View source for Heat loss due to linear thermal bridging

{{Short description|Used to calculate the energy performance of buildings}}
The '''heat loss due to linear thermal bridging''' (<math>H_{TB}</math>) is a [[physics|physical]] quantity used when calculating the energy performance of buildings.  It appears in both [[United Kingdom]]<ref name="JPATL">{{cite web|url=http://www.techlit.co.uk/JPA%20Designer%20manual%20v5.pdf |archive-url=https://web.archive.org/web/20071008231456/http://www.techlit.co.uk/JPA%20Designer%20manual%20v5.pdf |archive-date=2007-10-08 |title=User Manual, JPA Designer |access-date=2007-07-06 |website=techlit.co.uk|url-status=dead }}</ref> and [[Republic of Ireland|Irish]]<ref name="SEI">{{cite web|website=[[Sustainable Energy Ireland]] |access-date=2007-07-06 |year=2006 |title=Dwelling Energy Assessment Procedure |url=http://www.sei.ie/getFile.asp?FC_ID=1591&docID=188 |archive-url=https://web.archive.org/web/20070928200950/http://www.sei.ie/getFile.asp?FC_ID=1591&docID=188 |archive-date=2007-09-28 |url-status=dead }}</ref> methodologies.

==Calculation==

The calculation of the heat loss due to linear thermal bridging is relatively simple, given by the formula below:<ref name="SC">{{cite web |title=Steel Construction and Thermal Bridging |url=http://www.steelconstruction.org/steelconstruction/view?entityID=1675&jsp=nsc_source&sessionID=-1166914701324&entityName=magazinearticle |access-date=2007-07-06 |website=[[British Constructional Steelwork Association]]}} {{Dead link|date=October 2010|bot=H3llBot|fix-attempted=yes}}</ref>

:<math>H_{TB} = y \sum A_{exp}</math>

In the formula, <math>y = 0.08</math> if Accredited Construction details used, and <math>y = 0.15</math> otherwise, and <math>\sum A_{exp}</math> is the sum of all the exposed areas of the [[building envelope]],

==References==
{{Reflist}}

{{Energy in the United Kingdom|energyconserv}}

[[Category:Energy economics]]
[[Category:Thermodynamic properties]]


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