U-value is the same as the heat transfer coefficient and is a property that describes how well a material conducts heat. The lower the U-value, the better the material insulates. An older designation for U-value is K-value.
Um-value is an average of the U-value of an entire building.
Refers to the thickness of the material in the heat flow direction.
Shows how light or difficult the heat can be transported through the material.
Also referred to as heat conductivity and is defined as the heat flow passing through the material per unit time.
Is a measure of the amount of resistance for the heat to enter the material depending on the direction of heat flow.
| Ri | Ry | ||
| Wall | 0.13 | 0,04 | m2,˚C/W |
| Ceiling | 0.10 | 0,04 | m2,˚C/W |
| Floor | 0.17 | 0,04 | m2,˚C/W |
Refers to the area of the current surface of the building.
| U-value: |  |
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