Infrared (IR)
Heat transfer modes.
There are three modes of heat transfer:
01.
Conduction.
The transfer of energy from hot to a cold area of the same object.
02.
Convection.
Transfer of energy by contact between a moving gas and a gas, liquid or solid.
03.
Radiation.
Contactless energy transfer from an emitter to an object.
Infrared belongs to the family of thermal radiation.
IR wavelengths.
The wavelength is determined by Wien’s law: λMax = 2.8978. 10-3 / T (°K)
The choice of wavelength affects yield, and must be adapted to the chosen process.
Convection / radiation comparison.
Convection.
Low power density.
E = β(Tair – Tproduct)
Radiation.
High power density.
E = a(T4transmitter – T4product)
The wavelength is determined by Wien’s law: λMax = 2.8978. 10-3 / T (°K)
The choice of wavelength affects yield, and must be adapted to the chosen process.
