Heat Exchange

Chapter 17.1

Lesson ObjectivesExplain how energy in and from the atmosphere

is distributed:RadiationConduction Convection

Solar FundamentalsThe sun is the source of all of the energy in the

atmosphere

This energy is transferred to the Earth and throughout the atmosphere by:ConvectionConduction Radiation

Heat TransferConvection

The transfer of energy by the flow of a heated substance

Responsible for the vertical motions of air, which causes different types of weather

Works based on density

Daytime Convection • Due to energy received from the

sun • Air around us gets warmer• Becomes less dense and

rises up• The cool air moves from the

sea to replace the warm air

Night time ConvectionAt night, the

reverse happens. The sea will be warmer than the land. Land cools quickly. Warmer air rises above the land and the cooler air replaced the same.

Heat TransferConduction

Transfer of energy that occurs when molecules collide

Affects only a very thin atmospheric layer near Earth’s surface

Heat Transfer

RadiationTransfer of energy

through space by visible light, UV radiation and other forms of electromagnetic waves

Earth’s surface absorbs the solar radiation and then radiates energy with longer wavelengths, which warm the atmosphere through convection and conduction

Renewable Energy Source Renewables are a naturally

occurring source of energy that do not come from a fossil or nuclear based fuel. 

The suns rays are turned into renewable energy in both indirect and direct manners.

Indirect Energy Source Indirectly, solar radiation

influences the Earth's water, air current, and photosynthesis cycles 

These cycles are used to generate hydro, wind and wave, and bioenergy respectively.

Direct Energy Source Directly, solar radiation can be turned to electricity, as well

as absorbed for heating