<div dir="ltr"><div><div><div><div>John,<br><br></div><div>Never did a waterside economizer for RTUs, but a couple of points I think I remember:<br><br></div>The waterside economizer in eQuest is all or nothing: if it can satisfy the entire load, then it's on, otherwise it's off. Are you autosizing or hardsizing it?<br><br></div>It also poses the questions of how you reset the condenser water loop temperature, and how you reset the rooftop supply air temperature during low load condition.<br><br></div>What are your current settings?<br><br></div>Julien<br><div><div><br><br></div></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div>--<br>Julien Marrec, EBCP, BPI MFBA<br>Energy&Sustainability Engineer<br>T: +33 6 95 14 42 13<br><span style="color:rgb(0,0,0)"><br></span><span style="color:rgb(0,0,0)">LinkedIn (en) : <span style="color:rgb(0,0,0)"><a href="http://www.linkedin.com/in/julienmarrec" target="_blank">www.linkedin.com/in/julienmarrec</a><br></span>LinkedIn (fr) : <a href="http://www.linkedin.com/in/julienmarrec/fr" target="_blank">www.linkedin.com/in/julienmarrec/fr</a></span><br><span style="color:rgb(0,0,0)"><a href="http://www.linkedin.com/in/julienmarrec" target="_blank"></a></span></div></div></div></div>
<br><div class="gmail_quote">2015-11-05 15:11 GMT+01:00 John Aulbach <span dir="ltr"><<a href="mailto:jra_sac@yahoo.com" target="_blank">jra_sac@yahoo.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="color:#000;background-color:#fff;font-family:verdana,helvetica,sans-serif;font-size:16px"><div dir="ltr">Hello all and HALP !!</div><div dir="ltr"><br></div><div dir="ltr">I have an office building in Los Angeles that is looking to go LEED Core and Shell. It has some exterior and back of the house lighting, so the savings there make sense. But the building has 6 DX 30-50 ton Trane rooftop package units, two on the 1st floor and one for each of the other 4 floors. These are WATER COOLED units.</div><div dir="ltr"><br></div><div dir="ltr">These units have a central outside air stream, and have WATER SIDE ECONOMIZERS.</div><div dir="ltr"><br></div><div dir="ltr">My Base model has an air side economizer (still water cooled condensers). The proposed model removes the air side and replaces it with the water side.</div><div dir="ltr"><br></div><div dir="ltr">The units themselves are EER 14+, whereas the Base units are 10.8 EER.</div><div dir="ltr"><br></div><div dir="ltr">Results show a SLIGHT savings in Space Cooling, which I attribute to the EER improvement MINUS the air side economizer removal (Jan and Dec space cooling load INCREASES in the Proposed Case).</div><div dir="ltr"><br></div><div dir="ltr">But the pumping energy skyrockets about 50% (remember, no chilled water).</div><div dir="ltr"><br></div><div dir="ltr">I am unsure if I am running the water side correctly. There is only the one line of data at ever SYSTEM level.</div><div dir="ltr"><br></div><div dir="ltr">Help??</div><div dir="ltr"><br></div><div dir="ltr">John R. Aulbach</div><div dir="ltr">Aging engineer (by the minute)</div></div></div><br>_______________________________________________<br>
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