Cost savings with an efficient HVAC-system at Melbourne Airport

Segment background

Airports are bustling places with significant heat loads generated by numerous sources such as lighting, electronic equipment, and passenger occupancy. Maintaining precise temperature control is vital in airports to ensure the comfort of passengers and employees. Water-cooled chillers offer accurate and reliable temperature control, allowing for adjustments to meet varying cooling requirements based on occupancy, climate conditions, and time of day.

At Melbourne Airport to ensure uninterrupted ventilation, they incorporated redundancy in their HVAC systems, where multiple chillers, hot water boilers, and generators operate in parallel or a standby configuration. This redundancy provides backup ventilation capacity, ensuring continuous operation even if one chiller or boiler requires maintenance or encounters a fault.

Challenges at the customer’s building

HVAC systems used in airports often incorporate large Variable Frequency Drives (VFDs) that can introduce high harmonic currents into the electrical power supply. These harmonic currents are caused by the non-linear characteristics of VFDs, resulting in distorted current waveforms. The presence of these harmonics can lead to various issues, including increased losses, equipment overheating, reduced power factor, voltage distortion, and interference with sensitive equipment. To mitigate these problems, harmonic filters are employed alongside VFDs to reduce or eliminate the harmonic currents.

Our Merus® Solution

An optimal solution was implemented for addressing the harmonic current issue in the system. A Merus® A2-600A Active Harmonic Filter was seamlessly integrated into the common bus connecting all the chillers and boilers. The filter system was designed with six 100A autonomous-operated modules, working in parallel to enhance performance and provide additional redundancy for improved reliability.

Results after installation

As a result of the installation of the Merus® Active Harmonic Filter, the power factor has significantly improved, surpassing 0.98, while effectively maintaining the Total Harmonic Distortion (THDi) below 5%. This comprehensive solution ensures a stable and efficient power supply, mitigates harmonic distortions, and optimizes the overall performance of the HVAC system at the airport.

Segment / Application

Commercial building – airport with HVAC-system



Power quality issue

High current harmonic distortion

Merus® Solution

Customer Benefits

  • Avoiding overheating of the transformer
  • Reduced maintenance costs
  • Longer lifetime of system parts
  • Compliance with IEEE519-2014 power quality standard

With the improved power factor and controlled harmonic distortion, the HVAC system can operate at its optimal performance levels. The active harmonic filter’s ability to maintain power quality within acceptable limits of IEEE519-2014 ensures that the system operates efficiently, maximizing its available capacity and minimizing energy consumption. This leads to cost savings and efficient use of resources.

The Merus® Solution proved to be a valuable investment, ensuring the smooth functioning of the system while meeting power quality standards and promoting energy efficiency in the airport’s infrastructure.

Do you have any questions?

Please contact one of our salespeople with questions and inquiries.

Riku Kalliomaa

Head of Sales,
Regions & Channels

Jaakko Poutamo

Sales Manager,
Energy Storage, Europe

Mikko Zavertkin

Sales Manager,
Key Accounts & OEMs

Viktoria Mansikkala

Sales Manager,
Baltics & Eastern and Southern Europe

Juhani Jaatinen

Senior Sales Manager,
DACH, Benelux, France,

Venkatesh Ramachandra

Regional Sales Manager,
Middle East

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