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<DIV><FONT face=Arial size=2><SPAN class=598395115-15112005>Hello
everybody,</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=598395115-15112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=598395115-15112005>I am modeling a
3-story building mixed-used LEED building. The first floor is used as
classrooms and retails. The 2nd and 3rd floors are used for residential units.
Most of the systems on the first floor are air-cooled condensing unit
with electric heat-pump heating, and the rest are exhaust fan
systems. For the 2nd and 3rd floors, the apartment units use unit
heaters without any cooling. Corridors on these floors are
served by make-up air units with gas-fired heating. There is not any warning or
error when I simulate the model. </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=598395115-15112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=598395115-15112005>The problem is that
I can't reduce the "percent of hours any system zone outside of throttling
range" to an acceptable value. I have tried adjusting air flow,
throttling range, etc w/o achieving the desired results. I looked at SS-O
report and the problem is there are too many hours when the cooling
isn't satisfied for 2nd and 3rd floor. In other words, for all zones
on 2nd and 3rd floors there are many hours when the units are
over 80 - 85F or even above 85F. I also tweaked the fans night control
cycle, infiltration schedule, set-point temperature, and zone entering max
supple temp but the out of throttling range is still exceptionally
high. </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=598395115-15112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=598395115-15112005>I have no
idea how to fix this error. Without cooling in these units, should I not
expect such large out of throttling range issues? Has anyone encountered this
kind of problem before? Can anyone share their experience or
solution? Has anyone done LEED model w/o cooling? I would
appreciate any response, idea or hints that would help solve this
problem. I have described the problem as clear as I can but I am sure
there are things that I may have left out, please don't hesitate to ask me.
Again, I am trying to get some ideas, hints or methods so I will provide as much
info as anyone want in order to help me solve this.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=598395115-15112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=598395115-15112005>Thank you very
much in advance for your help. I appreciate any help, hints or
suggestions. Thank you again. </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=598395115-15112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=598395115-15112005>Sincerely, </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=598395115-15112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=598395115-15112005>Albert Sitorus. </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=598395115-15112005></SPAN></FONT> </DIV><FONT face=Arial
size=2></FONT><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT><FONT
face=Arial size=2></FONT><BR><BR><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN><STRONG>Albert T.
Sitorus</STRONG><BR><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><FONT
face="Times New Roman" size=3>Energy Analyst</FONT></SPAN></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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Washington, Suite 200</SPAN><BR><SPAN
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