Q1: For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it

ANS:C - increases the overall heat transfer coefficient.

The correct answer is: c) increases the overall heat transfer coefficient. When employing a multipass arrangement on the tube side of a shell and tube heat exchanger, it increases the overall heat transfer coefficient. This occurs because multipass configurations allow for increased velocity and turbulence within the tubes, enhancing heat transfer between the fluid inside the tubes and the fluid outside the tubes. As a result, the overall heat transfer coefficient increases, leading to more efficient heat transfer between the two fluid streams. While multipass arrangements may also affect pressure drop and outlet temperature, the primary advantage is typically associated with the enhancement of heat transfer coefficient.