石蠟基復(fù)合定形相變材料制備及其相變墻體的供冷特性

打開文本圖片集

中圖分類號：TU111.4 文獻(xiàn)標(biāo)志碼：A 文章編號：1671-8755（2025）02-0016-09

Preparation of Paraffin-based Composite Shape-stabilized Phase Change Materials and Cooling Features of Its Phase Change Walls

MA Xueqian，MA Li （School of Civil Engineering and Architecture，Southwest University of Science and Technology，Mianyang621o10，Sichuan，China）

Abstract：The paraffn/high-density polyethylene/expanded graphite composite shape-stabilized phase change materials with different ratios were prepared through melt blending method. The optimal material ratio was determined through leakage tests and thermophysical property tests.A numerical simulation method was employed to investigate the application performance of phase change wals incorporating this material under summer operating conditions，as well as the cooling characteristics of the phase change thermal energy storage unit. The test results indicate that the optimal composition of the composite shapestabilized phase change material is composite phase change paraffin （ 52# solid paraffin to liquid paraffin ratio of 5：5）and high-density polyethylene with a mass ratio of 8：2，followed by the addition of 3% mass fraction of expanded graphite.The phase change temperature of the phase change material with the optimal proportion is 26.2°C ，the thermal conductivity is O.476 4 W/（m·K），the mass loss rate is 1.86% ， and the latent heat of phase change is 87.36J/g . The simulation results show that adding this composite shape-stabilized phase change material to thebuilding wall can effctively mitigate the fluctuation of the indoor temperature and improve the indoor thermal comfort. The appropriate phase transition temperature of the phase change material under the cooling condition is 26°C . A relatively high thermal conductivity of the phase change material can reduce the temperature of the inner wall surface and increase the heat flux density of the wall. Increasing the latent heat of phase transition of the phase change material can reduce the temperature of the inner wall surface of the wall and the fluctuation of the heat flux density. The research results can provide data support for the preparation and application of the composite shapestabilized phase change material.

Keywords： Composite shape-stabilized phase change material； Leakage measurement； Phase changewall; Cooling features

能源是經(jīng)濟(jì)發(fā)展的重要保障。（剩余10767字）