[bldg-sim] ... pc's

[Denis Bourgeois]

In response to a recent question on PC power management ...

An interesting field study was done at LBNL on the topic ...

Roberson JA, Horman GK, Mahajan A, Nordman B, Webber CA, Brown RE, McWhinney M
and Koomey JG (2002) "Energy use and power levels in new monitors and personal
computers" LBNL-48581, Energy Analysis Department, Environmental Energy
Technologies Division, Ernest Orlando Berkeley National Laboratory, University
of California, 32 pages.

You can dowload the report here:

http://enduse.lbl.gov/Info/48581-abstract.html

Hope this helps, D

---

On March 16, 2004 12:45 pm, you wrote:
> 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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