[Equest-users] Baseline Pump Power

[Kevin Kelly]

James is right.

 

The way that we were taught to do it was: 

 

"There are several approaches to model 19W/GPM pump power. In one approach,
a simulation can be

performed without entering inputs for pump flow and pump power. The eQuest
report "PV-A Plant

Design Parameters" provides software generated values for pump power and
pump flow. This report

should always be used to verify the W/GPM of the baseline pumps. If the
ratio of pump power to pump

flow is equal to 0.019 kW/GPM, the pump power is ASHRAE compliant. If not,
the mechanical

efficiency should be modified to increase or decrease pump power.
Alternatively, the pump power input

can be modified. However, the flow rate should not be modified in the
baseline model since this may

result in unintended eQuest errors. Please note that as screenshot below
shows, 19 W/GPM

consumption is about equal to a pump having 60% combined motor and
mechanical efficiency operating

at 60ft head. Please refer to note 6 of ASHRAE 90.1 -2004 Table 11.3.2 A for
additional clarification."

 



 

 

Cheers,

Kevin Kelly, LEED AP

Energy Systems Analyst

R3 Energy Management

W: 914.909.3940 x115

kkelly at r3energy.com

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of James
Hansen
Sent: Thursday, January 14, 2010 4:09 PM
To: Eckwahl, Tom; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Baseline Pump Power

 

First you have to pull out the loop/pump flow from the PV-A report, then
multiply by 19 W, and enter that as the pump KW.  I think you also have to
set the pump/motor efficiencies to 1.0 since the ASHRAE 90.1 value of 19 W /
gpm should automatically include losses.  Someone feel free to correct me on
that if it's not right.

 

GHT Limited
James Hansen, PE, LEED AP

Senior Associate

1010 N. Glebe Rd, Suite 200

Arlington, VA  22201-4749

703-338-5754 (Cell)

703-243-1200 (Office)

703-276-1376 (Fax)

 <http://www.ghtltd.com/> www.ghtltd.com

 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Eckwahl,
Tom
Sent: Thursday, January 14, 2010 3:59 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Baseline Pump Power

 

This question has been asked before but I could not find that a response was
posted to the forum.  Baseline case hot water pump power is 19 W/gpm, where
is this value input?

 

Thomas N. Eckwahl
Project Engineer, Mechanical

karpinski
ENGINEERING

 

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