- #1
Carlos de Meo
- 23
- 2
Hi Guys
I was reading about selective surfaces for solar thermal conversion and, according to the literature, an ideal material for that would have high absorptance in the 0.2-2.5 μm (due to the Planck distribution for a 5000 K black body, i guess) and also low emittance to suppress the losses due to reradiation. How can that be possible?
According to Kirchoff law, emissivity=Absorption in thermal equilibrium, so, a good absorber is also a good emitter (that´s how high emissivity coatings work)
I was reading about selective surfaces for solar thermal conversion and, according to the literature, an ideal material for that would have high absorptance in the 0.2-2.5 μm (due to the Planck distribution for a 5000 K black body, i guess) and also low emittance to suppress the losses due to reradiation. How can that be possible?
According to Kirchoff law, emissivity=Absorption in thermal equilibrium, so, a good absorber is also a good emitter (that´s how high emissivity coatings work)