[Equest-users] Can't force pump power to Zero?

[Eric Studer]

Another trick is to let the pump do whatever it wants, but make a ghost
electric utility meter to handle all the electric end uses that are included
in the model to simulate non-standard systems.  The energy use of the
various meters will be reported separately in the PS-F reports, so use the
output from the EM1 when calculating actual project energy use.

 

Eric

 

Ph:   (781) 431-1100 ext 12
Fax:  (781) 431-1109

 

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From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Carol
Gardner
Sent: Wednesday, April 14, 2010 4:24 PM
To: Pasha Korber-Gonzalez
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Can't force pump power to Zero?

 

I agree with Pasha. Additionally, you might want to put in a really low
number for the pump head. Maybe try one at a time and then both?

Carol

On Wed, Apr 14, 2010 at 1:05 PM, Pasha Korber-Gonzalez
<pasha.pkconsulting at gmail.com> wrote:

James.  I would suggest trying 0.0001 for your input.  sometimes DOE2
doesn't like an exact 0 number value, so I typically practice with input
values set at 0.001 or as low as I can input with the value restrictions.

 

that's what I can offer for now.

 

Pasha

On Wed, Apr 14, 2010 at 8:56 AM, James Hansen <JHANSEN at ghtltd.com> wrote:

I've got a fairly simple primary/secondary chilled water system with a
waterside economizer chiller.

 

I've already got a secondary chilled water pump circulating primary chilled
water to the systems in my proposed building, and it does double duty as
pumping through the heat exchanger in my proposed design.  So the chilled
water pump that I've set up for the waterside economizer (to regulate
maximum flow) really has Zero power consumption.

 

However, when I set the KW to 0.00 for this pump, eQuest is STILL
auto-sizing something and forcing the KW to around 32 KW.  I even set the
efficiencies to 1.0 to see if that made a difference (doesn't).  I'm not
sure if it has something to do with the warning about the pump not being
able to match system flow at the minimum required head.but why can't I force
this KW to 0??

 

Has anyone ever run into this?  Here's a screenshot of my input for that
pump and the PV-A output.  Thanks in advance!

 

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

 



 

 



 

 

 


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