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

Jones, Christopher Christopher.r.Jones at wspgroup.com
Wed Dec 2 11:27:11 PST 2015


https://www.bchydro.com/powersmart/business/programs/new-construction.html#thermal



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Christopher Jones, P.Eng.
Senior Engineer

WSP Canada Inc.
2300 Yonge Street, Suite 2300
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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Francesco Passerini
Sent: Wednesday, December 02, 2015 12:21 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Thermal Bridging for LEED compliant energy models

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<mailto:ozdvolkan at gmail.com>>
To: bldg-sim at lists.onebuilding.org<mailto: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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