[bldg-sim] eQUEST: Space cooling question.

[Gerald Pde]

Thanks for all your inputs,
The fancoil system which was defined is a four pipe,
and I suspect that the chilled water loop is always
loaded to provide space cooling whenever necessary.
And I also suspect that the loop in standby model  was
providing for constant flow within the loop thus the
absorbtion chiller need to be cooling all the time to
supply a constant cooling flow within the loop. I
changed the loop operation control to "demand" instead
of "standby" which was previously defined and that
solved the problem.
Thanks again,
Gerald

--- Justin Harrell <harrell at siu.edu> wrote:

> Gerald,
> I would be suspicious of the loop or the chiller
> itself.  Check to  
> make sure that (for a 2-pipe system) that the 3-way
> valve isn't stuck  
> at a minimum setting and sending some water to the
> chiller in  
> winter.  You might also try using a time or
> temperature schedule to  
> make the chiller unavailable in winter.  I hope this
> helps.
> Justin
> 
> On Sep 10, 2005, at 2:48 AM, Gerald Pde wrote:
> 
> > I have a generic single zone space which I am
> trying
> > to model eQUEST. The air-side is a fan coil unit
> and
> > the chiller is an absorption chiller which rejects
> > heat to a colling tower and a boiler that provides
> the
> > cooling. Most values are equest default values.
> Maybe
> > I am missing out something, but I haven't been
> able to
> > figure out in any of the simulation why I am
> getting a
> > significant cooling load in winter. I have tried
> to
> > find this out by removing all space loads and
> outside
> > air loads, but I still get cooling in winter. I
> know
> > its because of some system element which I am not
> > understanding. I tried this with a few system
> types,
> > like VAV, or single zone reheat and it was still
> > giving cooling energy.I tried removed all loads
> and
> > cooling potential, and there was a constant chunk
> of
> > space cooling energy in the system all the year
> round.
> > I know this cannot be any kind of space cooling
> and
> > has to be from some other source.  Can anyone
> enligten
> > me as to where this space cooling is comming from?
> > Your inputs are appreciated.
> > Gerald
> >
> >
> >
> >
> >
>
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