ISO 9869-2:2018/DAmd 1

Example of calculation of uncertainty analysis

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DRAFT AMENDMENT
ISO 9869-2:2018/DAM 1
ISO/TC 163/SC 1 Secretariat: DIN
Voting begins on: Voting terminates on:
2020-12-21 2021-03-15
Thermal insulation — Building elements — In-situ
measurement of thermal resistance and thermal
transmittance —
Part 2:
Infrared method for frame structure dwelling
AMENDMENT 1: Example of calculation of uncertainty analysis
AMENDEMENT 1
ICS: 91.120.10
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ISO 9869-2:2018/DAM 1:2020(E)
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ISO 9869-2:2018/DAM 1:2020(E)
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ISO 9869-2:2018/DAM 1:2020(E)
Foreword

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This document was prepared by Technical Committee ISO/TC 163, Thermal performance and energy use

in the built environment, Subcommittee SC 1, Test and measurement methods.
The main changes compared to the previous edition are as follows:
— Modification of Annex E

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© ISO 2020 – All rights reserved iii
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ISO 9869-2:2018/DAM 1:2020(E)
Thermal insulation — Building elements — In-situ
measurement of thermal resistance and thermal
transmittance —
Part 2:
Infrared method for frame structure dwelling
AMENDMENT 1: Example of calculation of uncertainty analysis
Page 27
Replace Annex E to the following annex:
© ISO 2020 – All rights reserved 1
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ISO 9869-2:2018/DAM 1:2020(E)
Annex E
(informative)
The calculation example of uncertainty analysis
NOTE This is a simplified uncertainty analysis example for illustrative purpose.
E.1 Listing of uncertainty factors
Table E.1 shows the listing of uncertainty factors.
Table E.1 — Uncertainty factors in measuring the thermal transmittance

Measurement of heat Difference temperature between Measurement IR camera whichever is

transfer coefficient the heat transfer coefficient sensor of surface specification greater of 2 %,

and environmental temperature temperature measurement
(ET sensor) value or +/- 2°C
Thermo-couple ±0,2°C
specification
Measurement of heat flow meter Measurement Data logger ±6 μV
output of the heat transfer of voltage specification
coefficient sensor

Heat flow rate Difference temperature between Measurement IR camera whichever is

the surface temperature of the heat of surface specification greater of 2 %,
transfer coefficient sensor and temperature measurement
environmental temperature value or +/- 2°C
(ET sensor)
Thermo-couple ±0,2°C
specification
Measurement of heat flow meter Measurement Data logger ±6 μV
output of the heat transfer of voltage specification
coefficient sensor
Measurement of surface Measurement IR camera ±2 % of meas-
temperature of the wall of surface specification urement val
...