Abstract
The glazed roof has better lighting performance and is widely used in modern building design. However, its poorer heat insulation performance can decrease indoor thermal comfort. Therefore, the interlayer of insulating glazed roof is injected with phase change material (PCM) to improve the indoor thermal environment of building and reduce the energy consumption, while obtain sufficient indoor light. Based on enthalpy method, a numerical heat transfer model of double-slope PCM glazed roof was established and verified in this paper. The heat transfer performance of double-slope hollow glazed roof and double-slope PCM glazed roof were compared. Finally, the design of double-slope PCM glazed roof in hot summer and cold winter area was optimized by further studying the roof angle, phase change layer thickness, glazing layer thickness, the melting temperature and phase change latent heat of PCM. The results show that the suitable melting temperature is 26–30 °C under the typical climate of hot summer and cold winter in Wuhan. Increasing the thickness of phase change layer and glazing layer can improve the thermal insulation performance of the roof, but the former effect is more significant. Moreover, a smaller roof angle within a certain range can reduce the amount of solar radiation received by the roof, and a larger latent heat energy of PCM can absorb more solar radiation to improve the heat transfer performance of the roof.
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