lämmönsiirtoarvot

Lämpönsiirtoarvot, often translated as thermal transmittance or U-value, are a measure of how effectively a building component or material conducts heat. Specifically, it quantifies the rate of heat transfer through a unit area of a material or structure when there is a temperature difference of one degree across it. The standard unit for lämmönsiirtoarvot in the SI system is watts per square meter per Kelvin (W/(m²·K)).

A lower lämmönsiirtoarvo indicates better insulation, meaning less heat is lost from a building in cold weather and less heat enters in warm weather. Conversely, a higher lämmönsiirtoarvo signifies poorer insulation and greater heat transfer. These values are crucial in building design and construction to ensure energy efficiency and thermal comfort.

Lämmönsiirtoarvot are determined for various building elements, including walls, roofs, floors, and windows. They are influenced by the materials used, their thickness, and the way they are assembled. Building codes and regulations often specify maximum allowable lämmönsiirtoarvot for different components to meet energy performance standards. Accurate calculation and consideration of these values are essential for minimizing heating and cooling costs and reducing a building's environmental impact.