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<DIV><FONT face=Arial size=2>Hello All,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As part of a comprehensive energy study for a new
elementary school, we are analyzing fuel savings opportunities for a
proposed boiler with fully modulating burners as compared to a
base-case sectional lo-hi-lo boiler. So far, we have found that, all
things being equal, there are no significant savings associated with such a
measure (at least not for the boiler size and models we've been
considering).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>We use PowerDOE for most of our energy
simulations. In the course of this study, we have come to question the
default boiler part-load heat-input-ratio curve (</FONT><FONT face=Arial
size=2>HW-Blr-HIR-fPLR) found in Bdllib.dat. Until now, we have applied
this curve to most base-case boiler calculations (perhaps mistakenly?).
Does anyone know of the origins of this curve or what it would have been based
upon? Most manufacturers we have spoken with state that peak boiler
efficiency occurs between 25% and 50% load. Using the default
curve, peak performance occurs at full load and efficiency
decreases by nearly 10% at half load.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Also, if this curve is in error, can anyone suggest
a method for developing a more reasonable curve estimate?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks,</FONT></DIV>
<DIV><FONT face=Arial size=2>Wade</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Wade McLaughlin<BR>DMI<BR>450 Lexington
St.<BR>Newton, MA 02466<BR>p 617-527-1525 x103<BR>f
617-527-6606</FONT></DIV><PRE>
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