Thermal conductivity ('k value') is a property of a material that determines how much heat is conducted through it for a given temperature difference. It is measured in watt per meter kelvin [W/(m · K)] and given by the following formula

k = QL / AΔT

where

Q is the amount of heat transfer through the material in watt [W]
L is the thickness of the material [m]
A is the area of the specimen in square meters [m²]
ΔT is the differential temperature across the specimen in kelvin [K]

Accurate measurement of this property is essential for modelling and managing heat, whether the component of interest is called on to insulate, conduct, or simply withstand temperature changes.

The Instrumentation

The Materials and Engineering Research Institute is equipped with a Heat Flow Meter capable of measuring thermal conductivity of low to medium conductivity materials to ASTM C518, JIS A1412, ISO 8301 and DIN 12667.

For the testing of solids of non-standard shape, liquids, pastes and loose materials we also avail of a Transient Hot Bridge - Thermal Conductivity Meter, which complies with ASTM D 5930-01, ASTM C1113 and DIN EN 993-15.

Consultancy

This instrumentation plays an important role in many of our research and consultancy projects. Typical applications of the Heat Flow Meter for thermal conductivity measurements are:

• Building materials eg render/plaster, brick
• Ceramics and refractories
• Polymers
• Composites

To find out more services we can provide please submit your enquiry.

Who to contact

For more information about thermal conductivity please contact Prof. Fin O'Flaherty.