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What are heat transfer coefficient U, thermal resistance R and thermal conductivity λ?
The U-factor is the primary parameter for assessing the thermal insulation of a building. Determines the amount of heat that is able to pass through the partition. It is this coefficient that is used by the Technical Conditions, which imposed that from January 1 this year. U for walls can not be higher than 0.25 and for roofs 0.2 W/m2K.
The lower the U-factor, the warmer the partition.
The U-factor depends on thermal resistance and is calculated from the relationship:
U = 1/R
R – thermal resistance
The thermal resistance R depends on the type of material and its thickness. The higher the thermal resistance, the warmer the partition (it is a better insulator). Thermal resistance is calculated from the formula d/λ.
d – thickness of the partition (given in meters)
λ – coefficient. thermal conductivity
The thermal conductivity coefficient λ is a physical property of any material and does not depend on its thickness. The smaller the λ, the better insulator the material is.
λd – declared thermal conductivity coefficient. Is the value after laboratory tests with the aging process.
For newly built facilities, EuroPanels has a range of energy-saving panels with PUR and EPS core. A building properly designed and constructed with EuroPanels sandwich panels, can significantly reduce the cost of its subsequent maintenance. The lower the U-factor, the proportionally lower the heating costs.
As for existing facilities, EuroPanels has developed products specifically for thermal upgrades. By calculating the U-factor for an already existing building, it is possible to determine how much heat loss can be reduced by applying additional insulation to exterior walls and roofs. An additional benefit is the increased sound insulation of the building.
Keep in mind that heat loss through the exterior walls of, for example, a single-family home can be as high as 35%, and through the roof heat loss is estimated to be at least 25%. That’s why it’s so important to use modern and energy-efficient building materials, among which one of the most interesting offerings are sandwich panels for wall and roof structures and thermal insulation products from the EuroPanels collection.
