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Until recently, the parallel approach to heat loss calculations was used. As with the slab penetration shown in Figure 2, the energy flow through the wall and slab were calculated based on the elevation area. The heat flows were added based on the ratio of wall to slab area. Any lateral flow of energy was ignored.

The reality is energy moves in all directions and a cold uninsulated slab will draw heat not only from the slab, but also from the interior air and wall assembly above and below (Figure 3). Therefore, the insulation in the wall is rendered less effective because heat flows around it and out the slab. The problem has been how to accurately calculate the energy end run.

In July 2011, engineering firm Morrison Hershfield Ltd. presented a paper to ASHRAE whatsapp number database showing how advanced computer modeling could accurately predict heat flow through thermal bridging. (The firm’s “Thermal Performance of Building Envelope Details for Mid- and High-Rise Buildings (1365-RP)” was presented to the American Society of Heating, Refrigeration, and Air-conditioning Engineers’ Technical Committee 4.4 on July 6, 2011). This research evaluated thermal performance data of 40 common building envelope details for mid- and high-rise construction. The modeling was validated by 29 guarded hot-box measurements. The intention was to modify the energy calculation methods described in ASHRAE.