The production line of a special biscuit at 30°C and 1 atm has a 0.8 X 0.8 (m) square plate. One side of the plate is maintained at a temperature of 100°C, while the other side is insulated. What is the film temperature? Determine the rate of heat transfer from the plate by natural convection if the plate Is horizontal with the hot surface facing down; Is horizontal with the hot surface facing up; Suggest the best design for better heat transfer and justify your suggestion. Data: The properties of air at the film temperature are: thermal conductivity, k= 0.0279 W/m.k); kinematic viscosity= 1.815 x 10° m?/s; Pr = 0.709 The plate will also lose heat to the surroundings by radiation. i) Calculate the radiation heat transfer and the total heat transfer for th horizontal design with the hot surface facing up. Assume that the plate has an emissivity of ɛ=0.95 and the inner surfaces of the walls of the production line are at room temperature.
The production line of a special biscuit at 30°C and 1 atm has a 0.8 X 0.8 (m) square plate. One side of the plate is maintained at a temperature of 100°C, while the other side is insulated. What is the film temperature? Determine the rate of heat transfer from the plate by natural convection if the plate Is horizontal with the hot surface facing down; Is horizontal with the hot surface facing up; Suggest the best design for better heat transfer and justify your suggestion. Data: The properties of air at the film temperature are: thermal conductivity, k= 0.0279 W/m.k); kinematic viscosity= 1.815 x 10° m?/s; Pr = 0.709 The plate will also lose heat to the surroundings by radiation. i) Calculate the radiation heat transfer and the total heat transfer for th horizontal design with the hot surface facing up. Assume that the plate has an emissivity of ɛ=0.95 and the inner surfaces of the walls of the production line are at room temperature.
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.
Chapter11: Heat Transfer By Radiation
Section: Chapter Questions
Problem 11.48P
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question in image need help with part c only
Transcribed Image Text:(a) The production line of a special biscuit at 30°C and 1 atm has a 0.8 X 0.8 (m)
square plate. One side of the plate is maintained at a temperature of 100°C,
while the other side is insulated.
What is the film temperature?
(b) Determine the rate of heat transfer from the plate by natural convection if the
plate
Is horizontal with the hot surface facing down;
Is horizontal with the hot surface facing up;
Suggest the best design for better heat transfer and justify your
suggestion.
Data: The properties of air at the film temperature are: thermal conductivity, k=
0.0279 W/m.k); kinematic viscosity= 1.815 x 10° m?/s; Pr = 0.709
(c) The plate will also lose heat to the surroundings by radiation.
i)
Calculate the radiation heat transfer and the total heat transfer for the
horizontal design with the hot surface facing up.
Assume that the plate has an emissivity of ɛ=0.95 and the inner surfaces of the
walls of the production line are at room temperature.
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