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Energy savings in 3D with CO2

Posted in Energy conservation, Heating and cooling on September 30th, 2015 by Susan – Be the first to comment

PUD Engineer Jim White’s Variable Air Volume box, 3D-printed in plastic at the Department of Energy’s Oak Ridge National Laboratory.

PUD Engineer’s proposal wins national crowdsourcing contest

A breath of fresh air is always nice, but too much of it can result in wasted energy that’s costly to owners of commercial buildings.

A proposal from PUD Engineer Jim White to use carbon dioxide monitors to help control air volume in buildings got the nod from the Oak Ridge National Laboratory, winning the lab’s Buildings Crowdsourcing Community Campaign last month.

Jim White

CO2 sensors will be installed next to 60 thermostats in the PUD’s Headquarters Building in downtown Wenatchee.

White, a Senior Energy Efficiency Engineer with a PhD in mechanical engineering, won in the Sensors and Controls category for his design for variable air volume (VAV) mixing boxes. His design combines temperature and carbon dioxide sensors to control outside airflow settings of individual VAV boxes. It could yield significant energy savings while improving air quality.

A model of the concept was 3-D printed and exhibited at the lab’s Industry Day on September 24.

‘A kid in a candy store’

White said he felt like “a kid in a candy store” at the conference, which featured displays and demonstrations of scientific advances. For example, White said he watched a clothes dryer technology that uses ultra-high frequency sound vaporize water from clothing in seconds. This could be used to quickly dry clothes at the end of a wash cycle, eliminating the need for a separate dryer.

Now that’s something we can relate to.

Unless you’re a building scientist or operator, White’s innovation seems a little more obscure. But it has the potential to reduce energy use in buildings significantly.

White’s idea will be put to the test at the PUD’s Headquarters Building this winter, where he expects to cut energy consumption by 20 percent. That’s in addition to a 35 percent drop in energy use from earlier improvements made at the office building on Wenatchee Avenue.

CO2 sensor

The monitor on the left shows carbon dioxide levels in a room, while the chart on the right indicates whether a room is adequately ventilated.

How does the carbon dioxide theory work?

Humans emit carbon dioxide as they exhale, White explained. Carbon dioxide sensors can be used to indicate how much ventilation is needed for any given space. Instead of setting air flow at a fixed position, which can cause the space to be over air-conditioned, CO2 sensors can be used to vary the volume of air based on actual ventilation requirements – what those in the room need to be comfortable and refreshed.

Keeping your cool

Tying air flow to carbon dioxide should eliminate over-ventilation and excessive cooling, which wastes energy. “This will still give the ventilation that’s needed, but allow for optimum levels,” White said.

Demand Control Ventilation is not new, White said, but using CO2 monitors in conjunction with individual VAV boxes has not been done elsewhere.

The PUD’s heating, ventilating and air conditioning (HVAC) uses a system commonly found in large commercial buildings. A large rooftop unit supplies a mixture of fresh and return air at 55 degrees to individual VAV boxes. A thermostat controls the damper in each VAV box to vary the volume of 55-degree air that is supplied to each zone. If the space does not need air conditioning, the VAV box could shut off the flow of 55-degree air to the space, but this would also stop the flow of fresh outside air. To make sure there is enough fresh ventilation air to the space, the VAV boxes are normally set to provide at least 20 percent to 30 percent of the maximum air conditioning needs of the space at all times.

If that amount of 55-degree air is too much, electric heaters will often come on to reheat the previously air-conditioned air. Depending on the season, this can waste electricity and make the space uncomfortably cool. Using a CO2 sensor to control the minimum air flow setting will reduce the amount of over-cooling, while also making sure the space is not over- or under-ventilated.

Oak Ridge National Laboratory launched its crowdsourcing platform in March so innovators like White could present ideas for energy efficient buildings to private and public sector leaders in research and development. The goal is to bridge the gap between cutting-edge ideas and the marketplace.

White presented his concept at the conference and took part in a panel discussion with two other winners and an official from GE.

White has been with Chelan PUD for 17 years, where he manages the PUD’s commercial and industrial energy efficiency program. Through his Resource$mart program, local businesses have saved thousands of dollars in energy costs. Prior to coming to Chelan PUD, White worked as an energy efficiency consultant at PacifiCorp and Portland General Electric, and as a staff engineer at the Governor’s Energy Management Center in Texas. He is a former board member of the Solar Electric Power Association and the architect of Chelan PUD’s award-winning Sustainable Natural Alternative Power program.

The Oak Ridge National Laboratory in Oak Ridge, Tenn., is the U.S. Department of Energy’s largest science and energy research facility. The heat pump water heater – a relatively new product promoted by Chelan PUD – was designed and tested at the lab and is manufactured in the U.S.

Don’t be chicken – watch this video

Posted in Appliances, Energy conservation, Heating and cooling, Lighting on January 31st, 2014 by Susan – Be the first to comment

PrintWe’re kicking off our 2014 energy-efficiency programs with a short video starring… a chicken! We think our ENERGY STAR appliance rebates, window and insulation rebates and free mobile home duct sealing programs are something to crow about.

Find rebate information, conservation tips and more on our website at ConservationMakesCents.org.

 

Now that’s a lot of power

Posted in Energy conservation on July 23rd, 2013 by Susan – Be the first to comment
Photo of Senior Engineer Jim White

Jim White, senior engineer for Chelan County PUD

PUD’s energy-saving program highlighted in regional magazine

Industrial customers working with Chelan PUD engineer Jim White have saved enough energy over the past three years to power 1,700 Chelan County homes.

White and his work with fruit warehouses is highlighted in an article in the July issue of the Northwest Public Power Association Bulletin. The story focuses on Stemilt Growers of Wenatchee. With guidance from White and funding from Chelan County PUD, Stemilt trimmed energy consumption at its largest fruit packing facility, the Olds Station plant just north of Wenatchee, by 30 percent, for $167,000 in annual savings.

White is Chelan PUD’s senior (and only) energy conservation engineer. He created and coordinates the utility’s Resource$mart program, which is essentially a rebate program. Under Resource$mart, industrial customers can receive up to 15 cents per annual kilowatt-hour saved or 75 percent of the total cost to purchase and install energy efficiency improvements, whichever is less. Commercial customers also participate in Resource$mart but at lower incentive levels of 6 cents per kilowatt-hour of electricity saved.

In addition to providing significant cost savings to industrial and commercial customers, Resource$mart helps the PUD meet conservation targets set under the state Energy Independence Act.

White can be reached at (509) 661-4829 or email james.white@chelanpud.org.  Read the article, and learn more about Resource$mart.