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<p class=MsoNormal>I am trying to model exhaust fans for a building and have
had a couple of issues regarding the EXHAUST-SOURCE input under the zone
Outside Air and Exhaust section. I have two RTU’s, one is a 100% OA
constant volume system with constant volume fume hood exhausts. The other
RTU is a VAV system with a couple exhaust fans. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Starting with the VAV system, when I input the EXHAUST-SOURCE
as Air Handler, my OSA Ventilation rate for the RTU is quite a bit more than
the sum of the individual OSA rates. I cannot figure this out. When
I change the EXHAUST-SOURCE to Balanced Infiltration my RTU ventilation rate
matches the sum of the zones, but my energy use goes up. Is there
something I am missing here?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>For the 100% OA CV system, if I model the EXHAUST-SOURCE as Balanced
Infiltration or Infiltration vs Air Handler my space heating energy rate over doubles.
This does not seem correct and makes me nervous to use the Balanced
Infiltration input for my VAV fans.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Has anyone run into this issue before? Is this a bug
or would these results be expected?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;
mso-height-rule:exactly'><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><img
width=252 height=97 id="Picture_x0020_1"
src="cid:image001.jpg@01CA4830.17C2E880" alt="154683_logo_final"></span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p>
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mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><span style='font-size:10.0pt;font-family:
"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:2.25pt;
mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><b><span style='font-size:12.0pt;font-family:
"Arial Narrow","sans-serif";color:#17365D'>Ryan Del Balso<o:p></o:p></span></b></p>
<p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:2.25pt;
mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><b><span style='font-size:12.0pt;font-family:
"Arial Narrow","sans-serif";color:#17365D'>Building Performance Engineer<o:p></o:p></span></b></p>
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mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><b><span style='font-size:12.0pt;font-family:
"Arial Narrow","sans-serif";color:#17365D'>ryan@ambient-e.com<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial Narrow","sans-serif";
color:#EEB500'>130 W. 5th Avenue, Denver, CO 80204 <o:p></o:p></span></b></p>
<p class=MsoNormal style='mso-element:frame;mso-element-frame-hspace:2.25pt;
mso-element-wrap:around;mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:
column;mso-height-rule:exactly'><b><span style='font-size:12.0pt;font-family:
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303.278.8533 |<o:p></o:p></span></b></p>
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column;mso-height-rule:exactly'><b><span style='font-size:12.0pt;font-family:
"Arial Narrow","sans-serif";color:#17365D'><a href="http://www.ambient-e.com/"><span
style='color:#17365D'>ambient-e.com</span></a><o:p></o:p></span></b></p>
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"Arial","sans-serif";color:black'><o:p> </o:p></span></b></p>
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