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This passive cooling strategy is most effective when earth temperatures are cooler than ambient air temperature, such as in hot climates. Direct coupling or earth sheltering occurs when a building uses earth as a buffer for the walls. The earth acts as a heat sink and can effectively mitigate temperature extremes.
A heat sink (also commonly spelled heatsink, [1]) is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant, where it is dissipated away from the device, thereby allowing regulation of the device's temperature.
While a heat sink is a static object, a fan often aids a heat sink by providing increased airflow over the heat sink—thus maintaining a larger temperature gradient by replacing the warmed air more quickly than passive convection achieves alone—this is known as a forced-air system.
A finned air cooled heatsink with fan clipped onto a CPU, with a smaller passive heatsink without fan in the background A 3-fan heatsink mounted on a video card to maximize cooling efficiency of the GPU and surrounding components Commodore 128DCR computer's switch-mode power supply, with a user-installed 60 mm cooling fan.
A heat sink (aluminium) with heat pipes (copper) Typical heat pipe configuration within a consumer laptop. The heat pipes conduct waste heat away from the CPU, GPU and voltage regulators, transferring it to a heatsink coupled with a cooling fan that acts as a fluid-to-fluid heat exchanger.
The average cooling potential of tropical climates varies between 10 and 40 W m 2, significantly lower than hot and dry climates. [5] For example, the cooling potential of most of southeast Asia and the Indian subcontinent is significantly diminished in the summer due to a dramatic increase in humidity, dropping as low as 10–30 W/m 2.
Radiative cooling thus offers potential for passive cooling for residential and commercial buildings. [5] Traditional building surfaces, such as paint coatings, brick and concrete have high emittances of up to 0.96. [26] They radiate heat into the sky to passively cool buildings at night.
A cooling system can do this using an active cooling method (e.g. conduction coupled with forced convection) such as a heat sink with a fan, or any of the two passive cooling methods: thermal radiation or conduction. Typically, a combination of these methods is used.
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