With the development of economic and energy, materials and energy level reached by leaps and bounds in recent years, it also has many kinds of materials, press materials are porous and heat reflection. Porous is the use effect of pores reach, such as foam, fiber. Reflecting the main itself has very high reflectivity, reflects heat such as gold, silver, and nickel. What are the main factors affecting insulation?
First, the material, due to the different thermal conductivity of the insulation is also different. Even if the same material if it has a different internal materials thermal conductivity does not vary.
Second, the temperature, the temperature has a direct impact on insulation materials, high temperature, material more thermal energy produces thermal conductivity is more obvious, of course, does not significantly mainly in low temperature high temperature.
Third, moisture, humidity ratio is mainly reflected in the porous structure, porosity and moisture more easily, when the material humidity, there will be water, water has the role of heat transfer, thermal conductivity increases, from this we can see that if you do not want to avoid damp.
Finally, pore, the size of the hole will also affect the thermal conductivity factor, hole, the greater coefficient of thermal conductivity increases, between holes and the holes to increase conductivity.
Finally, bulk density, density or specific gravity density, if you want to reduce the coefficient of thermal conductivity, there are two ways to increase stomatal density can be reduced.
In General, the materials it is important to select 1) insulation resistance 2), odor-free, to human skin and body without obstruction does not cause unnecessary allergic 3) environmental protection does not contain toxic substances. 4) and long service life.