[Bldg-sim] Baseline pump efficiencies

[Bishop, Bill]

Rathnashree,

 

1)      The ASHRAE baseline pump power requirement has been discussed in
the equest-users forum. There was not a consensus, but the votes were
leaning toward splitting the 22W/gpm between the primary and secondary
pumps, and not assigning 22W/gpm to each pump. See the archives here: 
http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2010
-November/006942.html and here: 
http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2010
-December/007044.html

2)      I believe the inputs for the chilled water pump power would be
"CCIRC-HEAD = 75", "CCIRC-IMPELLER-EFF = 0.65" and "CCIRC-MOTOR-EFF =
1.0".

3)      Again, per the archive threads I provided, there was no
consensus. You need to make a judgment call on how to split the power
up.

4)      I believe the inputs for CW pump power would be "TWR-PUMP-HEAD =
60.0", "TWR-IMPELLER-EFF = 0.60" and "TWR-MOTOR-EFF = 1.0".

 

Regards,

Bill

 

 

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Rathna
Shree
Sent: Tuesday, October 18, 2011 1:54 AM
To: bldg
Subject: [Bldg-sim] Baseline pump efficiencies

 

Dear all,

 

ASHRAE 90.1 appendix G G.3.1.10 defines the base building pump power. I
have basic questions regarding this:

 

1)    Is 22w/gpm for both primary and secondary pumps put together? 

 

2)    The user manual defines 22w/gpm as pump operating against a 75
foot head with 60% combined impellar and motor efficiency.

I work on Visual Doe. I have to input impellar efficiency and motor
efficiency separately. How do i input these values?

 

3)    If 22w/gpm is including secondary pump, then what will be the head
and efficiencies for primary pump and secondary pump?

 

4)    The condenser water pump power is 19 w/gpm. What is the head,
impellar efficiency and motor efficiency?

 

Looking forward for your replies.

 

Regards,

Rathnashree

 

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