Reference number
ISO 16957:2016
International Standard
ISO 16957:2016
Measurement of apparent thermal conductivity of wet porous building materials by a periodic method
Edition 1
2016-06
Read sample
ISO 16957:2016
63332
Published (Edition 1, 2016)
This publication was last reviewed and confirmed in 2021. Therefore this version remains current.

ISO 16957:2016

ISO 16957:2016
63332
Language
Format
CHF 129
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Abstract

ISO 16957:2016 describes a method of measuring the thermal conductivity (diffusivity) of a wet porous building material and a method of evaluating the measurement uncertainty.

While ISO 10051 is the current International Standard, based on a steady-state method, ISO 16957:2016 proposes a method that makes use of a non-steady-state method which uses a small temperature change with a short period as an input. Along with the measurement, an evaluation of the measurement uncertainty is described, which makes possible a simple and practical measuring method.

ISO 16957:2016 intends to measure the apparent (effective) thermal conductivity, including latent heat transfer caused by vapour movement. The situation in which moisture and/or air movement occur due to convection or gravity is excluded. The application of ISO 16957:2016 to high moisture content is excluded so that the gravity effect can be neglected. ISO 16957:2016 can be applied to a porous material heavier than about 100 kg/m3, in which radiative heat transfer can be neglected.

It specifies the following:

a) a non-steady-state method of measuring thermal conductivity;

b) an approximation formula for the measurement uncertainty caused by moisture movement and nonuniform moisture distribution (and, thus, a determination of the measuring conditions that satisfy the upper limit of measurement uncertainty);

c) an estimate of the heat transfer caused by moisture (vapour) movement.

General information

  •  : Published
     : 2016-06
    : International Standard confirmed [90.93]
  •  : 1
     : 20
  • ISO/TC 163/SC 1
    27.220 
  • RSS updates

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