1. Consider an opaque horizontal plate that is well insulated on its backside. The irradiation on the plate is 3000 W/m², of which 600 W/m² is reflected. The plate is at 150°C and has an emissivity of 0.5. Air at 30°C flows over the plate with a heat transfer convection coefficient of 20 W/m²K.

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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1. Consider an opaque horizontal plate that is well insulated on its backside. The
irradiation on the
plate is 3000 W/m2, of which 600 W/m² is reflected. The plate is at 150°C and has an
emissivity
of 0.5. Air at 30°C flows over the plate with a heat transfer convection coefficient of
20 W/m²K.
Answer questions 1.1 to 1.3:
Question 1
1.1) Determine the absorptivity of the plate:
0.8
Correct
Question 2
1.2) Determine the net radioactive flux from the plate, W/m².
1,507.64
Wrong
Question 3
1.3) What is the net heat transfer rate per unit area, W/m²?
307.64
Wrong
Transcribed Image Text:Incorrect Incorrect 1. Consider an opaque horizontal plate that is well insulated on its backside. The irradiation on the plate is 3000 W/m2, of which 600 W/m² is reflected. The plate is at 150°C and has an emissivity of 0.5. Air at 30°C flows over the plate with a heat transfer convection coefficient of 20 W/m²K. Answer questions 1.1 to 1.3: Question 1 1.1) Determine the absorptivity of the plate: 0.8 Correct Question 2 1.2) Determine the net radioactive flux from the plate, W/m². 1,507.64 Wrong Question 3 1.3) What is the net heat transfer rate per unit area, W/m²? 307.64 Wrong
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