This study analyzed the building energy performance of apartment buildings using retrofit systems with phase change materials (PCMs). The apartment type, building orientation, and height are considered to evaluate the implementation of an innovative PCM system. The building models selected were a flat-type apartment and tower-type apartment. According to the results, building orientation, height floor, and climate factors have a complex correlation with each other. Depending on the solar characteristics, solar altitude, solar time, wind direction, and wind speed, the suitable Building orientation and height for energy reduction of buildings vary. Such parameters also affect to the suitable PCM application for energy savings. As a result, PCMs of 20 °C and 26 °C showed to be suitable for the flat-type apartments with a southward orientation a westward orientation, respectively. Tower-type apartment with eastward and southward orientation showed the highest energy saving with PCM of 24 °C; the units with westward and northward orientation showed the highest energy reduction at 23 °C. Since the PCM efficiency for the energy savings are different depending on building orientations, heights, and climate factors, such variables are necessary to consider for the PCM application to the apartment building.

这项研究使用相变材料（PCM）改造系统分析了公寓建筑的建筑能效。考虑公寓类型，建筑物方向和高度，以评估创新PCM系统的实施情况。选择的建筑模型是公寓式和塔式公寓。根据结果​​，建筑物的朝向，高度和气候因素之间具有复杂的相关性。根据太阳能的特性，太阳能高度，太阳能时间，风向和风速，用于建筑物节能的合适建筑物方向和高度会有所不同。这些参数也影响适合的PCM应用以节省能源。作为结果，20°C和26°C的PCM分别适用于南向西向的扁平型公寓。向东和向南的塔式公寓在PCM为24°C时显示出最高的节能效果。向西和向北定向的单元在23°C时显示出最高的能耗降低。由于用于节能的PCM效率根据建筑物的方向，高度和气候因素而有所不同，因此对于将PCM应用于公寓大楼，必须考虑这些变量。