Methods of Heat Transfer: Radiation

Radiant energy seems to magically jump from a warmer surface to a cooler surface without changing the temperature of the space in between. Yet, the impact of radiation on thermal comfort and the energy load of buildings in cooling climates is no secret. This lesson demystifies radiation and explains how radiant heat sources can be managed to improve thermal comfort.

Learning Objectives

At the conclusion of this lesson, you will be able to:

• Differentiate radiation from other methods of heat transfer
• Explain the significance of reducing solar heat gains
• Define emissivity and its relationship to heat gain through windows
• Describe how radiant barriers work

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