The total emissive power of a surface is500 W/(m ^ 2) at a temperature T1, and1200 W/(m ^ 2) at a temperature T2 ,where thetemperatures are in Kelvin. Assume theemissivity of the surface to be constant, find theratio of the temperatures T1/T2.

Givenemissive power E1=500 W/m2 at T1emissive power E2=1200 W/m2 at T2

The total emissive power of a surface is 500 W/(m ^ 2) at a temperature T1, and 1200 W/(m ^ 2) at a temperature T2 ,where th temperatures are in Kelvin. Assume the emissivity of the surface to be constant, find

The total emissive power of a surface is 500 W/(m ^ 2) at a temperature T1, and 1200 W/(m ^ 2) at a temperature T2 ,where th temperatures are in Kelvin. Assume the emissivity of the surface to be constant, find

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 11.33P

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Concept explainers

Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.

Question

The total emissive power of a surface is
500 W/(m ^ 2) at a temperature T1, and
1200 W/(m ^ 2) at a temperature T2 ,where the
temperatures are in Kelvin. Assume the
emissivity of the surface to be constant, find the
ratio of the temperatures T1/T2.

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