Polyurethane (PU) is an ideal thermal insulation material due to its excellent thermal properties. The incorporation of Phase Change Materials (PCMs) capsules into Polyurethane (PU) has been shown to be effective in building envelopes. This design can significantly increase the stability of the indoor thermal environment and reduce the fluctuation of indoor air temperature. We develop a multiscale model of a PU-PCM foam composite and study the thermal conductivity of this material. Later, the design of materials can be optimized by obtaining thermal conductivity. We conduct a case study based on the performance of this optimized material to fully consider the thermal comfort of the occupants of a building envelope with the application of PU-PCMs composites in a single room. At the same time, we also predict the energy consumption of this case. All the outcomes show that this design is promising, enabling the passive design of building energy and significantly improving occupants' comfort.

翻译：聚氨酯（PU）因其优异的热性能而成为理想的保温材料。研究表明，将相变材料（PCMs）胶囊掺入聚氨酯（PU）中可有效应用于建筑围护结构。这种设计能显著提高室内热环境的稳定性，并降低室内空气温度的波动幅度。我们建立了PU-PCM泡沫复合材料的多尺度模型，并研究了该材料的热导率，进而可通过热导率对材料设计进行优化。基于优化材料的性能开展案例研究，在单个房间中应用PU-PCMs复合材料，充分考虑建筑围护结构内居住者的热舒适性。同时，我们还预测了该案例的能耗。所有结果表明，该设计具有良好前景，可实现建筑能耗的被动式设计，并显著提升居住者舒适度。