THERMAL-BEHAVIOR OF POLYURETHANE FOAM INSULATION

被引：0

作者：

FRASER, HW ^{[1
]}

JOFRIET, JC ^{[1
]}

机构：

[1] UNIV GUELPH,SCH ENGN,GUELPH N1G 2W1,ONTARIO,CANADA

来源：

CANADIAN AGRICULTURAL ENGINEERING | 1993年 / 35卷 / 01期

关键词：

POLYURETHANE FOAM INSULATION; THERMAL CONDUCTIVITY; MOISTURE; VAPOR PRESSURE GRADIENT; FREEZE; THAW;

D O I：

暂无

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Polyurethane foam insulation (PUFI) sprayed on galvanized steel was subjected for 375 days to thermally induced vapour pressure gradients. The 'warm' side of the PUFI was exposed to a temperature of 25-degrees-C and 90% relative humidity, while the 'cold' steel side temperature was cycled from -8-degrees-C to 5-degrees-C every 6 hours to simulate freeze/thaw conditions. After 375 days of testing (800 kPa.d of vapour pressure days), the PUFI had absorbed 2.7% water by volume, increasing its overall thermal conductivity from about 24 mW.m-1.degrees-C-1 to 32 mW.m-1.degrees-C-1.This means a loss in thermal resistance of about 25%. An asphaltic type vapour barrier was very effective in preventing moisture migration into the PUFI and the embedded wood framing members. Alternative construction techniques require further investigation.

引用

页码：57 / 65

页数：9