[Equest-users] App G Baseline CHW Pump Power

[Joe Fleming, PE, BEMP, LEED BD&C]

Has had comments.   Must depend on reviewer.   Be careful you don't put to many eggs into that basket.


Joe Fleming, PE, BEMP, LEED BD&C

-------- Original message --------
From: Nick Caton <ncaton at smithboucher.com> 
Date: 11/27/2013  12:45 PM  (GMT-05:00) 
To: James Hansen <JHANSEN at ghtltd.com>,Christian Kaltreider <ckaltreider at sudassociates.com>,"Bishop, Bill" <bbishop at pathfinder-ea.com>,Joe Fleming <joe at thespinnakergroupinc.com>,equest-users at lists.onebuilding.org 
Subject: RE: [Equest-users] App G Baseline CHW Pump Power 
 
Oh wow, good to know!   I’ll re-revise the procedure I’ve written up for my next chiller baseline!
 
Thanks to GBCI for internally ruling this in a way to grant extra performance/points, I suppose!
 
~Nick
 

 
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: James Hansen [mailto:JHANSEN at ghtltd.com] 
Sent: Wednesday, November 27, 2013 11:41 AM
To: Nick Caton; Christian Kaltreider; Bishop, Bill; Joe Fleming; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] App G Baseline CHW Pump Power
 
For what it's worth, I've used 22 W / gpm for each system (primary and secondary) for the past few LEED projects, and have not had any comments, given that the LEED "Revised Section 1 4 Table" from Dec 2012 specifically lists that the primary and secondary pumping system should be at 22 W  / gpm.  By the way, if you're not using the Table 1.4 excel spreadsheet to document EAp2/EAc1, you should, because it makes it way easier for GBCI to review your model, and it minimizes the chance and/or severity of comments. 
 
CHW Loop Configuration
Primary/secondary per G3.1.3.10
N/A
N/A
Number of Primary CHW Pumps
1 per chiller per G3.1.3.11
N/A
#
N/A
#
Primary CHW Pump Power
22 W/gpm per G3.1.3.10
N/A
 
N/A
W/gpm
Primary CHW Pump Flow
Auto-sized with a capacity ratio of 1.0 based on CHW temperatures
N/A
gpm
N/A
gpm
Primary CHW Pump Control
Constant Flow - each primary pump interlocked to operate with associated chiller - G3.1.3.10, G3.1.3.11
N/A
N/A
Number of Secondary CHW Pumps
1 per G3.1.3.10
N/A
#
N/A
#
Secondary CHW Pump Power
22 W/gpm per G3.1.3.10
N/A
W/gpm
N/A
W/gpm
Secondary CHW Pump Flow
Auto-sized with a capacity ratio of 1.0 based on CHW temperatures
N/A
gpm
N/A
gpm
Secondary CHW Pump Control
<300 tons: riding the pump curve
≥300 tons: variable speed
N/A
 
N/A
 
                            
Regardless of how ASHRAE has ruled, GBCI makes it pretty clear that you should use 22 W / gpm for both primary and secondary loop pumps.
 
GHT Limited
James Hansen, PE, LEED AP, BEMP
Senior Associate
1110 N. Glebe Road, Suite 300
Arlington, VA 22201
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