Pump kW/gpm

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Dear all,

Can someone tell me where I can enter the pump kW/gpm in eQUEST?

I can see 2 input boxes: 1 for kW and 1 for gpm. If I need to enter
22W/gpm for my baseline chilled water loop pump, how can I do this if I
do not have numbers for the wattage and flow?

Thanks!

Omar Katanani

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Enter the following:

Chilled Water:
Head: 75
Motor eff: 1
Mech eff: .65

Hot Water:
Head: 60
Mech eff: 1
Motor eff: .60

Condenser Water:
Head: 60
Mech eff: 1
Motor eff: .60

Leave everything else blank to autosize.

Source: ASHRAE 90.1-2007 Section 11 Page 72

Timothy Howe, MS, LEED? AP

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Thanks Timothy!

I never read section 11 of ASHRAE 90.1...

Is this method approved for LEED purposes?

Thanks!

Omar Katanani

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The ASHRAE 90.1 Section that Timothy referred to is meant to be used with the
Energy Cost Budget method. This is not he method that LEED uses. To get your
pump power equal to 19 W/GPM, I would suggest adjusting the static head of the
pump until you get the desired W/GPM from the output file.

-Eddie

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Correct, I did reference Section 11, but the ECB and PRM have the same pumping power requirements, and Section 11 gives the details on how to reach those pumping power requirements.

FYI you will never get 19.0000000 W/GPM or 22.000000 W/GPM, it is always very close, say 18.87 or 21.95 for example, which is close enough for energy modeling and EAC1 purposes.

I used to use the hunt and peck method which Eddie referenced until I read Section 11.

Timothy Howe, MS, LEED? AP

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