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Proper Ventilation Reduces Roof Top Annual Operating Costs by $2,300 in a Small School

The Problem

With funding from the Massachusetts Green Communities Grant Program, AEI studied a small 150,000ft2 middle school campus in Carlisle, MA to uncover energy savings opportunities through O&M changes that are no/low cost to the Town. The campus has several connected buildings, wild occupancy swings, and recently installed a thermal wheel as part of a major renovation to the largest building on the campus. The scope also includes building several years of baseline performance data for use when considering future capital projects.


By evaluating the Johnson Controls BAS data we uncovered several opportunities, one of which was an the outside air damper that was ~50% open during the heating season (NIST APAR Rule #2 Mode 1) when the Outside Air Damper Command was 10%. The CO2 levels in the space during this time period are rarely above 425ppm, indicating there is no reason for this excessive amount of ventilation. This would indicate that the outside air dampers are stuck, not operating smoothly, or are operating through a narrow range.

The introduction of excessive outside air was costing the school approximately $2,300 per year in fuel to condition the air. The data led us to the roof of the school where a disconnected actuator was found as the cause. The corrective action also saves the school approximately 1,565 therms (3.0 tons of landfill waste) in GHGe. We also recommended the installation of a VFD on the RTU to generate an additional savings of $1,509 and 10,800kWh (2.7 tons of landfill waste) from reduced electricity usage.

New AEI Energy Maps Just Released

We've just released public versions of our AEI Energy Maps for Los Angeles, San Francisco, New Orleans and others built in partnership with the U.S. DOE Better Communities Alliance.

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AEI Featured on Energy Matters 2U Podcast

AEI was recently featured along with Leidos on an Energy Matters 2U Podcast. During the 20 minute conversation, Carl Popolo of AEI and Ron Gillooly, Leidos' Industrial Energy Program Director, discussed how a building's energy data profile combines with a physical audit to target efficiency measures that have specific and verifiable results.

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AEI To Provide Energy Maps to U.S. DOE Better Communities Alliance

AEI is pleased to have been selected as an Affiliate to the U.S. Department of Energy Better Communities® Alliance. AEI is committed to provide its Energy Map solutions to selected partners from a list of 40 noteworthy cities such as Atlanta, Chicago, Denver, Houston, Los Angeles, Miami, New York and San Francisco.

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AEI Selected as MHEC Supplier

June 29, 2017 -- Carlisle, MA -- AEI has been selected as a Massachusetts Higher Education Consortium (MHEC) supplier to provide Facility Maintenance and Energy Assessment Software to MHEC members through June 2020. The letter from MHEC reads: "Your bid response was evaluated and determined to be the most responsible and responsive bid that offered best value to MHEC members".

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Whole-Portfolio Real-Time Main Metering

AEI brings to market a whole-portfolio real-time main meter view of cities, towns and campuses by combining our AEI Soft Start Real-Time technology with our proven Energy Map visualization platform.

For the energy manager who needs to see energy use across the entire building stock in real-time, this affordable solution shadows the utility main meter, requires no BAS integration, feeds upstream applications such as kiosks, and gives the manager real-time insight into demand response opportunities on their own terms. With 1-minute resolution, rolling profiles and SMS and E-Mail alerts, this integrated solution can also help control billing-period peak usage. It's completely incorporated into our Energy Map platform for exploring historical usage, and that means one-stop-shopping for your energy team to study utility trends, track sustainability goals, and to know your real-time position for social awareness and real-time response.

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The Bigger Apple: City of New York Energy Map

Building on our work last year to deliver an Energy Map of the City of Boston, we figured we should demonstrate a little scalability and bite on something bigger. The result is our City of New York Energy Map that combines data from the PLUTO and LL84 disclosure reporting datasets and shows electricity, natural gas, oil, steam and water consumption for over 13,000 properties with a combined GSF of over 1.8 billion ft2. The data includes GHG emissions, and for most properties we're able to show trends since 2011.

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