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Sooners Describe Mathematical HVAC Monitoring Formula

February 21, 2014 By Leon Walker

SoonerUniversity of Oklahoma researchers have devised a mathematical formula to monitor energy use in HVAC units that can be used to detect unreliable systems and faulty equipment that affect energy consumption.

The formula, devised by a team led by Li Song, University of Oklahoma assistant professor in the College of Engineering’s School of Aerospace and Mechanical Engineering, uses existing output data, such as pump speed and power to monitor the units to create virtual sensors to identify energy waste at the air-handling unit as well as at a whole-building level.

Nearly 95 percent of all US companies don’t monitor their building energy efficiency due to a lack of awareness, existing infrastructure restrictions or the prohibitive cost of commercial monitors, according to the University.

Besides saving companies money on utility bills, Song’s formula is a low-cost option to commercial monitors. Song estimates one ultrasonic flow meter, which monitors water pump performance, could cost as much as $5,000, and an organization would need to buy several monitors to get an accurate picture. Song’s virtual process uses little to no hardware and is within a plus/minus 2 percent degree of accuracy compared with commercial meters.

Prior to developing virtual sensing, Song implemented the energy monitoring and operation fault detection and diagnosis manually in more than 100 buildings with cumulative savings exceeding $70 million. In one building alone, her method reduced annual electricity consumption by 53 percent, electricity demand by 21 percent and gas consumption by 49 percent in one year. In another building the structure qualified as an Energy Star building five months after the evaluation.

Song’s research, which has focused on corporate efficiencies, is now entering the government sector. Her research team was recently awarded a three-year, $1 million contract from the US Department of Defense to increase building efficiencies at military installations. Her first analysis focuses on Tinker Air Force Base in Oklahoma City, Okla.



2 comments on “Sooners Describe Mathematical HVAC Monitoring Formula

  1. Congratulations Li Song ! You and your team have the ability to show the tremendous energy waste in our buildings.
    To take this one step further, please visit our web site and postings on LinkedIn, Facebook and Twitter. Black Duck Industries Inc. has the means to reduce energy consumption even more, saving fuel, carbon emissions and the ability to breathe clean air.
    Ms. Song, after reviewing our products, if you would like to further your work in building efficiency, we are in need of a joint venture with a University to complete our R&D work to move into the pre-production stage of development. Perhaps Oklahoma U. would like to work with us.
    Please contact me if there is interest.
    Regards,.
    David Carpinetti
    President & CEO
    Black Duck Industries, Inc.
    508-340-5064 c.

  2. I’d like to point out that these methods are already in use a number of years within ICIS award winning and patented virtual metering technology. From what I’ve read here I don’t see a difference in what they’ve developed to what’s currently available as an off-the-shelf product from http://www.icissoftware.com, who have also published articles on this exact topic since 2008…

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