You as a Biochemical Engineer in an ezyme industries is assigned to handle a counterflow double pipe heat exchanger with A,= 9 m2 which used for cooling a fermentationbroth (c, = 3.15 kJ/kg. K) at a rate of 10 kg/s with an inlet temperature of 90°C. Thewater used as coolant enters the heat exchanger at a rate of 8 kg/s with an inlettemperature of 10°C. The plant data gave the following equation for the overall heattransfer coefficient (in W/m².K):600%3D12• U.8|m.wherem.and m, are the cold and hot stream flow rates in kg/s, respectively. (b) The existing unit is to be replaced. A vendor is offering a very attractive discounton two identical heat exchangers that are presently stocked in its warehouse, eachwith 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 vendor is 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 together 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 replacem ent proposal.Compare perform ance of both heat exchanger.

Drawing the diagram of heat exchangers,

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):

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):

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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Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

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.

(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 manner, 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 replacem ent proposal.
Compare perform ance of both heat exchanger.

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3.36 Both C's in a parallel-flow heat exchanger are equal to 156 W/K, U 327 W/m²K and A = 2 m². The hot fluid enters at 140°C and leaves at 90°C. The cold fluid enters at 40°C. If both C's are halved, what will be the exit temperature of the hot fluid?