Convection: liquids and gases transfer heat this way --> motion of the medium between regions of different temperatures.
Fireplaces --> produce natural convection --> warm air rises and is replaced by cold air
Most space heating systems operate via convective heat transfer (forced air)
Thermal Radiation:
Was effectively used centuries ago in American Southwest (Mesa Verde).
Sandstone dwellings and walls would absorb much sunlight during the day and then re-radiate that as heat at night.
In general, recovering incident solar radiation via subsequent thermal radiation of materials is not practical
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