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Glossary

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A I B I C I D I E I F I G I H I I I J I K I L I M I N

O I P I Q I R I S I T I U I V I W I X I Y I Z

 

Emissivity

The measure of the ability of a surface to emit radiant energy compared to that of a black body of identical area at the same temperature. The range of unitless values vary from 0.0 (no emittance) to 1.0 (identical to black body; ideal maximum).

 

Enthalpy

Also known as total heat, this term refers to the sum of both sensible and latent heat in the air.

I-P units: Btu/lb (of dry air)

 

Evaporative cooling

Refers to a constant-enthalpy process in which the addition of latent heat is offset by the removal of an identical amount of sensible heat from the air.

 

Evapotranspiration

The loss of water via evaporation from soil and the transpiration from vegetation.

 

 

 

 

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