<div>Thanks for the help Neil, I've been successful in setting the system up, and think I am seeing the savings I am looking for.</div>
<div> </div>
<div>Now I'd like to check to make sure plants are running when they should and shouldn't be. Are there ways to:</div>
<div> </div>
<div>1. Specify that a chiller runs at a certain schedule based on the outdoor temperure. ie: I would like the chiller to run when the wet bulb is above 57 degress F, and likewise, I would like the Water-Side Economizer Loop (remember it is a condenser loop) to be the primary cooler when the wet bulb is below 57 deg F.</div>
<div> </div>
<div>2. Set the simulation results to report the hours of operation and corresponding outdoor temperatures for the cooling towers and chillers.</div>
<div> </div>
<div>Thanks All.</div>
<div> </div>
<div> </div>
<div><br><br> </div>
<div class="gmail_quote">On Wed, Jun 8, 2011 at 8:06 PM, Neil Bulger <span dir="ltr"><<a href="mailto:nbulger@integralgroup.com">nbulger@integralgroup.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div lang="EN-US" vlink="purple" link="blue">
<div>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">Hi Patrick,</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">From your question below, it sounds like you are trying to model an integrated water side economizer with two independent cooling tower plants, one for the chiller relief and one for free cooling. To my knowledge, you cannot model a cooling tower attached directly to a chilled water loop in eQuest or stage primary cooling equipment in series (cooling tower then chiller).</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">I would suggest modeling your free cooler as a stand-alone condenser loop and link it to your air system through the water-side economizer coil option, creating two cooling loops essentially. </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">First, on the water side, create a new condenser loop and attach your dedicated cooling tower. Make sure to add a pump. Adjust the loop control temperature to a low setpoint to allow for free cooling, something like 40F maybe with a load-reset control to allow this to float. </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">Second, on your air-side system, there is a tab under <b>cooling</b> for an <b>Economizer</b>. Turning this option from no to <b>yes</b> and select a condenser water loop. On the air-side, the air stream is now pre-cooled and can act as an integrated-water-side economizer, effectively. There are some parameters for the fan penalty of the additional coil it adds on this screen that you may wish to set to zero so effectively, the coil does not modify your fan power calc.</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"><img width="548" height="296"></span><span style="COLOR: #1f497d; FONT-SIZE: 11pt"></span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">Adding this coil will make your stand alone condenser water loop look like the image below. </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"><img width="284" height="244"></span><span style="COLOR: #1f497d; FONT-SIZE: 11pt"></span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">This setup will also give you more control of the waterside-economizer setpoint temperature since the condenser loop will be independent of your primary chilled water loop. This may be good, may be bad, depending on how you wish to control the loop setpoints.</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">I tried this out with a working 90.1 model I have and the new condenser loop shows a cooling load when I look at the PS-H reports. I would suggest playing around with the setup and then run hourly outputs to verify that it is operating in tandem with your chilled water loop as you expect.</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">Best of luck,</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><b><span style="COLOR: gray; FONT-SIZE: 8.5pt">Neil Bulger</span></b><span style="COLOR: gray; FONT-SIZE: 11pt"><br></span><span style="COLOR: gray; FONT-SIZE: 8.5pt">Project Engineer</span></p>
<p class="MsoNormal"><b><span style="COLOR: #99cc00; FONT-SIZE: 8.5pt">________________________________</span></b><span style="COLOR: #1f497d; FONT-SIZE: 11pt"></span></p>
<p class="MsoNormal"><span style="COLOR: #999999; FONT-SIZE: 11pt">I N T E G R A L</span></p>
<p class="MsoNormal"><b><span style="COLOR: #999999; FONT-SIZE: 8.5pt"> </span></b><b><span style="COLOR: gray; FONT-SIZE: 8.5pt"> </span></b><b><span style="COLOR: gray; FONT-SIZE: 8pt">GROUP</span></b><span style="COLOR: gray; FONT-SIZE: 8pt"></span></p>
<p class="MsoNormal"><span style="COLOR: #999999; FONT-SIZE: 8.5pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: gray; FONT-SIZE: 8.5pt">427 13th Street, Oakland CA 94612</span><span style="COLOR: gray; FONT-SIZE: 11pt"><br></span><span style="COLOR: gray; FONT-SIZE: 8.5pt"><a href="tel:510%20663%202070%20x%20235" target="_blank" value="+15106632070">510 663 2070 x 235</a><br>
</span><u><span style="COLOR: blue; FONT-SIZE: 8.5pt"><a href="mailto:nbulger@integralgroup.com" target="_blank">nbulger@integralgroup.com</a></span></u><span style="COLOR: gray; FONT-SIZE: 8.5pt"><br><a href="http://www.integralgroup.com/" target="_blank">www.integralgroup.com</a></span><b><span style="COLOR: #99cc00; FONT-SIZE: 8.5pt"><br>
________________________________</span></b><span style="COLOR: #1f497d"></span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<div style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<p class="MsoNormal"><b><span style="FONT-SIZE: 10pt">From:</span></b><span style="FONT-SIZE: 10pt"> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Patrick Keeney<br>
<b>Sent:</b> Tuesday, June 07, 2011 10:39 AM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] closed loop cooling tower on the chilled water loop</span></p>
</div>
<div>
<div></div>
<div class="h5">
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">Hello All,</p></div>
<div>
<p class="MsoNormal"> </p></div>
<div>
<p class="MsoNormal">Has anyone had any luck modeling a closed loop cooling tower that is only attached to the chilled water loop? I would like to have the chilled water loop have a closed loop CT that runs in series with the chiller with a bypass valve when it allows. On the condenser loop would then be an open loop CT for heat rejection from the chiller.</p>
</div>
<div>
<p class="MsoNormal"> </p></div>
<div>
<p class="MsoNormal">This closed loop CT will essentially act as "free cooler" when the wet bulb is low enough and bypass the chiller, otherwise the chiller will make up the rest of the cooling when the wet bulb is too high.</p>
</div>
<div>
<p class="MsoNormal"> </p></div>
<div>
<p class="MsoNormal">Any help would be great.</p></div>
<div>
<p class="MsoNormal"><br clear="all"><br>-- <br>Patrick J Keeney<br>MArch-MSSD Candidate<br><a href="tel:410-299-5627" target="_blank">410-299-5627</a></p></div></div></div></div></div></blockquote></div><br><br clear="all">
<br>-- <br>Patrick J Keeney<br>MArch-MSSD Candidate<br>410-299-5627<br>