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

[Carol Gardner]

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)
>>
>> www.ghtltd.com
>>
>> * *
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> ------------------------------
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