由于板房围护结构低热惰性,室内热环境恶劣,严重影响居住者的人体健康;尤其当高太阳辐射时,室内空气和墙体内表面温度快速上升,降低板房辐射得热成为改善室内热环境一个重要途径.建立两个板房模型,其中一个板房复合回归反射材料,对比分析回归反射材料对室内热环境改善的影响.研究表明复合回归反射材料使得板房内气温降低超过7℃,板房内表面最高温度降低接近10℃,室内作用温度降低6~10℃,表明回归反射材料可以显著提高板房内部热环境.同时研究还表明板房顶部、南外墙和东外墙复合回归反射材料效果最显著.%Owing to the small thermal inertia of prefab houses, indoor thermal environment is poor and occupants are tormented. Especially under the high solar radiation, both indoor air temperature and inner surface temperature increase rapidly and thereby, decreasing radiation heat gain is necessary for refining indoor thermal performance in prefab houses. To reveal the thermal performance improvement of prefab houses by covering retro-reflective materials, two prefab house models, one of which is covered by retro-reflective materials, are built. Results show that the indoor air temperature of the prefab house by covering retro-reflectivity materials can reduce by more than 7℃, while the reduced value is close to 10℃ for the peak radiant temperature and 7℃ for indoor average radiant temperature. It shows retro-reflective materials have a significant effect on thermal performance improvement of prefab houses. And it is found that the top, south and east walls are the better choices.
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