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<p class=MsoNormal><span style='color:#1F497D'>Sounds like you're using a fan
coils with a make-up air unit. The heating and cooling setpoints entered at
the system level is for tempering the make-up air only. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The reason for the unmet hours
is likely that your terminal airflow is not large enough. The air will only be
heated to a maximum supply temperature (43°C?) so you can't get the output unless
terminal airflow is also increased.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><span style='color:#1F497D'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Kyle<o:p></o:p></span></p>
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Katherine
Louman-Gardiner<br>
<b>Sent:</b> Thursday, January 06, 2011 12:10 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] EE4 - Heat Pumps<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi,<o:p></o:p></p>
<p class=MsoNormal>Has anyone used EE4 before? It’s a Canadian
compliance software program. <o:p></o:p></p>
<p class=MsoNormal>I’ve modeled a Combination Ground Source Heat Pump and
Parallel boiler, but the program requires that “the heating airflow
temperature must always be lower than the cooling airflow
temperature.” Of course, with my heating setpoint at 60F, and my
cooling at 65F, I’ve got hundreds of unmet hours. I’ve put the
zone heating capacities at unrealistically high values to try to make up the
heat, but that’s not working either. <o:p></o:p></p>
<p class=MsoNormal>Has anyone encountered this problem before, or know why this
constraint is in place? <o:p></o:p></p>
<p class=MsoNormal>Thank you,<o:p></o:p></p>
<p class=MsoNormal>Katherine<o:p></o:p></p>
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