Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 24 Oct 2017 My Price 4.00

use of condensing steam

7.90   A preheater involves the use of condensing steam at 100°C on the inside of a bank of tubes to heat air that enters at 1 atm and 25°C. The air moves at 5 m/s in cross flow over the tubes. Each tube is 1 m long and has an outside diameter of 10 mm. The bank consists of 196 tubes in a square, aligned array for which ST = SL = 15 mm. What is the total rate of heat trans- fer to the air? What is the pressure drop associated with the airflow?

7.91   Consider the  in-line  tube  bank  of  Problem  7.90 (D = 10 mm, L = 1 m, and ST = SL = 15 mm), with condensing steam used to heat atmospheric air entering the tube bank at Ti = 25°C and V = 5 m/s. In this case, however, the desired outlet temperature, not the number of tube rows, is known. What is the minimum value of NL needed to achieve an outlet temperature of To > 75°C? What is the corresponding pressure drop across the tube bank?

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Maurice Tutor
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Status NEW Posted 24 Oct 2017 07:10 PM My Price 4.00

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