Experimental study of the thermal conductivity of polyurethane foams
Experimental study of the thermal conductivity of polyurethane foams
复制标题
聚氨酯泡沫导热系数的实验研究
DOI：
10.1016/j.applthermaleng.2016.12.057
复制
发表时间：
2017-03
影响因子：
6.4
通讯作者：
Tao Wen-Quan
中科院分区：
文献类型：
--
作者：
Zhang Hu;Fang Wen-Zhen;Li Yue-Ming;Tao Wen-Quan
聚氨酯泡沫塑料在节能领域应用广泛，导热性能是其最重要的性能之一。为揭示和优化PU泡沫塑料的隔热性能，采用瞬变平面源法测定了CP、CP+IP、CP+245fa和CP+245fa+LBA五种发泡剂在不同环境下形成的PU泡沫的导热系数。综合考察了温度、湿度、吸水率、高低温交替、高温长时间存放和大气气压等因素对PU型材导热系数的影响。讨论了温度对PU泡沫塑料导热系数的影响机理。采用傅里叶变换红外光谱仪测量了这五种样品的光谱消光系数。利用光谱消光系数，由Rosseland模型计算了辐射导热系数。然后对辐射换热对有效导热系数的贡献进行分解。五种泡沫塑料的导热系数随温度非单调增加。当储存在潮湿的空气中时，导热系数可以增加高达10-18%。在−40℃、20℃和70℃时，辐射导热系数对有效导热系数的贡献分别为3.6-4.1%、7.3-9.0%和9.1-11.8%。
Polyurethane foams are widely used in energy conservation field and thermal conductivity is one of the most important properties. To reveal and optimize the thermal insulation performance of PU foams, the thermal conductivity of five PU foam samples formed by blowing agents of CP, CP + IP, CP + 245fa and CP + 245fa + LBA are measured using transient plane source method under various environment. Influences of temperature, humidity, water uptake, alternate high and low temperature, long time storage at high temperature and gas pressure of the atmosphere on the thermal conductivity of PU forms are investigated comprehensively. The mechanism of temperature that affects the thermal conductivity of PU foams is discussed. Fourier transform infrared spectroscopy is adopted to measure the spectral extinction coefficients of these five samples. With the spectral extinction coefficient, the radiative thermal conductivity is calculated from Rosseland model. Then the contributions of radiative heat transfer to the effective thermal conductivity are decomposed. The thermal conductivity of five foams increases non-monotonically with temperature. When stored in moist air, thermal conductivity can increase as high as 10–18%. Radiative thermal conductivity contributes 3.6–4.1% at −40 °C, 7.3–9.0% at 20 °C and 9.1–11.8% at 70 °C to the effective thermal conductivity.
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DOI：
10.1016/j.icheatmasstransfer.2015.08.027
发表时间：
2015-11
影响因子：
7
作者：
Hu Zhang;Wen-Zhen Fang;Zengyao Li;W. Tao
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影响因子：
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DOI：
10.1016/j.jqsrt.2009.11.018
发表时间：
2010-04
影响因子：
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作者：
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