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

[Ting Wang]

Thanks.

Actually the cooling EIR in the first submittal was 0.2878, which was the
default value from wizard (10 EER) to detailed mode. Then after
recalculation using a different equation, I changed the EIR value from
0.2878 to 0.314.  The reviewer raised this same question twice in both
comments.

So I thought maybe the EIR value was not the only evident to prove the fan
power has been broken out and modeled separately.


On Mon, May 27, 2013 at 4:46 PM, 冷面寒枪 <503271081 at qq.com> wrote:

> * 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 ** ,but
> in your SV-A report ,cooling EIR is 0.310(EIR=11.0<11.86),larger than** 0.2878
> (EER = 11.86) in eQUEST detail interface.So the GBCI reviewer think your
> calculation is not correct.*
>
>
> ------------------ 原始邮件 ------------------
> *发件人:* "Ting Wang"**;
> *发送时间:* 2013年5月27日(星期一) 下午4:35
> *收件人:* "equest-users"**;
> *主题:* Re: [Equest-users] Cooling EIR and Supply Fan Energy broken downfor
> PVAV w/ PFP (System 6)
>
> Sorry, the screen cap was's very clear.
>
>
>
>
>
> 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.
>> *
>> *
>> *
>> *
>> 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
>



-- 
*王 亭
Ting Wang / Environment Consultant*
*BEIJING EVENDESIGN LTD.*
*T:* +86 10 8776 5074 - 801
*M:* +86 13910854291
*E: *wangting.ioz at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20130527/8c62c902/attachment-0002.htm>