- Introduction
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- Thermal Conduction
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- Thermal Conductivity
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- Convection
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- Radiation
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- Black Body Radiation
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- Stefan Boltzmann law
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- Nature of thermal Radiation
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- Kirchoff's law
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- Newton's Law of Cooling
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- Solved examples

The surface of a body has a emissivity of .55 and area of 1.5 m

Find out the following

a. What rate of heat is radiated from the body if the temperature is 50°C

b. At what rate is radiation absorbed by the radiater when the surrounding temperature is 22°C

c What is the net rate of radiation from the body

Given σ=5.67 *10

a) Rate of radiation radiated=eσAT

b) Rate of radiation absorbed=eσAT

c)Net =Rate of radiation radiated-Rate of radiation absorbed=155 W

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