New College Durham improves energy rating N

Danfoss Drives, together with HVAC partner Digicon, has helped thousands of businesses become greener and more efficient, including New College Durham

ew College Durham is a higher education and sixth form college in

County Durham, England. The institution has been actively working on making sustainability and carbon reduction a key element of its operations for many years. In July 2017, following discussions with

Danfoss business partner, Digicon Solutions, the college decided to install Danfoss VLT FC102 HVAC drives in 30 air handling unit fan (AHU) applications. The drives were integrated into the existing CYLON BMS with kWh consumption data being analysed over the entire site. The VLT HVAC FC 102 drive brings

optimised process control to all heating, ventilation and air conditioning (HVAC) applications. Easy to use and to install, the drive features a wide range of functions that have been specifically developed for use with pumps, fans and compressors to save energy, meet environmental regulations and reduce costs in modern buildings.

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construction and are available with several supply voltages and power ranges. The drives enhance the performance of pumps, fans and compressors. All of the necessary hardware, I/O options and communication protocols are built in and are well suited to the requirements of the building industry.

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WASTED ENERGY Prior to installation of the drives, all the AHU fans on the college’s sites operated at full speed all the time, which wasted a lot of energy. To remedy this, carbon dioxide sensors were installed in the AHU return air ducts and connected through the BMS, which enabled the actual occupation level of each individual area being served to be measured and controlled. The speed of the fans was then automatically reduced or increased by the drives to provide the exact rate of air exchange needed to maintain a

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healthy and comfortable environment. “We are very happy with the newly

implemented system which has provided the outcomes predicted in the initial survey from Digicon,” explains Richard Newton, estates manager from New Durham College. “We’ve made very large energy savings thanks to the accurate control the new inverter drives have provided over the air moving systems within the college. Crucially, in order to achieve the maximum benefits, the units are being used in tandem with focussed building reviews and regular optimisation of control systems at a BMS level. “The big benefits we’re getting have led

us to looking into other applications within the building where there is potential for using inverter drives to move from fixed speed to variable speed operation, and we already have several new applications in mind.”

IMPROVED PERFORMANCE In the twelve months since the project was implemented, the energy savings produced by the new Danfoss drives have been reflected in the improvement in the college’s already outstanding energy performance operational ratings, which are included in the building’s DEC (display energy certificate). The rating for the main building has

improved from 60 to 55, while the sports and music building has improved from a rating of 57 to 54. The college’s estates and facilities team have reported a positive impact on the building’s environment, from the point of view of both students and staff. A marked benefit has also been noted

to the working environment and a significant reduction of complaints during extreme weather, resulting from the capacity to alter speeds and air flow from a supply and extract point of view in relation to air quality, temperature, humidity, and so on.

Danfoss Drives 18 SUMMER 2019 | ENERGY MANAGEMENT 

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