How to match the aerogel felt with glass fibre needled felt best? Suppose we have a 350℃ high-temperature pipeline project that requires thermal insulation. The selected material is a combination of 10MM thick aerogel felt and 10MM thick glass fibre needled felt. Then there is a problem during installation. Should the aerogel felt be installed in the heat source at 350℃, or should the glass fibre needled felt be placed in the heat source first?
First of all, we start with the analysis of the temperature resistance and thermal conductivity of the two materials. Both materials can be used in an environment of 350°C. When the temperature of the aerogel felt is 350℃, the thermal conductivity is 0.03. The thermal conductivity of glass fibre needled manipulated at 350℃ is 0.063. From a theoretical analysis, the thermal conductivity of aerogel felt from room temperature 25 degrees to a high temperature of 350 degrees, and the graph is relatively flat.
In contrast, the thermal conductivity of glass fibre needle felt from room temperature 25 degrees to high temperature 350 degrees rises relatively large if we First use the aerogel felt with relatively low thermal conductivity and put it in the innermost part of the heat source for heat insulation. When the heat is transferred to the other side of the aerogel, felt, the temperature has dropped a lot, and then use the glass fibre needled felt. Thermal insulation should have the best effect.
Then, we use the heat preservation formula model for calculation and verification to see if our theory holds? First, we use 350℃ heat source + 10MM aerogel felt + 10 mm glass fibre needled felt to install and calculate. When the aerogel felt is at 281℃, the thermal conductivity is 0.028. Calculated by formula, in a high-temperature environment of 350℃, first use 10mm glass fibre needled felt, then superimpose with 10mm aerogel felt, the final surface temperature is 127℃.
The installation and matching sequence of the two materials is not the same, resulting in significant differences in heat preservation effect, surface temperature and energy-saving effect. In the same way, if several thermal insulation materials are designed for the thermal insulation project and the project, the installation with lower thermal conductivity must be placed in the heat source for insulation. Then other thermal insulation materials should be used to cover and install on it to keep it warm—the best insulation effect.