[bldg-sim] grab bag--boiler part load, waterside economizers and fan coils, and efficient monitors and pcs

[Craig Gann]

Brian,
 
RE: question #3, see 2001 ASHRAE Fundamantals Handbook, Table 8, chapter 29.
They list small (13-15"), med. (16-18") and large (19-20") computer monitors
at 55 W, 70 W and 80 W, respectively while in continuous operation and 0 W
while in energy saver mode. These values are likely for CRTs, not LCDs,
which are much less. Probably best to consult computer manufacturer's data
then apply a load factor for usage. There may also be updated information
available from an ASHRAE RP since 2001.
 
Good luck!
 
Craig J. Gann, P. E.

-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com] On Behalf Of Brian Thornton
Sent: Tuesday, March 16, 2004 10:51 AM
To: bldg-sim at gard.com
Subject: [bldg-sim] grab bag--boiler part load, waterside economizers and
fan coils, and efficient monitors and pcs



I've been saving up a few unrelated questions--any thoughts: 

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 

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? 

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?

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? 

Thanks 

Brian Thornton, P.E. 
Lead Engineer, Energy Services 
GLUMAC 
I N T E R N A T I O N A L 
320 SW Washington, Suite 200 
Portland, Oregon 97204 

503.227.5280  Phone 
503.274.7674  Fax 




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