läpäisevyysarvot

Lämpöpassiivisuusarvot, often referred to as "läpäisevyysarvot" in Finnish, describe the thermal conductivity of materials. This property quantifies how effectively a material conducts heat. A low läpäisevyysarvo indicates that the material is a good insulator, meaning it resists the flow of heat. Conversely, a high läpäisevyysarvo signifies a material that readily transmits heat.

In construction and building science, läpäisevyysarvot are crucial for assessing a material's ability to prevent heat loss in winter and heat gain in summer. Materials with low läpäisevyysarvot, such as insulation foams, fiberglass, and mineral wool, are used to improve energy efficiency in buildings by minimizing the need for heating and cooling. The unit of thermal conductivity is typically Watts per meter-Kelvin (W/(m·K)). This value represents the amount of heat energy transferred through a unit area of material with a unit thickness, over a unit temperature difference. Understanding and comparing läpäisevyysarvot allows for the selection of appropriate materials to achieve desired thermal performance in various applications, from building envelopes to electronic components.