λ (W/mK) Thermal Conductivity Coefficient
The thermal conductivity value (λ) is the expression of how much a material transmits heat depending on its physical and chemical structure. It is a fixed value specific to each material. The thermal conductivity value is expressed in Watts (W) of the amount of energy required to maintain a temperature difference of 1 Kelvin on the inner and outer surfaces of a wall consisting of 1 m thick material with a surface area of 1 m2. The closer the thermal conductivity coefficient of an insulation material is to 0, the better thermal insulation it provides. In this respect, PUR/- PIR filled panels perform better than others. The thermal conductivity values and performances of different building materials are shown in the table below.
|Standard||Reinforced Concrete||Aerated Concrete
|- (None) * (Poor) *** (Medium) **** (Good) ***** (Cedil;Very Good)|
U (W/m2K) Thermal Transmission Value
It is the amount of energy (W) required to maintain a temperature difference of 1 Kelvin between two parallel surfaces of a wall with a surface area of 1 m2 with a certain thickness. The closer the U value is to 0, the better the thermal insulation of the material. Thermal permeability values are taken into account when determining the sandwich panel filling material thickness.
MEKPAN POLYURETHANE FILLED SANDWICH PANEL THERMAL TRANSMISSION VALUE
R (m2K/W) Thermal Resistance
Thermal Resistance (R) is the resistance of a building material to heat transfer. The larger the R value, the less heat transfer, the higher the insulation performance. Thickness comparisons of different building materials with the same thermal resistance are shown below.