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style="font-family:SimSun;font-size:18px;line-height:2;">2.隔热材料cd不同Q导热系C同。隔热材料的物质构成不同Q其物理性能也就不同Q隔热机理存在区别,其导热性能或导热系C各有差异。即使对于同一物质构成的隔热材料,内部l构不同Q或生的控制工Z同,导热pL的差别有时也很大Q?/span><br /> <span style="font-family:SimSun;font-size:18px;line-height:2;">3湿度。材料吸湿受潮后Q导热系数就会增大。水的导热系Cؓ0.5W/(m·K),比空气的导热pL0.029W/(m·K)?0倍。而如果空隙中的水l成了冰Q冰的导热系数是2.33W/(m·K)。保温隔热材料的防渗水性能ؓ重要Q因此选择保温隔热材料Ӟ应尽量选择吸水率低的材料;</span><br /> <span style="font-family:SimSun;font-size:18px;line-height:2;">4.I隙特征。早I隙率相同的条g下,I隙寸大Q导热系数越大。相互连通型的空隙比闭型空隙的导热pL高,闭I隙率越高,导热pL低Q?/span><br /> <span style="font-family:SimSun;font-size:18px;line-height:2;">5.定w大小。容重是材料气孔率的直接反映Q由于气相的导热pL通常均小于固相导热系敎ͼ所以保温隔热材料往往都具有很高的气孔率,也即h较小的容重。一般情况下Q增大气孔率或减容重都导致导热系C降;</span><br /> <span style="font-family:SimSun;font-size:18px;line-height:2;">6.温度。材料的导热pL随温度的升高而增大,但温度在0~50℃时q不显著Q只有对处于高温和负温下的材料,才要考虑温度的媄响?/span><br /></p> <div class="tag">相关标签Q?a href='/key.aspx?k=xps%e6%8c%a4%e5%a1%91%e6%9d%bf'>xps挤塑?/a>,</div> <div class="tag"><div>上一?<a 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