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<div class=Section1>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>We’re
working on a building that has a large natatorium.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>The project is
located in Utah so we can use outside air for dehumidification. There is
no mechanical cooling in the as-designed system.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>Per Appendix G,
it appears that the baseline system should be a packaged single zone unit with
a fossil fuel furnace for heating, an air side economizer (dry bulb high limit
of 75 F), and DX cooling. We’re controlling the space temp at 88 F
and the relative humidity between 40-60%. The baseline system would run
as a constant volume unit with a minimum ventilation air requirement of 0.5
cfm/sf (~15,000 cfm). <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>The Appendix G
baseline system has a considerable dehumidification load – which shows up
as a cooling energy.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>The as designed
system is a heating only unit with an air side economizer and heat
recovery. The system uses outside air to dehumidify instead of a DX coil</span><span
style='font-size:10.0pt;color:#1F497D'> (Utah has a very dry climate)</span><span
style='font-size:10.0pt;color:#1F497D'>. Space conditions remain the
same. We’ve modeled this system by increasing the amount of
ventilation air delivered to the space until the relative humidity in the space
is between roughly 40 and 60%. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>The results
show a large electric fan penalty (due to the pressure drop across the heat
recovery), a large amount of heating savings (from the heat recovery), and a
large amount of cooling savings, since we’re now using OA, heat recovery
and natural gas to dehumidify the space instead of electricity.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>Is this a
reasonable approach per the Appendix G modeling methodology? It seems
unreasonable to us that we should be able to claim the cooling/dehumidification
savings, but per Appendix G this seems to be the case. I would welcome
any and all thoughts and feedback.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'>Thanks.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial Narrow","sans-serif";
color:#1F497D'>Greg Schlegel</span><span style='font-family:"Times New Roman","serif";
color:#1F497D'><br>
</span><i><span style='font-size:7.5pt;font-family:"Arial Narrow","sans-serif";
color:#1F497D'>Energy Analyst, PE, LEED-AP</span></i><span style='font-family:
"Times New Roman","serif";color:#1F497D'> <br>
</span><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:#1F497D'><img width=209 height=54 id="Picture_x0020_1"
src="cid:image002.jpg@01C9A89B.C51450D0" alt="cid:125410401@15112007-188C"><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Times New Roman","serif";
color:#1F497D'> </span><span style='font-size:7.5pt;font-family:"Times New Roman","serif";
color:#1F497D'>----------------------------------------------------------------------------------------</span><span
style='font-family:"Times New Roman","serif";color:#1F497D'><br>
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<p class=MsoNormal><o:p> </o:p></p>
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