The Effect of Ventilation Control on Thermal Comfort in PCM-integrated Dwellings

This research explores the potential of combining phase change materials (PCMs) with ventilation control strategies to reduce overheating risks in newly constructed dwellings. In such buildings, adverse summer comfort condition can emerge due to the retention of heat within their highly-insulated andsealed envelopes. By passively integrating PCMs alongside night ventilation strategies, cool outdoor air can dissipate the heat energy stored in PCMs, facilitating their melting and solidification cycles and harvesting their full potential. In this study, a residential building integrated with PCMs is subjected to threedifferent ventilation strategies to evaluate the impact on PCM performance. Simulations were conducted for various cities to assess the climate dependency of the results. The findings demonstrate that PCM technology, when combined with appropriate ventilation strategies, effectively reduces overheating hours. In Brussels and Stockholm, PCM integration alone was sufficient to prevent overheating in the building. In contrast, in cities with higher outdoor temperatures, such as Madrid and Vienna, a proper ventilation strategy is necessary to mitigate the relatively high number of overheating hours. In these cities, overheating hours were reduced by 15.7% to 17.4%.本研究探索了将相变材料（Phase Change Materials，PCMs）与通风控制策略相结合，以降低新建住宅过热风险的潜力。此类建筑因采用高绝热且密闭的围护结构，易在夏季出现热舒适不佳的状况。通过被动集成相变材料与夜间通风策略，凉爽的室外空气可散去储存在相变材料中的热能，促进其熔化与凝固循环，从而充分发挥其性能潜力。本研究针对集成了相变材料的住宅建筑，采用三种不同的通风策略，以评估不同策略对相变材料性能的影响。研究针对多个城市开展了模拟仿真，以评估结果的气候依赖性。研究结果表明，将相变材料技术与适配的通风策略相结合，可有效减少建筑的过热时长。在布鲁塞尔与斯德哥尔摩，仅采用相变材料集成方案即可避免建筑出现过热问题。与之相对，在户外温度更高的马德里、维也纳等城市，则需采用合理的通风策略，以缓解过多的过热时长。在这些城市中，建筑过热时长可降低15.7%至17.4%。