In this paper, the air cooling method of
TEC is mainly introduced.
1.Air national convection cooling
In many small TECs, heat exchange system with air national convection cooling is usually used, which needs a certain
heat sink as the heat exchanger. The heat moved by cooling medium is absorbed by heat exchange of the cold end heat absorber and air around. Then based on the heat conduction of connection pieces and insulation layers, the heat is taken away by thermopile cold end and after that the heat is transferred to the hot end
heat sinks by the thermal conductivity of each layer. Based on air convention,
heat sinks dissipate the heat into the environment, to achieve the cooling purpose. There are many kinds of heat sinks for air cooling, such as heat sink with ribs, acicular heat sink and so on. It is noteworthy that in the process of heat dissipation, except for heat convection, there is also radiation heat transfer. Studies show that under different surface temperature of heat sinks, the radiation heat transfer of the heat sink surface also plays a very important role.
2.Forced-convection heat transfer
When comparing with natural ventilation, the forced-convection heat transfer has improved the heat transfer coefficient a lot, and in the same power dissipation, its radiating area is reduced by many times. However, when using the forced ventilation heat sink, the calculations of additional conditions must be considered, such as the structure size of heat sinks, surface roughness, air velocity, and so on.
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