| Bibliographic Citation | |
| Full Text |  6 Mb |
|---|---|
| Title | Measured energy savings and performance of power-managed personal computers and monitors |
| Creator/Author | Nordman, B. ; Piette, M.A. ; Kinney, K. |
| Publication Date | 1996 Aug 01 |
| OSTI Identifier | OSTI ID: 451182; Legacy ID: DE97003820 |
| Report Number(s) | LBL--38057; CONF-9608106--16 |
| DOE Contract Number | AC03-76SF00098 |
| Other Number(s) | Other: ON: DE97003820; TRN: TRN: 97:001995 |
| Resource Type | Conference |
| Resource Relation | Conference: 1996 American Council for an Energy-Efficieny Economy (ACEEE) summer study on energy efficiency in buildings, Pacific Grove, CA (United States), 25-31 Aug 1996; Other Information: PBD: Aug 1996 |
| Research Org | Lawrence Berkeley Lab., CA (United States) |
| Sponsoring Org | USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States) |
| Subject | 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION ;99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; PERSONAL COMPUTERS; ENERGY CONSERVATION; ENERGY CONSUMPTION; DISPLAY DEVICES |
| Description/Abstract | Personal computers and monitors are estimated to use 14 billion kWh/year of electricity, with power management potentially saving $600 million/year by the year 2000. The effort to capture these savings is lead by the US Environmental Protection Agency`s Energy Star program, which specifies a 30W maximum demand for the computer and for the monitor when in a {open_quote}sleep{close_quote} or idle mode. In this paper the authors discuss measured energy use and estimated savings for power-managed (Energy Star compliant) PCs and monitors. They collected electricity use measurements of six power-managed PCs and monitors in their office and five from two other research projects. The devices are diverse in machine type, use patterns, and context. The analysis method estimates the time spent in each system operating mode (off, low-, and full-power) and combines these with real power measurements to derive hours of use per mode, energy use, and energy savings. Three schedules are explored in the {open_quotes}As-operated,{close_quotes} {open_quotes}Standardized,{close_quotes} and `Maximum` savings estimates. Energy savings are established by comparing the measurements to a baseline with power management disabled. As-operated energy savings for the eleven PCs and monitors ranged from zero to 75 kWh/year. Under the standard operating schedule (on 20% of nights and weekends), the savings are about 200 kWh/year. An audit of power management features and configurations for several dozen Energy Star machines found only 11% of CPU`s fully enabled and about two thirds of monitors were successfully power managed. The highest priority for greater power management savings is to enable monitors, as opposed to CPU`s, since they are generally easier to configure, less likely to interfere with system operation, and have greater savings. The difficulties in properly configuring PCs and monitors is the largest current barrier to achieving the savings potential from power management. |
| Country of Publication | United States |
| Language | English |
| Format | Medium: ED; Size: 15 p. |
| Availability | OSTI as DE97003820 To purchase this media from NTIS, click here |
| System Entry Date | 2009 Nov 10 |
| Document Discussions | |
Top | |
Last Updated: 11/20/2009