端木琳

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:女

毕业院校:大连理工大学

学位:博士

所在单位:土木工程系

学科:供热、供燃气、通风及空调工程. 热能工程

办公地点:大连理工大学土木工程学院综合实验4号楼431室

电子邮箱:duanmu@dlut.edu.cn

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Research on U-tube heat exchanger with shape-stabilized phase change backfill material

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论文类型:会议论文

发表时间:2015-10-20

收录刊物:EI、CPCI-S

卷号:146

页面范围:639-646

关键字:tube heat exchanger; backfill material; shape-stabilized PCM

摘要:Fluent software was used to simulate the heat transfer performance of the U-tube heat exchangers with backfill materials of shape-stabilized phase change materials (PCMs) and crushed stone concrete in this paper. The shape-stabilized PCMs refer to a mixture of decanoic acid and lauric acid that the mass concentration of decanoic acid is 60% with10% silica and 6% expanded graphite. It makes the shape-stabilized PCM has the coefficient of thermal conductivity of 1.528 W/(m.K) and the latent heat of 109.2 kJ/kg. After the simulation of the time for 12 hours, the heat exchange for unit borehole depth of backfilling with shape-stabilized PCM is 1.23 times of the heat exchange for unit borehole depth of backfilling with crushed stone concrete. And the influence radius of backfill materials of shape-stabilized PCM is 0.9 times of the influence radius of backfill materials of crushed stone concrete. So under same area of buried pipes region the shape-stabilized PCM backfill can get heat exchange is 1.37 times of crushed stone concrete backfill. In addition, the heat conductivity coefficient of PCMs has great influence on heat pump coefficient. (C) 2016 The Authors. Published by Elsevier Ltd.