Thermal Energy and Flow measurement at an Airport

Thermal Energy and Flow measurement at an Airport

When operating a complex energy supply system such as the power supply at Munich Airport, very high demands are placed on availability, security and efficiency. Technical management lies in the hands of the plant operator in the control room of the power supply centre.
The measured values of the current thermal output recorded by FLUXUS are among the data processed by the process control system. Heat is distributed throughout the airport by means of a district heating network with a total length of approximately 18 kilometres, which is partially embedded in the ground and partially in underground, accessible tunnel systems. In order to be able to display the current network utilisation at any time, the flow rate or the heat flow rate must be measured at the main lines.

Non-invasive heat flow measurement with FLUXUS proved to be the ideal solution:
An airport never sleeps – for this reason, the main supply lines cannot be simply blocked off in order to install a measuring device. This is not a problem for non-invasive thermal energy measurement with FLUXUS: The clamp-on transducers are simply attached to the outside of the pipe. Clamp-on Pt100 sensors measure the temperature in the supply and return lines. Non-invasive, ultrasonic flow measurement takes place via the transit-time difference method in the return line. The FLUXUS flowmeter calculates the energy flow from the measured values. Using the accumulation function integrated in the measuring transducer, the FLUXUS flowmeter can also be used as an energy meter.

The airports measurement technology experts came up with the idea of replacing old, permanently installed electromagnetic inductive flowmeters (which no longer provided reliable measurement values due to coating formations) with non-invasive, ultrasonic measurement technology after positive experiences with the portable ultrasonic FLUXUS F601 flowmeter. Permanently installed FLUXUS flowmeters now measure the heat flow rates on a multitude of heating water main lines and sublines within the various terminals.

The control rooms are always well-informed of the current operating situation due to the heat flow measurements. The values recorded provide a database for determining the current network capacity requirements and therefore also a basis for planning any later increases in capacity.


  • Reliable, non-invasive recording of thermal energy (BTU) flows
  • Practically wear-free measurement without measurement drift, unaffected by potential coating formations
  • Works independently of the conductivity of the medium
  • Simple set-up of measuring points without any interruption of operation
  • Minimum installation effort
  • Compact measurement system, can also be easily installed on measuring points which are difficult to access
  • Maximum flexibility with the portable measuring system

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