You as an Engineer in an ezyme industries is assigned to handle a counter flow double pipe heat exchanger with A = 9 m? which used for cooling a fementationbroth (= 3.15 kJkg. K) at a rate of 10 kg/s...

Extracted text: You as an Engineer in an ezyme industries is assigned to handle a counter flow double pipe heat exchanger with A = 9 m? which used for cooling a fementationbroth (= 3.15 kJkg. K) at a rate of 10 kg/s with an inlet temperature of 90°C. The water used as coolant enters the heat exchanger at a rate of 8 kg/s with an inlet temperature of 10°C. The plant data gave the following equation for the overall heat transfer coefficient (in W/m2 K): 600 U = 1 (m. where m, and m, are the cold and hot stream flow rates in kg/s, respectively. (a) The existing unit is to be replaced. A vendor is offering a very attractive discount on two identical heat exchan gers that are presently sto cked in its warehouse, each with area of 5.5 m? Because the tube diameters in the existing and new units are the same, the above heat transfer coefficient equation is expected to be valid for the new units as well. The vendoris proposing that the two new units could be operated in parallel, such that each unit would process exactly one-half the flow rate of each of the hot and cold streams in a counterflow manner, hence, they to gether would meet (or exceed) the present plant heat duty. Draw a complete schematic diagram of the new heat exchangers. Suggest what should be the diameter and length. Give your recommendation, with supporting calculations on this replacement proposal. Compare performance of both heat exchanger.