摘要
开孔聚氨酯是真空绝热板普遍采用的一种芯层材料。本文建立了开孔聚氨酯泡沫多孔介质材料的简化单元体模型,描述其微尺度空间结构,并导出了气相和固相热传导计算公式、热辐射等效导热系数计算公式、材料总有效导热系数计算公式。计算可得开孔聚氨酯泡沫的导热系数与固体基质导热系数、厚度、泡孔内稀薄气体气压值等因素有关。实验测量了开孔聚氨酯泡沫真空绝热板的导热系数,模型计算值与实验测量值比较具有良好的一致性,文章对保温绝热材料的研制和绝热性能的提高具有实用价值。
The open-cell polyurethane foam is a widely used core material for vacuum insulated panels(VIPs).By establishing the simplified model of open-cell polyurethane foam,the geometric structure inside the foam wasillustrated and the mathematic formulas for the equivalent thermal conductivity combined with gas phase andsolid phase,for heat radiation equivalent thermal conductivity and for the total thermal conductivity.Thecalculation results showed that thermal conductivity of open-cell polyurethane foam was related to the thermalconductivity of core material,thickness,and the pressure in VIPs.The calculated results had good agreement withthe experimental data.The research result is of great use for the thermal insulation material development and theadiabatic performance improvement.
作者
张婷婷
阚安康
曹丹
范薇
王亚薇
ZHANG Tingting;KAN Ankang;CAO Dan;FAN Wei;WANG Yawei(Chinese Association of Refrigeration,Beijing 100142,China;Merchant Marine College,Shanghai Maritime University,Shanghai 201306,China)
出处
《制冷技术》
2017年第3期29-33,共5页
Chinese Journal of Refrigeration Technology
基金
上海市自然基金资助项目(No.15ZR1419900)
关键词
开孔聚氨酯泡沫
多孔介质
导热模型
等效导热系数
Open-cell polyurethane foam
Porous media
Heat conduction model
Equivalent thermal conductivity
