[Equest-users] Gas or Electric (System 5 or System 6)

[Elizabeth Gillmor via Equest-users]

Not sure which version you are looking at, but I believe you will need to
go with a Appendix G System 5, sorry.  That is officially considered a
Fossil/Electric Hybrid system, not a preheat coil.  See this ASHRAE
interpretation for 90.1-2007:

https://www.ashrae.org/File%20Library/docLib/StdsInterpretations/IC-90-1-2007-15.pdf

If you are looking at newer versions, there might be a more recent ASHRAE
interpretation - worth investigating, but unlikely to have a different
outcome based on their previous interpretation.

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 Tue, Oct 18, 2016 at 11:41 AM, Jeff Ross-Bain via Equest-users <
equest-users at lists.onebuilding.org> wrote:

> Hi All,
>
>
>
> A 50,000 sf building we are looking at has electric DX cooling and
> electric heat VAV terminal boxes in the zones. The only gas use in this
> system is for a small pre-heat coil on the RTU and there is also an energy
> recovery ventilator. In developing the Baseline model, *should we use
> System 5 (gas boiler) or go with System 6 (all electric)?*
>
>
> With gas, I know the default is to use Sys 5 but in this case the pre-heat
> is a very small part of the system so the “predominant” heating energy use
> is electric. The Baseline will still be modeled with the same gas
> pre-heater per Appendix G, either way.
>
>
>
> Many thanks for your thoughts.
>
> Regards,
>
>
>
> *Jeff Ross-Bain, PE, LEED Fellow*
>
> President
>
> 404-220-8955
> *www.rbgb.com <http://www.rbgb.com/>*
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