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 ( $H_{TB}$ ) is a physical quantity used when calculating the energy performance of buildings. It appears in both United Kingdom{{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 }} and Irish{{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 }} methodologies.

Calculation

The calculation of the heat loss due to linear thermal bridging is relatively simple, given by the formula below:{{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}}

: $H_{TB} = y \sum A_{exp}$

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

References

Category:Energy economics

Category:Thermodynamic properties