Latent heat storage of Phase Change Material (PCM) is beneficial for Thermal Energy Storage (TES) in solar energy systems. The Water Flow Window (WFW) is a concept that has emerged in the last decade. The circulation of water between glazing dissipates and stores solar-based energy. These two concepts can be brought together on the way of Nearly Zero Energy Buildings. In this study, the experimental investigation of the WFW system and numerical modeling of solar TES with PCM as a heat exchanger has been carried out. The experimental study is performed under environmental conditions like prototype testing. Two equivalent testing cabinets with WFW and standard (air-filled) window are employed to compare the electrical energy consumption of the cooling devices of testing cabinets. Two different PCM, filled in tubes as a pistol type, is mounted in a water tank. The TES tank volume is 5.675 liters (42% water, 46% RT28 HC, 12% RT35 HC). The windows' surface area is approximately 0.3 m². Results show that the consumption ratio of cooling devices can fall under 85% and 2916 kJ energy can be stored throughout 6 h. Visualization of the melting process in the TES tank is obtained with the numerical study.

相变材料 (PCM) 的潜热存储有利于太阳能系统中的热能存储 (TES)。水流窗口 (WFW) 是过去十年中出现的一个概念。玻璃之间的水循环消散并储存太阳能。这两个概念可以在近零能耗建筑的道路上结合在一起。在本研究中，对 WFW 系统进行了实验研究，并对以 PCM 作为热交换器的太阳能 TES 进行了数值建模。实验研究是在原型测试等环境条件下进行的。采用两个等效的带WFW和标准（充气）窗口的测试柜来比较测试柜冷却装置的电能消耗。两种不同的 PCM，填充在管中作为手枪型，安装在水箱中。TES 罐容积为 5.675 升（42% 水、46% RT28 HC、12% RT35 HC）。窗户的表面积约为 0.3 m² . 结果表明，冷却装置的消耗率可以降到 85% 以下，6 小时内可以储存 2916 kJ 的能量。通过数值研究获得了 TES 罐中熔化过程的可视化。