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<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 width=149 height=30 id="_x0000_i1025"
src="cid:image001.jpg@01CBF516.42D804D0"><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><U3:PLACE u4:st="on"><U3:CITY u4:st="on"><U1:PLACE u2:st="on"><U1:CITY u2:st="on"><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></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'></U1:CITY>, <U1:STATE u2:st="on"><st1:State
w:st="on">CA</U1:STATE></st1:State> <U1:POSTALCODE u2:st="on"><st1:PostalCode
w:st="on">95112</U1:POSTALCODE></U1:PLACE></U3:CITY></U3:PLACE></st1:PostalCode><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>
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12.0pt'><o:p> </o:p></span></font></p>
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