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Difference between ashrae appendix-g 2013 or 2022 baseline.

asked 2023-07-10 01:21:20 -0500

killposition's avatar

My boss just assigned me to model a 4-story residential building in zone 4c, complying to Ashrae 2013 and 2022 separately. I just can't figure out any major difference between these two versions. Some differences in envelope but minor. Please help me out here. give me some pointers regarding the major difference that affect the simulation outcomes of the 2013 and 2022 baseline.

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answered 2023-07-14 06:19:39 -0500

@killposition: "Some differences in envelope but minor". From a modelling workload perspective, I wouldn't qualify these differences as minor. One significant change is the mandatory treatment of major thermal bridging in 90.1 2022 (e.g. slab intersections, balconies, fenestration perimeters), discussed halfway in this IBPSA-USA video. This may have slightly changed since the publication of Addendum av in 2022 (see p.14 for AppG requirements), but in a nutshell: AppG budget building models don't require major thermal bridging calculations (so that's easy), but proposed building models do. Requirements are somewhat different for ECB. In either case, there can be plenty of tedious (and error-prone) take-offs and pre-simulation accounting to do (depends on facade geometry). We put forth an OpenStudio measure to automate much of this. This should work just fine for AppG with OpenStudio models, EnergyPlus IDF files, and for any other package that can export to IFC or GBXML.

Of course this is a partial answer. Others may chime in on other 2013-vs-2022 differences.

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Asked: 2023-07-10 01:21:20 -0500

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Last updated: Jul 14 '23