Scientists make thin material that acts as air conditioner

Newly engineered material can cool roofs, structures with zero energy consumption, The team with their glass-polymer hybrid Material. (University of Colorado)
Updated 10 February 2017
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Scientists make thin material that acts as air conditioner

MIAMI: Scientists have invented a new kind of thin material that can cool a surface against the heat of the sun without using energy or typical air conditioning, a study said Thursday.
The glass-polymer hybrid material measures just 50 micrometers thick — slightly more than aluminum foil — and can be manufactured cheaply, researchers said in the journal Science.
“We feel that this low-cost manufacturing process will be transformative for real-world applications of this radiative cooling technology,” said researcher Xiaobo Yin, an assistant professor at the University of Colorado, Boulder.
Uses for the product could include keeping buildings and other objects cool, as well as extending the life of solar panels.
In the case of thermoelectric power plants, which need massive amounts of water and electricity to maintain the operating temperatures of their machinery, such a film could save resources and money.
Researchers found the material could cool objects by dissipating the sun’s thermal energy in the form of infrared radiation.
In field tests, the material showed a cooling power roughly equivalent to the electricity generated using solar cells for a similar area, and could cool continuously both day and night.
“Just 10 to 20 square meters (yards) of this material on the rooftop could nicely cool down a single-family house in summer,” said co-author Gang Tan, an associate professor in the University of Wyoming’s Department of Civil and Architectural Engineering.
While not on the market yet, researchers said the material is lightweight, easy to fit to curved surfaces, and fairly simple to mass produce.


Tesla in Autopilot sped up before Utah crash

Updated 25 May 2018
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Tesla in Autopilot sped up before Utah crash

  • Heather Lommatzsch, the driver of the vehicle, told police she thought the vehicle’s automatic emergency braking system would detect traffic and stop before the car hit another vehicle.
  • Police say car data show Lommatzsch did not touch the steering wheel for 80 seconds before the crash. She told police she was looking at her phone at the time and comparing different routes to her des
SALT LAKE CITY, US: A Tesla that crashed while in Autopilot mode in Utah this month accelerated in the seconds before it smashed into a stopped firetruck, according to a police report obtained by The Associated Press Thursday. Two people were injured.
Data from the Model S electric vehicle show it picked up speed for 3.5 seconds shortly before crashing into a stopped firetruck in suburban Salt Lake City, the report said. The driver manually hit the brakes a fraction of a second before impact.
Police suggested that the car was following another vehicle and dropped its speed to 55 mph to match the leading vehicle. They say the leading vehicle then likely changed lanes and the Tesla automatically sped up to its preset of 60 mph (97 kph) without noticing the stopped cars ahead of it.
The police report, which was obtained through an open records request, provides detail about the vehicle’s actions immediately before the May 11 crash and the driver’s familiarity with its system.
The driver of the vehicle, Heather Lommatzsch, 29, told police she thought the vehicle’s automatic emergency braking system would detect traffic and stop before the car hit another vehicle.
She said she had owned the car for two years and used the semi-autonomous Autopilot feature on all sorts of roadways, including on the Utah highway where she crashed, according to the report.
Lommatzsch said the car did not provide any audio or visual warnings before the crash. A witness told police she did not see signs the car illuminate its brake lights or swerve to avoid the truck ahead of it.
Lommatzsch did not return a voicemail Thursday. A Tesla spokesperson did not respond to a request for comment.
The car company has said it repeatedly warns drivers to stay alert, keep their hands on the wheel and maintain control of their vehicle at all times while using the Autopilot system.
Police say car data show Lommatzsch did not touch the steering wheel for 80 seconds before the crash. She told police she was looking at her phone at the time and comparing different routes to her destination.
She broke her foot in the crash and this week was charged with a misdemeanor traffic citation. Online court records do not show an attorney listed for her.
The driver of the firetruck told police he had injuries consistent with whiplash but did not go to a hospital.
Tesla’s Autopilot system uses cameras, ultrasonic sensors and radar to sense the vehicle’s surrounding environment and perform basic functions automatically.
Among those functions is automatic emergency braking, which the company says on its website is designed “to detect objects that the car may impact and applies the brakes accordingly.” Tesla says the system is not designed to avoid a collision and warns drivers not to rely on it entirely.
The National Highway Traffic Safety Administration has said it is investigating the May 11 crash.
Tesla’s Autopilot has been the subject of previous scrutiny following other crashes involving the vehicles.
In March, a driver was killed when a Model X with Autopilot engaged hit a barrier while traveling at “freeway speed” in California. NHTSA and the National Transportation Safety Board are investigating that case.
This week, Tesla said Autopilot was not engaged when a Model S veered off a road and plunged into a pond outside San Francisco, killing the driver.
Earlier in May, the NTSB opened a probe into an accident in which a Model S caught fire after crashing into a wall at a high speed in Florida. Two 18-year-olds were trapped and died in the blaze. The agency has said it does not expect Autopilot to be a focus in that investigation.