复合相变蓄冷通风屋顶的主要参数优化研究  

Optimization analysis of dominant influential parameters of ventilation roof with phase change material in cold storage

作　　者：杨华[1] 李晓菲 孔祥飞[1] 陈万河 YANG Hua;LI Xiaofei;KONG Xiangfei;CHEN Wanhe(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401

出　　处：《河北工业大学学报》2022年第2期56-62,共7页Journal of Hebei University of Technology

基　　金：国家自然科学基金(51978231);河北省自然科学基金(E2020202196);河北省引进留学人员资助项目(C20190507)。

摘　　要：为了提高夏季室内热舒适度,降低供冷能耗,将相变材料与建筑围护结构相结合是有效手段之一。将相变材料的吸放热特性应用于建筑的屋顶,为利用自然对流散热,将相变屋顶加入通风层,再联合主动供冷为室内提供一定的冷量。利用显比热容法对屋顶进行数值模拟,从屋顶外侧和屋顶内侧相变材料的相变温度、通风层厚度及供冷水管间距4个方面对复合相变蓄冷通风屋顶进行优化分析。结果表明:当室外、室内侧相变材料相变温度分别为32℃、24℃,通风层厚度为20 cm,供冷水管间距为10 cm时效果最好,即可将室内峰值温度降低5℃左右,将室内温度波动控制在10℃以内。In order to improve indoor thermal comfort and reduce cooling energy consumption in summer, the combination of phase change materials with building envelopes is one of the effective means. In this study, the heat absorption and exothermic properties of phase change materials are applied to the roof of a building. In order to take advantage of natural convection heat dissipation, the phase change roof is added to the ventilation layer and then combined with active cooling to provide a certain amount of cooling to the interior. Numerical simulations of the roof were carried out by using the specific heat capacitance method to optimize the analysis of the composite phase change cooling and ventilation roof in terms of the phase change temperature of the outer and inner phase change materials, the thickness of the ventilation layer and the spacing of the cooling water supply pipes. The results show that when the phase change temperature of the phase change material is 32 ℃ and 24 ℃, the thickness of the ventilation layer is 20 cm and the distance between the cold water supply pipes is 10 cm. In other words, the best effect can be achieved when the peak indoor temperature is reduced by about 5 ℃ and the indoor temperature fluctuation is controlled within 10 ℃.

关 键 词：相变材料 蓄冷技术 夜间通风 数值模拟 显比热容法 

分 类 号：TB61[一般工业技术—制冷工程]