In recent years, the building sector has been responsible for continuous increase in energy consumption in the world. Space heating and cooling accounts for 34% of this energy consumption in buildings. In this context, using thermal energy storage (TES) can reduce energy consumption for space air conditioning. The use of phase change materials (PCM) as latent heat thermal energy storage (LHTES) system in the building envelope has been of great interest for passive cooling applications due to the high energy storage capacity of this technology. However, in order to utilize the full potential of a PCM, it needs to be fully charged at each cycle. Ventilation during the night is an effective method which can be used in PCM-enhanced office buildings with the aim of charging the PCM every required cycle. In the present study, PCM melting temperature of office building in various climate conditions was optimized using a simulation-based optimization and coupled with free cooling operation. Ventilation control strategies were used to improve the cooling energy performance of the PCM enhanced building integrated into envelopes. It was found that charging PCM with night ventilation, especially when using some specific control strategies of natural ventilation operated by external windows opening results in considerable cooling energy savings. The study was conducted for 15 different cities around the world. It was found that, in hot arid conditions, PCM passive cooling system was ineffective. Although, the energy savings were improved by coupling PCM and natural ventilation in these climate conditions. But the benefits were more or less similar to using natural ventilation only. On the other hand, in temperate condition, the effectiveness of PCM was increased from 3.32% to 25.62% by coupling a PCM passive system with night ventilation. It was further improved to 40% when using PCM with temperature-controlled ventilation. Moreover, it can be said that smart control of ventilation can lead to considerable energy savings.

近年来，建筑行业一直是全球能源消耗持续增长的原因。空间供暖和制冷占建筑能耗的34％。在这种情况下，使用热能存储（TES）可以减少空间空调的能耗。由于该技术的高能量存储能力，在建筑物围护结构中将相变材料（PCM）用作潜热热能存储（LHTES）系统引起了被动冷却应用的极大兴趣。但是，为了利用PCM的全部潜力，需要在每个周期将其充满电。夜间通风是一种有效的方法，可用于PCM增强型办公楼中，目的是在每个所需的周期为PCM充电。在目前的研究中，使用基于仿真的优化并结合自然冷却操作，优化了各种气候条件下办公楼的PCM熔化温度。通风控制策略用于改善集成到信封中的PCM增强型建筑的冷却能性能。发现使用夜间通风给PCM充电，尤其是当使用通过外部窗户打开进行自然通风的某些特定控制策略时，可节省大量的冷却能源。该研究是针对全球15个不同的城市进行的。结果发现，在炎热干旱的条件下，PCM被动冷却系统无效。虽然，在这些气候条件下，通过将PCM与自然通风相结合，可以节省更多能源。但是其好处或多或少类似于仅使用自然通风。另一方面，在温带条件下，通过将PCM被动系统与夜间通风结合使用，PCM的效率从3.32％提高到25.62％。当使用带有温度控制通风的PCM时，它进一步提高到40％。此外，可以说对通风的智能控制可以节省大量能源。