Phase change material (PCM) can be used in building envelope for heat insulation and energy-saving. However. the energy-saving effect of the PCM wall system is limited in summer since the PCM storing heat in the daytime will become a secondary heat source and release heat into the room again at night. This paper proposed a novel pipe-encapsulated PCM wall system. https://jeepworldes.shop/product-category/sunshades-and-sun-tops/