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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>In Appendix G of ASHRAE 90.1-2004, the baseline HVAC system
type specified by Table G3.1.1 for small buildings is a packaged single zone
system with direct expansion cooling. If heating is electric, then an
electric heat pump is also specified. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>For systems under 65,000 BTU/H, Table 6.1B of the standard
lists 12.0 SEER for unitary air cooled systems in a cooling mode and 7.4 HSPF
for these systems in a heat pump heating mode. Both SEER and HSPF are
seasonal efficiency values that are based on certain assumptions that may not
match the operation of an actual building.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Does anyone know how to translate these seasonal efficiencies
into a point-in-time efficiency that is meaningful to an hourly energy
simulation? Or is there some other accepted way to handle the problem?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks,<o:p></o:p></span></font></p>
<p><font size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'>Doug
Maddox, PE</span></font><o:p></o:p></p>
<p><font size=2 face="BankGothic Md BT"><span style='font-size:11.0pt;
font-family:"BankGothic Md BT"'>THE WEIDT GROUP</span></font><br>
<img width=32 height=40 id="_x0000_i1036"
src="cid:image001.gif@01C843C5.EF2DE5C0" alt="The Weidt Group" align=baseline
border=0> <br>
<st1:Street w:st="on"><st1:address w:st="on"><font size=1 face=Arial><span
style='font-size:9.0pt;font-family:Arial'>5800 Baker Road</span></font></st1:address></st1:Street><br>
<st1:place w:st="on"><st1:City w:st="on"><font size=1 face=Arial><span
style='font-size:9.0pt;font-family:Arial'>Minnetonka</span></font></st1:City><font
size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'>, <st1:State
w:st="on">MN</st1:State> <st1:PostalCode w:st="on">55345</st1:PostalCode></span></font></st1:place><br>
<font size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'>T
802-262-1033<br>
F 952.938.1480<br>
<a href="http://www.twgi.com">www.twgi.com</a><br>
<a href="mailto:DougM@twgi.com">DougM@twgi.com</a></span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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