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An investigation of measurement procedures needed to determine thermal transmittance of deep structures using both horizontal and vertical heat flow.

Williams, R G; Ballard, G (2004) An investigation of measurement procedures needed to determine thermal transmittance of deep structures using both horizontal and vertical heat flow. NPL Report. DEPC-TH 002

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Abstract

This report contains the experimental results of measurements made in the NPL Rotatable Hot Box apparatus, to investigate measurement procedures that could be used to measure the U-value of test elements that project into the cold chamber, measured with both horizontal and vertically-upwards heat flow. The design and construction of the special surround panel built for these measurements is described and the details of the calibration measurements made following the procedures specified in EN ISO 12567-1 and prEN -ISO/DIS 12567-2 (the latter using both horizontal and vertically-upwards heat flow) are given. The detailed experimental results are then presented for measurements made on a “Ideal Skylight” made from expanded polystyrene and on a real skylight supplied by Xtralight. The results of the measurements made following the CEN methodology are compared with the results of measurements made using the straightforward methodology given in ISO 8990. The effect of air velocity and local heat transfer coefficients are highlighted. Some recommendations are given for changes to prEN/ISO-DIS 12567-2.

Item Type: Report/Guide (NPL Report)
NPL Report No.: DEPC-TH 002
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Last Modified: 02 Feb 2018 13:16
URI: http://eprintspublications.npl.co.uk/id/eprint/3036

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