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

[Michael Wilson]

grab bag--boiler part load, waterside economizers and fan coils, and
efficient monitors and pcsRe: 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.

Michael Wilson, P.Eng.
Enerficiency Consulting
119 Head Rd.
Gibsons, BC, V0N 1V3
604-886-9864 phone
604-676-2604 fax (Vancouver local #)
mwilson at enerficiency.ca

  -----Original Message-----
  From: postman at gard.com [mailto:postman at gard.com]On Behalf Of Brian
Thornton
  Sent: March 16, 2004 8:51 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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