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

["Michael Wilson" <mwilson@xxxxxxxxxxxxxxx>]

Title: grab bag--boiler part load, waterside economizers and fan coils, and efficient monitors and pcs

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.

 

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

-----Original Message-----
From: postman@xxxxxxxx [mailto:postman@xxxxxxxx]On Behalf Of Brian Thornton
Sent: March 16, 2004 8:51 AM
To: bldg-sim@xxxxxxxx
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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