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Radiant heat:
(Radiant heating is a technology for heating indoor and outdoor areas. Radiant heating consists of "radiant energy" being emitted from a heat source. Radiant heating heats a building through radiant heat, rather than other conventional methods including convection heating. The technology has existed since the Roman use of Hypocaust heating. The heat energy is emitted from a warm element (floor, wall, overhead panel) and warms people and other objects in rooms rather than directly heating the air. The internal air temperature for radiant heated buildings may be lower than for a conventionally heated building to achieve the same level of body comfort (when adjusted so the perceived temperature is actually the same). The level of body comfort start with 19°C, since the skin receptors c(utaneous) react better of radiant heat. Rheumatic, allergic and other abnormal reactions of the body, can be eneomres reduced by the use of radiant heater.
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Convective heat transfer:
The circulation of air, as a heating method heats primary the air that rises, while the heat is on the top its cools down again. The same circulation starts again. But not only the air circulates, also different kind of bacillus, dust and pollen are circulating in the air. A temperature different up to 12°C in the same room are one reason for too dry air. Dry air is one reason for headache, coughs and sneezes and other air depending or allergic reactions. Walls and indoor environmental are keeping the moisture of structural defects of a building. A perfect place for mildews.
Convective heat transfer is a mechanism of heat transfer occurring because of bulk motion (observable movement) of fluids. This can be contrasted with conductive heat transfer, which is the transfer of energy by vibrations at a molecular level through a solid or fluid, and radiative heat transfer, the transfer of energy through electromagnetic waves. As convection is dependent on the bulk movement of a fluid it can only occur in liquids, gases and multiphase mixtures. Convective heat transfer is split into two categories: natural (or free) convection and forced (or advective) convection, also known as heat advection.
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