Calculate sensible or latent heat exchanger duty, outlet temperature, or required flow with SI and imperial units, capacity rate, and detailed energy-balance steps.

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Heat Exchanger Duty Formula

The following two example problems outline the steps and information needed to calculate the Heat Exchanger Duty.

HED = M × LH

Variables:

  • HED is the Heat Exchanger Duty (kW)
  • M is the fluid mass flow rate through the exchanger (kg/s) 
  • LH is the latent heat (kJ/kg) 

To calculate heat exchanger duty, multiply the fluidmass flow rate by the latent heat.

How to Calculate Heat Exchanger Duty?

The following steps outline how to calculate the Heat Exchanger Duty.

  1. First, determine the fluid mass flow rate through the exchanger (kg/s). 
  2. Next, determine the latent heat (kJ/kg). 
  3. Next, gather the formula from above = HED = M * LH.
  4. Finally, calculate the Heat Exchanger Duty.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

fluid mass flow rate through the exchanger (kg/s) = 75

latent heat (kJ/kg) = 100

HED = M * LH = ?