SEDL / STP / STP1320-EB / STP12297S

Measuring and Calculating the Thermal and Hygric Properties of Insulating Building Materials Over Wide Temperature and Moisture Ranges

Černý, R
Associate ProfessorsFaculty of Civil Engineering, Czech Technical University, Prague,

Toman, J
Associate ProfessorsFaculty of Civil Engineering, Czech Technical University, Prague,

Pages: 12    Published: Jan 1997

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Abstract

Experimental and mathematical techniques for determining the thermal and hygric properties of insulating building materials in the temperature range of 0°C to 1000°C and moisture range from zero moisture content to the maximum water saturation are analyzed in the paper. Nona diabatic methods are preferred in measuring the specific heat. The methods based on the analysis of measured temperature and moisture fields are recommended for determining thermal conductivity, thermal diffusivity and moisture diffusivity. In measuring water vapor diffusion, transient methods are preferred. Thermal and moisture expansion are treated using the superposition principle. The application of the proposed methods is illustrated by experiments with two typical insulating building materials, the significance of temperature and moisture influences for the mentioned thermal and hygric parameters is demonstrated.