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Technical information Air-Conditioning Heat Exchange

Heat transfer

Methods of heat transfer are considered in Chapter 1. However, additional information on heat exchange may be necessary in the study of air conditioning. Four types of heat exchange:
  • RadiationRadiant heat transfer means that the body radiates warmth. If the being radiated heat strikes body or substance which at lower temperatures, this heat is lost to the lower temperature of the substance. If the body is surrounded by surfaces at higher temperatures, its temperature will rise.
  • Convection-Convection is the transfer of heat from one body to another through a mediator, as a rule, air or water. Conventional ovens heat by convectionoven transfers the heat to the food through the air in the oven,
  • EvaporationEvaporation heat exchange takes place from the human body. Moisture enters the skin of the sweat glands. The evaporation of the moisture leads to a decrease in skin temperature. Evaporation is a significant heat transfer from the human body. Evaporative heat transfer can be considered a form of convection.

    (This moisture is carried away along with its heat content.)
  • ConductingConductivity of the heat exchange between the molecules or bodies in direct contact with each other. If one end of the rod steel is heated, the other end will also be warm, because the molecules in a beam of conducting heat.

principles of heat transfer are used to provide a more comfortable living conditions. Instead of small sources of heat at high temperatures, the tendency now is to supply large surfaces at moderate temperatures. The walls, floors and ceilings, heated to a moderate temperature. These large, warmed surface not absorb the warmth of the body. It gives one a feeling of comfortable temperature. This also applies to comfort cooling or air conditioning in the summer...

 
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