Topic: Heat Transfer
For a specified inlet and outlet temperatures, for which kind of heat exchanger will the log mean temperature difference, $\Delta T_{lm}$ will be highest?
- A. Double pipe parallel flow heat exchanger
- B. Double pipe counter flow heat exchanger
- C. Cross flow heat exchanger
- D. Multi pass shell and tube heat exchanger
Answer: B. Double pipe counter flow heat exchanger
Explanation: For specified inlet and outlet temperatures of hot and cold fluids, the double pipe counter flow heat exchanger provides the highest Log Mean Temperature Difference (LMTD) among all flow arrangements.