What is the efficiency of a heat exchanger?

The heat exchanger efficiency is defined as the ratio of the heat transferred in the actual heat exchanger to the heat that would be transferred in the ideal heat exchanger. The concept of heat exchanger efficiency provides a new way for the design and analysis of heat exchangers and heat exchanger networks.

How was the efficiency of a heat exchanger increased?

Heat transfer coefficient, pressure drop, baffles and fouling are responsible for the efficiency of the heat exchanger. By increasing the flow resistance the heat transfer rate can be increased by creating the turbulence in the shell side of the heat exchanger.

Which heat exchanger is more efficient and why?

Counter flow heat exchangers are inherently more efficient than parallel flow heat exchangers because they create a more uniform temperature difference between the fluids, over the entire length of the fluid path.

Which is ideal for heat transfer in heat exchanger?

Heat exchangers all work by passing a hot fluid and a cold fluid across opposite sides of a piece of metal. High fluid velocity, high turbulence, high surface area and a large temperature differential all contribute to more efficient heat transfer. …

How do you measure the efficiency of a heat exchanger?

Heat exchanger effectiveness You can compare the current heat transfer rate to the original (rated) heat transfer rate. A ratio of (Q/rated duty) will tell you how effectively your exchanger is working.

How do you calculate heat exchanger performance?


  1. The main basic Heat Exchanger equation is: Q = U x A x ΔTm =
  2. The log mean temperature difference ΔTm is: ΔTm =
  3. (T1 – t2) – (T2 – t1) = °F.
  4. T1 = Inlet tube side fluid temperature; t2 = Outlet shell side fluid temperature;
  5. ln (T1 – t2) (T2 – t1)