If you need a flexible solution that can adapt to fluctuating occupancy while using only the amount of energy, then using Schneider  Altivar ATV212 variable speed drives to regulate air pressure and temperature may provide a solution.

It can difficult to make heating and air conditioning systems more energy efficient without affecting occupant comfort, and this is made more complicated when the HVAC systems are set up on a floor by floor basis.

In a chilled-beam HVAC system, the most energy-efficient solution for this type of heating/cooling system would be to add temperature regulation functions via a thermostat, plus pressure regulation in the beam and the room.

The thermostat (T) (see diagram) controls air flow by adjusting the shutters on the intake vent (1). The pressure in the heated beam (2) and the room (3) are kept at constant levels by varying fan speed. The two ATV21 variable speed drives feature an integrated proportional regulation function that allows them to control the fans directly based on information from the pressure sensors (P).

Installing presence detectors, automatic blind controllers, and timers will enable further fine tuning and will require a building management system (BMS).  If installed, the variable speed drives and sensors would be connected to the BMS via a communication bus.

Benefits for the user

– Save up to 20% off your energy costs by using independent variable speed drives

– Minimize maintenance and filter clogging

– Quieter operation

– Use up to 50% less energy by integrating variable speed drives into your building management system (BMS)

– Regulate temperature within a defined range

– Provide constant ventilation

– Add presence detectors and automation systems to further optimize the system

– Smoother starting increases the lifespan of mechanical components and reduces frequency of maintenance

The Altivar 21 variable speed drive is designed specifically for building systems

The Altivar 212 variable speed drive is available for three-phase asynchronous motors from 0.75 kW to 75 kW.  It has been designed for the most common fluid management Heating, Ventilation and Air Conditioning (HVAC) applications in buildings the service sector.

Its design is based on eco-energy with a reduction in energy consumption of up to 70% compared to a conventional control system. The Altivar 212 is operational from the moment the power is turned on and it can be integrated into a building energy management system to achieve maximum energy efficiency.

Go  here for Schneider/Telemechanique Altivar inverters from stock at discounted prices