Heapy Engineering’s Building Optimization Practice Leads Client to National Recognition

Association of Energy Engineers Energy Project of the Year

 

Award croppedCongratulations to LexisNexis as their campus in Dayton, Ohio was awarded the Energy Project of the Year for Region III at the 2017 AEE Regional Awards in Atlanta, GA. Working with the Facilities Staff at LexisNexis, Heapy Engineering led the effort to make a dramatic reduction in the campuses’ overall Energy use.

The Dayton campus consists of six buildings, where Building 1 is a data center, and Buildings 2, 3, 4, 5, and 6 are office spaces. LexisNexis has been completing a systematic upgrade of the building control and automation systems throughout each of the office buildings. The previous systems were a mixture of pneumatic and first generation DDC control systems. The control projects replaced the air handling unit and plant controllers, added a new front end building automation server, and installed new control dampers in the supply air distribution system.

Each building was designed with similar HVAC systems: central variable air volume air handling units (VAV AHUs) serving variable air volume thermal diffusers with perimeter hydronic heating and a central chilled water system. Due to the limited modulation capabilities of the thermal diffusers, the systems were being operated as mostly constant volume with variable temperature as this was the only method to keep occupants comfortable.

The control upgrade projects were executed in many phases. First the AHU and hot water system controls in Buildings 2 and 3 were upgraded. Next the AHU and hot water system controls in Building 4 were completed. However, as part of the control upgrade project to Building 4, the air distribution systems was divided into large control zones, each with a control damper and duct static pressure sensor. The control of these zones was tied to local space temperature sensors. This turned each zone into a pseudo large VAV terminal box.

With the new control dampers in place, the system could now be controlled like a true VAV AHU system without the risk of occupant discomfort. New control strategies such as discharge air temperature reset and static pressure reset could be implemented. After the success of Building 4, control dampers were added in Building 3 as well.

The upgrade of Building 5 and 6 is under contract now and will be completed by the end of 2017. In addition to upgraded AHU and VAV controls, this project will include integration to the central chilled water plant to incorporate chilled water reset and differential pressure reset. These strategies are now possible since all AHU controls are networked together.

The completion of the Building 2, 3, and 4 projects were an integral part of LexisNexis winning Dayton's regional year-long "Bring Your Green" competition hosted by DRG3 and DP&L.

 

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