کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10417452 902370 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of pressure holding time of extraction process on thermal conductivity of glassfiber VIPs
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
Effect of pressure holding time of extraction process on thermal conductivity of glassfiber VIPs
چکیده انگلیسی
Vacuum insulation panels (VIPs) are regarded as the most promising high-performance thermal insulation products on the market today. A high and stable vacuum state within VIP enclosure provides a durable service life for VIP. In this paper, multiple core material layers (CMLs) with thickness of 0.5 mm, 1 mm, 3 mm, and 7 mm were formed as the core of glassfiber VIPs. The microstructure of the core materials and thermal conductivity of as-prepared VIPs was investigated. The porosity of the core materials was about 90% while the mean pore diameter was about 10∼25 μm. At adopted pressure holding time of extraction process of 180 s, the initial total thermal conductivity of VIPs was lower than 4 mW/(m K) and slightly increased with total thickness of core material, but increased greatly with CMLs thickness. Mass transfer characteristics within core material during extraction process was analyzed based on the interlayer-microstructure model. Residual gases within VIPs were mainly extracted from the connected gas flow channel built by glass fibers. The optimum pressure holding time for VIPs with 0.5 mm-thickness, 1 mm-thickness, 3 mm-thickness, and 7 mm-thickness CMLs was 300 s, 240 s, 240 s, and 180 s, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Processing Technology - Volume 214, Issue 3, March 2014, Pages 539-543
نویسندگان
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