for each mode. The system's application potential is further evaluated through comparison with other heating systems. Results show that increased solar irradiance or outdoor air temperature decreases system power consumption, contrary to the effect of rising heating load. Although preheating mode elevates the evaporating temperature, greater energy savings are achieved in series and parallel modes by actively lowering the ASHP's required heating capacity. Under constant outdoor air temperatures, the optimal operating mode shifts from preheating mode to series mode as solar irradiance increases, returns briefly to preheating mode, and finally switches to parallel mode. Using a typical rural residence in Tibet as a case study, the PVT-ASHPS exhibits superior performance with an electricity-to-heat ratio of 0.2, yielding annual energy savings of 9524 kW h and a 76.7 % reduction in CO2 emission compared to conventional systems. The findings provide valuable insights for promoting clean heating and enhancing solar energy utilization in Tibet.

Suggested Citation

  • Wan, Zhihao & Li, Pengxiang & Liu, Sujie & Zhang, Huan & Fan, Xianwang & Wang, Zhaoying & Pu, Jiaxuan & Jurasz, Jakub & Huo, Tianzhuo & Zheng, Wandong, 2026. "Study on the performance of multi-mode photovoltaic/thermal-assisted air-source heat pump system and its application potential in Tibet," Energy, Elsevier, vol. 342(C).
    • Handle: RePEc:eee:energy:v:342:y:2026:i:c:s0360544225052387
    DOI: 10.1016/j.energy.2025.139596
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