Science Fiction
Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 |
Better Than Dune Chromoplastic? This Guy Might Have Done It
For those not fully in the know, the chromoplastic dew collector is one of my favorite bits of technovelgy from Frank Herbert's 1965 novel Dune:
Pretty clever idea. But a real-life (not fictional) materials scientist named Aaswath Raman at UCLA has done fiction one better with this nano photonic radiative cooler metamaterial (start around 6:50 for more background):
"how do you suppose it lives when we leave it? Each is planted most tenderly in its own little pit. The pits are filled with smooth ovals of chromoplastic. Light turns them white. You can see them glistening in the dawn if you look down from a high place. White reflects. But when Old Father Sun departs, the chromoplastic reverts to transparency in the dark. It cools with extreme rapidity. The surface condenses moisture out of the air. That moisture trickles down to keep our plants alive."
(Aaswath Raman nano photonic radiative cooler)
From fundamental thermodynamic considerations, in order to convert heat to usable work, it is important to have a heat source with a temperature that is as high as possible, and to have a heat sink with a temperature that is as low as possible. The vast majority of energy conversion processes at the moment use our ambient surroundings on Earth itself, with a temperature of approximately 300 K, as the heat sink. On the other hand, the universe, with a temperature of approximately 3 K, represents a much better heat sink. The ability to harness the coldness of the universe could therefore have broad implications for energy technologies in general, and represents an important emerging frontier in renewable energy research.The ability of photonic structures such as metamaterials to control the behavior of electromagnetic waves is essential to effectively harness the coldness of the universe. Earth's atmosphere is largely transparent to electromagnetic waves in the wavelength range of 8–13 μm. This wavelength range coincides with the spectral peak for black body radiation at 300 K. Thus, any object, when exposed to the sky, can radiate its heat out in a process known as radiative cooling (Fig. 1a) and passively reach sub-ambient temperatures.
This natural phenomenon has been implemented and studied at night for centuries. However, to improve the thermodynamic efficiency of energy technologies in general, and for cooling applications in particular, it would be far more useful to enable the same cooling effect during the day. The challenge here is that a sky-facing object faces the sun directly during daylight hours. For this purpose, then, one would need to create a structure that reflects the entire solar spectrum very well, while at the same time generating strong thermal radiation in the 8–13 μm wavelength range.
Scroll down for more stories in the same category. (Story submitted 8/9/2019)
Follow this kind of news @Technovelgy.| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |
Would
you like to contribute a story tip?
It's easy:
Get the URL of the story, and the related sf author, and add
it here.
Comment/Join discussion ( 0 )
Related News Stories - (" Engineering ")
Tornyol Microdrone Kills Mosquitoes
'The real border was defended by... a swarm of quasi-independent aerostats.'
PLATO Spacecraft, Hunter Of Habitable Planets, Now Ready
'I ... set my automatic astronomical instruments to searching for a habitable planet.' Edmond Hamilton (1936).
Did The Yautja Have These First?
What a marvel of ingenuity the little device was! - Harry Bates, 1934.
Jetson ONE Air Races Begin, Can Air Polo Be Far Behind?
'If you're one of those rarities who haven't attended a rocket-polo "carnage", let me tell you it's a colorful affair.' - John Victor Peterson, 1938.
Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.
Science Fiction
Timeline
1600-1899
1900-1939
1940's 1950's
1960's 1970's
1980's 1990's
2000's 2010's
Current News
Proof Of Robothood - Not A Person
'Who are you people? - Show 'em.'
Dancing Robots Taught Dance Moves
'A clockwork figure would be the thing for you...'
Indonesian Clans Battle
'The observation vehicle was of that peculiar variety used in conveying a large number of people across rough terrain.'
The 'Last Mile' In China Crowded With Delivery Robots
Yes, it's a delivery robot. On wheels.
Tornyol Microdrone Kills Mosquitoes
'The real border was defended by... a swarm of quasi-independent aerostats.'
PLATO Spacecraft, Hunter Of Habitable Planets, Now Ready
'I ... set my automatic astronomical instruments to searching for a habitable planet.'
Factory Humanoid Robots Built By Humanoid Robots
'...haven't you a section of the factory where only robot labor is employed?'
iPhone Air Fulfils Jobs' Promise From 2007 - A Giant Screen!
'... oblongs were all over the floor and surfaces.'
ChatGPT Now Participates in Group Chats
'...the city was their laboratory in human psychology.'
iPhone Pocket All Sold Out!
'A long, strong, slender net...'
Did The Yautja Have These First?
What a marvel of ingenuity the little device was!
Jetson ONE Air Races Begin, Can Air Polo Be Far Behind?
'If you're one of those rarities who haven't attended a rocket-polo "carnage", let me tell you it's a colorful affair.'
Will Space Stations Have Large Interior Spaces Again?
'They filed clumsily into the battleroom, like children in a swimming pool for the first time, clinging to the handholds along the side.'
Mornine Sales Robot
'Robot-salesmen were everywhere, gesturing...'
Bipedal Robot Floats Gently While Walking
'a walking balloon proceeded with long strides of its aluminum legs...'
Musk Idea Of Cars Talking To Each Other Predicted 70 Years Ago
'My cars talk to one another.'
