[TRNSYS-users] urgent: PC gain!

Sat Jan 29 05:19:25 PST 2005

MessaggioDear all,

A brief summary on LCD vs CRT output can be found here: http://www.eu-energystar.org/en/en_023.htm

One interesting study from LBNL: http://repositories.cdlib.org/lbnl/LBNL-50508/
You'll find stuff on LCDs vs CRTs.

Hope this helps,

Denis Bourgeois
École d'architecture, Université Laval
(418) 686-0695 ou
(418) 656-2131, poste 7489 (local 1206)
denis.bourgeois at arc.ulaval.ca
  ----- Original Message ----- 
  From: Hilde Breesch 
  To: Pietro Filippi ; trnsys-users at engr.wisc.edu 
  Sent: Friday, January 28, 2005 7:43 AM
  Subject: Re: [TRNSYS-users] urgent: PC gain!

  Dear Pietro,

  Most of the time I use the measured data for computers, monitors, printers and photocopiers from Wilkins and Hosni , published in ASHRAE journal 42 (6), 2000 (in attachment). But I don't know if they have measured LCD monitors.

  best regards,

  Hilde Breesch
  PhD student Buildings & Climatic Control
  Department of Architecture & Urban Planning
  Ghent University
  J. Plateaustraat 22, B-9000 GENT
  tel. +32 9 264 78 61  fax. +32 9 264 41 85
  e-mail: Hilde.Breesch at UGent.be
  http://allserv.ugent.be/~hbreesch/research

    ----- Original Message ----- 
    From: Pietro Filippi 
    To: trnsys-users at engr.wisc.edu 
    Cc: esp-r at strath.ac.uk 
    Sent: Friday, January 28, 2005 1:00 PM
    Subject: [TRNSYS-users] urgent: PC gain!

    hi to all!
    I urgently need to know what internal gain assign for PC. We know new computers are much more powerful (as processor) and new LCD monitors "sucks" few electricity.

    En example (from tech data on their back):
    traditional monitor: 220V x 2.5A = 625We
    LCD monitor: 220V x 1.5A = 330We (but a shop catalogue gives 40-50W power consumption for a similar LCD!..).

    (an LCD is approximately 50% saving...right? but if I touch a traditional monitor I feel it is actually pretty warm while the LCD one is at ambient temperature! It would seem less than -50% consuming (as thermal gain I mean...). And in any case the electricity charge it is not totally dissipated in heat...)

    ...so can anybody tell me an average reasonable thermal dissipation? for LCD monitor and PC?

    thanks in advance
    Pietro

    PS
    well, according to the following report found on internet (from CERN in Switzerland)
    https://webh01.cern.ch/it-support-mrp/B513_Upgrade/reviewoct2002/pc_power_consumption.doc

    but getting the total consumption and dissipation from it is not clear...

    PC power consumption

    Bernd Panzer-Steindel, CERN/IT/ADC

    30.07.2002

      a.. Power supply efficiency is about 70 % ==    70 W effective power needs 100 W input power

      a.. Mainboard + power supply + harddisk under load consume on a dual cpu board
                (PIII 1 GHz) up to 100 W more (variation of up to 30 % depended on the motherboard  

                and power supply) 

      a.. The latest dual cpu Itanium 2 box from HP requires  about 700 Watts of input power

      a.. Ratio of SpecInt95 versus SpecInt2000 is about 0.1       1 SpecInt95 = 10 SpecInt2000

      a.. Disk power consumption is about 10 W at idle time and 30 W at startup  (120 GB EIDE disk)

      a.. Estimated needs for LHC computing in 2007 is    2.3 million  SpecInt95 and 3100 TB
    à   at a ratio of  10 SpecInt2000 / Watt   ==  2.3 MW power for the CPU server

    à   with 1 TB disks at 30 W                     ==  0.1 MW

           but scaling not yet really checked       current   GB/W curve

      a.. PIII   Northwood (0.18 um)  256 KB L2                          == 28 million transistors
                PIII   Willamette (0.13 um)  256 KB L2                          == 28 million transistors

                PIV   (0.18 um)  256 KB L2                                             ==  42 million transistors

                PIV   (0.13 um)  512 KB L2                                             ==  55 million transistors

                Itanium 2  Mcinley (0.18 um) 256 KB L2 + 3 MB L3     ==  220 million transistors

                Itanium 2  Maddison (0.13 um) 256 KB L2 + 6 MB L3   ==  500 million transistors

                (L3 on chip !) à power

    Ing. Pietro Filippi
    Nier Ingegneria SpA
    www.niering.it
    Via Altabella 3, 40126 Bologna
    tel: +39 051234359
    fax: +39 051239530

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