真空度对真空隔热油管隔热性能的影响

The Vacuum Degree Impact on the Insulation Properties of Insulated Tubing

在测试隔热油管视导热系数的实验模型基础上,建立了隔热层传热的数学模型;以常用的不同型号隔热油管为例,分析了真空度对隔热油管隔热性能的影响,得到以下结论:当隔热层内部压力在(0～20)Pa之间或者大于40Pa时,其视导热系数随着压力的增大而增大;当压力在(20～40)Pa之间时,其视导热系数随压力的增大存在波动性的减小,隔热层中气体压力在(30～40)Pa间,隔热油管视导热系数较小。

Based on the experimental model of testing apparent heat conductivity of insulated tubing,a heat conduction mathematical model of insulated layer is established; take the different types of commonly used insulated tubing as an example, the vacuum degree impact on the insulation properties of insulated tubing is analyzed. The following conclusions is gotten： when the internal pressure of insulated layer between in （0 - 20） Pa or more than 40 Pa, its apparent heat conductivity increases with the pressure increases; when the pressure between in （20 - 40） Pa, its parent heat conductivity increasing with insulating layer between in the （ 30 - 40） Pa, pressure existence of decreaseing volatility, when gas pressure in the the apparent heat conductivity of insulated tubing as a smaller.