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<DIV><SPAN class=968082418-09102007><FONT face=Arial size=2>I am looking for
some <SPAN
class=937410020-09102007>un-official </SPAN>opinions <SPAN
class=937410020-09102007>on an interpretation of </SPAN>Appendix <SPAN
class=937410020-09102007> G </SPAN>. </FONT></SPAN></DIV>
<DIV><SPAN class=968082418-09102007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968082418-09102007><FONT face=Arial size=2>I am modeling a
university stadium facility and the as-designed systems serving the locker
room areas are constant volume reheat with heat recovery. The
intent is that these systems will run continuously for moisture and
odor control.</FONT></SPAN></DIV>
<DIV><SPAN class=968082418-09102007><FONT size=+0></FONT></SPAN><FONT
face=Arial><FONT size=2></FONT></FONT> </DIV>
<DIV><FONT size=2><FONT face=Arial>P<SPAN class=968082418-09102007>roblem #1
</SPAN><SPAN class=968082418-09102007><FONT size=+0><FONT size=2>: Based
on the CFA, # of FLRs, and <SPAN class=937410020-09102007><FONT
color=#0000ff><FONT color=#000000>HT Type</FONT></FONT></SPAN> the baseline
system is System 7 VAV with Reheat. However G3.1.2.5 states that
the minimum ventilation would need to match the as-designed systems which
in this case would be 100% design airflow. Does the baseline in
this case become constant volume because I have to maintain the same
ventilation in both models?<SPAN class=937410020-09102007><FONT
color=#0000ff> </FONT>Or does minimum outside air ventilation
refer to whatever is required by individual State code regardless of the
as-designed case? </SPAN><SPAN
class=937410020-09102007> </SPAN></FONT> </FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN class=968082418-09102007><SPAN
class=968082418-09102007></SPAN></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=968082418-09102007><SPAN
class=968082418-09102007><SPAN class=968082418-09102007>My opinion is that<SPAN
class=937410020-09102007> t</SPAN>he decision to use 100% constant volume
outside air <SPAN class=937410020-09102007>is a</SPAN> design
decision rather than a code/standard mandatory requirement.<SPAN
class=937410020-09102007><FONT color=#0000ff><FONT color=#000000> In
this case minimum ventilation for locker rooms is 0.5 cfm/sq.ft dedicated
exhaust.</FONT> </FONT></SPAN> The additional energy associated
with <SPAN class=937410020-09102007>providing constant 100% OA greater
than 0.5 CFM/sq.ft. </SPAN>should not be included in the Appendix G
baseline, <SPAN class=937410020-09102007><FONT color=#0000ff> <FONT
color=#000000>but rather</FONT> </FONT></SPAN>the baseline should meet the
minimum ventilation requirements of <SPAN
class=937410020-09102007>the </SPAN>local state code.
</SPAN></SPAN></SPAN></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968082418-09102007></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968082418-09102007></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=968082418-09102007>Problem #2: How do I
resolve the fact that the system will be operated continuously even though the
space isn't occupied? Appendix G says systems shall run continuously during
occupied periods and intermittently during unoccupied periods. <SPAN
class=937410020-09102007><FONT color=#0000ff> </FONT><FONT
color=#000000>The locker rooms have low occupancy and therefore i</FONT></SPAN>f
I only model the systems operating during occupied periods the annual building
energy cost will be significantly lower than reality and the aggregate
effect of other energy efficiency measures will be much greater (ie: the % cost
savings for LEED will be much higher<FONT color=#0000ff><SPAN
class=937410020-09102007> <FONT
color=#000000>) </FONT></SPAN></FONT><FONT color=#000000><SPAN
class=937410020-09102007>because the locker rooms only account for 20% of
the total conditioned floor area but 40-50% of total energy
cost</SPAN>). </FONT></SPAN></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968082418-09102007></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN class=968082418-09102007>Again I am
going to argue that operating the systems continuously is a design
decision and not a code/standard regulated requirement. The
additional energy associated with continuously operating the
systems should be considered "process" energy and included in the
baseline. </SPAN></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968082418-09102007></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN class=968082418-09102007>What does
everyone think? </SPAN></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968082418-09102007></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN class=968082418-09102007>Thanks in
advance for your comments.</SPAN></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968082418-09102007></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT size=2><SPAN
class=968082418-09102007></SPAN></FONT></FONT><SPAN
class=968082418-09102007><FONT face="Arial Black"></FONT></SPAN> </DIV>
<DIV align=left><FONT face="Arial Black" size=2>Michael Tillou, PE,
LEED</FONT></DIV>
<DIV align=left><FONT face="Arial Black" size=2>Tillou Engineering,
LLC</FONT></DIV>
<DIV align=left><FONT face="Arial Black" size=1>Williamstown, MA
01267</FONT></DIV>
<DIV align=left><FONT face="Arial Black" size=1>P:
413-458-9870</FONT> <FONT face="Arial Black" size=1>C:
413-652-1087</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV><PRE>
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