摘要
相变蓄热墙体能够有效降低室外温度波动对内墙面温度的干扰,提升室内热环境的稳定性并降低建筑能耗.由于冬夏季气象条件的差异,相变材料(phase change material,PCM)熔点的选择成为影响墙体热工性能的重要因素.为了实现蓄热墙体冬夏两季的高效利用,该研究构建了新型承载蓄热超结构墙体数值模型,对墙体力学性能进行检验,并模拟了冬季典型日和夏季典型日空气对流换热下墙体传热特性.结果表明,新型承载蓄热超结构墙体的力学性能满足工程应用需求,同时相较普通墙体具有良好的传热特性.其中,熔点为20℃的墙体在冬季热工性能最好,峰值相变率达到0.30,且内壁面最大温度波动为5.8℃,在夏季工况中,熔点为30℃的墙体具有较高的相变利用率为0.48,熔点为24℃的墙体内壁面温度波动最小.最后,综合考虑相变利用率和衰减倍数,获得了夏热冬冷地区最佳相变墙体熔点为24℃.
A phase change material(PCM)heat-storing wall can effectively mitigate the impact of outdoor tem-perature fluctuations on internal wall surface temperatures,enhance the stability of the indoor thermal environ-ment,and reduce building energy consumption.The selection of the PCM melting point is crucial due to the dif-fering weather conditions in the winter and the summer.To optimize the performances of heat-storing walls for both seasons in hot summer-cold winter regions,a numerical model for a novel load-bearing and heat-storing metastructure wall incorporating multi-melting point PCMs was developed.This model was used to evaluate the mechanical properties and simulate the heat transfer characteristics of the wall under air convection heat trans-fer conditions on representative winter and summer days.The results demonstrate that,the mechanical proper-ties of the phase change thermal storing wall meet the engineering application requirements,and its heat trans-fer characteristics surpass those of ordinary walls.Specifically,the wall with a PCM melting point of 20℃ex-hibits superior thermal performance in the winter,with a peak phase transformation rate of 0.30℃and a maxi-mum inner wall temperature fluctuation of 5.8℃.In the summer,the wall with a PCM melting point of 30℃shows a higher phase transformation utilization rate of 0.48,while the wall with a melting point of 24℃experi-ences the lowest temperature fluctuation.Therefore,with both the utilization ratio and the attenuation ratio considered,the optimal melting point for a phase change wall would be 24℃.
作者
姚翔宇
马建斌
王飞娅
杨肖虎
YAO Xiangyu;MA Jianbin;WANG Feiya;YANG Xiaohu(School of Architectural Engineering,Chongqing Water Resources and Electric Engineering College,Chongqing 402160,P.R.China;School of Human Settlements and Civil Engineering,Xi’an Jiaotong University,Xi’an 710049,P.R.China)
出处
《应用数学和力学》
CSCD
北大核心
2024年第8期1047-1057,共11页
Applied Mathematics and Mechanics
基金
重庆市教委科学技术研究项目(KJQN202303805,KJQN202103810)。
关键词
承载蓄热墙体
相变材料
力学性能
温控效能
数值模拟
load-bearing and heat-storing wall
phase change material
mechanical property
temperature control efficiency
numerical simulation