[Bldg-sim] Thermal Bridging for LEED compliant energy models

[Francesco Passerini]

Hello, where could I find a copy of the “MH Building Envelope Thermal
Bridging Guide”, please?
I have never received comments related to thermal bridges (I modeled 7
buildings that were certified LEED).
Generally I model only the thermal bridges that are relative to a material
discontinuity (e.g. a pillar in the exterior wall).
Consider that in some cases the value of the thermal bridge could be
negative (generally if you consider the exterior dimensions of the
envelope).
With Regards
Francesco Passerini



> ---------- Messaggio inoltrato ----------
> From: Volkan Ozdemir <ozdvolkan at gmail.com>
> To: bldg-sim at lists.onebuilding.org
> Cc:
> Date: Tue, 1 Dec 2015 23:49:45 +0300
> Subject: [Bldg-sim] Thermal Bridging for LEED compliant energy models
> Hello,
>
>
> Could some of you more experienced folk help me understand thermal
> bridging modeling for LEED compliant energy simulation?
>
>
>
> I use “MH Building Envelope Thermal Bridging Guide” for modeling thermal
> bridges in proposed design. However, there are couple of points I`m not
> sure about. I use clear field values from Appendix A as Appendix A already
> accounts for thermal bridging present in clear field envelope assemblies.
>
>
>
> 1.       Should I include Floor Slab Linear transmittance values in my
> proposed model? Even if floor slab edge is fully insulated on exterior,
> there will be some thermal bridging effect due to shelf angle use. However,
> this seems unfair for the proposed design as baseline design doesn`t take
> into account floor slab edge thermal bridging effect.
>
> 2.       Similarly, baseline model doesn`t account for “Glazing
> Transition Linear Transmittance”, “Parapet Linear Transmittance”, and
> “Corner Linear Transmittance”. Do I have to model these 3 thermal bridging
> effects on my proposed model, it seems rather unfair compared to baseline
> model?
>
> 3.       Did you ever receive any comments from LEED reviewers about
> thermal bridging, could you share your correspondence?
>
>
>
> Already now thanks for help,
> --
> Volkan Ozdemir
>
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