CHARACTERIZATION OF THERMAL AND MOISTURE TRANSFER OF BIPV/T WALLS IN SEVERE COLD REGIONS

Yu Shui; Xu Yijia; Sun Shengkun; Cui Enning; Liu Yang

doi:10.19912/j.0254-0096.tynxb.2024-0768

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (9) : 501-509. DOI: 10.19912/j.0254-0096.tynxb.2024-0768

CHARACTERIZATION OF THERMAL AND MOISTURE TRANSFER OF BIPV/T WALLS IN SEVERE COLD REGIONS

Yu Shui, Xu Yijia, Sun Shengkun, Cui Enning, Liu Yang

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Abstract

As building integrated photovoltaic/thermal（BIPV/T）walls are structurally different from ordinary walls, which leads to changes in their thermal and moisture insulation performance, this study takes Shenyang, a cold region, as a case study. A two-dimensional numerical model of coupled heat and moisture transfer was established to study the internal transfer processes inside the BIPV/T walls under the winter conditions, and to experimentally validate the validity of the method. Comparing the BIPV/T wall with a conventional externally insulated wall, the results show that the time lag factor (τ=4-5 h) and attenuation factor (f=0.064) of the BIPV/T wall are superior to those of the ordinary wall (τ=2-4 h, f=0.151), indicating better thermal performance. It can significantly improve the thermal comfort of the indoor environment. The internal water content of BIPV/T wall is 6% lower than that of ordinary wall, and it can accelerate the decrease of water content in the wall, keeping the moisture content within BIPV/T walls low. The probability of producing freeze-thaw damage in BIPV/T walls is 61.56% lower than that of ordinary walls, which improves the durability of the building envelope. The air channels of the BIPV/T wall can play a role in cooling down the PV modules, whose photovoltaic conversion efficiency is consistently above 18%.

Key words

solarenergy system / numerical models / heat transfer / moisture transfer / freeze-thaw risk

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Yu Shui, Xu Yijia, Sun Shengkun, Cui Enning, Liu Yang. CHARACTERIZATION OF THERMAL AND MOISTURE TRANSFER OF BIPV/T WALLS IN SEVERE COLD REGIONS[J]. Acta Energiae Solaris Sinica. 2025, 46(9): 501-509 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0768

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