[Equest-users] Baseline Fan power calculation

[RobertWichert]

It seems to just sum them up in cell M29.  Is that what you meant, 
Maria?  I don't see any calculations, they just ask for you to input the 
fan power.


Am I missing something?


Robert Wichert P.Eng. LEED AP BD&C
+1 916 966 9060
FAX +1 916 966 9068







===============================================

On 3/25/2013 8:24 AM, Maria Karpman wrote:
>
> FYI, the newest LEED EAp2 spreadsheet (attached) has embedded 
> calculations for the baseline fan power on Air-Side HVAC Details tab, 
> which I think is quite handy.
>
> Maria
>
> *From:*equest-users-bounces at lists.onebuilding.org 
> [mailto:equest-users-bounces at lists.onebuilding.org] *On Behalf Of 
> *Bishop, Bill
> *Sent:* Monday, March 25, 2013 11:01 AM
> *To:* RobertWichert; Nick Caton; equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Baseline Fan power calculation
>
> Robert,
>
> I'm sure Nick is typing furiously as I write this, but I'll probably 
> finish before him.
>
> Taking a quick look at the spreadsheet that Nick attached to his 
> email, it calculates baseline fan power using the method described in 
> Appendix G and 6.5.3.1.1. Fan efficiency is included in the P_fan 
> calculation per G3.1.2.9.
>
> Fan efficiency is from ASHRAE 90.1, Table 10.8 as described in G3.1.2.9.
>
> Regards,
>
> Bill
>
> *William Bishop, PE, BEMP, LEED AP **|**Pathfinder Engineers & 
> Architects LLP*
>
> Senior Energy Engineer
>
> 134 South Fitzhugh StreetRochester, NY 14608
>
> T: (585) 325-6004 Ext. 114F: (585) 325-6005
>
> wbishop at pathfinder-ea.com 
> <mailto:wbishop at pathfinder-ea.com>www.pathfinder-ea.com 
> <http://www.pathfinder-ea.com/>
>
> PSustainability -- the forest AND the trees.P
>
> *From:*equest-users-bounces at lists.onebuilding.org 
> <mailto:equest-users-bounces at lists.onebuilding.org> 
> [mailto:equest-users-bounces at lists.onebuilding.org] *On Behalf Of 
> *RobertWichert
> *Sent:* Monday, March 25, 2013 10:52 AM
> *To:* Nick Caton; equest-users at lists.onebuilding.org 
> <mailto:equest-users at lists.onebuilding.org>
> *Subject:* Re: [Equest-users] Baseline Fan power calculation
>
> I believe I have written about this in the past, but since this seems 
> to be on-topic, I'll bring it up again.
>
> The theoretical fan power equation, Fan BHP = (cfm x static press 
> "w.c.) / (6356 x fan efficiency) can be used to calculate the 
> theoretical fan BHP, but you need the fan efficiency.  This seems to 
> be NOT the way the BHP is being calculated by the spreadsheet that was 
> attached previously.
>
> Is there a reason for that?
>
> Was there an assumed fan efficiency used in the spreadsheet, and was 
> it based on anything particular, or just a conservative assumption?
>
>
> Thanks!
>
>
>
> Robert Wichert P.Eng. LEED AP BD&C
> +1 916 966 9060
> FAX +1 916 966 9068
>   
>   
>   
>   
>   
>   
>   
> ===============================================
>
> On 3/25/2013 7:34 AM, Nick Caton 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.P_fan 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 CFM_S and CFM_D
>     carefully at the cited Table.  A CFM quantity representing the
>     airflow each element encounters (CFM_D ) 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
>
>     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>
>     [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
>     <mailto: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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