[Equest-users] Problem with Fan Power in the Baseline Model System 6

[Morteza Kasmai]

Nick,

Thank you so much. You solved my problem. I am always learning from your
comments.

Regards,

Morteza





On Tue, Sep 3, 2013 at 1:01 PM, Nick Caton <ncaton at smithboucher.com> wrote:

>  Hi Morteza!****
>
> ** **
>
> **1.       **Recognize there are separate rules/requirements to determine
> power for system supply/return fans (Pfan), and for terminal unit fans.
> The rules you cited regarding minimum flow fraction and 0.35 W/CFM are
> specific to the fans in the terminal units.  Power for the associated
> supply fan delivering pre-reheat air to those terminal units is determined
> through the “Pfan” procedures.  I advise reviewing the associated passages
> in 90.1 appendix G to ensure you understand what others’ spreadsheets are
> replicating before proceeding.  This will help you to utilize such tools
> correctly and effectively.****
>
> **2.       **There are two means of specifying fan power in eQuest – you
> may use one or the other.  Coming out of the wizards, by default eQuest
> will start with the ESP/fan+motor efficiency inputs.  To instead utilize
> the kW/CFM inputs, navigate to the system fan tab, then right click the
> inputs for ESP/efficiency on the same screen and press ‘r’ or click
> “restore default” in the context menu.  This will switch the input method
> back to kW/CFM and an option to manually define the temperature rise across
> the fan.****
>
> ** **
>
> 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 *Morteza Kasmai
> *Sent:* Tuesday, September 03, 2013 9:16 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Problem with Fan Power in the Baseline Model
> System 6****
>
> ** **
>
> Dear Experts,****
>
> * *I am straggling to input Fan Power in the baseline model (System 6 -
> Packaged VAV with PFP Boxes) and have the following issues:****
>
> 1- In Table 1.4.6 - General HVAC, there is a note for this type of system
> that requires****
>
>  “All Baseline fans in parallel VAV fan-powered boxes sized for 50% of
> peak primary airflow and modeled with 0.35 W/cfm fan power and a minimum
> flow setpoint of 30% of peak (or minimum ventilation rate) per G3.1.3.14”.
> ****
>
> Supply and return air of the system are equal, 49,202 cfm for each. Based
> on this cfm, supply fan power and return fan power is 17.22 KW (49,202 *
> 0.35). This number is different with the figure from ASHRAE 90.1-2007
> Baseline Fan Power Calculator (The spreadsheet from 7group). In addition,
> when I input the supply and return cfm and 17.22 KW for both fans in “Table
> 1.4.7A - Baseline Air-Side HVAC System Schedule”, it indicates “Allowed Fan
> Power” to be 55.4 KW and it will be red out with any other numbers input as
> system fan power.****
>
>  2- In eQUEST’s “Fan Power and Control” screen, the input boxes for supply
> and return design KW/cfm are grayed out (n/) and I cannot input any data
> for the fan powers.****
>
> As always, I would truly appreciate your comments,****
>
> Morteza****
>
> ** **
>
> ** **
>
>
> ****
>
> ****
>
> ** **
>
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