 | Cooling | Heating |
|---|---|---|
| Heat Transfer | Heat is transferred away from the zone of interest | Heat is transferred into the zone of interest |
| Common Devices | Metal coils filled with convective liquid, sometimes blown over by air, sometimes breezed over by ambient circulation | Flame, electrically excited metal stripping, ... |
| Mode 1 of Heat Transfer: Conduction | Only within liquid-to-liquid, and metal-to-metal | Greatly within metal stripping |
| Mode 2 of Heat Transfer: Convection | Greatly by dynamic flow of liquids, and even more greatly by flow of gaseous air and other elements | Greatly within flame, and greatly within bodies of gaseous blends of elements mixed with ambient atmospheric air |
| Mode 3 of Heat Transfer: Radiant Heating | Not applicable | Infrared absorption of solids and liquids primarily, when exposed to sunlight, especially at higher elevations, where solar heating is not much blocked by blankets of warmed air, which would be radiantly attenuative of infrared radiation from sunligh |
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