Energy costs (Ce)

Energy consumption is most often the largest component in the calculation of the life cycle cost for a pumping system. In commercial buildings, pumps often run more than 2000 hours a year.

Many factors influence the energy consumption of a pump system:

  • Load profile
  • Use of speed-controlled solutions
  • Pump efficiency (calculation of duty point should be carried out carefully)
  • Motor efficiency (the motor efficiency at partial load can vary significantly between high-efficiency motors and normal-efficiency motors)
  • Pump sizing (safety margins and rounded numbers tend to result in oversized pumps)
  • Other system components, such as pipes and valves

Load profile of circulation systems in commercial building systems.