Volume flow control from Belimo

DCV system: Only as much as necessary - not as much as possible.
Variable-volume ventilation system with demand-controlled ebm‑papst fans.

Approved Controller

DCV - Demand Controlled Ventilation

This term describes the demand-controlled operation of a ventilation system. The air exchange rate relates to the current room demand, not to the calculated full load. Air quality and temperature are used as control variables for the associated precision air flow controllers (VAV-Compact) from Belimo.

The fans in the air conditioning system run according to demand and energy-efficiently. To achieve this, the demand of the downstream air flow controllers is used directly to control the intelligent infinitely variable EC fans. Only the exact pressure necessary to transport the required partial air flow through the duct system is generated. DCV systems of this kind conform to energy efficiency class A, EN 15232 - Energy efficiency of buildings, and are a byword for highly energy-efficient building automation and technical building services management. Are you looking for ventilation systems offering high levels of comfort combined with low energy consumption? With a DCV system, that’s no longer wishful thinking!

Note:
Conventional admission pressure-controlled ventilation systems are operated in such a way that the admission pressure matches the full load volume continuously, even when running at partial load most of the time. The excess admission pressure generated at partial load is eliminated by the damper blades of the downstream VAV boxes. The consequences:

  • Excessively high duct pressure with unnecessary pressure loss in the duct system and via the VAV boxes.
  • Increased flow noise.
  • Unnecessarily high energy consumption by the fans.

Fan Optimizer principle - the pressure-returned air flow control system


In a pressure-returned air flow control system1), the flap positions of the VAV controllers are captured via a field bus, MP bus, LON, Modbus, KNX®, etc. and used as a demand signal for energy-efficient control of the infinitely variable EC fans. This method is referred to as the “Fan Optimizer” function or principle.

Approved Controller

The Fan Optimizer principle evaluates the system's damper configuration to generate the setpoint value for the EC fans. This runs the fans down almost to the optimum operating point (setpoint O) until the dampers are mostly in the optimum operating range. Closing dampers signify falling demand/pressure too high, opening dampers signify rising demand/pressure too low: the EC fans are adjusted down or up along the system curve accordingly.

The result and benefits:

  • Reduced pressure loss in the duct system
  • Lower pressure in the duct system
  • Lower flow noise 
  • Significantly reduced energy consumption by the fans

1) Not to be confused with a pressure-controlled system.
The main disadvantage of conventional pressure-controlled systems is that the fan control is open loop, meaning there is no feedback from the air flow controllers. Not the current air flow demand, but the duct admission pressure (K) required at full load, is applied to calculate the setpoint. If the air flow is reduced, the pressure in the duct system rises along the fan curve. The pressure control then regulates the channel pressure back to the full load level; the currently required partial load setpoint is unknown. The downstream VAV boxes are forced to eliminate the excess duct pressure (K-O) by closing the dampers. In practice, VAV boxes with dampers closed down as far as 10% in some cases are encountered on such systems.

The consequences:

  • Unnecessarily high pressure loss in the duct system and via the VAV boxes. As a result, the energy consumption of the fans is much too high.
  • Unnecessarily high pressure in the duct system. Resulting in disturbing flow noises.
  • Every change, every air flow adjustment, requires manual correction of the duct pressure setpoint. In practice, however, this is rarely implemented - which is of course not without consequences.
Approved Controller

Fan Optimizer COU24-A-MP

Application: Small to medium-sized MP bus systems.

The Belimo COU24A-MP Fan Optimizer provides a ready-to-use control solution for small, simple systems. As many as 8 VAV-Compact controllers can be connected to a COU24-A-MP via the MP bus. More COU24-A-MP units can be added to the system via a 2-wire cable. The GreenTech EC fan is controlled by a 0 - 10 V signal. Benefits:

  • Tried and proven Belimo VAV technology
  • Fan featuring state-of-the-art GreenTech EC technology
  • Simple engineering and efficient commissioning thanks to preconfiguration and adaptive control response of the COU24-A-MP Fan Optimizer
  • High energy efficiency
Approved Controller

Application: Small to large installations

DDC solution with Fan Optimizer function - MP partner solution, KNX®, LonWorks® controller

MP partner DDC solution or KNX®, LonWorks® controller with integrated Fan Optimizer function. The Fan Optimizer function is programmed using the predefined application library or by the system integrator. The installed Belimo VAV-Compact controllers are connected to the DDC controller via the corresponding field bus interface. The GreenTech EC fan is controlled by a 0 - 10 V signal.

Benefits:

  • Tried and proven Belimo VAV technology
  • Fan featuring state-of-the-art GreenTech EC technology
  • Direct field bus integration of VAV-Compact
  • High energy efficiency
Approved Controller

Application: Small to large installations

MODBUS-RTU controller with Fan Optimizer function

DDC application with integrated Fan Optimizer function. The Fan Optimizer function is programmed using the predefined application library or by the system integrator. The LMV-D3 Modbus VAV-Compact controllers from Belimo and the GreenTech EC fan are connected to the DDC controller via MODBUS-RTU.

Benefits:

  • Tried and proven VAV technology from Belimo
  • Fan featuring state-of-the-art GreenTech EC technology
  • Direct integration of VAV and fan into MODBUS-RTU automation system
  • High energy efficiency

VAV control solution

 
Approved Controller

VAV-Compact, e.g.: LMV-D3-MP, Belimo Assistant app

Ventilation in functional buildings: VAV-Compact

Cost-effective complete VAV solution with integrated dynamic differential pressure sensor, air flow controller and drive in a compact unit for variable and constant air flow systems. The highly sensitive sensors enable precise Δp measurement and regulation of even the lowest air flow rates. Flexible tools adapted to the workflow: PC tool, Service tool, Smartphone Assistant app.

Note: VAV components are only available from manufacturers of VAV boxes (OEMs).

Comfort ventilation in residential buildings: CMV system

Modern energy-optimized homes nowadays essentially require controlled ventilation. To precisely regulate the volume of air, new, innovative solutions such as the CMV-…-MP are needed. As a complete control system, it combines all the necessary components in a single unit: Air speed sensor, air flow controller and damper drive with integrated damper blade. All parts are perfectly matched, so ready for immediate use. Installed internally, the unit provides precise control of the air flow with minimized energy consumption and with no disturbing flow noise. Tools: PC tool, Service tool.

Note: The CMV-…system is only approved for residential applications, and available exclusively from manufacturers of VAV boxes (OEMs).

Approved Controller

CMV system, e.g.: CMV-100-MP

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