The emissivity coefficient - ε - indicates the radiation of heat from a body according the Stefan-Boltzmann Law, compared with the radiation of heat from a ideal black body where the emissivity coefficient ε = 1.
Emissivity coefficients - ε - for some common material surfaces:
- ε -
|Water (0 - 100oC)||0.95 - 0.963|
|Ice||0.96 - 0.99|
|Snow||0.96 - 0.98|
|Green Grass||0.975 - 0.986|
Heat loss from pipes, tubes and tanks - with and without insulation - foam, fiberglass, rockwool and more.
Steam and condensate pipes - heat loss uninsulated and insulated pipes, insulation thickness and more.
Heat transfer and heat loss from buildings and technical applications - heat transfer coefficients and insulation methods to reduce energy consumption.
Material properties of gases, fluids and solids - densities, specific heats, viscosities and more.
Work, heat and energy systems.
Solar radiation absorbed by various materials.
Radiation heat emissivity of unoxidized, oxidized and polished aluminum.
The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for a material.
Walls or heat exchangers - calculate overall heat transfer coefficients.
Heat loss vs. surface temperature.
Heat transfer due to emission of electromagnetic waves is known as thermal radiation.
Solar heat gain through windows with roller shades, vertical blinds and Venetian blinds
Daily surface energy from solar radiation.
The radiation heat transfer emissivity coefficients for some common materials like aluminum, brass, glass and many more.
Radiation surface absorptivity.