Download ENERGY STAR Program Requirements for Computers (DRAFT

454
455
II. Workstations: Below is a sample PTEC calculation for a Workstation with 2 hard drives.
A) Measure values using the ENERGY STAR Computers Test Method: 456
1) Off Mode = 2 W 457
2) Sleep Mode = 4W 458
3) Idle State = 80W 459
4) Max Power = 180W 460
461
462
B) Note number of Hard Drives installed: 5) Two hard drives installed during test. C) Calculate PTEC from power measurements and weightings using Equation 3: Toff
0.35
Tsleep
0.10
Tidle
0.55
463
6) PTEC = (.35 * Poff + .10 * Psleep + .55 * Pidle) 464
7) PTEC = (.35 * 2 + .10 * 4 + .55 * 80) 465
8) PTEC = 45.10 W
466
D) Calculate the PMAX requirement using Equation 4: 467
9) PMAX = 0.28*[Pmax + (# HDD * 5)] 468
10) PMAX = 0.28*[180 + 2 * 5)] 469
11) PMAX = 53.2 470
471
472
E) Compare PTEC to the ENERGY STAR levels to determine if the model qualifies: 12) 45.10 < 53.2 G) Therefore, the Workstation meets ENERGY STAR requirements. ENERGY STAR Program Requirements for Computers – Eligibility Criteria
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