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Spreadsheet tools to estimate the thermal transmittance and thermal conductivities of gas spaces of an Insulated Glazing Unit

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posted on 2023-07-26, 16:52 authored by Sathish K. Nammi, Hassan Shirvani, Ayoub Shirvani, Gerard Edwards, Jeremy Dunn
An Insulated Glazing unit (IGU) is constructed with two or more layers of glass panes sealed together by gas spaces in-between. IGUs are prevalent in windows, doors and rooflights, primarily due to their improved thermal resistance. Today, most IGUs are either two or three layered. Adding further layers of glass improves thermal insulation but with the penalty of increased cost and weight. Low emissivity (Low-e) film coatings, when deposited on the glass panes, reduce long-wavelength radiative heat losses. Furthermore, filling the gas spaces with the inert gases (e.g. Argon, Krypton, Xenon and SF6), further reduce conduction and natural convection across the gap. In summary, higher thermal insulation performance of an IGU can be achieved with gas fillings and Low-e coatings on glass. This report discusses spreadsheets that have been developed, capable of estimating the thermal transmittance values of IGU, as per BS EN 673. The spreadsheet tools also have the ability to estimate the thermal conductivity of the gas spaces between the panes of IGU.

History

Refereed

  • No

Publisher

Anglia Ruskin University

Place of publication

Cambridge & Chelmsford, UK

ISBN

9780956560872

File version

  • Published version

Language

  • eng

Report type

  • Technical Report

Legacy posted date

2014-03-06

Legacy creation date

2019-05-23

Legacy Faculty/School/Department

ARCHIVED Faculty of Science & Technology (until September 2018)

Note

ISBN: 978-0-9565608-7-2

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