In a counter flow heat exchanger hot fluid enters at 100°C and leaves at 50°C

Q. In a counter flow heat exchanger, hot fluid enters at 100°C and leaves at 50°C. Cold fluid enters at 30°C and leaves at 40°C. If heat losses are ignored, then the logarithmic mean temperature difference (LMTD) is °C (round off to 1 decimal place).

Ans: 35-38

Sol:

Using the equation LMTD =