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In a gas-fired boiler, water is bein cm-diameter tube submerged in velocity of 7.5 m/s, and leaves determine the ou 200

In a gas-fired boiler, water is bein cm-diameter tube submerged in velocity of 7.5 m/s, and leaves determine the ou 200

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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Parvinbhai 

4- In a gas-fired boiler, water is being boiled at 120°C by hot air flowing through a 6-m-long, 5- cm-diameter tube submerged in water. Hot air enters the tube at 1 atm and 350°℃ at a mean velocity of 7.5 m/s, and leaves at 150°C. If the surface temperature of the tube is 120°C, determine the average convection heat transfer coefficient of the air and the rate of water evaporation, in kg/h. Tip: To find the density of air, use the bulk mean temperature. Find hfg of water and the enthalpy of air at the inlet and exit from thermodynamic tables. Boiler Water Vent rima Hot air || || 120°C
Transcribed Image Text:4- In a gas-fired boiler, water is being boiled at 120°C by hot air flowing through a 6-m-long, 5- cm-diameter tube submerged in water. Hot air enters the tube at 1 atm and 350°℃ at a mean velocity of 7.5 m/s, and leaves at 150°C. If the surface temperature of the tube is 120°C, determine the average convection heat transfer coefficient of the air and the rate of water evaporation, in kg/h. Tip: To find the density of air, use the bulk mean temperature. Find hfg of water and the enthalpy of air at the inlet and exit from thermodynamic tables. Boiler Water Vent rima Hot air || || 120°C
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