Nottingham City Council

Sabien was asked by Nottingham City Council to demonstrate the energy consumption and CO2 savings by installing Sabien’s M2G technology to eight boilers at three Nottingham City Council sites.

Average savings of 9% - payback in 52 weeks

M2G technology delivered a 9% reduction in consumption over the three sites; 12% reduction in gas consumption at the Southglade Leisure site, 7% reduction at the Portland Leisure site and 8% at Ellis Guilford School site. Savings were calculated using energy consumption data supplied by Nottingham City Council.

What is M2G?

The M2G is an intelligent boiler load optimisation controller that improves the efficiency of each individual boiler. A unit which can be retro-fitted to each boiler monitors the temperature of the water in the flow and return every 10 seconds and the information is recorded with heat transfer rates at the first and second stage firings.

When a loading demand is made the system, automatically checks the latest data it has stored and decides whether it is more economical to retain first stage firing or to introduce a second stage firing. The result is a substantial fuel reduction during less demanding situations while ensuring maximum capacity during heavy load periods.

Building Management Systems (BMS)

The M2G integrates seamlessly with Building Management System. The majority of M2G installations are in buildings which have Building Management Systems already in place.

Pilot Methodology

The test conditions and methodology were agreed with Nottingham City Council. The 3 pilot sites were chosen by the client and represented a cross-section of the Nottingham City Council building portfolio. The pilot was conducted over 30 days.

M2G can be configured to operate in either ‘Save’ (i.e. days when the M2G is operational and makes savings) and ‘Bypass’ (i.e. days when the M2G is bypassed and makes no savings) mode. A comparison of the boiler firing periods was made between Save and Bypass days.

Variations in outside temperature were accommodated using industry standard degree day calculations. Ambient room and hot water temperatures were unaffected during the pilot period.

Sabien managed the pilot from start to finish, working closely with the onsite engineers.

Integrates with Building Management Systems

The M2G integrated seamlessly with the existing Building Management Systems. The majority of M2G installations are in buildings which have sophisticated Building Management Systems.

To read the full report on the Nottingham City Council project

Many public organisations have used Salix funding to fund M2G installations.