<html><head></head><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr">Hello all and HALP !!</div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr"><br></div><div id="yui_3_16_0_1_1446732033770_5281" 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 id="yui_3_16_0_1_1446732033770_5281" dir="ltr"><br></div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr">These units have a central outside air stream, and have WATER SIDE ECONOMIZERS.</div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr"><br></div><div id="yui_3_16_0_1_1446732033770_5281" 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 id="yui_3_16_0_1_1446732033770_5281" dir="ltr"><br></div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr">The units themselves are EER 14+, whereas the Base units are 10.8 EER.</div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr"><br></div><div id="yui_3_16_0_1_1446732033770_5281" 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 id="yui_3_16_0_1_1446732033770_5281" dir="ltr"><br></div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr">But the pumping energy skyrockets about 50% (remember, no chilled water).</div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr"><br></div><div id="yui_3_16_0_1_1446732033770_5281" 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 id="yui_3_16_0_1_1446732033770_5281" dir="ltr"><br></div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr">Help??</div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr"><br></div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr">John R. Aulbach</div><div id="yui_3_16_0_1_1446732033770_5281" dir="ltr">Aging engineer (by the minute)</div></div></body></html>