[Equest-users] Cooling EIR and Supply Fan Energy broken down for PVAV w/ PFP (System 6)

[Ting Wang]

Sorry, the screen cap was's very clear.

[image: Inline image 1]

[image: Inline image 2]

On Mon, May 27, 2013 at 4:30 PM, Ting Wang <wangting.ioz at gmail.com> wrote:

> Dear eQuest folks,
>
> The following comment turned up twice in the preliminary and final design
> phase review.
>
> *The SV-A reports indicates that the cooling efficiencies for the HVAC
> systems were not correctly reflected in the Baseline model and the supply
> fan energy has not been broken out as required. The response narrative to
> the Preliminary Review comment number 1 indicates that the cooling
> efficiencies were recalculated and then entered in the Wizard; however as
> stated in the Preliminary Review, eQUEST performs this step automatically
> between the wizard and detailed interface (for example, a 10.0 EER packaged
> DX unit with efficiencies entered in the wizard is shown in the detailed
> interface with a cooling-only EIR of 0.2878 (EER = 11.86)) Section G3.1.2.1
> requires that where efficiency ratings, such as EER and COP, include fan
> energy, the descriptor shall be broken down into its components so that
> supply fan energy can be modeled separately. Note that the cooling
> efficiency without the fan power is typically rated higher than when the
> fan power is included as a component in the rated efficiency If appealing
> this prerequisite, revise the Baseline model so that fans have been broken
> out separately from the cooling EIR indicates in the SV-A report. *
> *
> *
> I attach the sample SV-A and SV-B report below. I modeled this type 6
> baseline system using a PIU, which, based on my digging in the archived
> mailing list, is the closest way to model a VAV system with PFP boxes. The
> cooling EIR was automatically generated in eQuest assuming the supply fan
> energy (ARI 340/360) was subtracted from EER 10. Actually, in the previous
> comment response, I calculated cooling EIR using two approaches found in
> the archived mails (ARI and non-ARI conditions). But our reviews tended to
> neglect the narratives and focus on how to confirm the supply fan energy
> has  been broken out per G3.1.2.1, although the SV-B report already showed
> the modeled PFan.
> *
> *
> *[image: Inline image 1][image: Inline image 2]
> *
> Any ideas on what additional proof documents I need to provide to meet the
> reviewer's requirements?
>
> Thanks
> --
> *王 亭
> Ting Wang / Environment Consultant*
> *BEIJING EVENDESIGN LTD.*
> *T:* +86 10 8776 5074 - 801
> *M:* +86 13910854291
> *E: *wangting.ioz at gmail.com
>



-- 
*王 亭
Ting Wang / Environment Consultant*
*BEIJING EVENDESIGN LTD.*
*T:* +86 10 8776 5074 - 801
*M:* +86 13910854291
*E: *wangting.ioz at gmail.com
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