network pc management slides for rtf march 1, 2011
DESCRIPTION
3 Definitions Active State: computer performs useful work Idle State: operating system and other software have loaded, and machine is not asleep Sleep (Standby): low-power state after inactivity or by manual selection. Off Mode: Power consumption is at lowest level and cannot be switched off (influenced) by user Used in analysis: Active/idle state Sleep/off modeTRANSCRIPT
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Network PC ManagementSlides for RTF
March 1, 2011
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Overview• Metered 418 computers, total (used 362 in analysis)• Computer power, one-minute intervals, tower only (no
monitors)• Two to three weeks
Participant Desktops
Non-part Desktops
Participant Laptops
Non-part Laptops
Educational 110 56 6 1
Government 28 73 2 18
Commercial 24 23 5 16
Totals 162 152 13 35
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Definitions• Active State: computer performs useful work• Idle State: operating system and other software have
loaded, and machine is not asleep• Sleep (Standby): low-power state after inactivity or by
manual selection. • Off Mode: Power consumption is at lowest level and
cannot be switched off (influenced) by user
Used in analysis:• Active/idle state• Sleep/off mode
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Metering by Building Type
Commercial Education Government 0
1
2
3
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5
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Participant Buildings Non-Participant Buildings
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DESKTOP COMPUTERS
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Usage Groups - AllParticipant Desktops
Non-part Desktops Total
Administrative 19 48 67Computer Lab 56 46 102Drafting Lab 5 0 5Media Lab 9 0 9IT 5 2 7Advanced Office 4 6 10Standard Office 51 49 100Teacher 13 1 14Totals 162 152 314
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Usage Groups - SummaryUsage group
Commercial Educational Government
Non-part Part Non-part Part Non-partIT 0 0 0 0 2
Computer Lab 2 2 44 68 0
Office/Admin 21 22 12 42 71
Total 23 24 56 110 73
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Operating SystemParticipant Nonparticipant Total
Windows7 2 24 26Windows Server 2008* 8 8Windows XP 160 110 270Windows Vista 10 10
* These computers were in a computer lab at a community college
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Spot MeasurementsParticipantsn = 162
Min Power (W)
Max Power (W)
Mean Power (W)
Standby 0.8 9.0 3.9Off 0.0 8.7 2.3
Non-Participantsn = 152
Min Power (W)
Max Power (W)
Mean Power (W)
Standby 0.8 9.2 2.7Off 0.0 9.1 1.7
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Metered Active/Idle Power
Sample Group
Minimum Average Power
(W)
Maximum Average Power
(W)Mean Average
Power (W)Participant Desktop (n=162) 19.6 89.6 57.4
Nonparticipant Desktop (n=152) 19.7 146.1 63.2
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Active/Idle Distribution by Part/Non-part
>10-20
>20-30
>30-40
>40-50
>50-60
>60-70
>70-80
>80-90
>90-100
>100-110
>110-120
>120-130
>130-140
>140-150
>150-160
05
101520253035404550
Participants Nonparticipants
Power (Watts)
Num
ber
of C
ompu
ters
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Active/Idle Distribution by Sector
>10-20 >20-30 >30-40 >40-50 >50-60 >60-70 >70-80 >80-90 >90-100
>100-110
>110-120
>120-130
>130-140
>140-150
0
10
20
30
40
50
60
70
Commercial Educational Government
Power (Watts)
Num
ber
of C
ompu
ters
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Active/Idle State by Building Type - Weekdays
Commerc
ial Par
ticipa
nt
Commerc
ial Non
partic
ipant
Educat
ional
Partic
ipant
Educat
ional
Nonpar
ticipa
nt
Govern
ment P
articip
ant
Govern
ment N
onpar
ticipa
nt0%
10%20%30%40%50%60%70%80%90%
100%
Active/Idle Standby/Off
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Active Computer Usage by Building Type - Weekends
Commerc
ial Par
ticipa
nt
Commerc
ial Nonp
articip
ant
Educat
ional
Partic
ipant
Educat
ional
Nonpar
ticipa
nt
Govern
ment P
articip
ant
Govern
ment N
onpar
ticipa
nt0%
10%20%30%40%50%60%70%80%90%
100%
Active/Idle Standby/Off
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Load Shapes
0:000:030:060:090:120:150:180:210:240:270:300:330:360:390:420:450:480:510:540:571:001:031:061:091:121:151:181:211:241:271:301:331:361:391:421:451:481:511:541:572:002:032:062:092:122:152:182:212:242:272:302:332:362:392:422:452:482:512:542:573:003:033:063:093:123:153:183:213:243:273:303:333:363:393:423:453:483:513:543:574:004:034:064:094:124:154:184:214:244:274:304:334:364:394:424:454:484:514:544:575:005:035:065:095:125:155:185:215:245:275:305:335:365:395:425:455:485:515:545:576:006:036:066:096:126:156:186:216:246:276:306:336:366:396:426:456:486:516:546:577:007:037:067:097:127:157:187:217:247:277:307:337:367:397:427:457:487:517:547:578:008:038:068:098:128:158:188:218:248:278:308:338:368:398:428:458:488:518:548:579:009:039:069:099:129:159:189:219:249:279:309:339:369:399:429:459:489:519:549:5710:0010:0310:0610:0910:1210:1510:1810:2110:2410:2710:3010:3310:3610:3910:4210:4510:4810:5110:5410:5711:0011:0311:0611:0911:1211:1511:1811:2111:2411:2711:3011:3311:3611:3911:4211:4511:4811:5111:5411:5712:0012:0312:0612:0912:1212:1512:1812:2112:2412:2712:3012:3312:3612:3912:4212:4512:4812:5112:5412:5713:0013:0313:0613:0913:1213:1513:1813:2113:2413:2713:3013:3313:3613:3913:4213:4513:4813:5113:5413:5714:0014:0314:0614:0914:1214:1514:1814:2114:2414:2714:3014:3314:3614:3914:4214:4514:4814:5114:5414:5715:0015:0315:0615:0915:1215:1515:1815:2115:2415:2715:3015:3315:3615:3915:4215:4515:4815:5115:5415:5716:0016:0316:0616:0916:1216:1516:1816:2116:2416:2716:3016:3316:3616:3916:4216:4516:4816:5116:5416:5717:0017:0317:0617:0917:1217:1517:1817:2117:2417:2717:3017:3317:3617:3917:4217:4517:4817:5117:5417:5718:0018:0318:0618:0918:1218:1518:1818:2118:2418:2718:3018:3318:3618:3918:4218:4518:4818:5118:5418:5719:0019:0319:0619:0919:1219:1519:1819:2119:2419:2719:3019:3319:3619:3919:4219:4519:4819:5119:5419:5720:0020:0320:0620:0920:1220:1520:1820:2120:2420:2720:3020:3320:3620:3920:4220:4520:4820:5120:5420:5721:0021:0321:0621:0921:1221:1521:1821:2121:2421:2721:3021:3321:3621:3921:4221:4521:4821:5121:5421:5722:0022:0322:0622:0922:1222:1522:1822:2122:2422:2722:3022:3322:3622:3922:4222:4522:4822:5122:5422:5723:0023:0323:0623:0923:1223:1523:1823:2123:2423:2723:3023:3323:3623:3923:4223:4523:4823:5123:5423:570
10
20
30
40
50
60
Part_Desktop_Weekday Part_Desktop_Weekend NonPart_Desktop_Weekday NonPart_Desktop_WeekendTime
Pow
er (W
atts
)
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Percent in Standby/Off – Weekdays and Weekends
Time PeriodNonparticipant Desktops
(n=152)Participant Desktops
(n=162)8 a.m. – 6 p.m. weekdays 34% 44%
6 p.m. – 8 a.m. weekdays 53% 78%
Saturday and Sunday 55% 85%
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Hours by Mode
ModeAverage
Power (W)Non-part Share of Hours (conf/prec)
Participant Share of Hours (conf/prec)
OverallStandby/Off 2.0 45% (90/10) 64% (95/10)Active/Idle 60.2 55% (90/10) 36% (95/10)
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Desktop Savings OverallNon-Participant Energy (kWh) Participant Energy (kWh) Annual
Energy Savings (kWh)
n Weekday Weekend Weekly n Weekday Weekend WeeklyAll Desktops
152 4.69 1.28 5.97 162 3.34 0.57 3.91 117
Assumptions:• Computers not in use three weeks/year for vacation/sick + one week for
holidays = in use 48 weeks/year• RTF savings for monitors: 11 kWh• Total annual workstation savings: 117 + 11 = 128 kWh
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Desktop Savings by SectorNon-Participant Energy (kWh) Participant Energy (kWh)
Sector
n Weekday Weekend Weekly n Weekday Weekend Weekly
Annual Energy Savings (kWh)
Educational56 3.98 1.08 5.06 110 2.71 0.31 3.02 113
Government73 4.85 1.27 6.12 28 4.69 1.04 5.74 36
Commercial23 5.92 1.78 7.70 24 4.69 1.18 5.87 113
Only one government participant site; not aggressive in settings
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Comparison to Deemed SavingsThe RTF provisionally deemed savings for desktops were 148 kWh
per workstation (computer and monitor), with 131 kWh savings per computer and 18 kWh per monitor.
Our study found savings of 117 kWh per desktop computer.
When this was added to the RTF estimate for monitors, slightly lower savings of 135 kWh per workstation resulted.
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Measure Life• Years that a
participant keeps a desktop computer before replacing it
Response Frequency (n=22)
1-2 Years 03-4 Years 75+ Years 6As Needed 2Replace Rarely in Practice 2
No Response 5Total 22
Response Frequency (n=22)
1 year 52 years 1.53 years 6.55 Years 1Permanent 2Varies 2No Response 4Total 22
• Typical length of a software license.
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Questions?
Kathy HileAssociateThe Cadmus GroupTel: (503) [email protected]
Heidi OchsnerAssociateThe Cadmus GroupTel: (503) [email protected]
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LAPTOPS
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Average Power (n=35)
Metered Active/Idle Power
Minimum Power (W)
Maximum Power (W) Mean Power (W)
Nonparticipant Laptop 18.1 39.8 24.3
Spot Measurements Standby/Off Power
Min Power (W)
Max Power (W)
Average Power (W)
Standby 0.4 5.0 2.3
Off 1.0 5.0 1.4
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Average Active/Idle Power
0-10 >10-20 >20-30 >30-40 >40-50 >50-60 >60-700
5
10
15
20
25
Power (Watts)
Num
ber
of C
ompu
ters
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Percent in Standby/Off – Weekdays and WeekendsTime Period Nonparticipant Laptops (n=35)8 a.m. – 6 p.m. weekdays 36%6 p.m. – 8 a.m. weekdays 56%Saturday and Sunday 58%
Time Period
Nonparticipant Laptops (n=35)
Participant Desktops (n=162) Difference
Weekdays 48% 63% 15%Saturday and Sunday 58% 85% 27%
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Annual Energy Savings
Sample Group Weekday Weekend WeeklyAnnual Energy Usage
(kWh)
Nonparticipant Laptops 1.82 0.53 2.34 120
Participant Laptops (Estimated) 1.55 0.39 1.94 58
Annual Energy Savings 0.27 0.14 0.41 62
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Comparison to Deemed SavingsThe RTF estimated laptop savings at 64 kWh per computer.
We estimated laptop savings at 62 kWh per computer.