[Bldg-sim] 90.1-2013 vs 2015 IECC Performance Path Compliance

[Elizabeth Gillmor via Bldg-sim]

I just did a little seminar on this very topic for our Rocky Mountain
ASHRAE tech conference last week.  There are a few other key differences in
90.1:

- Mandatory occupancy and daylighting controls in parking garages
- Bi-level occ sensors required in stairwells
- Slightly more stringent cooling efficiency requirements (full load and
part load, also slightly lower economizer thresholds). Differences in heat
pumps as well I believe.
- More stringent envelope requirements (walls and windows). Also note
limits to E/W glazing which may require that you rotate/average the
baseline.

Other important items to note:

- A90.1 has MANDATORY electrical submetering requirements (separate
monitoring for lighting, receptacles, and HVAC, plus some whole-building
requirements) -- this is a biggie. Read section 8-Power thoroughly!
- You CAN take credit for renewable energy (up to 5%)
- A90.1 does not have the same commissioning requirements
- A90.1 allows extra lighting credit for room geometry adjustments and some
extra lighting controls (see control factor table), whereas IECC does not


This is not a comprehensive list but those are the big ones that jump out.
Whichever method you choose, make sure you are using the space-by-space
method for lighting (it will almost always come out better than
whole-building).

Cheers,
Elizabeth


*Elizabeth Gillmor  PE, BEMP, LC, LEED AP*

*e n e r g e t i c s  **consulting engineers, llc*
energetics-eng.com | 303.619.0091

On Mon, May 2, 2016 at 11:08 AM, Duggin, Cory via Bldg-sim <
bldg-sim at lists.onebuilding.org> wrote:

> Does anyone have experience showing code compliance via the performance
> path in 90.1-2013 vs 2015 IECC?  I have a project that isn’t meeting the
> 15% threshold against the 2015 IECC standard reference design (per
> C401.2(3)).  I have always thought the 15% was to level the compliance
> paths, but the main difference I am finding between the 2015  IECC SRD and
> 90.1-2013 budget building is the mandatory plug load control requirement.
> What am I missing to account for the 15% difference?
>
>
>
> Thanks,
>
>
>
> *Cory Duggin, PE, LEED AP BD+C, BEMP*
>
> *Principal/Energy Modeling Wizard*
>
> *TLC Engineering for Architecture*
>
> 6 Cadillac Drive, Suite 200
>
> Brentwood, TN 37027-5080
>
>
>
> direct:
>
> 615-346-1939
>
> website:
>
> www.tlc-engineers.com
>
>
>
>
>
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