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山东挤塑板的绝热指数计算方式
作者:admin 来源:本站 发布时间:2016-07-07 15:39:31 浏览次数:393
d为材料的厚度,单位米,m
D is the thickness of the material, the unit meter, M
厚度越厚,保温效果越好。
The thickness is thicker, the insulation effect is better.
如:屋面挤塑板厚度为0.03m,钢筋砼屋面为0.15m。
Such as: the thickness of the roof extruded board is 0.03m, the roof of reinforced concrete 0.15m.
λ为材料的导热系数,单位W/M2.K
Coefficient of thermal conductivity of materials, unit W/M2.K
导热系数越低,保温效果越好。
The lower the coefficient of thermal conductivity, the better the thermal insulation effect.
如:屋面挤塑板导热系数为0.029W/M2.K,钢筋砼屋面为1.74W/M2.K

Such as: the roof board thermal conductivity is 0.029W/M2.K, the roof of reinforced concrete 1.74W/M2.K

山东挤塑板

R为热阻,单位m2.K/W,R=d/λ
R for thermal resistance, unit m2.K/W, R=d/
R值与厚度成正比,与导热系数成反比。R值越高,保温效果越好。
The R value is proportional to the thickness, and is inversely proportional to the thermal conductivity. The higher the R value, the better the thermal insulation effect.
如:3cm挤塑板R为1.034,15cm砼屋面为0.086
Such as: 3cm board R is 1.034, 15cm is 0.086 concrete roof
S为蓄热系数
S for heat storage coefficient
在周期性热作用下,物体表面温度升高或降低1℃时,在1h内,材料表面积贮存或释放的热量。通俗的讲就是材料储存热量的能力。
In the periodic heat, the surface temperature of the object is raised or lowered by 1 degrees Celsius. In the 1H, the surface area of the material is stored or released. Popular speaking is the ability to store heat.
如:挤塑板的S为0.54,砼屋面的S为17.2
Such as: plastic extruded board S is 0.54, S is 17.2 concrete roof
D为热惰性指标
D as thermal inertia index
D=RS,D值越大,温度波在其中衰减越快,围护结构的热稳定性越好。
D = D, the greater the value of RS, the faster the temperature wave attenuation, the better the thermal stability of the envelope.
如:挤塑板的D值为0.704,砼屋面D值为1.479
Such as: plastic extruded board D = 0.704, D = 1.479 concrete roof
计算屋面传热总热阻时R0时,除挤塑板和砼热阻1.034+0.086之外,还需要加上内部空气换热阻0.04,以及屋面外部空气换热阻0.11。所以该案例总热阻R0为
The calculation of the total thermal resistance of roofing heat transfer R0, in addition to the plastic extruded board and concrete resistance 1.034+0.086, also need to plus the air inside the change resistance 0.04, and the air outside the roof for thermal resistance of 0.11. So the total thermal resistance of the case is R0
1.034+0.086+0.04+0.11=1.54m2.K/W
1.034+0.086+0.04+0.11=1.54m2.K/W
传热系数K=1/R。
Heat transfer coefficient K=1/R.
该屋面传热系数K=1/1.54=0.649
The heat transfer coefficient of the roof K=1/1.54=0.649
低于该地区节能要求0.7W/M2.K
Below the area energy saving requirements 0.7W/M2.K
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