Cooling water available at 10°C is used to condense steam at 30°C in the condenser of a power plant at a rate of 0.60 kg/s by circulating the cooling water through a bank of 14-m-long 1.2-cm-internal-diameter thin copper tubes. Water enters the tubes at a mean velocity of 4 m/s and leaves at a temperature of 24°C. The tubes are nearly isothermal at 30°C. Determine the average heat transfer coefficient between the water, the tubes, and the number of tubes needed to achieve the indicated heat transfer rate in the condenser. (Round the number of tubes to the next whole number.) The properties of water at the average temperature of (10°C + 24°C)/2 = 17°C are: p = 998.7 kg/m° Cp = 4183.8 J/kg Also, the heat of vaporization of water at 30°C is hfg = 2431 kJ/kg

Cooling water available at 10°C is used to condense steam at 30°C in the condenser of a power plant at a rate of 0.60 kg/s by circulating the cooling water through a bank of 14-m-long 1.2-cm-internal-diameter thin copper tubes. Water enters the tubes at a mean velocity of 4 m/s and leaves at a temperature of 24°C. The tubes are nearly isothermal at 30°C. Determine the average heat transfer coefficient between the water, the tubes, and the number of tubes needed to achieve the indicated heat transfer rate in the condenser. (Round the number of tubes to the next whole number.) The properties of water at the average temperature of (10°C + 24°C)/2 = 17°C are: p = 998.7 kg/m° Cp = 4183.8 J/kg Also, the heat of vaporization of water at 30°C is hfg = 2431 kJ/kg

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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Question

find:

1. The average heat transfer coefficient

2. The number of tubes needed to achieve the indicated heat transfer rate in the condenser

Cooling water available at 10°C is used to condense steam at 30°C in the condenser of a power plant at a rate of 0.60 kg/s by
circulating the cooling water through a bank of 14-m-long 1.2-cm-internal-diameter thin copper tubes. Water enters the tubes at a mean
velocity of 4 m/s and leaves at a temperature of 24°C. The tubes are nearly isothermal at 30°C. Determine the average heat transfer
coefficient between the water, the tubes, and the number of tubes needed to achieve the indicated heat transfer rate in the condenser.
(Round the number of tubes to the next whole number.)
The properties of water at the average temperature of (10°C + 24°C)/2 = 17°C are:
p = 998.7 kg/m³
C, = 4183.8 J/kg
Also, the heat of vaporization of water at 30°C is
hfg
= 2431 kJ/kg

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