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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I just wanted to share a lesson learned that I ran across recently while using Equest. Here are the pertinent specs for the building:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Proposed Case<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>65,000 sq ft of laboratory (with ac/hr requirements)<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Cooling is provided by a chilled water district plant<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Heating is provided by a district steam boiler plant<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>100% outdoor air<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Humidity control is being utilized<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Baseline<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Per G3.1.1 Exception (c), baseline system type is #3, Packaged DX, Constant Volume, Fossil Fuel Furnace<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Humidity control is included because it’s in the design case (ASHRAE 90.1-2007 Table G3.1 Part 1.b)<br><span style='color:#1F497D'><img width=756 height=338 id="Picture_x0020_2" src="cid:image001.jpg@01CCD526.B90AFB80" alt="cid:image002.png@01CCD519.AEAE29D0"></span><o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>100% outdoor air, or a percentage to match the proposed<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Because the ASHRAE baseline system was #3, I used the Equest system type “Packaged Single Zone” for the baseline model and then proceeded to pull my hair out for a day because the baseline model was performing better than the proposed. Then I decided to try changing the baseline system type to “Packaged VAV” and setting the fan control to “Constant” with the minimum flow ratio set to “1”, in order to force it to still be a constant volume system. The first thing I noticed after <i>only</i> changing the system type was that the cooling energy almost doubled. The upshot is the following, for these Equest system types:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Packaged Single Zone<o:p></o:p></p><p class=MsoListParagraph style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:12.0pt;margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo4'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>When you add reheat in order to control humidity, the software shows an increase for the heating energy, but does not show an increase in cooling energy. Cooling energy should also increase because it now has additional heat due to reheat to overcome. The place to verify humidity control is the <b>SS-N report</b>, which showed that humidity was not being controlled, despite the fact that I had set the maximum humidity to 60% in the inputs.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo4'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Packaged VAV<o:p></o:p></p><p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;mso-list:l1 level2 lfo4'><![if !supportLists]><span style='font-family:"Courier New"'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>When you add reheat, the software shows an increase in both heating and cooling energy. <b><u>This is correct</u></b>. Otherwise, your baseline building will always perform better than the proposed. Again, verify that humidity is being controlled in the <b>SS-N report</b>.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><u><span style='background:yellow;mso-highlight:yellow'>LESSON LEARNED</span></u><span style='background:yellow;mso-highlight:yellow'>: Always use the Packaged VAV system type in Equest when modeling DX equipment. </span></b><span style='background:yellow;mso-highlight:yellow'> If you have a constant volume system, just adjust the fan control to be “Constant” and the minimum airflow ratio to be “1”.</span> <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I hope this makes sense. Feel free to comment if you’ve had experience with this. Thanks!<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><span style='font-family:"Century Gothic","sans-serif"'>Kristy M. Walson, PE, LEED AP BD+C, BEMP<o:p></o:p></span></b></p><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#333333'>Associate / Sustainability Consultant<o:p></o:p></span></i></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-family:"Century Gothic","sans-serif";color:#006363'>TLC Engineering for Architecture<br></span></b><b><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#006363'>Your 2030 Challenge Partner</span></b><b><span style='font-family:"Century Gothic","sans-serif";color:#006363'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'>255 South Orange Avenue, Suite 1600<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'>Orlando, FL 32801-3463<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0><tr><td valign=bottom style='padding:0in 0in 0in 0in'><p class=MsoNormal align=right style='text-align:right'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#333333'>phone: </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#555555'><o:p></o:p></span></p></td><td valign=bottom style='padding:0in 0in 0in 0in'><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'>407-841-9050<o:p></o:p></span></p></td></tr><tr><td valign=bottom style='padding:0in 0in 0in 0in'><p class=MsoNormal align=right style='text-align:right'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#333333'>fax: </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#555555'><o:p></o:p></span></p></td><td valign=bottom style='padding:0in 0in 0in 0in'><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'>407-425-7367<o:p></o:p></span></p></td></tr><tr><td valign=bottom style='padding:0in 0in 0in 0in'><p class=MsoNormal align=right style='text-align:right'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#333333'>direct: </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#555555'><o:p></o:p></span></p></td><td valign=bottom style='padding:0in 0in 0in 0in'><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'>407-487-1118<o:p></o:p></span></p></td></tr><tr><td valign=bottom style='padding:0in 0in 0in 0in'><p class=MsoNormal align=right style='text-align:right'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#333333'>website: </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#555555'><o:p></o:p></span></p></td><td valign=bottom style='padding:0in 0in 0in 0in'><p class=MsoNormal><a href="http://www.tlc-engineers.com"><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'>www.tlc-engineers.com</span></a><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'><o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Century Gothic","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><a href="http://www.tlc-engineers.com/"><span style='text-decoration:none'><img border=0 width=700 height=49 id="Picture_x0020_1" src="cid:image004.gif@01CCD526.B8EE72D0" alt="http://www.tlc-engineers.com/images/TLC_Sig_Loc_Block.gif"></span></a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>