Heat transfer device
A technology of heat transfer and equipment, applied in the field of heat transfer equipment, can solve the problems of environmentally harmful compounds and limited operating life
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[0114] Heat is transferred by one of four mechanisms: conduction, convection, advection, and radiation. Only heat transfer is considered between stationary objects placed in a vacuum, thereby excluding advection, thereby excluding convection, and good thermal insulation, thereby having negligible conduction, leaving radiation as the only important heat transfer mechanism. Here we will consider this case.
[0115] All objects emit black body thermal radiation. The emitted power (in watts) is related to temperature and surface area by the Stefan-Boltzmann law:
[0116] P=∈σAT 4
[0117] where ∈ is the surface emissivity and σ is the Stefan-Boltzmann constant (5.670373×10 -8 w -2 K -4 ), A is the surface area of the object, and T is the surface temperature of the object in Kelvin.
[0118]When an object emits thermal radiation, it loses internal energy and its temperature decreases. All objects that emit thermal radiation are also capable of absorbing thermal radiation....
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