OPEN ACCESS
Buildings accounts for more than 25% of the total energy consumption of our society, calling for better building energy-saving measures to improve the insulation performance of building walls. This paper explores the thermodynamic parameters (e.g. temperature field and temperature stress) of building thermal insulation wall. Firstly, the variation law of the temperature field of the building wall was simulated under the condition of external insulation structure; on this basis, the external insulation structure was compared with the internal insulation structure in terms of temperature stress variation. The research conclusions are as follows: The insulation materials in the wall significantly reduced the energy exchange between the indoor and outdoor environments. Under intense solar radiation, the surface temperature of the external wall was mainly affected by solar radiation; under weak solar radiation, the surface temperature of the external wall was mainly affected by the ambient temperature. Owing to the insulation layer, the temperature on the inner surface of the wall changed far slower than the external wall temperature. The temperature varied insignificantly from the surface of the inner wall to the inner surface of insulation layer, but significantly within the insulation layer. In the external insulation wall, the outermost decorative surface and the crack-resistant mortar layer both had a small temperature difference between the inner surface and the outer surface, witnessed a negative correlation between the surface temperature and temperature stress, and suffered mainly from tensile stress. Under significant variation of the ambient temperature, the two layers are likely to crack under the huge stresses. In winter, the base layer of the external insulation structure mainly suffered from compressive stress, while that of the internal insulation structure from tensile stress. In general, the external insulation structure can better protect the structural layer of the wall than the internal insulation structure, and effectively suppress the escape of indoor energy. The research findings lay a theoretical basis for the engineering application of the building wall insulation technology (BWIT) and shed new light on the prevention of wall durability problems (e.g. cracking and breaking) caused by temperature stress changes.
thermal insulation building wall, thermodynamic analysis, temperature field, temperature stress, simulation
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