Q. Building Energy Management Systems (BEMS) reduce energy consumption so why do I need any other controls.
A. A properly commissioned and maintained BEMS will certainly reduce energy consumption by ensuring the building is fully optimised and that the heating system as whole is scheduled to come on at the right time, or sequence the boilers or lower the system temperature depending on outside temperature.
However, it is highly unlikely the BEMS or BMS has been programmed to optimise each individual boiler, this is where additional control is required, M2G is designed to integrate with existing BEMS/BMS to eliminate ‘dry cycling’ further reducing fuel consumption and carbon emissions.
Typically a BEMS/BMS is programmed to manage the heating system (i.e. the building) as a whole, rather than controlling the performance (fine tuning) of individual boilers. Typical BMS strategies may include optimum start/stop, weather compensation or boiler sequencing.
This is usually achieved by monitoring the blended water temperatures from all of the boilers via the common return header to the boilers rather than measuring the individual boiler(s). As a result, any energy wastage through boiler dry cycling at an individual boiler level is not always detected or prevented by the BMS control.