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快速测定多孔保温材料含水量的温度匹配法

Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2017-03-25

Journal: 建筑热能通风空调

Volume: 36

Issue: 3

Page Number: 1-4,16

ISSN: 1003-0344

Key Words: 含水量;快速测量;温度匹配;容积热容

Abstract: 基于瞬态热线原理,提出了一种快速测定多孔保温材料内含水量的方法.运用经典的复合导热理论,考虑发热体自身的半径及热物性参数,对实验测得的100 s内的瞬态温度数据进行匹配,得到被测多孔材料的容积热容值(即密度与比热容的乘积).根据吸湿之后材料的容积热容的变化值,即可求出多孔材料内水分的容积含量.两轮的重复测试结果显示,该方法获得的含水量与称重法获得的含水量差异较小,具有较好的工程实用前景.

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