Absorptivity and Net Radiation Heat Transfer


α =

The fraction of the incident radiation energy that is absorbed by a surface. Blackbody: α = 1
Real Surfaces: 0 <α< 1
For this course we will always assume α = 1

Net heat transfer rate:
Net heat transfer rate


Stefan-Boltzmann Law
Stefan-Boltzmann Law for the surroundings
Net heat transfer rate between the system and the surroundings.
Large enclosure
Gray body
Small Gray Body
ε, α, A, TS
Large Enclosure
Roll your mouse over this box to close.
Join Learn Thermodynamics Advantage
  • Download Data Tables
  • Download Study Aids
  • Homework problem hints and answers
  • Get Help from Dr. B in the LT Blog
  • 120 day membership

Get it ALL for $5 US

Ch 4, Lesson B, Page 23 - Absorptivity and Net Radiation Heat Transfer