Water enters at 20 ℃ at a rate of 0.2 kg/s in a double-pipe parallel flow heat exchanger is to be heated to 70 ℃ by geothermal water that enters the heat exchanger at 155 ℃ at a rate of 0.3 kg/s. The overall heat transfer coefficient of the heat exchanger is 500 W/m2. ℃. The internal diameter of the tube is 1.2 cm. Determine the length of the heat exchanger. The specific heats of the water and geothermal water are given to be 4.18 and 4.31 kJ/kg.℃, respectively. Select one: a. 25.4 m b. 30.5 m c. 20.7 m d. 27.5 m

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Water enters at 20 ℃ at a rate of 0.2 kg/s in a double-pipe parallel flow heat exchanger is to be heated to 70 ℃ by geothermal water that enters the heat exchanger at 155 ℃ at a rate of 0.3 kg/s. The overall heat transfer coefficient of the heat exchanger is 500 W/m2. ℃. The internal diameter of the tube is 1.2 cm. Determine the length of the heat exchanger. The specific heats of the water and geothermal water are given to be 4.18 and 4.31 kJ/kg.℃, respectively. Select one: a. 25.4 m b. 30.5 m c. 20.7 m d. 27.5 m
Water enters at 20 °C at a rate of 0.2 kg/s
in a double-pipe parallel flow heat
exchanger is to be heated to 70 °C by
geothermal water that enters the heat
exchanger at 155 °C at a rate of 0.3 kg/s.
The overall heat transfer coefficient of
the heat exchanger is 500 W/m2. °C. The
internal diameter of the tube is 1.2 cm.
Determine the length of the heat
exchanger. The specific heats of the
water and geothermal water are given to
be 4.18 and 4.31 kJ/kg.°C, respectively.
Select one:
a. 25.4 m
b. 30.5 m
c. 20.7 m
d. 27.5 m
1:10 am
Transcribed Image Text:Water enters at 20 °C at a rate of 0.2 kg/s in a double-pipe parallel flow heat exchanger is to be heated to 70 °C by geothermal water that enters the heat exchanger at 155 °C at a rate of 0.3 kg/s. The overall heat transfer coefficient of the heat exchanger is 500 W/m2. °C. The internal diameter of the tube is 1.2 cm. Determine the length of the heat exchanger. The specific heats of the water and geothermal water are given to be 4.18 and 4.31 kJ/kg.°C, respectively. Select one: a. 25.4 m b. 30.5 m c. 20.7 m d. 27.5 m 1:10 am
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