常规相变墙体在空调制冷季的被动隔热效果非常有限。本课题提出一种自力式能量迁移的套管封装相变墙体系统实现主动高效隔热。套管封装相变墙体与屋面夜间辐射冷却器耦合在一起形成重力热管效应以实现相变材料白天蓄热夜间通过长波辐射冷却进行自力式排热。本课题基于相变过程状态分界线建立相变材料的可变热容热阻简化动态模型；建立基于频域热特性分析的墙体结构本体简化动态模型；建立辐射冷却器的换热模型与重力热管的换热模型，并通过相关温度节点与相变材料的可变热容热阻简化动态模型及墙体结构本体的简化动态模型进行耦合求解，获取在室外环境及夜间长波辐射作用下该自力式能量迁移的套管封装相变墙体系统的冷却排热特性；建立这种结构系统的热特性测试实验平台，通过实验验证这种结构系统的热特性理论分析方法及模型。基于上述基础研究，进而研究这种结构系统的节能潜力及其对室内热环境的影响、这种结构系统在不同气候地区的适应性及设计理论与方法。

The passive insulation effects of conventional PCM walls are very limited. This proposal proposes a pipe-encapsulated PCM wall system with self-activated energy transfer for highly effective insulation. The pipe-encapsulated PCM wall is coupled with a roof nocturnal cooling radiator, and then the system results in heat pipe effect which may realize the self-activated rejection of the stored heat in PCM in the daytime by the nocturnal cooling radiation. This proposal develops the simplified dynamic model of the pipe-encapsulated PCM with variable capacitance and resistance based on the variable phase change boundaries. A simplified dynamic model is developed for the wall structure body based on the analysis of its frequency thermal characteristics. The heat transfer models of the nocturnal cooling radiator and the gravity heat pipe are also developed. These models are coupled together through related temperature nodes, and the coupled model is solved for the heat rejection characteristics of the pipe-encapsulated PCM wall system given the boundary conditions of the ambient environment and the nocturnal radiation. The experimental test rig is established for the thermal characteristics testing of this system, and the test results are used for validating these simplified dynamic models as well as the coupled model. Based on these fundamental researches, the energy saving potential and the effect on the indoor thermal environment of this system are further studied. Its adaptability for various climates and the design method are also studied.