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Study on thermal insulation characteristics and optimized design of pipe-embedded ventilation roof with outer-layer shape-stabilized PCM in different climate zones

Author

Listed:
  • Yu, Jinghua
  • Leng, Kangxin
  • Ye, Hong
  • Xu, Xinhua
  • Luo, Yongqiang
  • Wang, Jinbo
  • Yang, Xie
  • Yang, Qingchen
  • Gang, Wenjie

Abstract

Roof receives heat directly from the solar radiation and outdoor air, and the heat transfer of the roof is often greater than that of any external wall. The building roof is usually overheated in summer, causing a great increase in the air conditioning load and negative effects on indoor thermal comfort. Thus improving the thermal insulation performance of the roof is essential for reducing air conditioning energy consumption and improving indoor thermal comfort. In this paper, an innovative pipe-embedded ventilation roof with outer-layer shape-stabilized PCM (named VRSP for short) was proposed. The heat gain is stored in the PCM to migrate excessive heat during the day and released through air ventilation at night. A three-dimensional transient-state heat transfer model of the VRSP system was built by CFD. The effects of phase transition temperature range of PCM, thickness of PCM layer and airflow rate in the ventilation duct on the thermal performance of the structure in five representative climate regions of China were evaluated. Results show that the optimum phase transition temperature ranges of PCM in severe cold region, cold region, hot summer and cold winter region, hot summer and warm winter region and mild region are 31–33 °C, 34–36 °C, 36–38 °C, 34–36 °C and 29–31 °C, respectively. The optimum thicknesses of the PCM layer are 25–30 mm, 25–30 mm, 30–35 mm, 25–30 mm and 20–25 mm, respectively. The suitable airflow rates are 1.5–1.9 m/s, 1.6–2.0 m/s, 2.1–2.5 m/s, 1.9–2.3 m/s and 1.4–1.8 m/s, respectively. The conclusion provides valuable guides for the application of VRSP under various climate conditions.

Suggested Citation

  • Yu, Jinghua & Leng, Kangxin & Ye, Hong & Xu, Xinhua & Luo, Yongqiang & Wang, Jinbo & Yang, Xie & Yang, Qingchen & Gang, Wenjie, 2020. "Study on thermal insulation characteristics and optimized design of pipe-embedded ventilation roof with outer-layer shape-stabilized PCM in different climate zones," Renewable Energy, Elsevier, vol. 147(P1), pages 1609-1622.
  • Handle: RePEc:eee:renene:v:147:y:2020:i:p1:p:1609-1622
    DOI: 10.1016/j.renene.2019.09.115
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    1. María M. Villar-Ramos & Iván Hernández-Pérez & Karla M. Aguilar-Castro & Ivett Zavala-Guillén & Edgar V. Macias-Melo & Irving Hernández-López & Juan Serrano-Arellano, 2022. "A Review of Thermally Activated Building Systems (TABS) as an Alternative for Improving the Indoor Environment of Buildings," Energies, MDPI, vol. 15(17), pages 1-31, August.
    2. Piselli, Cristina & Prabhakar, Mohit & de Gracia, Alvaro & Saffari, Mohammad & Pisello, Anna Laura & Cabeza, Luisa F., 2020. "Optimal control of natural ventilation as passive cooling strategy for improving the energy performance of building envelope with PCM integration," Renewable Energy, Elsevier, vol. 162(C), pages 171-181.
    3. Yan, Tian & Zhou, Xuan & Xu, Xinhua & Yu, Jinghua & Li, Xianting, 2022. "Parametric analysis on performances of the pipe-encapsulated PCM (PenPCM) wall system coupled with gravity heat-pipe and nocturnal radiant cooler," Renewable Energy, Elsevier, vol. 196(C), pages 161-180.
    4. Cui, Wei & Si, Tianyu & Li, Xiangxuan & Li, Xinyi & Lu, Lin & Ma, Ting & Wang, Qiuwang, 2022. "Heat transfer enhancement of phase change materials embedded with metal foam for thermal energy storage: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 169(C).
    5. Jiang, Wei & Zhang, Kuan & Ma, Lingyong & Liu, Bo & Li, Qing & Li, Dong & Qi, Hanbing & Liu, Yang, 2022. "Energy-saving retrofits of prefabricated house roof in severe cold area," Energy, Elsevier, vol. 254(PC).

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