2022.03.28
①A numerical calculation model of the real-time temperature field of the building exterior wall under the conditions of solar radiation and ambient temperature changes is established. Using this model, the temperature distribution of the wall at each moment and its variation law with time can be easily and quickly calculated. The establishment of this model lays the foundation for the calculation of the temperature stress of each functional layer of the external wall thermal insulation system.
②The temperature distribution of building exterior wall is obviously affected by solar radiation, and its influence degree is closely related to season and orientation. In summer, the peak temperature of the west wall surface is the highest, and the temperature fluctuation is large; in winter, the peak temperature of the south wall surface is the highest, and the temperature fluctuation is large; the average temperature of the north wall in all seasons is lower, and the temperature fluctuation is also small; the wall in spring and autumn The temperature is between winter and summer.
③ Regardless of the form of internal heat preservation or external heat preservation, or the form of aerated concrete self-insulation, or the form of rock wool sandwich heat preservation, the temperature change in the insulation layer is relatively severe, but the temperature change of the external insulation layer is larger. The temperature of the part outside the insulation layer changes greatly, and the temperature change of the part inside the insulation layer is small.
④ The annual temperature difference change of the inner insulation wall of the outer wall is 5 times that of the outer insulation wall of the outer wall, and the annual temperature difference of the outer leaf wall of the sandwich insulation structure is 8 times that of the inner leaf wall. The outside of the body is 8 times the annual temperature difference of the inside. Therefore, the methods of internal insulation, sandwich insulation and self-insulation will reduce the stability of the structural wall and shorten the life of the structural wall.
⑤ At present, the design life of concrete structures is about 70 years, and the protection of external insulation for concrete walls can make them more stable. In order to achieve the goal of century-old architectural design, the practice of external thermal insulation should be vigorously promoted.
⑥The method of external thermal insulation is conducive to the maintenance and repair of the plastering layer and its finishing layer. When there is a problem with the external thermal insulation surface layer or even the thermal insulation layer, the maintenance and renovation methods can be used to continue to play the energy-saving thermal insulation function and continue to protect the structural wall. .
⑦ The temperature of the external thermal insulation surface of the external wall changes strongly, and the ability of the plastering layer and the decorative layer to resist temperature deformation and fatigue temperature stress should have higher requirements.
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