Water enters at 20 ℃ at a rate of 0.1 kg/s in a double-pipe counter flow heat exchanger is to be heated by hot air that enters the heat exchanger at 90 ℃ at a rate of 0.3 kg/s. The overall heat transfer coefficient based on the inner side of the tube to be 100 W/m2. ℃. The length of the tube is 14 m and the internal diameter of the tube is 1.4 cm. Determine the outlet temperature of the air. The specific heats of the water and air are given to be 4.18 and 1.01 kJ/kg.℃, respectively.Select one:a. 82.6 ℃b. 74.7 ℃c. 72.5 ℃d. 77.9 ℃ Water enters at 20 °C at a rate of 0.1 kg/s ina double-pipe counter flow heat exchangeris to be heated by hot air that enters the heatexchanger at 90 °C at a rate of 0.3 kg/s. Theoverall heat transfer coefficient based on theinner side of the tube to be 100 W/m2. °C.The length of the tube is 14 m and the internaldiameter of the tube is 1.4 cm. Determine theoutlet temperature of the air. The specific heatsof the water and air are given to be 4.18 and1.01 kJ/kg.°C, respectively.Select one:a. 82.6 °Cb. 74.7 °Cc. 72.5 °Cd. 77.9 °C

We have to determine outlet temperatures of air

Answered: air that enters the heat exchanger at…

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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Water enters at 20 ℃ at a rate of 0.1 kg/s in a double-pipe counter flow heat exchanger is to be heated by hot air that enters the heat exchanger at 90 ℃ at a rate of 0.3 kg/s. The overall heat transfer coefficient based on the inner side of the tube to be 100 W/m2. ℃. The length of the tube is 14 m and the internal diameter of the tube is 1.4 cm. Determine the outlet temperature of the air. The specific heats of the water and air are given to be 4.18 and 1.01 kJ/kg.℃, respectively. Select one: a. 82.6 ℃ b. 74.7 ℃ c. 72.5 ℃ d. 77.9 ℃

Water enters at 20 °C at a rate of 0.1 kg/s in
a double-pipe counter flow heat exchanger
is to be heated by hot air that enters the heat
exchanger at 90 °C at a rate of 0.3 kg/s. The
overall heat transfer coefficient based on the
inner side of the tube to be 100 W/m2. °C.
The length of the tube is 14 m and the internal
diameter of the tube is 1.4 cm. Determine the
outlet temperature of the air. The specific heats
of the water and air are given to be 4.18 and
1.01 kJ/kg.°C, respectively.
Select one:
a. 82.6 °C
b. 74.7 °C
c. 72.5 °C
d. 77.9 °C

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