摘要
建筑围护结构结合相变蓄热材料能够大幅提升其蓄热性能,削弱室外温度波动对室内热环境的不利影响,有助于充分利用自然气候资源。由于相变材料的变物性特征,相变墙体和传统围护结构的热工性能存在显著差异。基于人工控制环境下的缩尺模型实验,对比分析了在室内外双向周期性热作用下,相变墙体不同材料层顺序(相变蓄热层、保温层、结构层)对其热工性能的影响。结果表明,当墙体材料层顺序由外向内分别为"保温层-结构层-相变蓄热层"时,实验小室室内空气温度峰值最小。分析了在不同材料层顺序下相变墙体的内表面蓄热系数,结果表明当墙体的材料层顺序由外向内分别为"相变蓄热层-保温层-结构层"及"保温层-结构层-相变蓄热层"时,相变墙体的内表面蓄热系数分别为4.39 W/(m^2·K)和4.13 W/(m^2·K),均大于采用材料层顺序由外向内为"相变蓄热层-结构层-保温层"的相变墙体的内表面蓄热系数。内表面蓄热系数计算结果与相变墙体热工性能实验结果相符,能够准确体现相变墙体内表面蓄热性能及其对室内热环境的影响。
Building envelopes integrated with phase change materials(PCMs)could enhance thermal storage performance of building envelopes significantly.Due to the variable physical property of PCMs,the thermal performance of PCMs envelopes is different from traditional envelopes.The thermal performance of PCMs wallboard is experimentally investigated in an artificial climate chamber.In the experiments,the PCMs wallboard is under double-sides heat effect,including periodic outdoor air temperature fluctuation and intermittent internal heat action.The thermal performance of PCM wallboard with different material layer arrangement orders is compared.The coefficient of heat accumulation of interior surface is adopted to evaluate the wallboard thermal storage performance.The results show that,the thermal performance of the wallboard with insulation layer on exterior side and PCMs layer on interior side can achieve ideal thermal storage performance with the minimum indoor air peak temperature.The coefficients of heat accumulation of interior surface are 4.39 W/(m^2·K)/4.13 W/(m^2·K)of the material orders with PCM layer/concrete layer on the interior side.As a key parameter of thermal storage performance,the coefficient of heat accumulation of interior surface can provide reference for the thermal design of PCMs envelopes.
作者
乔宇豪
鲍嘉阳
刘衍
杨柳
QIAO Yu-hao;BAO Jia-yang;LIU Yan;YANG Liu(State Key Laboratory of Green Building in Western China,Xi’an University of Architecture and Technology,Xi’an 710055,China;College of Architecture,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《建筑节能》
CAS
2020年第6期1-5,共5页
BUILDING ENERGY EFFICIENCY
基金
“十三五”国家重点研发计划资助项目“建筑本体与建筑能耗耦合计算模型开发”(2017YFC0702201)
国家自然科学基金青年项目(51808429)
中国科协“青年人才托举工程”计划资助项目(2018QNRC001)
关键词
围护结构
相变蓄热材料
蓄热性能
内表面蓄热系数
缩尺模型实验
building envelopes
phase change materials(PCMs)
thermal storage performance
coefficient of heat accumulation of interior surface
reduced-scale experiment
