[Bldg-sim] chilled water pump power

[James V. Dirkes II P.E.]

Good question!  My guess is that each pump may be 22W / gpm.  Since they are
required to use variable speed drives (for >300T), it won't affect energy
adversely.
 
There may be an ASHRAE clarification on this topic; have you checked with
them?
 

The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653

 

 

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From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of xiao dongyi
Sent: Thursday, January 08, 2009 6:18 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] chilled water pump power


Hi,
 
I have a question regarding the chilled water pump power calculation in
ASHRAE 90.1 Appendix G:
 
ASHRAE 90.1 Appendix G Paragraph G3.1.3.10 requires that "The baseline
building design pump power shall be 22 W/gpm.". If the chilled water pumping
system is a primary-secondary system, how does this rule apply? i.e. does
the 22 W/gpm apply to the primary pump, secondary pump, or both? Or, do I
need to divide it between the primary and secondary pump?
 
Your suggestions will be greatly appreciated.
 
Thanks,
 
Dongyi


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