Heat Exchangers

Use to estimate water loads and flows for heat exchangers

Water flow rate, from heat load and temperature difference

Water Heat Load kw
Temperature In °C
Temperature Out °C
Water Flow Rate kg/s

Water heat load, from flow rate and temperature difference

Water Flow Rate kg/s
Temperature In °C
Temperature Out °C
Water Heat Load kw
Notes
  • Domestic hot water system, normal temperatures; flow 65°C, return 50 °C minimum, cold make up 10 °C
  • Low temperature hot water system, normal temperatures; flow 82°C, return 71°C
  • Medium temperature hot water system, normal temperatures; flow 120°C, return 90°C
  • Heat load/flow rate calculated is a simple theoretical figure and does not take into account standing losses, scaling, other inefficiencies or variables which may need to be considered depending on application


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