Assessment on Thermal Storage Performance of Capsule-Type Composite Phase-Change Materials  

作　　者：MA Rui GUO Jiamin WANG Zilong WANG Feng 

机构地区：[1]College of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot,010051,China [2]Key Laboratory of Wind and Solar Energy Utilization Mechanism and Optimization in Inner Mongolia,Inner Mongolia University of Technology,Hohhot,010051,China

出　　处：《Journal of Thermal Science》2025年第2期448-464,共17页热科学学报(英文版)

基　　金：supported by the Inner Mongolia Autonomous Region Science and Technology Plan Project(Grant No.2021GG0253);Inner Mongolia Autonomous Region Natural Science Foundation(Grant No.2024MS05044);Young Scientific and Technological Talent(Grant No.NJYT24012);Inner Mongolia Autonomous Region Scientific Research Projects of Universities(Grant No.JY20220110);Autonomous Region Science and Technology Plan Project(Grant No.2021ZD0036)。

摘　　要：To address the intermittent challenges of new energy and waste heat recovery as well as counteract the issues of corrosion and overcooling in phase-change materials,this study develops and investigates a medium-temperature phase-change capsule(PCC)through experiments and numerical simulations.The thermal cycle stability testing of the developed PCC,subjected to 150 cycles to evaluate its performance,demonstrated that the capsule's surface remained intact with no signs of leakage.The enthalpy-porosity method combined with the volume-of-fluid method was used to establish a numerical model to simulate the phase-change process in capsules with two structures:one with a central cavity and the other with a top cavity.Results indicated that when using 304 stainless steel as the wall material for both structures,the PCC with the centrally located cavity melted28.3%faster than that with the cavity at the top.When using different materials as wall coverings,the melting rate of the PCC made of polytetrafluoroethylene(PTFE)was 22.1%slower than that of the capsule made of 304stainless steel.Conversely,the modified PTFE PCC melted 15.2%faster than the stainless steel-based PCC.Furthermore,when using PCCs having different diameters,the time differences for complete melting between the PTFE and stainless steel-based PCCs were 118 s and 66 s for the capsules having diameters of 24 mm and 16 mm,respectively,indicating that the time difference decreased with decreasing capsule diameter.

关 键 词：phase-change capsule MELTING SOLIDIFICATION cavity position 

分 类 号：TK11[动力工程及工程热物理—热能工程] TB34[一般工业技术—材料科学与工程]