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<p class=MsoNormal>I’m modeling a building for LEED EAc1 compliance, and
was wondering how you are supposed to model existing building HVAC systems if
you are adding square footage to the building.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Let’s assume you have a 4-story building with a
2-chiller HVAC plant and dual temp boxes. If you were to add a 5<sup>th</sup>
floor to the building, what would your baseline model look like? I know
that the 1<sup>st</sup> four floors would use the existing HVAC system, but
would your new 5<sup>th</sup> floor be treated as a new 15,000 square foot area
with packaged RTUs, or would you add a new chiller to the existing HVAC chilled
water plant, and have that chiller meet all the requirements of App G, and have
shutoff VAV boxes for the 5<sup>th</sup> floor in lieu of dual temp boxes? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>For reference, under our proposed design, we are doing just
that: adding a frictionless chiller to the plant to make up the extra
load.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial","sans-serif";
color:teal'>GHT Limited<br>
</span></b><b><span style='font-family:"Arial","sans-serif"'><ns0:PersonName><span
style='color:black'>James Hansen</span></ns0:PersonName></span></b><b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:black'>,
PE, LEED AP<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Senior Associate</span></b><b><span style='font-size:12.0pt;
font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:Street><ns0:address><span
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style='color:black'>Arlington</span></ns0:City><span style='color:black'>, </span><ns0:State><span
style='color:black'>VA</span></ns0:State><span style='color:black'> </span><ns0:PostalCode><span
style='color:black'>22201-4749</span></ns0:PostalCode></ns0:place></span><span
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