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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Check the minimum flow ratio and the minimum design flow cfm/sqft for the trouble zones. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In the VAV system equest distributes a percentage of the supply airflow to each zone. But cfm/sqft is a priority in the hierarchy and if you bump it up for the trouble <u>zones</u> you will get higher cooling and heating airflows at your given SAT. The energy you provide to the room is equal to CFM*(Tsupply-Troom)*</span><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>(1.085 or another conversion factor depending on units and air density). </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>So if your schedules and equipment are set up correctly you should override the equest defaults for airflows or SAT.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#52B230'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#52B230'>Joe Fleming, E.I., LEED AP BD+C, BEMP<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#52B230'>Commissioning Agent<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#52B230'>561-602-3132<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#52B230'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Trebuchet MS","sans-serif";color:#52B230'>The Spinnaker Group<o:p></o:p></span></p><p class=MsoNormal><b><u><span style='font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#52B230'><a href="www.thespinnakergroupinc.com"><span style='color:#52B230'>www.thespinnakergroupinc.com</span></a><o:p></o:p></span></u></b></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Brian Goldsmith [mailto:Brian.Goldsmith@atce.com] <br><b>Sent:</b> Thursday, April 07, 2011 4:36 PM<br><b>To:</b> Joe Fleming; equest-users@lists.onebuilding.org<br><b>Subject:</b> RE: [Equest-users] Heat Pump Heating Undersized<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Ya I looked at all that, seemed to be fine. It seems like whenever I change my system from single zone package to variable air volume this problem comes up. I just changed the system type and left everything else the same.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:3.0pt'><b><i><span style='color:#333399;letter-spacing:1.2pt'>Brian Goldsmith</span></i></b><span style='color:navy'><o:p></o:p></span></p><p class=MsoNormal><strong><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt;font-weight:normal'><a href="mailto:Brian.Goldsmith@atce.com" title="blocked::mailto:Brian.Goldsmith@atce.com">Brian.Goldsmith@atce.com</a></span></strong><span class=MsoHyperlink><o:p></o:p></span></p><p class=MsoNormal><strong><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt;font-weight:normal'>direct</span></strong><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt'> 408.487.1217<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><div><div class=MsoNormal align=center style='text-align:center'><hr size=2 width="100%" align=center></div><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Joe Fleming [mailto:joe@thespinnakergroupinc.com] <br><b>Sent:</b> Thursday, April 07, 2011 12:14 PM<br><b>To:</b> Brian Goldsmith; equest-users@lists.onebuilding.org<br><b>Subject:</b> RE: [Equest-users] Heat Pump Heating Undersized</span><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Usually scheduling (fan, available heating and t-stat don’t coincide every hour of every day), airflow (too low), SAT (too low), or multiple zones on one unit.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Usually…</span><b><u><span style='font-size:11.0pt;font-family:"Trebuchet MS","sans-serif";color:#52B230'><o:p></o:p></span></u></b></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Brian Goldsmith<br><b>Sent:</b> Thursday, April 07, 2011 2:24 PM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Heat Pump Heating Undersized<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I’m having trouble with the heating in my heat pump. I modeled a Packaged VAV (PVAVS) with HEAT-SOURCE= Heat Pump and ZONE-HEAT-SOURCE= Not Installed. Set HEAT-SET-T to 120F, DESIGN-HEAT-T to 70F, and did not specify auxiliary heat. I get the message that my zone has insufficient heating capability. Looking at SS-A, is says the maximum heating load is only -10.1 KBTU/HR. Looking at SS-P, the report says my heating capacity is -47.8 KBTU/HR. So why do I have 563 underheated hours? Does it have something to do with the system type? I tried ZONE-HEAT-SOURCE= Heat pump and tried HEAT-SIZING-RATIO= 5, just to see if either one would do anything, although I didn’t really expect them to. Also tried electric supplemental heat, which comes out to -31.715 KBTU/HR. My design supply flow is 1913 CFM, and the outside air flow is 252 CFM. The design supply flow is the same for both the heating and cooling performance summaries. Should this be the case? Thanks for any help.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><em><b><span style='color:#333399;letter-spacing:1.2pt'>Brian Goldsmith, LEED</span></b></em><b><sup><span style='font-size:10.0pt;font-family:"Gill Sans MT";color:#333399;letter-spacing:1.2pt'>®</span></sup><em><span style='color:#333399;letter-spacing:1.2pt'> AP</span></em></b><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;color:#333399'>Design Engineer<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt'><img border=0 width=149 height=30 id="_x0000_i1026" src="cid:image001.jpg@01CBF543.9D871240"><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt'>97 E. Brokaw Road, No 300<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt'>San Jose, CA 95112<o:p></o:p></span></p><p class=MsoNormal><strong><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt;font-weight:normal'>main </span></strong><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt'>408.487.1200<o:p></o:p></span></p><p class=MsoNormal><strong><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt;font-weight:normal'>direct</span></strong><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt'> 408.487.1217</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Gill Sans MT";color:#339966;letter-spacing:1.0pt'><a href="http://www.atce.com/" title="http://www.atce.com/">www.atce.com</a> </span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>