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<DIV><FONT face=Arial size=2><SPAN class=210002822-06042006>Hi
all,</SPAN></FONT></DIV>
<DIV><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>
<DIV><FONT face=Arial size=2></FONT><FONT face=Arial size=2></FONT>
<DIV><FONT face=Arial size=2><SPAN class=858024315-05042006>I am modeling a
31-story high rise. This building uses VAV<SPAN class=210002822-06042006>
(reverse action thermostat type) </SPAN> and <SPAN
class=210002822-06042006>t</SPAN>wo-<SPAN
class=210002822-06042006>p</SPAN>ipe <SPAN
class=210002822-06042006>f</SPAN>an <SPAN
class=210002822-06042006>c</SPAN>oil <SPAN
class=210002822-06042006>u</SPAN>nits<SPAN class=210002822-06042006> (reverse
action thermostat type)</SPAN>.<SPAN class=210002822-06042006> I have tried
reversed action and proportional thermostat type but both gave me the same
results. </SPAN>It also has a DO<SPAN class=210002822-06042006>A</SPAN>S that
serves 26 floors with CFM ranging from 50 - 100 CFM. All systems
are assumed to be code values. The intention of this model is to
estimate cooling load during peak condition. I let all schedules to be the
default except for lighting and equipment schedules. These schedules are
set to be always on. </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=858024315-05042006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=858024315-05042006>I ran the model
and the result is 97% out of throttling range. I figured this is
because of the peak condition which the
systems can't meet the desired temperature set-points<SPAN
class=210002822-06042006> (heating 70 deg, cooling 75 deg, and 4 deg
throttling range for all systems)</SPAN>. I ran this model and got the hourly
data. It got more interesting. From SS-D report, I gathered that on Sept 5
@ 4pm is the peak condition for the building which is located in
Portland, OR. I pulled out hourly data for that day and plot them in
excel. The curve is nice and smooth with a couple of peaks and valleys at
the beginning of the day<SPAN class=210002822-06042006> with a distinguished
peak at 4pm</SPAN>. I also grabbed hourly data for
winter season. I picked 3 days ( Jan 3 is the lowest load from SS-D
report). For Jan 3rd, the curve is nice and smooth <SPAN
class=210002822-06042006>similar to </SPAN>Sept. 5th curve. But when I
graph Jan 6th and Jan 1st, the curves don't make sense. Both
curves behave as sinusoidal curves. They go up and down
every hour of the day. I don't understand them. Is this because of the model is
out <SPAN class=210002822-06042006>of</SPAN> throttling range? If so, why
on certain days and not all of them. </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=858024315-05042006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=858024315-05042006>Thank you very much
for your help and <SPAN class=210002822-06042006>suggestions in
advanced</SPAN>. I gladly appreciate them. </SPAN></FONT></DIV><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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<DIV></DIV><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">320 SW
Washington, Suite 200</SPAN><BR><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">Portland,
OR 97204-2640</SPAN><BR><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">T.
503.227.5280<SPAN style="mso-spacerun: yes"> </SPAN>F.
503.274.7674<BR><BR><STRONG><SPAN
style="FONT-SIZE: 10pt; COLOR: #333333; FONT-FAMILY: Arial">Thinking. Inside the
building.</SPAN></STRONG><BR><STRONG><SPAN
style="FONT-WEIGHT: normal; FONT-SIZE: 10pt; COLOR: #333333; FONT-FAMILY: Arial"><A
href="http://www.glumac.com/">www.glumac.com</A></SPAN></STRONG></SPAN>
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