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<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Whenever I have multiple zones served by a
single zone AHU this is what I do:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>In Detailed Edit </span></font><font
size=2 color=blue face=Wingdings><span style='font-size:10.0pt;font-family:
Wingdings;color:blue'>à</span></font><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'>“Air-Side HVAC”
tab</span></font><font size=2 color=blue face=Wingdings><span style='font-size:
10.0pt;font-family:Wingdings;color:blue'>à</span></font><font size=2
color=blue face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:blue'> Select a space</span></font><font size=2 color=blue
face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings;color:blue'>à</span></font><font
size=2 color=blue face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:blue'> “Spreadsheet” Tab </span></font><font size=2
color=blue face=Wingdings><span style='font-size:10.0pt;font-family:Wingdings;
color:blue'>à</span></font><font size=2 color=blue face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:blue'> restore to default
(right click) any zones that are not the control zone in the “Heat Temp
and Cool Temp Schedule” columns. You can also set one zone to be the Cool
Temp control zone and another to be the Heat Temp control zone. This eliminates
the issue when the zone with the highest cooling demand has the lowest heating
demand and vice versa.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Hope this helps!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=blue face=Georgia><span style='font-size:
10.0pt;font-family:Georgia;color:blue'>Seth Spangler, EIT, LEED® AP <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Georgia><span style='font-size:
10.0pt;font-family:Georgia;color:blue'>Project Engineer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Georgia><span style='font-size:
12.0pt;font-family:Georgia;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Georgia><span style='font-size:
10.0pt;font-family:Georgia;color:blue'>RMF Engineering, Inc <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Georgia><span style='font-size:
10.0pt;font-family:Georgia;color:blue'>Ph: (843) 971-9639 ext:1497</span></font><font
color=blue><span style='color:blue'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Georgia><span style='font-size:
10.0pt;font-family:Georgia;color:blue'>Fax: (843) 971-9641 <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Georgia><span style='font-size:
10.0pt;font-family:Georgia;color:blue'>sspangle@rmf.com</span></font><font
size=2 face=Georgia><span style='font-size:10.0pt;font-family:Georgia'><o:p></o:p></span></font></p>
</div>
<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 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'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Bishop, Bill<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 15, 2009 4:59
PM<br>
<b><span style='font-weight:bold'>To:</span></b> Lam, Linda;
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] PSZ-HP
High heating unmet load hours</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=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Linda,<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'>Try changing your control zone to
different zones to reduce your underheated and undercooled hours. Instead of
zones not getting enough heat, it could be that they are getting overcooled.
Check your SS-R and SS-O reports. You might also need to adjust supply flow in
specific zones instead of on a system-wide basis.<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'>Bill<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><b><font size=2 color=black face="Franklin Gothic Medium"><span
style='font-size:10.0pt;font-family:"Franklin Gothic Medium";color:black;
font-weight:bold'>William Bishop</span></font></b><b><font size=2 color=black
face="Franklin Gothic Medium Cond"><span style='font-size:10.0pt;font-family:
"Franklin Gothic Medium Cond";color:black;font-weight:bold'>, EIT, LEED<sup>®</sup>
AP</span></font></b><b><font size=2 color="#003300"
face="Franklin Gothic Medium Cond"><span style='font-size:10.0pt;font-family:
"Franklin Gothic Medium Cond";color:#003300;font-weight:bold'> </span></font></b><b><font
size=2 color=green face="Franklin Gothic Medium Cond"><span style='font-size:
10.0pt;font-family:"Franklin Gothic Medium Cond";color:green;font-weight:bold'>|</span></font></b><b><font
size=2 color="#003300" face="Franklin Gothic Medium Cond"><span
style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond";color:#003300;
font-weight:bold'> </span></font></b><b><font size=2 color=black
face="Franklin Gothic Medium Cond"><span style='font-size:10.0pt;font-family:
"Franklin Gothic Medium Cond";color:black;font-weight:bold'>Pathfinder
Engineers LLP<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:black'>Mechanical Engineer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
3.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><st1:address w:st="on"><st1:address w:st="on"><st1:Street
w:st="on"><font size=1 color=navy face=Arial><span style='font-size:9.0pt;
font-family:Arial;color:navy'>134 South Fitzhugh Street</span></font></st1:Street></st1:address><font
size=1 color=navy><span style='font-size:9.0pt;color:navy'><br>
</span></font><st1:City w:st="on"><font size=1 color=navy face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:navy'>Rochester</span></font></st1:City><font
size=1 color=navy face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:navy'>, <st1:State w:st="on">NY</st1:State> <st1:PostalCode w:st="on">14608</st1:PostalCode></span></font></st1:address><font
size=1 color=navy><span style='font-size:9.0pt;color:navy'><br>
</span></font><font size=1 color=navy face=Arial><span style='font-size:9.0pt;
font-family:Arial;color:navy'>T: (585) 325-6004 </span></font><font size=1
color=black face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:black'>Ext. 114</span></font><font size=1 color=navy><span
style='font-size:9.0pt;color:navy'><br>
</span></font><font size=1 color=navy face=Arial><span style='font-size:9.0pt;
font-family:Arial;color:navy'>F: (585) 325-6005</span></font><font size=1
color=black face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:black'><a href="bbishop@pathfinderengineers.com">bbishop@pathfinderengineers.com</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
3.0pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:black'>www.pathfinderengineers.com</span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=5 color=green face=Webdings><span
style='font-size:18.0pt;font-family:Webdings;color:green'>P</span></font><font
color=green><span style='color:green'> </span></font><font size=1 color=green><span
style='font-size:7.5pt;color:green'>Please strive to live sustainably.</span></font><font
color=green><span style='color:green'><o:p></o:p></span></font></p>
</div>
<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 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'> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Vikram Sami<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 15, 2009 4:30
PM<br>
<b><span style='font-weight:bold'>To:</span></b> Lam, Linda;
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] PSZ-HP
High heating unmet load hours</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="#0025c4" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#0025C4'>You might want to
look at your night cycle fan control:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#0025c4" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#0025C4'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><font
size=2 face="Times New Roman"><span style='font-size:10.0pt;font-weight:bold'>NIGHT-CYCLE-CTRL<o:p></o:p></span></font></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Takes a code-word
that specifies whether the fans will cycle on at night or on weekends (implied
by a 0 in FAN-SCHEDULE) to maintain the temperature setpoint. The fans are off
when the hourly values in the schedule that is referenced by FAN-SCHEDULE are
equal to 0. If the hourly schedule values are positive, the fans are on and if
the hourly schedule values are negative, the fans are not permitted to be on
under any circumstances. NIGHT-CYCLE-CTRL also cycles fans on when the
temperature goes above the throttling range of the ZONE:COOL-TEMP-SCH. To lock
out this feature you must input a -1 in the FAN-SCHEDULE for the summer
(cooling) period. NIGHT-CYCLE-CTRL only affects the fan operation. Once the
fans have cycled on, the availability of heating or cooling is controlled by
HEATING-SCHEDULE and COOLING-SCHEDULE. Allowed values of NIGHT-CYCLE-CTRL are:<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>STAY-OFF
The fans stay off regardless of conditions.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>CYCLE-ON-ANY
The fans are
cycled on for the hour if the temperature of any zone in the system falls below
the throttling range for heating, <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>CYCLE-ON-FIRST
The fans are cycled on for the hour
if the temperature in the system's control zone falls below the throttling
range for heating.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>ZONE-FANS-ONLY
For a PIU system, the main or central
system PIU fan will remain off but the individual zone terminal fans will cycle
on separately to satisfy the heating setback temperature for each zone.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#0025c4" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#0025C4'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#0025c4" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#0025C4'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#0025c4" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#0025C4'>The default is to
stay off. It sound like in your situation you want it to cycle on any. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#0025c4" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#0025C4'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><font
size=3 color=black face=Garamond><span style='font-size:12.0pt;font-family:
Garamond;color:black;font-weight:bold'>Vikram Sami,</span></font></b><font
color="#0025c4"><span style='color:#0025C4'> </span></font><font color=black
face=Garamond><span style='font-family:Garamond;color:black'>LEED AP</span></font><font
color="#0025c4"><span style='color:#0025C4'> <br>
</span></font><font color=black face=Garamond><span style='font-family:Garamond;
color:black'>Direct Phone 404-253-1466 | Direct Fax 404-253-1366</span></font><font
color="#0025c4"><span style='color:#0025C4'> <o:p></o:p></span></font></p>
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A</span></font></b><b><font size=2 color=maroon face=Garamond><span
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size=2 color=maroon face=Garamond><span style='font-size:10.0pt;font-family:
Garamond;color:maroon;font-weight:bold'>RCHITECTURE</span></font><font
color="#0025c4"><span style='color:#0025C4'><br>
</span></font></b><font size=2 color="#0025c4" face=Garamond><span
style='font-size:10.0pt;font-family:Garamond;color:#0025C4'>1201 Peachtree Street
NE, Suite 300, Atlanta, GA 30361</span></font><font color="#0025c4"><span
style='color:#0025C4'> <br>
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<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>Lam, Linda<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, June 15, 2009 3:09
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] PSZ-HP
High heating unmet load hours<o:p></o:p></span></font></p>
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<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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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Equest Users:</span></font><o:p></o:p></p>
</div>
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<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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<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I'm modeling a single story building with 2 packaged rooftop
HP units in <st1:City w:st="on"><st1:place w:st="on">Las Vegas</st1:place></st1:City>.
I have allowed the program to autosize airflow and cooling and heating
capacities.</span></font><o:p></o:p></p>
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<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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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I'm guessing that the high amount of underheated hours is due
to the fact that the PSZ system type uses only one of its assigned zones
as the control for constant volume airflow. I have designated the
control zone as the zone with the highest internal loads. This
works OK in cooling mode, though, I still have about 400 undercooled
hours. But in heating mode, the zone with the highest internal loads
does not need as much heat as the other zones. Since it's a constant
volume system and the control zone is saying "no heat needed", the rest
of the zones are not getting any heat. Is that right??</span></font><o:p></o:p></p>
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<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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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Following through with the assumption above, I tried to
increase the minimum cfm/sqft on zone level to 0.5, but my underheated hours
went up.</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I only manage to decrease unmet
heating hours after I increase the cfm on the system level
to about 5 times what Trane sizes. </span></font><o:p></o:p></p>
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<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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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Can someone help me out here?</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank you!!</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Linda</span></font><o:p></o:p></p>
</div>
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<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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