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SM&T Project 3032 - Contract MATI-CT 940063. Final summary report - Design and validation of glazed calibration panels required for the measurement of thermal transmittance of glazed assemblies.

Williams, R G; Hall, D A (1997) SM&T Project 3032 - Contract MATI-CT 940063. Final summary report - Design and validation of glazed calibration panels required for the measurement of thermal transmittance of glazed assemblies. NPL Report. CBTM 2

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Abstract

Draft CEN (and ISO) standards for hot-box U-value measurements of windows and insulated glazing units, require calibration measurements to be carried out with glazed calibration-panels of known thermal conductance. In this report a suitable design and construction procedure for these panels has been specified. This panel design has been validated by five partner laboratories (NPL, BBRI, EMPA, IFT and TNO) who each made panels to this specification and carried out the calibration procedures, specified in prEN 12412-1. The panels were then circulated to the other partner laboratories who measured their U-value using the CEN procedure. This report shows that the panel design selected produced panels that were robust and that the thermal conductances could be calculated to an estimated uncertainty of ± 6%. The work also demonstrated that the uncertainty of the subsequent U-value measurements made using the calibration data, were within ± 7%. The sensitivity of the CEN measurement procedures to the calculated conductance and temperature measurement accuracy is discussed and some improvements are suggested for the draft standards.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CBTM 2
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Last Modified: 02 Feb 2018 13:18
URI: http://eprintspublications.npl.co.uk/id/eprint/704

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