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My understanding (feel free to correct, those who know):<br>
<br>
- the water side economizer chiller is the newer, more correct way
of modelling the system you describe -- where a plate frame heat
exchanger is in parallel with the chiller with chilled water on 1
side and condenser water on the other. This is what I use.<br>
<br>
- the air-side, water-side economizer tab adds a new cooling coil
connected to the condenser loop to precool your incoming air as well
as pre-cooling the condenser water before it goes to the chiller.
Similar but this adds fan energy (static across the new chiller) and
pumping energy and isn't really how a water-side economizer system
that I am familiar with is implemented (at least around here).<br>
<br>
- in DOE-2.1e, you used to be able to set your cooling tower control
to "strainer cycle" which would also give you a water-side
economizer but I believe this was lost in going to DOE-2.2, with
real loops etc. Adding the water-side economizer chiller, restored
this function.<br>
<br>
One more note -- I understand that you do not need a load management
or equipment control to operate a water-side economizer chiller ...
and further if you add them, they will be ignored anyway. If there
is sufficient cooling based on the outdoor air temperature for the
water-side economizer chiller to carry the full cooling load, then
it will operate (for that 1 hour timestep). Otherwise, it will not
operate and the chillers will carry the full cooling load. There is
no partial operating mode.<br>
<br>
Cheers,<br>
<br>
Brian<br>
<br>
<br>
<br>
On 6/6/2011 1:09 PM, Patrick Keeney wrote:
<blockquote
cite="mid:BANLkTim09a0RC7stvrEkU3DWuf4WfzoTkg@mail.gmail.com"
type="cite">
<div>Hi All,</div>
<div> </div>
<div>What is the difference between a "water side economizer
chiller" and a "water side ecomizer," which you find under the
air-side HVAC cooling subtab? What does each do for their
respective systems?</div>
<div> </div>
<div>I am trying to model a water-side economizer that runs in
series with the other chiller, so I am pretty sure that I want
the "water-side economizer chiller." I just want to be sure
because there is a substantial difference between the two in
energy savings (water-side ecomizer chiller is more efficient).</div>
<div> </div>
<div>Thanks,</div>
<div> </div>
<div>Patrick<br clear="all">
</div>
<div> </div>
<div>-- <br>
Patrick J Keeney<br>
MArch-MSSD Candidate<br>
410-299-5627<br>
</div>
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