The low heat transfer and high energy storage performance of phase change material (PCM) will improve the thermal performance of the PCM-glazed units. However, decreasing the heat transfer results in uneven thermal load on the surface of the PCM-glazed units, which is an important cause of thermal stress in such units, because the glass in glazed units is a fragile material, and then large thermal stress can result in cracks and possible fallout of the glazed units. To study the thermal stress distribution of PCM-glazed units, a method combined numerical simulation and experimental analysis was conducted. First, the heat transfer performance and thermal stress distribution of PCM-glazed units with PCM thicknesses between 3 and 11 mm were experimentally investigated. Results showed that the thermal performance of a glazed unit was improved by adding PCM, and the variation of thermal strain on its surface with a PCM-layer thickness of 7 mm was the smallest in five test facilities. Then, the thermal stress was numerically investigated regarding the PCM height and the aspect ratio of the PCM-glazed unit. The higher the PCM height, the greater the maximum strain. An aspect ratio of PCM-glazed units of 1.5 was recommended.

相变材料（PCM）的低热传递和高能量存储性能将改善PCM玻璃单元的热性能。但是，减少传热会导致PCM玻璃单元表面上的热负荷不均匀，这是此类单元中热应力的重要原因，因为玻璃单元中的玻璃是易碎的材料，因此较大的热应力会导致玻璃单元破裂并可能掉落。为了研究PCM玻璃单元的热应力分布，进行了数值模拟和实验分析相结合的方法。首先，对PCM厚度在3至11 mm之间的PCM玻璃单元的传热性能和热应力分布进行了实验研究。结果表明，通过添加PCM可以改善釉面单元的热性能，并且在5个测试设施中，PCM层厚度为7 mm时其表面的热应变变化最小。然后，关于PCM高度和PCM上釉单元的纵横比，对热应力进行了数值研究。PCM高度越高，最大应变越大。推荐PCM玻璃单元的长宽比为1.5。