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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi everyone,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I wanted to do a gut check of whether I'm interpreting ASHRAE 90.1-2007 Section G3.1.3.13 correctly.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>That section says:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='mso-margin-top-alt:2.15pt;margin-right:2.95pt;margin-bottom:0in;margin-left:0in;margin-bottom:.0001pt;text-align:justify;text-indent:.1in;line-height:12.0pt;mso-line-height-rule:exactly'><b><span style='font-size:10.0pt;font-family:"Times New Roman","serif";letter-spacing:.05pt'>G</span></b><b><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>3<span style='letter-spacing:.05pt'>.</span>1<span style='letter-spacing:-.05pt'>.</span><span style='letter-spacing:.05pt'>3</span><span style='letter-spacing:-.05pt'>.</span><span style='letter-spacing:.05pt'>1</span>3 <span style='letter-spacing:-1.3pt'>V</span><span style='letter-spacing:-1.45pt'>A</span>V<span style='letter-spacing:.25pt'> </span>M<span style='letter-spacing:.05pt'>i</span>n<span style='letter-spacing:.05pt'>i</span>m<span style='letter-spacing:.05pt'>u</span>m <span style='letter-spacing:.05pt'>Fl</span><span style='letter-spacing:-.1pt'>o</span>w<span style='letter-spacing:.25pt'> </span><span style='letter-spacing:.05pt'>S</span>et<span style='letter-spacing:.05pt'>p</span>oi<span style='letter-spacing:.05pt'>n</span>ts<span style='letter-spacing:.1pt'> </span>(<span style='letter-spacing:.05pt'>S</span>ys<span style='letter-spacing:.05pt'>t</span>ems<span style='letter-spacing:.1pt'> </span>5 and<span style='letter-spacing:1.45pt'> </span><span style='letter-spacing:.05pt'>7</span>).<span style='letter-spacing:1.5pt'> </span></span></b><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Min<span style='letter-spacing:.05pt'>i</span>mum<span style='letter-spacing:1.25pt'> </span><span style='letter-spacing:-.2pt'>v</span>ol<span style='letter-spacing:.05pt'>u</span>me<span style='letter-spacing:1.3pt'> </span>set<span style='letter-spacing:.05pt'>p</span>oin<span style='letter-spacing:.05pt'>t</span>s<span style='letter-spacing:1.2pt'> </span>for<span style='letter-spacing:1.45pt'> </span><span style='letter-spacing:-1.3pt'>VA</span>V<span style='letter-spacing:1.4pt'> </span>reheat<span style='letter-spacing:1.35pt'> </span>b<span style='letter-spacing:.05pt'>o</span><span style='letter-spacing:-.2pt'>x</span>es <span style='letter-spacing:.05pt'>s</span>h<span style='letter-spacing:.05pt'>a</span>ll<span style='letter-spacing:-.25pt'> </span><span style='letter-spacing:.05pt'>b</span>e<span style='letter-spacing:-.15pt'> </span><span style='letter-spacing:.05pt'>0</span><span style='letter-spacing:-.05pt'>.</span>4<span style='letter-spacing:-.15pt'> </span><span style='letter-spacing:.05pt'>cf</span>m<span style='letter-spacing:.05pt'>/</span>f<span style='letter-spacing:.05pt'>t</span></span><span style='font-size:8.0pt;font-family:"Times New Roman","serif";position:relative;top:-4.0pt;mso-text-raise:4.0pt'>2<span style='letter-spacing:-.35pt'> </span></span><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>of<span style='letter-spacing:-.2pt'> </span>floor<span style='letter-spacing:-.25pt'> </span>area<span style='letter-spacing:-.2pt'> </span>ser<span style='letter-spacing:-.1pt'>v</span>ed<span style='letter-spacing:-.3pt'> </span>or<span style='letter-spacing:-.15pt'> </span>the<span style='letter-spacing:-.15pt'> </span>minimum<span style='letter-spacing:-.45pt'> </span><span style='letter-spacing:-.2pt'>v</span>ent<span style='letter-spacing:.05pt'>i</span>lati<span style='letter-spacing:.05pt'>o</span>n<span style='letter-spacing:-.3pt'> </span>rate,<span style='letter-spacing:-.15pt'> </span>wh<span style='letter-spacing:.05pt'>i</span>ch<span style='letter-spacing:-.2pt'>ev</span>er<span style='letter-spacing:-.4pt'> </span><span style='letter-spacing:.05pt'>i</span>s<span style='letter-spacing:-.05pt'> </span><span style='letter-spacing:.05pt'>l</span>a<span style='letter-spacing:-.2pt'>r</span>ge<span style='letter-spacing:-.5pt'>r</span>.<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have a number of System 5s for a warehouse facility with very low heating/cooling loads.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If I set the minimum flow for all zones to 0.4 in this screen, it ends up substantially over-supplying the baseline zones.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><img width=692 height=591 id="Picture_x0020_1" src="cid:image001.png@01CE7BC7.14C70A20"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Since there are maximum cooling supply temperatures (60 degrees), I end up overcooling the zones even at minimum load, so there is reheat. There is also cooling energy to get the supply temps down to 60.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Am I doing anything "wrong"?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I seem to be following the requirements of 90.1, just want to make sure there isn't an exception somewhere that I'm missing.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks!<b><span style='font-family:"Arial","sans-serif";color:teal'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:teal'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:teal'>GHT Limited<br></span></b><b><span style='font-family:"Arial","sans-serif"'>James Hansen, P.E., LEED AP</span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>Senior Associate<br>1010 N. Glebe Road, Suite 200<br>Arlington, VA 22201-4749<br>703-243-1200 (office)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>703-338-5754 (cell)<br>703-276-1376 (fax)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><a href="http://www.ghtltd.com/" title="http://www.ghtltd.com/"><span style='color:blue'>www.ghtltd.com</span></a></span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>