Analysis of Thermal Bridges - Scottish Energy Systems Group ...
Analysis of Thermal Bridges - Scottish Energy Systems Group ...
Analysis of Thermal Bridges - Scottish Energy Systems Group ...
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<strong>Thermal</strong> Bridging<br />
Effect <strong>of</strong> <strong>Thermal</strong> Bridging on U value for a timber frame wall<br />
A thermal bridge (timber is created thickness/insulation when due thickness) to structural or<br />
geometrical interruptions to homogenous insulated<br />
0.75<br />
construction 0.7 elements a path is created that allows heat<br />
0.65<br />
flow in addition to the one dimensional heat loss through<br />
0.6<br />
the construction 0.55 elements<br />
89/25<br />
0.5<br />
89/50<br />
Disadvantage:<br />
0.45<br />
89/89<br />
Greater 0.4 heat loss through fabric<br />
119/119<br />
0.35<br />
140/140<br />
Localised cold spots on fabric elements<br />
0.3<br />
0.25<br />
Lower radiant temperature (lower thermal comfort)<br />
0.2<br />
0.15 Condensation risk (mould hazard, maintenance)<br />
0 5 10 15 20<br />
Importance: Proportion <strong>of</strong> heat loss through bridge<br />
Percentage <strong>of</strong> wall bridged<br />
increases as U values decrease<br />
U value<br />
<strong>Scottish</strong> <strong>Energy</strong> <strong>Systems</strong> <strong>Group</strong> samuel@esru.strath.ac.uk
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