M00000217
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ISO 9869-1 1st Edition, August 1, 2014 Thermal insulation - Building elements - In-situ measurement of thermal resistance and thermal transmittance - Part 1: Heat flow meter method
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 9869 describes the heat flow meter method for
the measurement of the thermal transmission properties of plane
building components, primarily consisting of opaque layers
perpendicular to the heat flow and having no significant lateral
heat flow.
The properties which can be measured are:
a) the thermal resistance, R, and thermal conductance, A, from
surface to surface;
b) the total thermal resistance, RT, and transmittance from
environment to environment, U, if the environmental temperatures of
both environments are well defined.
The heat flow meter measurement method is also suitable for
components consisting of quasi homogeneous layers perpendicular to
the heat flow, provided that the dimensions of any inhomogeneity in
close proximity to the heat flow meter (HFM) is much smaller than
its lateral dimensions and are not thermal bridges which can be
detected by infrared thermography (see 6.1.1).
This part of ISO 9869 describes the apparatus to be used, the
calibration procedure for the apparatus, the installation and the
measurement procedures, the analysis of the data, including the
correction of systematic errors and the reporting format.
NOTE 1 It is not intended as a high precision method replacing
the laboratory instruments such as hot boxes that are specified in
ISO 8990:1994.
NOTE 2 For other components, an average thermal transmittance
may be obtained using a calorimeter or by averaging the results of
several heat flow meter measurements.
NOTE 3 In building with large heat capacities, the average
thermal transmittance of a component can be obtained by measurement
over an extended period, or the apparent transmittance of the part
can be estimated by a dynamic analysis of its thermal absorption
response (see Annex B).