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# Radiation - Surface Emissivity Coefficients

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:

MaterialEmissivity Coefficient
- ε -
Water (0 - 100oC) 0.95 - 0.963
Ice 0.96 - 0.99
Snow 0.96 - 0.98
Sand 0.9
Granite 0.96
Green Grass 0.975 - 0.986

## Related Topics

### • Heat Loss and Insulation

Heat loss from pipes, tubes and tanks - with and without insulation. Use of materials lke foam, fiberglass, rockwool and more.

### • Insulation

Calculate heat transfer and heat loss from buildings and technical applications. Heat transfer coefficients and insulation methods available for reduction of energy consumption.

### • Insulation and Heat Loss from Steam and Condesate Pipe Lines

Heat loss from uninsulated and insulated steam and condensate pipes and tanks. Calculate insulation thicknesses.

### • Material Properties

Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.

### • Thermodynamics

Work, heat and energy systems.

## Related Documents

Solar radiation absorbed by various materials.

### Aluminum - Radiation Heat Emissivity

Radiation heat emissivity of unoxidized, oxidized and polished aluminum.

### Building Materials - Radiation Constants

The radiation constant is the product between the Stefan-Boltzmann constant and the emissivity constant for a material.

### Overall Heat Transfer Coefficients

Walls or heat exchangers - calculate overall heat transfer coefficients.

### Pipes - Bare Surface Heat Loss

Heat loss vs. surface temperature.

Heat transfer due to emission of electromagnetic waves is known as thermal radiation.

### Solar Heat Transmission through Windows

Solar heat gain through windows with roller shades, vertical blinds and Venetian blinds

### Solar Radiation - Daily Surface Energy

Daily surface energy from solar radiation.

### Surface Emissivity Coefficients

The radiation heat transfer emissivity coefficients for some common materials like aluminum, brass, glass and many more.

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