ANS:C - < 1

For a multipass shell and tube heat exchanger, the Log Mean Temperature Difference (LMTD) correction factor can vary depending on the specific configuration and operating conditions. It is not always a constant value. The correct answer is between 1 & 2. Explanation:

• The LMTD correction factor, also known as the correction factor for multipass exchangers (F), adjusts the LMTD calculation to account for the multiple passes of fluids in the heat exchanger.
• This correction factor depends on factors such as the number of shell and tube passes, the flow arrangement (e.g., parallel or counterflow), and the geometry of the heat exchanger.
• The correction factor can be greater than 1, less than 1, or between 1 and 2, depending on the specific design and operating conditions of the multipass heat exchanger.
• It is used to modify the standard LMTD formula to accurately predict the heat transfer performance of multipass heat exchangers.
• Therefore, the LMTD correction factor for a multipass shell and tube heat exchanger is not always a constant value but can vary based on the aforementioned factors.