But although the mantle plume theory of heat convection is widely accepted, " there is no direct evidence for the existence of plumes, " according to Dr . Michael E . Wysession of Washington University in St . Louis, a leading geophysicist.
12.
True geothermal heat, when used for heating, requires a circulation pump but no heat pump, since for this technology the ground temperature is higher than that of the space that is to be heated, so the technology relies only upon simple heat convection.
13.
The movement of a handheld fan provides cooling by increasing the airflow over the skin, which in turn increases the evaporation rate of sweat droplets on the skin, and increasing heat convection by displacing the warmer air, produced by body heat, that surrounds the skin.
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