You as an Engineer in an ezyme industries is assigned to handle a counter flow doublepipe 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 usedas coolant enters the heat exchanger at a rate of 8 kg/s with an inlet temperature of10°C. The plant data gave the following equation for the overall heat transfercoefficient (in W/m2 K):600U =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 attractivediscount on two identical heat exchan gers that are presently sto cked in itswarehouse, each with area of 5.5 m?Because the tube diameters in the existing and new units are the same, the aboveheat 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, suchthat each unit would process exactly one-half the flow rate of each of the hot andcold 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 heatexchangers. Suggest what should be the diameter and length. Give yourrecommendation, with supporting calculations on this replacement proposal.Compare performance of both heat exchanger.

Detail diagram of heat exchanger

Answered: mperature of 90°0 The water used 3 kg/s…

Engineering

Mechanical Engineering

mperature of 90°0 The water used 3 kg/s with an inlet temperature of ation for the overall heat transfer

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.18P

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