Study of Thermal Conductivity Measurement Method of Thin Insulation Material

Abstract

Aerogel composite insulation sheets which are complexed with fibers such as nonwoven and aerogel have been launched. For these materials, method of measuring the thermal conductivity has not been established because of their thin and high heat insulating property. In the present study, a method for measuring the thermal conductivity of above materials was proposed by combining a standard measurement method of heat-insulating material ‘Heat flow meter method’ and a mathematical formula for calculating the properties of composite materials ‘Rule of mixture’. By this approach, it was confirmed that it is possible to measure the thermal conductivity of ±2.1% precision fit the specifications of the measuring instrument.