Hot air for a large scale drying operation is to be produced by routing the air over a tube bank, while products of combustion are routed through the tubes. The surface area of the cross-flow heat exchanger is A = 25 m², and for the proposed operating conditions, the manufacturer specifies and overall heat transfer coefficient of U = 35 W/(m²K). The air and the combustion gases may each be assumed to have a specific heat of cp = 1040 J/(kg K). Consider conditions for which combustion gases flowing at 1 kg/s enter the heat exchanger at 800 K, while air at 5 kg/s has an inlet temperature of 300 K. (a) What are the air and gas outlet temperatures? .

Hot air for a large scale drying operation is to be produced by routing the air over a tube bank, while products of combustion are routed through the tubes. The surface area of the cross-flow heat exchanger is A = 25 m², and for the proposed operating conditions, the manufacturer specifies and overall heat transfer coefficient of U = 35 W/(m²K). The air and the combustion gases may each be assumed to have a specific heat of cp = 1040 J/(kg K). Consider conditions for which combustion gases flowing at 1 kg/s enter the heat exchanger at 800 K, while air at 5 kg/s has an inlet temperature of 300 K. (a) What are the air and gas outlet temperatures? .

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

Hot air for a large scale drying operation is to be produced by routing the air over a tube bank,
while products of combustion are routed through the tubes. The surface area of the cross-flow
heat exchanger is A = 25 m², and for the proposed operating conditions, the manufacturer
specifies and overall heat transfer coefficient of U = 35 W/(m²K). The air and the combustion
gases may each be assumed to have a specific heat of cp = 1040 J/(kg K). Consider conditions
for which combustion gases flowing at 1 kg/s enter the heat exchanger at 800 K, while air at 5
kg/s has an inlet temperature of 300 K.
(a) What are the air and gas outlet temperatures?
(b) Explore the effect of changes in surface area and heat transfer coefficient on the air
outlet temperature for UA values from 500 to 2500 W/K. Discuss the implications
and back up the discussion with an appropriate plot.

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