In a quenching process, a copper plate of 3 mm thick is heated up to 350°C and then suddenly, it is dropped into a water bath at 25°C. (a) Calculate the time required for the plate to reach the temperature of 50°C. The heat transfer coefficient on the surface of the plate is 28 W/m2 -K. The plate dimensions may be taken as length 40 cm and width 30 cm. (b) Also calculate the time required for infinite long plate to cool to 50°C. Other parameters remain same. (c) Calculate the heat transfer rate loss of the plate when it is at 50°C. Take the properties of copper as: CP = 380 J/kg-K, ρ = 8800 kg/m3 , k = 385 W/m-K
In a quenching process, a copper plate of 3 mm thick is heated up to 350°C and then suddenly, it is dropped into a water bath at 25°C. (a) Calculate the time required for the plate to reach the temperature of 50°C. The heat transfer coefficient on the surface of the plate is 28 W/m2 -K. The plate dimensions may be taken as length 40 cm and width 30 cm. (b) Also calculate the time required for infinite long plate to cool to 50°C. Other parameters remain same. (c) Calculate the heat transfer rate loss of the plate when it is at 50°C. Take the properties of copper as: CP = 380 J/kg-K, ρ = 8800 kg/m3 , k = 385 W/m-K
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter3: Transient Heat Conduction
Section: Chapter Questions
Problem 3.16P: 3.16 A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer...
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In a quenching process, a copper plate of 3 mm thick is heated up to 350°C and then suddenly, it is dropped into a water bath at 25°C.
(a) Calculate the time required for the plate to reach the
temperature of 50°C. The heat transfer coefficient on the surface of the plate is 28 W/m2 -K. The plate dimensions may be taken as length 40 cm and width 30 cm.
(b) Also calculate the time required for infinite long plate to cool to 50°C. Other parameters remain same.
(c) Calculate the heat transfer rate loss of the plate when it is at 50°C. Take the properties of copper as: CP = 380 J/kg-K, ρ = 8800 kg/m3 , k = 385 W/m-K
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