Emissivity Emittance

Emissivity, Emittance, Green-Built, North Texas, Glossary, Central Texas, Defines, North Central Texas, Green Buiding, Green Homes, Green Builder, Energy-Efficient Houses

Emissivity 

 

 

 Emissivity is a thermodynamics term. It is The ability of a surface to emit radiant energy compared to that of a black body at the same temperature and with the same area. In simpler words, it is the ability of a material to hold or release heat.

Don’t confuse emissivity with conductivity, however, which is the ability of heat to transfer through a material. Metallic materials have high conductivity but low emissivity when left uncoated. 

For example, three baked potatoes are wrapped in three different materials: aluminum foil, coated aluminum foil, and paper. Both the paper and the coated aluminum foil have high emittance and the potatoes cool more quickly than the potato wrapped in aluminum foil.

Back to glossary

Do you need an energy consultant, energy auditor, 
green builder, or green remodeler
 in North Central Texas 
or the Dallas-Fort Worth area? 
Contact Terry Jensen 
Frugal Energy, LLC
972 251-1532 or 817 443-2553

 

 

Contact
Copyright © 2007-2011 Dallas-Fort Worth Green Building and Renewable Energy. All rights reserved.Reprinted with permission which is not universally given. Please contact DFWGreen Building and Renewable Energy for permission in writing before using thesecopyrighted materials.

Note: The opinions expressedherein are exclusively those of the writers or other participants and do not necessarily reflect theposition of CyberParent,LLC. They are not intended to take the place of advice of ahealth, legal, or other professional whose expertise you might need to seek.This website explains green building and green remodeling for a climate zonecomparable to North Central Texas or Dallas-Fort Worth, Texas,  It isimportant to hire a green builder and an energy consultant who are experts inenergy-efficient building in your climate zone and who use the most up-to-dategreen building information.