真空多层绝热的一个主要缺点是对夹层真空度要求较高。多层绝热要求夹层压强是粉末绝热的百分之一,这是由于多层绝热层间空隙较大所要求的(为了获得小的导热系数)。如果为了减小层间空隙而增加缠绕紧度,又会导致反射层和间隔物接触,增加了传热。这个问题可以在多层缠绕之间充填绝热粉末来解决。这种绝热,辐射热可被反射屏阻挡;由于粉末的存在,即使庄较低真空度下,气体的传热也大大减少。而通过绝热粉 A major drawback of vacuum multi-layer insulation is the high vacuum requirements on the interlayer. Multi-layer insulation requires that the interlayer pressure be one percent of the insulation of the powder, due to the large gap between the layers (in order to obtain a small thermal conductivity). Increasing the wrap tightness in order to reduce interstices in the void may in turn cause the reflective layer to contact the spacer, increasing the heat transfer. This problem can be solved by filling insulation between multiple layers of wound powder. This adiabatic, radiant heat can be blocked by the reflective screen; due to the presence of the powder, the heat transfer of the gas is greatly reduced even at a lower vacuum. And through the adiabatic powder