FSM AG | Volume flow measurement

Demand-Based Volume Flow Control – The Key to Energy Efficiency

In modern ventilation systems, the days of fixed air volumes are long gone. Today, it is all about variable volume flows that adapt dynamically to the actual demand - e.g. depending on room occupancy, CO₂ concentration or room temperature, room humidity.

What Does Variable Volumetric Flow Control Mean?

Instead of working continuously with a constant air flow, the volume flow is regulated as required:

Fewer people in the room → less fresh air required → less air conveyance
Full load in production halls → Increased demand for fresh and extract air

This demand-based control means that only as much air is moved as is actually required.

Advantages of Volume Flow Measurement

Precise control and regulation

Demand-based air supply depending on room occupancy, CO₂ content or temperature
Reduction of energy consumption through optimized air delivery

Compliance with normative specifications

Prescribed minimum air volume flows in buildings in accordance with DIN EN 16798 or VDI 6022
Ensuring air exchange rates to guarantee hygienic standards

Monitoring & quality assurance

Documentation and monitoring in sensitive areas (e.g. clean rooms, operating theaters)
Early detection of faults or contamination in the air system

Typical Areas of Application

Automatisierte Produktionshalle mit zahlreichen Industrierobotern, die an Förderbändern arbeiten.

Industry & production halls

Cleanroom technology & medical technology

Building automation

Individual Advice on Your Project:

How Does Volume Flow Measurement via Differential Pressure Work?

Air flows through a defined flow element (e.g. measuring cross, pitot tube or nozzle)
A pressure-dependent resistance is created
A differential pressure transmitter measures the pressure difference upstream and downstream of the element
The volume flow is calculated from this using the known geometry

Energy Efficiency through Differential Pressure Measurement

Precise measurement of the volume flow is the basis for this control. And this is where the differential pressure method scores particularly well:

Direct influence on fan performance

Fans are among the largest power consumers in HVAC systems.
Reducing the volume flow by just 20 % reduces power consumption by around 50 % (cubic law!).

Shorter running times, less wear and tear

Mechanical components are protected
Less maintenance required, longer service life of the systems

Can be combined with intelligent control systems

Integration into building management systems
Control based on set values, time programs or sensors (e.g. CO₂, VOC)

Reduce Costs – Sustainably and Measurably

Advantages	Effects
Save electricity costs	Lower operating costs due to reduced air delivery
Increase filter service life	Less air volume = lower filter load
Eligible for funding as part of energy-saving projects	Government programs support energy-efficient building and ventilation technology
Reduce CO₂ emissions	Less energy consumption means active climate protection

Conclusion: Dynamic Control, Intelligent Savings

With differential pressure-based volume flow measurement, variable volume flows can be controlled precisely and stably. This reduces energy costs, increases system availability and at the same time meets all air quality and hygiene requirements. The investment in this technology pays off - both technically and economically.