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<DIV><FONT face=Arial>I am trying to model the following sequence of supply air
temperature vs. outside air drybulb temp. in PowerDOE.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial>1) Drybulb above 65F -> Supply temp fixed at 48 F with
mechanical cooling</FONT></DIV>
<DIV><FONT face=Arial>2) Drybulb between 48 and 65 F -> 100% OA, no cooling,
so supply temp varies between 48-65 (not including fan delta T,
etc)</FONT></DIV>
<DIV><FONT face=Arial>3) Drybulb below 48 F -> Supply temp fixed at 48 F with
economizer cooling only, OA dampers modulate to provide correct supply
temp.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial>The 65F setpoint may be lowered if room temps get too
high.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial>I have been able to specify reset control of the supply
temperature, but I think that this strategy will require at least two reset
schedules, or a combination of reset and correct specs in the OA economizer
section.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial>Any ideas?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial>Thanks.</FONT></DIV>
<DIV><FONT face=Arial><BR>Sincerely,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial>Alec Stevens<BR>DMI<BR>617-527-1525x105</FONT></DIV>
<DIV> </DIV><PRE>
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