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An evaluation of the effect of high performance spacer bars on the thermal performance of a range of window systems.

Williams, R G; Ballard, G (2004) An evaluation of the effect of high performance spacer bars on the thermal performance of a range of window systems. NPL Report. DEPC-TH 001

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Abstract

In this project the U-value of seventy-eight window systems were calculated by the Centre for Window and Cladding Technology using the procedures specified in BS EN ISO 10077-1, BS EN ISO 10077-2 and BS EN 673 standards and the U-value of twelve of those window systems have been measured by the National Physical Laboratory using the procedures specified in BS EN ISO 12567-1. The window systems included five types of frame, three types of glazing unit and six types of spacer bar. The improvement to the overall U-value resulting from the use of the high performance spacer bars is reported and the linear thermal transmittance ( ) and frame U-value (Uf) values are also given. The measured values are shown to largely support the calculated U-values and some reasons for the observed differences are explored.

Item Type: Report/Guide (NPL Report)
NPL Report No.: DEPC-TH 001
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Last Modified: 02 Feb 2018 13:16
URI: http://eprintspublications.npl.co.uk/id/eprint/2964

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