Why is M2G required?

The inherent problem

·    All boilers within an estate, no matter how modern, waste heat as a consequence of standing losses and lack of proper boiler temperature control.

·    When installed, over 80% of commercial boilers have over capacity for their application i.e. the boiler's maximum thermal output is rarely utilised.

·    Over capacity creates "dry cycling" i.e. boilers firing unnecessarily to recover the heat loss without contributing to "true" building load.

·    This results in unnecessary energy consumption and CO2 emissions which can be eliminated by M2G boiler optimization.

Research: Commercial Boiler Sizing. Source - European Energy Institute

  What is dry cycling?

·    The boiler fires to reach its set point, meeting the building's heating demands(load)

·    Once the set point has been reached the boiler stops firing. However, standing heat losses continue from convection and radiation losses and the boiler cools down loosing heat to the surrounding environment

·    The boiler will then fire unnecessarily to recover these losses even though the building requires no heat.   

Additional Heat Loss

The heat loss is exacerbated when the boiler enters a pre-purge before the next firing to remove any residue of combustible gases. This is effectively blowing cool air across the combustion space therefore cooling the boiler down before it begins to re-fire.

Boiler Purge Losses

Dry cycling throughout the year

Dry cycling occurs throughout the year, even if the boilers are just providing hot water generation during the summer months.

Annual profile of dry cycling

Results in continuous firing

As a result of the standing losses, Boilers will fire unnecessary to recover the standing losses resulting in wasted fuel consumption, costs and CO2 emissions. Dry cycling can be removed by fitting M2G - intelligent boiler load optimisation to each boiler. M2G identifies and removes dry cycling therefore reducing energy costs and CO2 emissions.

Illustration of boiler firings with and without M2G

M2G can mimic current boiler performance and output during periods of high demand. When the demand for heat drops off (part load conditions) e.g. mid-morning, afternoon, and night-time; this is when most of M2G boiler savings are made.

To find out more about M2G please call 1890 882 888

For technical queries E: Michael@gem.ie

GEM-Utilities Ltd, GEM Business Suite, 7 Cherry Ave, Ennis Road, Limerick.

Registered in Ireland company number 419724