1. A shell-and-tube heat exchanger operates with two
shell passes and four tube passes. The shell fluid is
ethylene glycol, which enters at 140ºC and leaves at
80ºC with a flow rate of 4500 kg/h. Water flows in the
tubes, entering at 35ºC and leaving at 85ºC. The overall
heat-transfer coefficient for this arrangement is 850
W/m2.ºC. Calculate the flow rate of water required and
the area of the heat exchanger using (a) the LMTD
approach and (b)