THE THERMAL CONDUCTIVITY OF FLEXIBLE POLYURETHANE FOAMS AT LOW TEMPERATURE
The thermal transfer mechanism of flexible polyurethane (PU) foams at low temperature has been discussed.According to the structural model diagram of flexible PU foam, the criterion L of convection can be calculated when parameters and influences are considered at low temperature. The thermal conductivity of the flexible PU foam at low temperature can be calculated, too. In order to compare with the calculated thermal conductivity, the thermal conductivity of the flexible PU foam at low temperature has been tested by means of the double-sample of guarded hot-plate apparatus in steady thermal flow which is usually used to test the thermal conductivity of the rigid PU foam. Finally, the curve between temperature and thermal conductivity at low temperature has been obtained. Furthermore, according to the test, the factors (such as temperature, density, water absorption etc.) which may change or influence the thermal conductivity have been discussed.
Flexible polyurethane foams Thermal transfer mechanism Thermal conductivity at low temperature
Jianke ZHANG Yongfu JI Yi WANG
LanZhou Institute of Physics, P.O.Box 94 LanZhou 730000 P.R.CHINA
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21(万方平台首次上网日期,不代表论文的发表时间)