Energy characteristics

 The energy balance point of view

Nowadays more and more organizations test the buildings’ energy performance. They calculate the conductivity (K), the thermal resistance (R) of different types of insulation with standard laboratory methods. Their measures allow to calculate the resistance when a heat flux goes through the body in defined conditions (temperature : 20°C, Humidity : 0%). However if we take the rock wool example, this one obtains according to the conductivity study a K= 0,045 w/m²°K as well as a value of R=2.35 (100 mm thickness). Nevertheless this calculation doesn’t take into account a recurrent problem in many old houses. Indeed if humidity increases by 50%, the rock wool is going to absorb this humidity and the conductivity coefficient is going to deteriorate according to the following parameters.

 

K is a dimension coefficient

 

λ0 is the thermal conductivity of dry material

 

H is the humidity relating to percentage

 

e represents the exponential function

 

λ=k.λ0.e0,08H

 

For the TC Ceramic, the thermal conductivity coefficient is 0,07 W/m²°K, which is a good coefficient, much superior than other classical insulations. However this one is not influenced by the humidity. It stays constant and enables an independent insulation of the meteorological conditions or leakages in the installation.

 

Besides basing on the conductivity coefficients at defined conditions, the PEB office disregards partly the phenomena linked to the radiation and to the emissivity of rays. A phenomena yet known for a while. The ceramic paints have been developed by the NASA for the insulation of their space shuttles. The relation bellow shows us the importance of the ray power (P) compared with the temperature C°.

 

     P=ε.σ.S.T4

 

σ  :  Stefan-Boltzmann’s constant (5,6703 . 10-8 W.m-2.K-4) ;

 

ε : emissivity, index of the value of 1 for a black body, which is included between 0 and 1 according to the material surface condition.

 

S : body surface.

 

T : body temperature (in Kelvin)


The TC Ceramic principle is to reflect the energy rays issued by any kind of bodies. Indeed, TC Ceramic is composed of

 

an acrylic base mixed with ceramic fragments and hollow glass balls allowing to reflect the 3 energy rays mainly responsible for the heat loss. It is proved by the research centre that the TC Ceramic enables to reflect 82% of UV, IR, and visible rays.

The energy of these rays is conserved, only 4% of the energy is absorbed. The coating enables to ameliorate the thermal insulation of the surface and to reduce the loss.
   

Scientific study on the topic : 

 
   

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