radiative   13

Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling | Science
New cheapish polymer coating to make a narrowband IR emitter that pumps through the LWIR atmospheric transmission window. So something can be cooled by exposing it to the sky.
passive  daytime  radiative  cooling  narrowband  emitter  IR  materials  science  research  technology  polymer  surface  coating  air  void  phase  inversion 
october 2018 by asteroza
[1802.09463] Exploring the limits of super-Planckian far-field radiative heat transfer using 2D materials
so if two surfaces are closer than the wavelength for radiative heat transfer, interesting things happen
radiative  heat  transfer  physics  materials  science  research  technology 
september 2018 by asteroza
Hundred-fold enhancement in far-field radiative heat transfer over the blackbody limit | Nature
So when the gap between surfaces is 25nm, you can get much higher radiative heat transfer. But if you are that close, why not go conductive?
radiative  heat  transfer  physics  materials  science  research  technology  nanotechnology 
september 2018 by asteroza
Radiative cooling of solar absorbers using a visibly transparent photonic crystal thermal blackbody
Uses the IR window reradiation trick to cool an object by cooling towards space, as space is a heatsink.
photonic  crystal  IR  radiative  cooling  surface  coating  materials  science  research  technology  solar  cell  Delicious 
september 2015 by asteroza
Passive radiative cooling below ambient air temperature under direct sunlight : Nature : Nature Publishing Group
Interesting mixed material which re-emits heat at atmospheric IR transparency windows, effectively becoming a passive cooler. So an external radiator on earth covered with this paint can get pretty cool.
photonic  radiative  cooling  solar  radiator  mirror  selective  thermal  emitter  materials  science  research  technology  passive  hafnium  silicon  dioxide  tuned  cooler  nanoparticle  layer  IR  infrared  transparency  window  atmospheric  green  paint  surface  treatment  Delicious 
december 2014 by asteroza
Optics InfoBase: Optica - Radiative cooling of solar cells
Etching silicon pyramids to increase surface area on a silicon PV cell improves heat rejection
solar  PV  cell  radiative  cooling  silicon  pyramid  structure  radiator  surface  treatment  Delicious 
august 2014 by asteroza
Aviation now contributes 4.9% of climate change | News & Events | Manchester Metropolitan University
A group of experts reporting to the Intergovernmental Panel on Climate Change (IPCC) has increased dramatically the figure it believes aviation contributes to climate change.

In a report published last month, the eight international scientists put aviation's total contribution -'radiative forcing' - in 2005 at 4.9%.
aviation  radiative  forcing  climate  change  ipcc  greenmonktv 
july 2009 by TomRaftery

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