[Equest-users] Modeling Zones with Unit heaters as per ASHRAE 90.1. Appendix G

[Simge Andolsun]

Dear Nathan Miller,

Thank you very much for your response. Would you explain what you meant by
not separating out fan power from the cooling EER?

The solution I was thinking was creating a dummy zone which is exactly the
same as the zone with the unit heater and connecting the baseline cooling
system to this new zone. This doubles the lights and equipment though, but
this could easily be fixed by simply dividing these energy consumption
items by two. What do you think about this solution? Can you think of any
drawback of this solution?

 I'd appreciate it very much if you could help me with these questions,

Thanks,
Best Regards,
Simge Andolsun, PhD


On Fri, Nov 15, 2013 at 5:56 PM, Nathan Miller <nathanm at rushingco.com>wrote:

>  You could always model them as Packaged Terminal Air-Conditioners.
> Define the heat source to match your unit heaters (gas/electric). Then you
> get DX cooling.
>
>
>
> On jobs I’ve worked on with electric resistance heat and no cooling, I’ve
> used the PTAC system type, zeroed out the fan-power, selected electric
> heat, and it was accepted by the reviewers. In that case I DID NOT separate
> out fan power from the cooling EER, since otherwise I would not account for
> the artificial fan energy in addition to the artificial cooling energy
> mandated by having to model a cooling system.
>
>
>
> *Nathan Miller **-* *PE, LEED®AP BD+C, CEM*
>
> *Mechanical Engineer/Senior Energy Analyst *
>
> *RUSHING* | *D* 206-788-4577 | *O* 206-285-7100
>
> *www.rushingco.com <http://www.rushingco.com/>*
>
>
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Simge Andolsun
> *Sent:* Friday, November 15, 2013 3:05 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Modeling Zones with Unit heaters as per ASHRAE
> 90.1. Appendix G
>
>
>
> ASHRAE 90.1. Appendix G says that, even if a zone is heating only in the
> actual building, a cooling system identical to that in the baseline system
> should be modeled in the as-built model with intermittent fan operation to
> meet the loads. I have seen projects with zones that have only unit heaters
> with no cooling air supply. eQuest does not allow for modeling of any
> cooling system in a zone with a unit heater. What would be your approach to
> solving this problem?
>
>
>
> I would appreciate it very much if you could help me with this question.
>
>
>
> Thank you very much in advance for your suggestions,
>
>
>
> Best Regards,
>
> Simge Andolsun, PhD.
>
>
>
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