Technical Paper 9 Slim-profile double glazing - Historic Scotland

Historic Scotland Technical Paper 9
The views expressed in the research report(s), presented in this
Historic Scotland Technical Paper, are those of the researchers,
and do not necessarily represent those of Historic Scotland.
This paper is available as web publication
on the Historic Scotland website:
www.historic‐scotland.gov.uk/technicalpapers
This paper should be quoted as
‘Historic Scotland Technical Paper 9’.
We like to thank our project partners:
Definitions
Embodied energy is the energy that was used in the work to make a product. Embodied
energy is an accounting methodology which aims to find the sum total of the energy
necessary for an entire product lifecycle. This lifecycle includes raw material extraction,
transport, manufacture, assembly, installation, disassembly, deconstruction and/or
decomposition. However, within this report, a cradle to site analysis has been used
incorporating data relating only to raw material extraction and processing, and
manufacturing and transporting.
Inert gas is a non‐reactive gas. The cost of the gas and the cost of purifying the gas are
usually a consideration when deciding to use it. Examples for inert gases are nitrogen,
argon, krypton or xenon. The latter three gases are used as infill gases for the cavities of
double‐glazed units.
U‐value (or thermal transmittance co‐efficient) is a measure of how much heat will pass
through one square metre of a structure when the temperature on either side of the
structure differs by 1 degree Celsius. The lower the U‐value, the better is the thermal
performance of a structure. The U‐value is expressed in W/m 2 K.