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
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
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.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.48P: A horizontal, 3-mm-thick flat-copper plate, 1-m long and 0.5-m wide, is exposed in air at 27C to...
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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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fef604010-6a96-44b8-bfff-64c76c9e43ef%2Feda66081-59b0-4d9d-a2ca-f26003eb80ff%2Fbeh48x_processed.jpeg&w=3840&q=75)
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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