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本文首先阐述了利用拉氏变换确定多重相变温度和材料用量的原理,而后导出了利用反应系数法计算多重相变温度和材料用量的方法,最后以厦门普通屋面为例,分析说明了该理论与方法的具体应用。实例分析结果表明:内、外侧热作用引起的围护结构中的温度和热流变动可分解为单侧热作用引起的变动值的迭加;单侧热作用引起的围护结构中的温度和热流变动可用反应系数法来计算,温度反应系数和热流反应系数可分别由式(12)和式(13)计算确定;多重相变温度和材料用量可分别按式(14)和式(17)计算确定;当多重相变材料用于建筑外表面隔热时,相变温度可基于室外综合温度日平均值来确定;利用多重相变材料进行建筑隔热一般只需几毫米的相变层厚度。
In this paper, the principle of using Laplace transform to determine the multiple transformation temperature and the amount of material is first described. Then, the method of calculating the multiple transformation temperature and the amount of material using the reaction coefficient method is derived. Finally, the common roof in Xiamen is taken as an example to illustrate the theory And the specific application of the method. The case study shows that the variation of temperature and heat flow in the envelope caused by the thermal effect inside and outside can be decomposed into superposition of the variation caused by the unilateral thermal action. The temperature and heat flow in the envelope caused by the unilateral thermal action The variation can be calculated by the reaction coefficient method. The temperature response coefficient and the heat flux reaction coefficient can be calculated by the formulas (12) and (13) respectively. The multiple transformation temperature and the material dosage can be calculated according to (14) and (17) When the multiple phase change materials are used to insulate the exterior of buildings, the phase transition temperature can be determined based on the average outdoor temperature. For the thermal insulation with multiple phase change materials, the thickness of the phase change layer is usually only a few millimeters.