I am evaluating a new 10-story hotel design that is proposing glass curtain walls and pre-tensioned concrete floors that project beyond the walls. On 3 sides the projections are minimal (6 inches). However, on one side, the projections extend about 3 ft.

For the small projections, I intent to use the following method recommended in the thread below. "In screen 4 of 25 of the DD shell wizard you can specify "Slab Penetrates Wall Plane" (check box)."

I am interested in any tips for modeling the thermal impacts of the larger projections. Thoughts? (I plan to use window shading for the light/shading impacts.)

I am hopeful that the analysis will help convince the design team to incorporate some insulation and thermal breaks!

Thanks in advance!
Kevin
Mon Dec 6 11:45:18 PST 2010
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In screen 4 of 25 of the DD shell wizard you can specify "Slab
Penetrates Wall Plane" (check box). If you do, eQUEST created a new
wall type of height equal to your slab thickness and composed of 1' of
concrete plus any slab edge insulation you specify on the same wiz
screen. That provides a parallel path for the heat transfer from the
balcony or slab edge. Not exactly 2D heat transfer modelling -- but at
least you aren't ignoring the effect of the slab edge or balcony.

Kevin Coleman, CEM, LEED AP