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Erschienen in:
2020 | OriginalPaper | Buchkapitel
Thermal Model for Building External Wall under Low Atmospheric Pressure and High Solar Radiation Conditions in Plateau Area
verfasst von : Yin Zhang, Enshen Long, Jin Li, Fei Gao
Erschienen in: Proceedings of the 11th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC 2019)
Verlag: Springer Singapore
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Abstract
Conventional building heat transfer modelling approach is mainly for low-altitude places, which neglect the unique climatic features in plateau areas. The improved building thermal model of external wall in plateau area is established, with the consideration of low atmospheric pressure and high solar and long-wave radiations. The impact of low air density on heat convection coefficient is analysed. Hence, the correction factor is proposed to assess the radiation influence on building external walls. According to the theoretical modelling and analysis, the coefficients of convection drop by 25% and 33% for inside and outside wall surfaces, respectively, when the altitude rises from 0 m to 4500 m. Moreover, the equivalent temperature has close relationship with the wall-facing direction, as well as the absorption ratio of solar radiation. Heat transfer correction factor always declines with growing solar heat gains. The present study can provide guidance and reference for the design optimisation of plateau buildings.