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In a parallel-flow, liquid-to-liquid heat exchanger, the inlet and outlet temperatures of the hot fluid are 150ºC and 90ºC while that of the cold fluid are 30ºC and 70ºC, respectively. For the same overall heat transfer coefficient, the percentage decrease in the surface area of the heat exchanger if counter-flow arrangement is used is   a. 24.6% b. 19.7% c. 9.7% d. 3.9%       e. 14.5%

In a parallel-flow, liquid-to-liquid heat exchanger, the inlet and outlet temperatures of the hot fluid are 150ºC and 90ºC while that of the cold fluid are 30ºC and 70ºC, respectively. For the same overall heat transfer coefficient, the percentage decrease in the surface area of the heat exchanger if counter-flow arrangement is used is   a. 24.6% b. 19.7% c. 9.7% d. 3.9%       e. 14.5%

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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 In a parallel-flow, liquid-to-liquid heat exchanger, the inlet and outlet temperatures of the hot fluid are 150ºC and 90ºC while that of the cold fluid are 30ºC and 70ºC, respectively. For the same overall heat transfer coefficient, the percentage decrease in the surface area of the heat exchanger if counter-flow arrangement is used is


 

a.

24.6%

b.

19.7%

c.

9.7%

d.

3.9%      

e.

14.5%

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