A heat flow meter apparatus is used to monitor the heat flux across a moist speci men of a low density glass-fibre insulation. The results indicate that moisture is transported through the specimen predominately by vapour diffusion. A thermo dynamic model is suggested to represent the transport process. This model leads to two moisture transport coefficients characteristic of the specimen.
Langlais, C. , M. Hyrien and S. Klarsfeld."Moisture Migration in Fibrous Insulating Materials Under the Influence of a Thermal Gradient and its Effect on Thermal Resistance,"Moisture Migration in Buildings, ASTM special technical publication 779, p. 191 (1982).
2.
ASTM standard test method C518 "Standard Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter."1981Annual book of ASTM standards, p 224.
3.
CRC Handbook of Chemistry and Physics 66th edition, pp D-171 and D-189 (1985)
4.
ASTM standard test method C355. "Standard Test Method for Water Vapor Transmission of Thick Materials"1981Annual book of ASTM standards, p 124.
