Navigation Links
Let the sun shine in: Redirecting sunlight to urban alleyways
Date:4/14/2014

WASHINGTON, April 14In dense, urban centers around the world, many people live and work in dim and narrow streets surrounded by tall buildings that block sunlight. And as the global population continues to rise and buildings are jammed closer together, the darkness will only spread.

To alleviate the problem, Egyptian researchers have developed a corrugated, translucent panel that redirects sunlight onto narrow streets and alleyways. The panel is mounted on rooftops and hung over the edge at an angle, where it spreads sunlight onto the street below. The researchers describe their design in a paper published today in Energy Express, a supplement of The Optical Society's (OSA) open-access journal Optics Express.

"We expect the device to provide illumination to perform everyday tasks, and improve the quality of light and health conditions in dark areas," said Amr Safwat, a professor of electronics and communications engineering at Ain Shams University in Cairo, Egypt. These dimly lit areas specifically include narrow streets in developing countries, but Safwat said the new panel could be used in any country as a greener, cheaper, and more pleasant alternative to fluorescent and other artificial light.

While other commercially available window-like devices can redirect light, they are designed for shade and redirecting glare or for brightening a roomnot a narrow street. So the researchers decided to create their own design. They wanted a simple way to redistribute natural light without the need for a tracking device that follows the rising and setting sun.

What they came up with is a panel made of polymethyl methacrylate (PMMA), the same acrylic plastic of which Plexiglas is made. The bottom of the panel is smooth while the top is covered in ridges that are based on a sine wave, the mathematical function that describes everything from light to pendulums. The researchers used computer simulations to find the size and shape of the grooves that distribute the most amount of sunlight in a wide range of sun positions all year round, whether it's high or low in the sky. A sine-wave pattern is also easy to manufacture.

Using simulations of sunlight shining on an alleyway, the researchers found that their panels increased illumination by 200 percent and 400 percent in autumn and winter, respectively, when sunlight is most limited. They also tested a small prototype over a 0.4-meter-by-0.4-meter shaft that is 1.2-meters deep and found that it lit up the area as designed.

The next step, Safwat said, will be to build a full-scale model 10 times bigger to validate their calculations and to test it in a real alleyway. The team then plans to market and commercialize the panel. He estimates that a one-square-meter panel and a frame will cost between $70 and $100.

And that may be a small price to pay for the benefits of sunlight. The lack of sun in urban areas doesn't just make life gloomy; it can be harmful to your health, Safwat said.

"Research has shown that lack of natural lighting can cause severe physiological problems," such as serious mood changes, excessive sleeping, loss of energy and depression, Safwat said.

He also noted that using sunlight to illuminate historical placessuch as ancient alleyways in Egyptalso helps preserve the authenticity of the site, maintaining its cultural value and historical significance.


'/>"/>

Contact: Angela Stark
astark@osa.org
202-416-1443
The Optical Society
Source:Eurekalert  

Related medicine news :

1. Brilliant blue G may shine in treating traumatic brain injuries
2. R- Squared Implements SpendTracker® for French Sunshine Act
3. Tulikivi Fireplace Shines at Wood Stove Decathlon
4. End Hunger Connecticut!’s Rich State, Empty Plates Symposium Shines Spotlight on Growing Food Insecurity Amidst Great Affluence
5. Baron & Budd Recognizes the Fifth Annual Shine a Light on Lung Cancer Vigil
6. Christmas Cheer Shines Bright with LED Christmas Lights Online Illuminating Neighborhoods Nationwide
7. Dwell Vision Award Winners Shine Spotlight on Sustainability
8. A New Imaging Efficiency Dashboard from Health Data Intelligence Shines the Spotlight on the Quality and Efficient Use of Outpatient Medical Imaging Tests at US Hospitals
9. Actors, Models and Talent for Christ (AMTC) Will Hold Auditions on Saturday, April 13th for the Last Time Before The Next SHINE Convention in Orlando
10. Rain or Shine, Summer or Winter, Use a Daily Suncreen to Prevent Wrinkles and Skin Cancer, Says Sublime Beauty®
11. Sunshine Advisor Urged Readers to Take Advantage of the Growth of the Life Insurance Industry
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Let the sun shine in: Redirecting sunlight to urban alleyways
(Date:3/23/2017)... ... March 23, 2017 , ... ... businesses of the greater Fort Collins area, has unveiled a collaboration with nonprofit ... involvement program. Donations to this worthy cause may now be made at ...
(Date:3/23/2017)... , ... March 23, 2017 , ... After raising more ... FaceCradle , the most-funded travel pillow in crowdfunding history, has established a ... its wildly popular travel innovation to Americans. , “We’re excited to be operating on ...
(Date:3/23/2017)... ... March 23, 2017 , ... ?This conference will prominently feature 150+ Hospital and Health System ... AMN Healthcare: Susan Salka , 43rd President of the United States of America: ... My Life In and Out of the Ring: Sugar Ray Leonard , JD, ...
(Date:3/23/2017)... ... March 23, 2017 , ... Sharon Kleyne, host of the nationally syndicated ... Health on VoiceAmerica, recently talked on her program about how she is looking forward ... remind listeners of an important distinction. World Water Day, Kleyne pointed out, is an ...
(Date:3/23/2017)... Raton, FL (PRWEB) , ... March 23, 2017 ... ... of dietary supplements that help improve all aspects of people’s health and nutrition, ... website for nutritional products. , Natural Subsistence develops nutritional supplements that help ...
Breaking Medicine News(10 mins):
(Date:3/23/2017)... 23, 2017  Additive Orthopaedics, LLC., an early ... has kicked off a multi-centered clinical study to ... segments. According to Brian McLaughlin ... lattice structures have already shown tremendous post-operative success ... allograft wedges from which we have seen evidence ...
(Date:3/23/2017)... 23, 2017 Newborns are highly vulnerable ... vaccines because their young immune systems typically mount ... Hospital report achieving strong vaccine responses in newborn ... before human trials — by adding compounds known ... two simultaneous papers, they also describe improved adjuvant ...
(Date:3/23/2017)...  A new genetic test has been discovered ... who carry HLA-B*15:02 and who are ... deadly side effect of certain medications used to ... HLA-B*15:02 is strongly associated with life-threatening severe ... toxic epidermal necrolysis in patients treated with carbamazepine ...
Breaking Medicine Technology: