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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am trying to build an energy model for an office building
that uses a chilled beam HVAC system. In this system, there is a main
central air handler with heating and cooling coils to condition the air to 55
F. The supply air to each zone is then further conditioned to meet the
individual zone thermostats via a 2 pipe active chilled beam with heating and
cooling coils. Cooling is supplied through a chilled water loop tied to a
ground source heat exchanger and heating is supplied through a HW loop from the
boilers. Unfortunately, eQuest does not have a chilled beam HVAC system type.
So, I am trying to model the system with 2-pipe induction units. I know
these active chilled beams are more efficient than a standard VAV with reheat
system. However, to get a better idea of how “much”
more efficient the active chilled beams are, I built a model with a VAV system
and compared the results. Everything in the models is the same, except
for the HVAC system type (either induction unit or VAV) and I had to enter the
reheat delta T on the VAV system for it to work correctly. Finally the
results…drum roll please…<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><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The induction unit model used far more energy than the VAV
system. For whatever reason, the heating energy required in the induction
unit model is more than 3X that needed in the VAV model. I can not make
sense out of this.<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><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Does anybody have a clue what could be going on? Is
the induction unit really the closest eQuest can get to active chilled
beams? Thank you all for your help and time. Your knowledge is
greatly appreciated!<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><strong><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Josh Doherty</span></font></b></strong><o:p></o:p></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>
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12.0pt'><o:p> </o:p></span></font></p>
<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=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span><o:p></o:p></font></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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