Helping Home Owners And Businesses Understand Energy Usage

In homes and commercial buildings, about one-third of electricity consumption is attributed to miscellaneous and electronic loads (MELs) — appliances like toasters, printers, fans and clocks. Many devices fall into this category; however, because of the variety of devices and the expense of the technology used to test them, their energy use is not understood very well.

Luckily, Lawrence Berkeley National Laboratory has teamed up with the University of California-Berkeley to develop a better understanding of the variety of small appliance loads, estimate their load growth and to develop inexpensive technologies to monitor them. Knowing which devices use the most energy and what their energy load profiles look like will help researchers, homeowners and manufacturers understand how to better manage their energy use.

The UC-Berkeley team developed a wireless sensor network platform that uses alternating current meters to provide data as frequently as every 10 seconds that are accurate to about 0.5 percent of the actual reading. The meters are less than three inches long and are plugged into an outlet. The device that is to be measured can then be plugged into the meter. Each meter used in the study cost about $80 and used about 1 watt of power, adding very little to the building’s electric load. The meters wirelessly transmit the data back to a central database.

Building 90, an 89,000-square foot office building at Berkeley Lab, served as the commercial setting for the miscellaneous and electronic loads (MELs) study. 460 meters were placed throughout the building to serve as a representative sample of a wide range of device types. | Photo courtesy of Berkeley Lab.

Building 90, an 89,000-square foot office building at Berkeley Lab, served as the commercial setting for the miscellaneous and electronic loads (MELs) study. 460 meters were placed throughout the building to serve as a representative sample of a wide range of device types. | Photo courtesy of Berkeley Lab.

The team tested the energy use of MELs in both residential and commercial settings. Two existing homes in California and one net zero home in Massachusetts made up the residential sample, with 75-80 meters per home. The commercial sample consisted of an 89,000-square foot office building at Berkeley Lab housing about 450 occupants, with about 460 meters placed throughout the building to serve as a representative sample across a wide range of device types.

In the office building, the most common devices were computers, computer displays and other peripherals such as printers and external drives. The team found that most computers are in the “on” mode almost all the time, but a significant number of computers are powered down much of the time. Likewise, displays in the building are rarely left on.

Providing information like this to a building energy manager would allow them to empower employees to take simple steps to improve the efficiency of their work space, such as asking employees that never turn off their computers to enable their energy-saving low power mode.

Now, the research team is exploring low-cost methods to measure electricity use of electronics through technology integrated into the appliance itself. This would allow for a much richer data profile of a building’s energy use. The team is also working with the efficiency community and manufacturers to reduce the energy use of electronic devices by developing advanced controls and reducing power use while the devices are operational.

Learn more about the National Labs and their work to help consumers and businesses save energy and money.

doe-energyEditor’s Note: EarthTechling is proud to repost this article courtesy of the U.S. Department of Energy. Author credit goes to Ben Dotson.

The mission of the Energy Department is to ensure America’s security and prosperity by addressing its energy, environmental and nuclear challenges through transformative science and technology solutions

    • This is interesting research. We would welcome any efforts for the research and efficiency communities to work more closely, as the article suggests.

      When it comes to computers and monitors there is already much evidence to suggest that employees leave computers in the ‘on mode’ almost all of the time. We also know that asking employees that never turn off their computers to enable their energy-saving low power mode, only really appeals to this most environmentally motivated or cost-conscious employees.

      In this example, what’s really needed to support business leaders, energy managers and staff is low cost, quick-to-deploy PC power management technology such as our own Verismic Power Manager. On-premise or cloud based, PC power management technology can provide a detailed insight into PC devices on the network and the power usage behaviour of those devices. Companies can collect metrics and position power policies just hours after the technology has been installed.

      Completely invisible to the user, through clever artificial intelligence, the technology can also learn user behaviour and throttle back PC power consumption when the device is not in use, such as when an employee is in a meeting or has left work for the day.