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Numerical analysis on the advantages of evacuated gap insulation of vacuum-water flow window in building energy saving under various climates

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  • Lyu, Yuan-Li
  • Liu, Wen-Jie
  • Su, Hua
  • Wu, Xuan

Abstract

A novel triple glazing vacuum-water flow window combining the advantages of water medium window and vacuum glazing is proposed in the current study. Its thermal performance as compared to double glazing water flow window was analyzed numerically under various climates. The application of an evacuated gap is proven quite effective in reducing heat flow through the window. In typical cities with cold, hot summer cold winter, and hot summer warm winter climates, room heat gains through the window can be reduced by 43%, 44% and 42% during cooling operation. The contribution is more significant under stronger solar radiation condition. In heating operation, warm water supply is beneficial in reducing room heat loss through the window. Heat loss to ambient from the warm water layer is lessened and heat transfer inward to room space can be enhanced with thermal insulation of the evacuated gap. The benefit of active heating with warm water and evacuated gap insulation is more significant in climate with lower ambient temperature and larger heating demand. Stabilizing the inner glazing temperature and improving the indoor thermal comfort level is another advantage of the evacuated gap insulation.

Suggested Citation

  • Lyu, Yuan-Li & Liu, Wen-Jie & Su, Hua & Wu, Xuan, 2019. "Numerical analysis on the advantages of evacuated gap insulation of vacuum-water flow window in building energy saving under various climates," Energy, Elsevier, vol. 175(C), pages 353-364.
    • Handle: RePEc:eee:energy:v:175:y:2019:i:c:p:353-364
    DOI: 10.1016/j.energy.2019.03.101
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    References listed on IDEAS

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    Cited by:

    1. Chan, Lok Shun, 2023. "Numerical study on the thermal performance of water flow window fed with air-conditioning condensate," Energy, Elsevier, vol. 263(PB).
    2. Michał Musiał & Lech Lichołai & Dušan Katunský, 2023. "Modern Thermal Energy Storage Systems Dedicated to Autonomous Buildings," Energies, MDPI, vol. 16(11), pages 1-28, May.
    3. Zhou, Yuekuan & Zheng, Siqian, 2020. "Climate adaptive optimal design of an aerogel glazing system with the integration of a heuristic teaching-learning-based algorithm in machine learning-based optimization," Renewable Energy, Elsevier, vol. 153(C), pages 375-391.
    4. Li, Chunying & Tang, Haida, 2020. "Evaluation on year-round performance of double-circulation water-flow window," Renewable Energy, Elsevier, vol. 150(C), pages 176-190.
    5. Yamaç, Halil İbrahim & Koca, Ahmet, 2023. "Performance analysis of triple glazing water flow window systems during winter season," Energy, Elsevier, vol. 282(C).
    6. Guo, Wenwen & Kong, Li & Chow, Tintai & Li, Chunying & Zhu, Qunzhi & Qiu, Zhongzhu & Li, Lin & Wang, Yalin & Riffat, Saffa B., 2020. "Energy performance of photovoltaic (PV) windows under typical climates of China in terms of transmittance and orientation," Energy, Elsevier, vol. 213(C).

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