Question

In a counter flow heat exchanger, hot fluid enters at \(120^\circ\text{C}\) and leaves at \(80^\circ\text{C}\). Cold fluid enters at \(20^\circ\text{C}\) and leaves at \(60^\circ\text{C}\). Find the log mean temperature difference (LMTD).

• A. \(30^\circ\text{C}\)
• B. \(40^\circ\text{C}\)
• C. \(60^\circ\text{C}\)
• D. \(80^\circ\text{C}\)

Hint:

For any heat exchanger, if the temperature differences at both ends are equal ($\Delta T_{1} = \Delta T_{2}$), you do not need to use the logarithmic formula.
The LMTD is simply equal to this common temperature difference value ($\Delta T$).

Answer 1

The Correct Option is C