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Plug Load Control

Plug load control comes in two basic forms. Energy savings are achieved when the device is either transitioned to a low-power state, or it is de-energized to eliminate the power draw. Both can be executed either manually or automatically. A low-power state is between a de-energized state and a ready-to-use state. This includes standby, sleep, and hibernate modes as well as any “off” state that has a parasitic power draw. A de-energized state is when electricity is not being provided to the device. This is analogous to physically unplugging a device’s power cord from a standard electrical outlet.

The most prevalent plug load contral strategies include:


Manual Control: Most plug-loads can be manually powered down with built-in power buttons, shutdown procedures, or a control device that energizes and de-energizes electrical outlets based only on manual input. The effectiveness of manual control depends entirely on user behavior and should be implemented only if no other methods apply.


Automatic Low-Power State: The first, and in some cases most effective, control method is a built-in, automatic low-power state functionality such as standby or sleep. Some manufacturers include this functionality to reduce energy consumption of idle devices. Internal processes monitor idle time, and when the device has been in an idle state for a given period, it will power down to a low-power state.


Schedule Timer Control Device: Certain plug-loads have predictable load profiles. These devices are used during the same times each day or at regular intervals. A scheduling-control device can effectively manage a predictable plug-load. It applies user-programmed schedules to de-energize the plug-load to match its use pattern and energize the plug-load so that it is ready for use at the time when it is required.


Load-Sensing Control Device: Plug loads may have a primary-secondary relationship. A primary device, such as a computer, operates independently of other (slave) devices. A secondary device, such as a monitor or other peripheral, depends on the operation of other (master) devices. A load-sensing control device should be implemented for such a relationship. It automatically energizes and de-energizes secondary devices based on the “sensed” power load of the primary device(s). Whenever the primary device goes into a power state below a given threshold, the load-sensing control can power down the secondary devices. The sensed (primary) load is typically an electrical outlet or an auxiliary port (e.g., universal serial bus (USB) in the case of a computer).


Occupancy-Control Device: Occupancy control can save a great deal of energy as it energizes plug-loads only when users are present and de-energizes them when the space is vacant. This approach pinpoints the main source of wasted energy during non-business hours and reduces wasted energy during business hours. However, the largest drawback is that occupancy controlled devices may energize and de-energize outlets at inappropriate times.


Manual-On, Vacancy-Off Control Device: A manual-on, vacancy-off control device is a slight modification of the occupancy-control device. It energizes a plug-load when it receives manual input from a user and de-energizes the plug-load automatically based on lack of occupancy. This control should be implemented for plug-loads that are needed only when users are present (e.g., task lights, monitors, and laptops).

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49 Results : plug load control

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    EE lighting, HVAC and controls and reducing plug loads.  Install RE (Solar,
    https://sftool.gov › Content › attachments › Iswg › iswg-case-studies › 3 - 092216_ISWG Campus Management_FINAL.pdf
  • Slide 1

    EE lighting, HVAC and controls and reducing plug loads.  Install RE (Solar,
    https://sftool.gov › Content › attachments › Iswg › iswg-policies-strategies › 3 - 092216_ISWG Campus Management_FINAL.pdf
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    ...intended use, occupancy, operations, plug loads, other energy demands, and design...Occupancy, including continuous humidity control within established ranges per climate
    https://sftool.gov › Content › attachments › Iswg › iswg-tools › 14 Erin Shaffer - Principles for New and Renovation Construction.pdf
  • Title of presentation

    ...refrigerated display case lighting  Plug and Process Loads  Low voltage distribution
    https://sftool.gov › Content › attachments › Iswg › iswg-tools › 9 Kristin Tadonio - Cross-Sector EE Opportunities.pdf
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    https://sftool.gov › plan › upgrades
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    ...smart transportation choices; and controls stormwater runoff. Additionally, appropriate...vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, dedicated
    https://sftool.gov › learn › about › 46 › sustainable-sites
  • Advanced energy star® training

    EPP  Modifying specs related to:  Plug Load (7 to 4 watts per SF)  Utility Reporting
    https://sftool.gov › Content › attachments › Iswg › iswg-policies-strategies › Green Leasing - AKosmides Mar2013.pdf
  • Microsoft Word - Supporting the Health of Honey Bees and Other Pollinators

    ...maintain, or exercise any editorial control over the information you may find...the soil to address compaction. Small plugs and one gallon containers of native
    https://sftool.gov › Content › attachments › supporting_the_health_of_honey_bees_and_other_pollinators.pdf
  • A Temperature and Seasonal Energy Analysis of Green, White and Dark Roofs

    .......... 5 Figure 2: Photograph of control roof sensors .......................is also improving its temperature control relative to the white surface. The
    https://sftool.gov › Content › attachments › Columbia_A_Temperature_ and_Seasonal_Energy_Analysis.pdf

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