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<p class=MsoNormal><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'>Varkie, what we typically do is calculate
the projected temperature profiles using the ESHG method, then insert the
return temperature from the ESHG calc as the space operating temperature. This
way the underfloor supply CFM is only for the load it ‘sees’. Look at the
system pressure drops carefully and amend the fan pressure accordingly. Make
sure the systems have perimeter heating. Depending upon your location you are
right in checking the AHU to see if it dehumidifies the supply and doesn’t simply
provide air at 63F. Another way we check this is to run the same model but this
time with 55F and the same delta T as the underfloor model, checking the latent
loads between these models will give an indication of the dehumidification been
carried in the model.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'>Good luck.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 color=red face=Arial><span style='font-size:
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color:gray'> Oaks, CA 91423<br>
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<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-sim@gard.com [mailto:bldg-sim@gard.com] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Varkie Thomas<br>
<b><span style='font-weight:bold'>Sent:</span></b> Saturday, December 09, 2006
12:23 PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@gard.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [bldg-sim] Modeling UFAD</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Are there any examples of modeling UFAD with DOE2.1E
(or EQUEST).<o:p></o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>This is a commercial project with electric heating in
climate zone 3A. The baseline System No. is 8 - VAV w/PFP
Boxes). The proposed is also PIU (DOE2). The perimeter zones up to
3 ft are served from the ceiling. <o:p></o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>The remaining interior zones have UFAD. The CHW
coil leaving temp of the primary air is 48F. The UFAD supply temp is 65
F. The ceiling return air temp is 78. The System MIN-SUPPLY-T = 65
and COOL-SET-T = 48. ZONE-FAN-RATIO = 1.74 ?? 80%
glass.<o:p></o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>The Baseline primary air is 53F and ceiling supply is
55F. The ceiling return air temp is 76. System MIN-SUPPLY-T = 55
and COOL-SET-T = 53. ZONE-FAN-RATIO = 1.1. 40% glass.<o:p></o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Is all this correct? Increasing the ZFR
increases the Fan energy. Increasing the MIN-SUPPLY-T from 55F to 65F
increased the System Supply Air and Fan energy considerably.<o:p></o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>For UFAD is it acceptable to assume the following
space volume temps?<o:p></o:p></span></font></p>
<p class=MsoPlainText style='mso-margin-top-alt:0in;margin-right:0in;
margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt'><font size=3
color=red face=Times><span style='font-size:12.0pt;font-family:Times;
color:red'>$ Baseline Summer & Winter Space Volume Temp = 75 $</span></font><o:p></o:p></p>
<p class=MsoPlainText style='mso-margin-top-alt:0in;margin-right:0in;
margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'> </span></font><font
color=red face=Times><span style='font-family:Times;color:red'><o:p></o:p></span></font></p>
<p class=MsoPlainText style='mso-margin-top-alt:0in;margin-right:0in;
margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt'><font size=3
color=red face=Times><span style='font-size:12.0pt;font-family:Times;
color:red'>$ UFAD: 75F from 0' to 7' 85F from 7.1' to 10' Avg Summer Space Temp
= 78F $<o:p></o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 color=red face=Times><span
style='font-size:12.0pt;font-family:Times;color:red'>$ UFAD: 75F from 0'
to 7' 65F from 7.1' to 10' Avg Winter Space Temp = 72F $</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black'>STD62.1-2004
Table 6-2 ‘<span style='letter-spacing:.3pt'>Zone Air Distribution Effectiveness
(Ez)’ shows<o:p></o:p></span></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black;letter-spacing:
.3pt'>Ez = 1.0 for Ceiling Supply of Cool Air<o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 color=black
face="Times New Roman"><span style='font-size:12.0pt;color:black;letter-spacing:
.3pt'>Ez = 1.2 for </span><span style='letter-spacing:.1pt'>Floor Supply of
Cool Air and Ceiling Return.<o:p></o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black;letter-spacing:.1pt'>How would you apply
this in DOE2.1E for Under-floor Air Distribution?</span></font><font size=2
color=black face=Times><span style='font-size:10.0pt;font-family:Times;
color:black'><o:p></o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black;letter-spacing:.1pt'>How is occupancy based
lighting modeled? Based on 10CFR435 Table 401.3.3. Lighting
Schedule = Max Design Lighting * Base Lighting Schedule * 0.7 ?</span></font><font
size=2 color=black face=Times><span style='font-size:10.0pt;font-family:Times;
color:black'><o:p></o:p></span></font></p>
<p style='margin-left:.5in'><font size=3 color=black face="Times New Roman"><span
style='font-size:12.0pt;color:black;letter-spacing:.1pt'>How is occupancy based
ventilation modeled? Percent Outdoor Air for Hour = Maximum Design Percent
Outdoor Air * Occupancy Schedule Fraction. Apply this schedule in MIN-AIR-SCH
?</span></font><o:p></o:p></p>
<p style='margin-left:.5in'><font size=3 color=black face=Times><span
style='font-size:12.0pt;font-family:Times;color:black'>V.C. Thomas</span></font><o:p></o:p></p>
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