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<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>Hello
everyone:</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>I'm modeling a
400,000 sf hospital with 100% outside air and constant volume reheat system. The
priority is infection control and not energy savings, so the total ventilation
load is HUGE. </SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006></SPAN></FONT><FONT
face=Arial size=2><SPAN class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>Here's my question.
I've input all the CFM values for each supply air handler (about 500,000
cfm combined), but -- strictly speaking -- there is no return air since all air
is exhausted. So, how do I account for the kWh of all the exhaust air handlers?
The exhaust air handlers run about 2/3 the CFM of the supply air, with the
difference made up by exfiltration and a multitude of special-purpose exhaust
fans (in the labs and so on).</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>I figure my only
real option is to treat the exhaust air handlers as electric loads in the
building. They don't contribute to the heating and cooling loads, but they are a
significant energy use.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>Can you think of an
alternate way to model exhaust air fans to account for their energy use while
eliminating any energy use for return fans?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006>...Tom</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><STRONG>Thomas J.
White, P.E.</STRONG></SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><BR></SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Associate</SPAN></SPAN></DIV>
<DIV><SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Lead Engineer,
Energy Services</SPAN></SPAN></DIV>
<DIV><SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">LEED<SUP>®</SUP> Accredited
Professional</SPAN></SPAN></SPAN></SPAN></SPAN></DIV>
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