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

Nammi, Sathish K. and Shirvani, Hassan and Shirvani, Ayoub and Edwards, Gerard and Dunn, Jeremy (2014) Spreadsheet tools to estimate the thermal transmittance and thermal conductivities of gas spaces of an Insulated Glazing Unit. Technical Report. Anglia Ruskin University, Cambridge & Chelmsford, UK.

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Abstract

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.

Item Type: Research Report or Working Paper (Technical Report)
Additional Information: ISBN: 978-0-9565608-7-2
Faculty: Faculty of Science & Technology
Depositing User: Repository Admin
Date Deposited: 06 Mar 2014 09:24
Last Modified: 23 May 2019 08:48
URI: http://arro.anglia.ac.uk/id/eprint/313715

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