Belimo

A fan for all seasons
July 14th 2006

The new Belimo Fan Optimiser allows fans to be controlled based on demand according to the damper positions of the downstream VAV units. Supply pressure regulation – presently the standard method – can thus be dispensed with and fan energy consumption cut by as much as 50%. Costs will be cut substantially and the convenience for users increased

Until now, constant regulation of the fans has ensured that even the most inaccessible VAV unit receives sufficient supply pressure. Since the remaining units are provided with too much air as a result, they have to eliminate the excess pressure by closing the dampers. This means noisy operation, inferior control characteristics and a lot of unnecessary energy consumption.

Belimo MP technology allows fan output to be selectively controlled based on actual demand. The actual damper positions of the VAV controllers and the demand signals of the room temperature controller are transferred to the COU24-A-MP Fan Optimiser via the MP-Bus. They are then passed on to the fan control.

The massive energy savings are a practical way to achieve better values with regard to the new EU energy efficiency directives. By additionally doing away with the costs for the pressure regulation system and significantly reducing wiring expenses through networking via the MP-Bus, this solution guarantees rapid payback – in new, retrofitted or renovated systems.

Belimo Fan Optimisers can be used in variable and constant volumetric flow systems in the room ventilation field with fans that are controlled by a frequency converter. The damper position of each VAV unit is transferred to the Fan Optimiser via the MP-Bus. It is used there as a control variable to facilitate energy efficient operation of the frequency converter controlled fans. The damper which is open the widest serves as a reference.

Advantages

• Fan energy consumption reduced by up to 50%.
• Cost saving because supply air and outgoing air pressure controls pre eliminated.
• Reduced flow noise thanks to the lower pressure in the air duct system.
• Automatic compensation of pressure losses due to filter contamination guarantees supply regularity.
• Rapid payback – even in small or medium-sized buildings.
• Flexible system concepts (CAV, VAV or combined CAV/ VAV).
• Reduction in cabling thanks to networking via MP-Bus.
• Simple engineering and efficient commissioning thanks to pre-configuration, LCD display and adaptive control characteristics.

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