Definition - What does K Value mean?
K Value is a steady state of the heat flow through a unit area of a homogeneous material induced by the unit temperature gradient. It can be determined by the flow of heat from a hotter surface to a colder surface. It is used to describe British thermal unit (BTU) per hour. The K Value is independent of the thickness of a substance. It is expressed as watts per meter-Kelvin. These values do not depend on whether the material is flame proof, combustible or flame resistant.
Petropedia explains K Value
The ability to measure heat conductivity of a homogeneous material is known as K Value. In this process, the heat is transferred from one square foot of a substance that can cause a change in the temperature by one degree Fahrenheit. If the K Value of any substance is low the substance will perform better as an insulator. Before calculating K Value, it is required to think in terms of BTU of heat flow per hour and per square foot area or per degree of temperature difference.