Heat loss due to linear thermal bridging

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^[1] and Irish^[2] methodologies.

Calculation

The calculation of the heat loss due to linear thermal bridging is relatively simple, given by the formula below:^[3]

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

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

1. "User Manual, JPA Designer" (PDF). JPA Technical Literature. Archived from the original (PDF) on 2007-10-08. Retrieved 2007-07-06. External link in |work= (help)
2. "Dwelling Energy Assessment Procedure". Sustainable Energy Ireland. 2006. Archived from the original on 2007-09-28. Retrieved 2007-07-06.
3. "Steel Construction and Thermal Bridging". British Constructional Steelwork Association. Retrieved 2007-07-06.