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Thermal Insulation in Sandwich Panels

Thermal Insulation in Sandwich Panels

Thermal Insulation in Sandwich Panels

Thermal Conductivity Coefficient λ (W/mK)
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 show better performance than the others. The thermal conductivity values and performances of different building materials are shown in the table below.

  Standard Reinforced Concrete Gas Concrete Wall Glasswool Stone Wool EPS PUR PIR
λ (W/mK) EN13162 2.2 0.16 0.45 0.040 0.040 0.038 0.022
U (W/m2K) 50mm 44 3.2 0.9 0.08 0.8 0.76 0.44
PERFORMANCE   - * *** *** **** ***** *****
 - (None) * (Poor) *** (Medium) **** (Good) ***** (Excellent)

Thermal Conductivity Value U (W/m2K) 

    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 and 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.

THERMAL CONDUCTIVITY VALUE OF MEKPAN POLYURETHANE FILLED SANDWICH PANEL

  40mm 50mm 60mm 80mm 100mm 120mm 150mm 200mm
U (W/m2K) 0.550 0.440 0.367 0.275 0,220 0.183 0.147 0.110

 

Thermal Resistance R (m2K/W) 
   
Thermal Resistance (R) is the ability of building material to resist heat flow. The greater the R-value, the less the heat flow, and the higher the insulation performance. Below are the thickness comparisons of different building materials with the same thermal resistance..