[Equest-users] Baseline Fan power calculation

[vamshi ranga]

Dear Nick Caton,

Thank you very much for valuable inputs, from this it is clear that,

1. However there are different motors used in Proposed case for supply,
return and exhaust with different kW/cfm, we need to use one single motor
in with one kW/cfm in baseline case
2. In EAp2 Section 1 4 Tables of LEED under "Table 1.4.2", it asks
for separate wattage of supply, return and exhaust fans in baseline case,
So, there we need to enter as "Not Applicable"

Please let me know if my understanding is wrong.

Thanks,
Vamshi.


On Mon, Mar 25, 2013 at 8:04 PM, Nick Caton <ncaton at smithboucher.com> wrote:

>  Hi Vamshi,****
>
> ** **
>
> I advise carefully reviewing the footnotes under Table 6.5.3.1.1A, which
> include procedure for determining baseline fan power adjustments.****
>
> ** **
>
> **1.       **Pfan represents the sum power of all fans in a given
> baseline system (with exception to baseline systems #6/#8, fan powered VAV
> boxes).****
>
> **2.       **Again, there is not a separate supply/return power
> calculation (see answer #1).  You can however account for adjustments
> present in separate airstreams from the proposed design.  ****
>
> **3.       **Probably not.  Review the difference between CFMS and CFMDcarefully at the cited Table.  A CFM quantity representing the airflow each
> element encounters (CFMD) should be applied against each pressure drop
> adjustment, not an ‘aggregate’ of supply+return.  ****
>
> ** **
>
> You may also find the attached resource published by 7group helpful to
> cement your procedural understanding of how to arrive at the sum total for
> “A.”  ****
>
> ** **
>
> Regards,****
>
> ** **
>
> ~Nick****
>
> [image: cid:489575314 at 22072009-0ABB]**
>
> * *
>
> *NICK CATON, P.E.*
>
> SENIOR ENGINEER****
>
> ** **
>
> Smith & Boucher Engineers****
>
> 25501 west valley parkway, suite 200****
>
> olathe, ks 66061****
>
> direct 913.344.0036****
>
> fax 913.345.0617****
>
> www.smithboucher.com* *****
>
> ** **
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *vamshi ranga
> *Sent:* Monday, March 25, 2013 8:17 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Baseline Fan power calculation****
>
> ** **
>
> Hi All,****
>
> ** **
>
> I have a doubt regarding calculating fan power as per ASHRAE 90.1-2007.***
> *
>
> ** **
>
> My proposed system has, supply return and exhaust fans separately with kW
> and cfm mentioned for each fan.****
>
> ** **
>
> So, for calculating baseline fan power, ****
>
> ** **
>
> 1. should I calculate it separately for each fan type? ****
>
> 2. can I take pressure drop adjustment both in supply and return fan power
> calculation?****
>
> 3. should I sum all the cfms of supply, return and exhaust and than apply
> pressure drop adjustments to aggregated cfm.****
>
> ** **
>
> Kindly help me out in solving the doubt. If you have any example fan power
> calculations, or web links those could guide me regarding this, plz do
> share them.****
>
> ** **
>
> Thanks in advance.****
>
> ** **
>
> Regards,****
>
> Vamshi.****
>
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