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<p class=MsoNormal><span style='color:black'>How many zones are there, and are
there the same number of single-zone AHUs in your base case? How are the
baseboards controlled?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>5,229 btu/sf/yr is pretty low for
heating, depending on your climate. The other figure may be high for an
office (again depending on climate) but looks to be the right order of
magnitude if there is significant cold weather.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>I would start with the SS-O
reports, and also compare the total number of unmet hours for both cases, to
verify that you are providing the same conditions for each alternative.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>That level of difference between
the alternatives sounds more like the first case has cooler than expected zones
rather than the result of a system type change (even to a multizone).<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>David<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>W. Peter
Anderson<br>
<b>Sent:</b> Wednesday, January 30, 2008 12:09 PM<br>
<b>To:</b> Building Model<br>
<b>Subject:</b> [Bldg-sim] RTUs with HW coils<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Greetings-</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
am preplxed by a dramtic increase in heating load for my building- 35000 sq ft
two story office.</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Base
case equipment is Packaged Single Zone DX, fixed outside air (15%). Base
board perimeter radiators to heat.</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The
Propsed Case is Packaged Multizone with HW heat. I added economizers, and
kept the same baseboard.</span><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><br>
The base case condtion used 183 MMBTU/year.<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The
revised model consumes 3338 MMBTU/year.<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Space
temperatures looked slightly different, but with in 2F-5F<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Any
thoughts? All things are identical expect the RTUs. I have checked
everything I could think off.<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Regards,<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>W.
Peter Anderson, P.E<br>
JP Engineering<br>
41 Mechanic Street<br>
Windsor, CT 06095<br>
Ph: 860/688-5223<br>
Fax: 860/688-5269</span><o:p></o:p></p>
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