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<DIV><SPAN class=375500022-16032004><FONT face=Arial color=#0000ff size=2>Re:
Question 1. I don't think the default curve has much value at all. It gives an
input of 8.25% at no load, which would be for jacket and off cycle stack losses.
If boilers were really this inefficient you'd see it in summer gas bills.
However, it gets offset by the default boiler operation in DOE2, which is
to turn the boiler off when it reaches no load, which is also inaccurate. I
think you need to develop new curves, and control the boilers as they actually
operate (ie. they cycle off but they don't turn off). But its really hard to
find useful information on boiler part load operation, as it relates to jacket
loss and off cycle stack loss. I'd be interested in anything you come up
with.</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<P><FONT size=2>Michael Wilson, P.Eng.<BR>Enerficiency Consulting<BR>119 Head
Rd.<BR>Gibsons, BC, V0N 1V3<BR>604-886-9864 phone<BR>604-676-2604 fax (Vancouver
local #)<BR>mwilson@enerficiency.ca</FONT> </P>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> postman@gard.com
[mailto:postman@gard.com]<B>On Behalf Of </B>Brian Thornton<BR><B>Sent:</B>
March 16, 2004 8:51 AM<BR><B>To:</B> bldg-sim@gard.com<BR><B>Subject:</B>
[bldg-sim] grab bag--boiler part load, waterside economizers and fan coils,
and efficient monitors and pcs<BR><BR></FONT></DIV>
<P><FONT face=Arial size=2>I've been saving up a few unrelated questions--any
thoughts:</FONT> </P>
<P><FONT face=Arial size=2>1) The default boiler part load curve in DOE 2
drops off substantially at minimum loads. My understanding is that this
is a reasonable reflection of cast iron sectional boiler </FONT></P>
<P><FONT face=Arial size=2>performance. (but not steel fire tube or
condensing) However, I haven't found a source to validate this. Does
anyone have information on real part load performance for code level
efficiency cast iron sectional boilers on the market today? </FONT></P>
<P><FONT face=Arial size=2>2) The ASHRAE 90.1 energy cost budget manual
requires budget baseline four-pipe fan coil systems to have waterside
economizers. The DOE 2.2 software doesn't appear to allow this with the
fan coil system type. Am I missing something in the code, or does anyone
have a work around or approximation?</FONT></P>
<P><FONT face=Arial size=2>3) I've heard various claims for energy savings for
flat screen monitors, and/or sleep-mode locally, or network controlled to
reduced W/s.f. for desktop computers, and more efficient PCs. It seems like
nearly all monitors now have a sleep mode of some sort. Any comments on
the baseline assumption for these features, and how much savings an energy
measure based on these ideas can reasonably produce? </FONT></P>
<P><FONT face=Arial size=2>Thanks</FONT> </P>
<P><FONT face=Arial size=2>Brian Thornton, P.E.</FONT> <BR><FONT face=Arial
size=2>Lead Engineer, Energy Services</FONT> <BR><U><B><I><FONT
face="Arial Black" color=#000000 size=5>GLUMAC</FONT></I></B></U> <BR><B><FONT
face=Arial color=#000000 size=1>I N T E R N A T I O N A L</FONT></B> <BR><FONT
face=Arial size=2>320 SW Washington, Suite 200</FONT> <BR><FONT face=Arial
size=2>Portland, Oregon 97204</FONT> </P>
<P><FONT face=Arial size=2>503.227.5280 Phone </FONT><BR><FONT
face=Arial size=2>503.274.7674 Fax</FONT> </P><BR><PRE>
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