To improve the energy performance of existing buildings, retrofits may improve the energy efficiency or decrease energy demand. Many studies have been conducted on passive retrofit systems using phase change materials (PCMs). In this study, the objective is to analyze the energy performance and thermal comfort of an educational building with a shading system in South Korea. When PCMs were applied to the shading system, the cooling energy consumption decreased by 44%, and the number of hours of thermal comfort improved by 34%. The melting temperature of the PCM did not play a significant role in reducing the building energy consumption when the PCM was applied to the shading system.

In the economic aspect, although the PCM shading application requires more additional investment, the simple payback period (SPP) of the PCM shading application is lower than the building without PCM. Therefore, the PCM shading application to A Hall is a successful retrofit that has more energy efficiency and thermal comfort, and has a lower SPP. However, the increase in heating energy consumption due to the shading application in winter could not be overcome. This implies that further research on the shading system in cold climates are required.

为了提高现有建筑物的能源性能，改造可以提高能源效率或减少能源需求。已经对使用相变材料（PCM）的无源改造系统进行了许多研究。在这项研究中，目的是分析韩国带有遮阳系统的教育建筑的能源性能和热舒适性。当将PCM用于遮阳系统时，冷却能耗降低了44％，热舒适小时数提高了34％。当将PCM用于遮阳系统时，PCM的熔化温度在降低建筑能耗方面没有起到重要作用。

在经济方面，尽管PCM遮阳应用需要更多的投资，但是PCM遮阳应用的简单投资回收期（SPP）低于没有PCM的建筑物。因此，将PCM遮阳应用到大厅是一项成功的改造，具有更高的能源效率和热舒适性，并且具有较低的SPP。然而，由于冬天在遮阳处的应用而导致的热能消耗的增加无法克服。这意味着需要对寒冷气候下的遮阳系统进行进一步的研究。