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(a) Draw complete schematic diagram of this heat exchanger. Calculate the rate of heat transfer and the outlet stream temperature for this unit.

(a) Draw complete schematic diagram of this heat exchanger. Calculate the rate of heat transfer and the outlet stream temperature for this unit.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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You as a Biochemical Engineer in an ezyme industries is assigned to handle a counter flow double pipe heat exchanger with A,= 9 m2 which used for cooling a fermentation broth (c, = 3.15 kJ/kg. 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 %3D 1 2 • U.8 |m. where m. and m, are the cold and hot stream flow rates in kg/s, respectively.
Transcribed Image Text:You as a Biochemical Engineer in an ezyme industries is assigned to handle a counter flow double pipe heat exchanger with A,= 9 m2 which used for cooling a fermentation broth (c, = 3.15 kJ/kg. 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 %3D 1 2 • U.8 |m. where m. and m, are the cold and hot stream flow rates in kg/s, respectively.
(a) Draw complete schem atic diagram of this heat exchanger. Calculate the rate of heat transfer and the outlet stream temperature for this unit. (b) The existing unit is to be replaced. A vendor is offering a very attractive discount on two identical heat exchangers that are presently stocked 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 vendor is 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 m anner, hence, they together 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 perform ance of both heat exchanger.
Transcribed Image Text:(a) Draw complete schem atic diagram of this heat exchanger. Calculate the rate of heat transfer and the outlet stream temperature for this unit. (b) The existing unit is to be replaced. A vendor is offering a very attractive discount on two identical heat exchangers that are presently stocked 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 vendor is 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 m anner, hence, they together 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 perform ance of both heat exchanger.
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