[Equest-users] SUPPLY-KW/FLOW

[Brett Fero]

How about this:

9.9 BHP (output)/0.93 eff = 10.645 hp (input)
10.645 hp input x 0.7457 kW/hp = 7.94 kW

Brett Fero, P.E., LEED AP
RobsonWoese Inc.
Salina Meadows Office Park
301 Plainfield Road, Suite 180
Syracuse, NY 13212
Phone:   315-445-2650
Fax:  315-445-0958
bfero at robsonwoese.com<mailto:bfero at robsonwoese.com>

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Vikram Sami
Sent: Thursday, September 17, 2009 2:40 PM
To: Lars Fetzek; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] SUPPLY-KW/FLOW

Maybe I'm mistaken here, but I've always understood the Supply flow to be kW/cfm. So if your design condition is 9.9 BHP, what is the design flow rate (in cfm) that goes with that?

So for instance if your design flow rate is 20,000 cfm at 9.90 BHP, then your Supply KW/Flow = 12.83/20,000 = 0.000642




Vikram Sami, LEED AP
Direct Phone 404-253-1466 | Direct Fax 404-253-1366
LORD, AECK & SARGENT ARCHITECTURE

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Lars Fetzek
Sent: Wednesday, September 16, 2009 4:48 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] SUPPLY-KW/FLOW

eQuesters & DOE2-2ers,

    The DOE2-2 dictionary loves to use the phrase, "total fan power per unit flow" in defining SUPPLY-KW/FLOW.  Clear as mud.
    I figured this:  At design conditions, the supply fan runs at 9.90 BHP and 61.89% efficiency and the per-unit flow is at unity ( x CFM / x CFM = 1).  The motor nominal efficiency is 93%.  (No, I don't have a motor efficiency curve.)  0.746 kW  = 1 HP.  Therefore, the fan kW  =  9.90 * 0.746 / ( 0.6189 * 0.93 )  =  12.83 kW.  The per unit flow is 1.  So... SUPPLY-KW/FLOW  = 12.83, which I type into my .inp file.
    Naturally, eQuest gives me an error message, insisting that SUPPLY-KW/FLOW must be between 0.0 and .0080.  Evidently, there is some discrepancy involving units or the meaning of "per unit" in the context of the quoted phrase.
    Can anyone clarify what eQuest really means and how to calculate SUPPLY-KW/FLOW?  Is it supposed to be KW-per-CFM?
    Thanks!

Lars Fetzek, EI
Phoenix Engineering Group
Tampa, Florida

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