aDCV - patented adaptive pressure regulation
Patented adaptive pressure regulation (aDCV)
The patented adaptive pressure regulation aDCV developed by Aldes optimises energy and regulation-related weaknesses occurring in constant pressure regulation in ventilation systems with variable airflows. Using patented adaptive pressure regulation can give up to 43%* savings on energy costs.
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The patented Adaptive Pressure Control can cut energy costs by up to 43%*..
*up to 43% compared to units with constant pressure regulation (VAV).
Up to 20% compared to demand-controlled units with constant pressure regulation (DCV).
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aDCV has several advantages
Use aDCV and achieve energy savings with lower pressure drops and lower sound levels
In constant pressure regulation, a constant pressure through the ventilation unit is available in all airflow areas (Fig. 1 - blue line).
In variable volume flow systems, on the other hand – e.g. zone regulation via CO2 or humidity – the ventilation unit requires lower pressure drops in the system in cases where the airflow is lower (Fig. 1 - red line).
SFP value
PAD - the patented adaptive pressure regulation lowers the pressure in the ventilation unit when airflow falls, providing only the necessary airflow.
In this way, the ventilation unit uses significantly less energy than with constant pressure regulation, especially in partial load zones (Fig. 2 - red line)

Sound levels
Due to the lower pressure requirements in the ventilation system's partial load zones and the fan's resulting lower motor rpm, the ventilation unit runs much more quietly.
Consequently, any volume flow regulators present do not need to reduce surplus pressure and therefore generate less noise. (Fig. 3 - red line).
Sound reduction will be most noticeable at low loads.

After entering the reference values, the EXcon control system in our VEX4000 units calculates an airflow pressure curve for controlling the ventilation. During operation, the control system measures the airflow and pressure and corrects the setpoints in case of deviation.
A |
Pmin |
Qmin |
B |
Pmin + (Pmax - Pmin)/2 |
Qmin + (Qmax - Qmin)/4 |
C |
Pmin + (Pmax - Pmin) x 3/4
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Qmin + (Qmax - Qmin)/2
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D |
Pmax |
Qmax |