Infrastructure and Utilities

Heat, Ventilation and Air Conditioning (HVAC) & District Cooling Plants

Customer challenges

Heat, ventilation and air conditioning (HVAC) systems or district cooling plants are key functions of modern buildings for optimum indoor environmental comfort. The key components of HVAC systems or district cooling plants are chillers, compressors, centrifugal pumps and fans. They are designed for peak load conditions. As they are often not fully loaded, significant energy savings could be achieved by controlling the flow speed. Plant designers often choose variable speed drives (VFDs) as a tool to control the flow speed of the HVAC systems or district cooling plants. However, it is common knowledge that these AC drives are the main source of harmonic currents. Sensitive electrical components operating in erratic environments under harmonic distortions may break down unexpectedly and result in discomfort and costly repairs. High harmonic currents can also jeopardize the reliable operation of emergency diesel gensets.



  • Chillers and fans fed with Variable Speed Drives (VSDs)
  • Compressors with Variable Frequency Drives (VFDs)
  • Pumps with Variable Speed Drives (VSDs)

Customer benefits

The key benefits of improving power quality in HVAC systems or district cooling plants include:

  • Optimum environmental comfort
  • No risk of nuisance tripping
  • Smooth operation and low energy losses
  • Reduced maintenance costs
  • Long lifetime of plant equipment
  • Compliance with IEEE-519, G5/4, IEC61000 3-2, 3-4 and other power quality standards and recommendations

Our success stories from infrastructure and utilities

More Infrastructure and Utilities with Merus Power solutions