ISO 9869-1:2014
Thermal insulation - Building elements - In-situ measurement of thermal resistance and thermal transmittance - Part 1: Heat flow meter method

Standard No.

ISO 9869-1:2014

Release Date

2014

Published By

International Organization for Standardization (ISO)

Latest

ISO 9869-1:2014

Scope

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, Λ, 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).

ISO 9869-1:2014 Referenced Document

• ASTM C1046-95 Standard Practice for In-Situ Measurement of Heat Flux and Temperature on Building Envelope Components
• ISO 6781:1983 Thermal insulation; Qualitative detection of thermal irregularities in building envelopes; Infrared method
• ISO 6946:2007 Building components and building elements - Thermal resistance and thermal transmittance - Calculation method
• ISO 7345:1987 Thermal insulation; Physical quantities and definitions
• ISO 8301:1991 Thermal insulation; determination of steady-state thermal resistance and related properties; heat flow meter apparatus
• ISO 8302:1991 Thermal insulation; determination of steady-state thermal resistance and related properties; guarded hot plate apparatus
• ISO 8990:1994 Thermal insulation - Determination of steady-state thermal transmission properties - Calibrated and guarded hot box

ISO 9869-1:2014 history

• 2014 ISO 9869-1:2014 Thermal insulation - Building elements - In-situ measurement of thermal resistance and thermal transmittance - Part 1: Heat flow meter method