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Integrated PV-PCM electric film used in building envelope for solar heating: modelling, testing and application in Qinghai-Tibet Plateau

Author

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  • Li, Jin
  • Liu, Yiheng
  • Yi, Chang
  • Zhang, Yin

Abstract

The Qinghai-Tibet Plateau, characterized by a cold climate and prolonged heating periods, presents an opportunity for energy conservation through the implementation of a multi-energy complementary system that primarily utilizes solar energy, supplemented by electric heating. Despite the region's abundant solar resources, challenges such as uneven spatial and temporal distribution of solar energy, supply-demand mismatches, and complex control strategies persist. Moreover, existing research lacks long-term evaluations of heating systems' operational effectiveness in this area. To address these issues, this paper proposes a household energy system that meets heating, lighting, and hot water needs for remote rural households, using a photovoltaic (PV) and electric heating phase change thermal storage wall. An experimental platform in the Lhasa area enables measurements during the heating season, facilitating the development of a control strategy and an energy efficiency evaluation method. The assessment reveals that the system can achieve an operational efficiency of 71.4 %, with solar energy contributing 100 % to the heating branch, thus eliminating grid electricity consumption for heating. Additionally, the system reaches working and overall conversion efficiencies of 16.6 % and 84.1 %, respectively, while optimizing the thermal storage layer to about 2 cm to reduce investment costs. This research offers valuable insights for promoting energy-saving practices in buildings across the Qinghai-Tibet Plateau.

Suggested Citation

  • Li, Jin & Liu, Yiheng & Yi, Chang & Zhang, Yin, 2025. "Integrated PV-PCM electric film used in building envelope for solar heating: modelling, testing and application in Qinghai-Tibet Plateau," Renewable Energy, Elsevier, vol. 250(C).
    • Handle: RePEc:eee:renene:v:250:y:2025:i:c:s0960148125009140
    DOI: 10.1016/j.renene.2025.123252
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    References listed on IDEAS

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