Chiller controls are used in manufacturing and services industries. Controls include chiller motor speed and pressure adjustment. Pressure adjustment in chillers is achieved by controlling the number (and/or speed) of fans operating to match demand and ambient conditions.

The variability of loads and conditions must be taken into account when engineering and analysing chiller systems. Significant energy savings can be achieved with system that responds to loads and conditions through the use of fan switching or variable speed fans on condensers. Systems without this flexibility are likely to operate in a maximum output configuration that may only be required a few times a year, resulting in a less efficient process for at most times.

Sectors and common applications

  • Manufacturing
  • Services


  • 63/100
  • Estimated energy savings in 2014 across sectors was 26 PJ/pa.


Indicator Score
1. Energy saving potential  
1.1 Level of energy efficiency 9/15
1.2 Market prospect 2/10
1.3 Energy saving potential 6/10
2. Technical practicality  
2.1 Innovative or advanced nature 15/25
2.2 Reliability 6/10
3. Economic characteristics  
3.1 Investment per unit energy 10/10
3.2 Payback period 10/10
3.3 % of Industry $ gross added value 2/5
4. Social characteristics 3/5


Parmalat Australia Pty Ltd installed a regulator on ammonia compressors and condenser fans to respond to outside air and humidity conditions, reducing load and consumption.

Other companies which have identified chiller controls as a source of energy savings include:

For more information, see:

Chiller fact sheet (PDF, opens in a new window)

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