Investigation on Mechanical Properties and Temperature Control Efficiency of Novel Load-Bearing and Heat-Storing Metastructure Walls in Hot Summer-Cold Winter Regions
Investigation on Mechanical Properties and Temperature Control Efficiency of Novel Load-Bearing and Heat-Storing Metastructure Walls in Hot Summer-Cold Winter Regions
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℃.
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
Key words
load-bearing and heat-storing wall/phase change material/mechanical property/temperature con-trol efficiency/numerical simulation
维普
万方数据