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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>So if I force the cfm/sqft to 2, it brings
the unmet load hours down to about 80, which is good. But of course the fan
energy spikes. Each zone has its own unit. Is it good practice to force the
cfm/sqft? Especially considering what this does to the fan energy?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:3.0pt'><b><i><font
size=3 color="#333399" face="Times New Roman"><span style='font-size:12.0pt;
color:#333399;letter-spacing:1.2pt;font-weight:bold;font-style:italic'>Brian
Goldsmith</span></font></i></b><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><strong><b><font size=1 color=green face="Gill Sans MT"><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></font></b></strong><span
class=MsoHyperlink><u><font color=blue><o:p></o:p></font></u></span></p>
<p class=MsoNormal><strong><b><font size=1 color=green face="Gill Sans MT"><span
style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:
1.0pt;font-weight:normal'>direct</span></font></b></strong><font size=1
color=green face="Gill Sans MT"><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></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Joe Fleming
[mailto:joe@thespinnakergroupinc.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, April 07, 2011
1:55 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Brian Goldsmith;
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Equest-users] Heat
Pump Heating Undersized</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Check the minimum
flow ratio and the minimum design flow cfm/sqft for the trouble zones.
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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></font><font
size=2 color="#1f497d" face=Calibri><span style='font-size:10.0pt;font-family:
Calibri;color:#1F497D'>(1.085 or another conversion factor depending on units
and air density). </span></font><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;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></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color="#52b230" face="Trebuchet MS"><span
style='font-size:11.0pt;font-family:"Trebuchet MS";color:#52B230'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#52b230" face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:#52B230'>Joe Fleming,
E.I., LEED AP BD+C, BEMP<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#52b230" face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:#52B230'>Commissioning
Agent<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#52b230" face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:#52B230'>561-602-3132<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#52b230" face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:#52B230'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#52b230" face="Trebuchet MS"><span
style='font-size:10.0pt;font-family:"Trebuchet MS";color:#52B230'>The Spinnaker
Group<o:p></o:p></span></font></p>
<p class=MsoNormal><b><u><font size=2 color="#52b230" face="Trebuchet MS"><span
style='font-size:11.0pt;font-family:"Trebuchet MS";color:#52B230;font-weight:
bold'><a href="www.thespinnakergroupinc.com"><font color="#52b230"><span
style='color:#52B230'>www.thespinnakergroupinc.com</span></font></a><o:p></o:p></span></font></u></b></p>
</div>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Brian Goldsmith
[mailto:Brian.Goldsmith@atce.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, April 07, 2011
4:36 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Joe Fleming;
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Equest-users] Heat
Pump Heating Undersized<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;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></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:3.0pt'><b><i><font
size=3 color="#333399" face="Times New Roman"><span style='font-size:12.0pt;
color:#333399;letter-spacing:1.2pt;font-weight:bold;font-style:italic'>Brian
Goldsmith</span></font></i></b><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><strong><b><font size=1 color=green face="Gill Sans MT"><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></font></b></strong><span
class=MsoHyperlink><u><font color=blue><o:p></o:p></font></u></span></p>
<p class=MsoNormal><strong><b><font size=1 color=green face="Gill Sans MT"><span
style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:
1.0pt;font-weight:normal'>direct</span></font></b></strong><font size=1
color=green face="Gill Sans MT"><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></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Joe Fleming
[mailto:joe@thespinnakergroupinc.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, April 07, 2011
12:14 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Brian Goldsmith;
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Equest-users] Heat
Pump Heating Undersized</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Usually…</span></font><b><u><font
size=2 color="#52b230" face="Trebuchet MS"><span style='font-size:11.0pt;
font-family:"Trebuchet MS";color:#52B230;font-weight:bold'><o:p></o:p></span></font></u></b></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Brian Goldsmith<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, April 07, 2011
2:24 PM<br>
<b><span style='font-weight:bold'>To:</span></b>
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Equest-users] Heat Pump
Heating Undersized<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><em><b><i><font size=3 color="#333399" face="Times New Roman"><span
style='font-size:12.0pt;color:#333399;letter-spacing:1.2pt;font-weight:bold'>Brian
Goldsmith, LEED</span></font></i></b></em><b><sup><font size=2 color="#333399"
face="Gill Sans MT"><span style='font-size:10.0pt;font-family:"Gill Sans MT";
color:#333399;letter-spacing:1.2pt;font-weight:bold'>®</span></font></sup><em><i><font
color="#333399" face="Times New Roman"><span style='color:#333399;letter-spacing:
1.2pt'> AP</span></font></i></em></b><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#333399" face="Times New Roman"><span
style='font-size:11.0pt;color:#333399'>Design Engineer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=green face="Gill Sans MT"><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@01CBF5D3.DC7BB330"><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=1
color=green face="Gill Sans MT"><span style='font-size:7.5pt;font-family:
"Gill Sans MT";color:green;letter-spacing:1.0pt'>97 E. Brokaw Road</span></font></st1:address></st1:Street><font
size=1 color=green face="Gill Sans MT"><span style='font-size:7.5pt;font-family:
"Gill Sans MT";color:green;letter-spacing:1.0pt'>, No 300<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=1
color=green face="Gill Sans MT"><span style='font-size:7.5pt;font-family:
"Gill Sans MT";color:green;letter-spacing:1.0pt'>San Jose</span></font></st1:City><font
size=1 color=green face="Gill Sans MT"><span style='font-size:7.5pt;
font-family:"Gill Sans MT";color:green;letter-spacing:1.0pt'>, <st1:State
w:st="on">CA</st1:State> <st1:PostalCode w:st="on">95112</st1:PostalCode></span></font></st1:place><font
size=1 color=green face="Gill Sans MT"><span style='font-size:7.5pt;font-family:
"Gill Sans MT";color:green;letter-spacing:1.0pt'><o:p></o:p></span></font></p>
<p class=MsoNormal><strong><b><font size=1 color=green face="Gill Sans MT"><span
style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:
1.0pt;font-weight:normal'>main </span></font></b></strong><font
size=1 color=green face="Gill Sans MT"><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></font></p>
<p class=MsoNormal><strong><b><font size=1 color=green face="Gill Sans MT"><span
style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:
1.0pt;font-weight:normal'>direct</span></font></b></strong><font size=1
color=green face="Gill Sans MT"><span style='font-size:7.5pt;font-family:"Gill Sans MT";
color:green;letter-spacing:1.0pt'> 408.487.1217</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color="#339966" face="Gill Sans MT"><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></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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