When NHS Tayside recognised the opportunity to reduce operating costs by preventing boiler dry cycling, Sabien Technology was commissioned to verify the cost savings delivered by its M2G boiler load optimisation controls at the Kings Cross Hospital in Dundee.
Following a detailed measurement and verification project, average fuel savings of 7% were delivered with a payback of 1.8 years and an annual reduction in CO2 emissions of 45 tonnes.
“Delivering cost savings is a key area of focus for NHS Tayside,” recalls NHS Tayside’s Energy Co-ordinator, John Ruddy. “Reducing heating costs is always paramount due to the high heating demand within the healthcare sector. We decided to verify what savings M2G could deliver and we are pleased with the outcome.”
“There are additional benefits over and above the cost savings. The installation has no impact on clinical practices – enabling all areas of the hospital to be functioning as business as usual whilst the installations are being completed. Furthermore, with a varied building stock, boiler plant and Building Management System across the estate, M2G can be deployed regardless, ensuring estate wide savings are captured,” he continues.
The Measurement and Verification project involved M2G being installed on Hamworthy Wessex 200HE, Hoval Ultragas 500 and Hamworthy Purewell Classic boilers. Sabien’s M1G was also installed to the hospital’s direct fired hot water heaters.
Energy consumption was then measured, compared to previous consumption using Degree Day data to allow for weather variation.
M2G improves the energy efficiency of commercial boiler plant by optimising each individual boiler, delivering real time analysis and control to reduce energy costs. By measuring the flow and return of each boiler every second and analysing this data every 10 seconds. M2G can instantly identify and distinguish between dry cycling and a genuine heating demand.
Dry cycling is a common inefficiency found in boiler rooms and is well known within the industry but largely ignored. M2G works alongside the existing controls and strategies such as sequencing, weather compensation and demand based control. M2G is widely recognised as a key initiative to reduce energy costs for many private and public sector organisations.
