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Cooling From the Sun?
This story is part of a special series that explores energy issues. For more, visit The Great Energy Challenge.

For years, the energy world has puzzled over how to harness the sun to make rooms cool.


That may sound counterintuitive to those who think primarily of the uncomfortable heat beating down on roofs and windows as the summer sun reaches its apex. But to those who ponder the sun's tremendous energy, there's a perfect symmetry in the idea of solar cooling. The power of the sun could be used just when it's needed most.

Solar cooling is one of an array of ideas for greener air-conditioning by making better use of the forces of nature. Air-conditioning has transformed summertime living in the developed world, but at a tremendous energy cost. Invented in 1902 by Willis Haviland Carrier, early air-conditioning cooled air by causing it to pass through refrigerant-cooled coils. Conventional air-conditioning is much the same today, guzzling juice from the electric grid to compress gaseous refrigerant back to liquid state in each cooling cycle.


Strain on electricity systems reaches critical mass due to summer AC demand. Heating homes in winter also requires a lot of energy, but there are many warming options—natural gas, oil, wood. Conventional cooling relies on electricity; as a result, peak summer power demand in the United States, where more than 80 percent of households have air-conditioning, is more than 20 percent higher than at the winter high point. (Cooling accounts for 8 percent of U.S. household energy use.) Power companies must have "peaker" plants on hand for the hottest summer afternoons: typically old, inefficient fossil fuel facilities. The hotter it gets, the hotter they run. Talk about counterintuitive.

Although AC traditionally has not been as pervasive in Europe, demand for cooling in the EU is growing, especially in the wake of the devastating 2003 heat wave blamed for 35,000 to 52,000 deaths. So Europe has done some of the most detailed research on the the potential of solar cooling.

(Related: "Heat Wave Due to ‘Exceptionally Strong' Air Mass")

Several companies have recently introduced air conditioners packaged with solar photovoltaic panels, like those being installed on a Sydney, Australia rooftop above.

LG Electronics' solar-hybrid cooling system and Lennox SunSource solar-assisted heating and cooling are two examples. But PV linked to a traditional air conditioner isn't a complete solution. Typical residential central air conditioners draw 2,000 to 5,000 watts of power. The LG system's solar panel can produce only 70 watts of that power, meaning it cuts power demand only slightly.

Lennox says that its system, which includes a 190-watt panel, can slash heating and cooling bills by half. It makes use of its highest efficiency models, the fact that a number of solar panels can be added to the system, and that customers get real-time data on their energy use as part of the package.

But researchers think there are greater advances ahead for cooling with less energy.


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รายการข่าวอื่นๆ มีดังต่อไปนี้ :
Air conditioners and noise - Boston.com
Carrier's Invention of Modern Air Conditioning Celebrates 110 Years of Making the World a Cool Place to Live, Work and Play - Marketwatch.com
Is your air conditioner not running cold enough? The fix will cost you more these days - Wxyz.com
Staying cool: Tips for air conditioner use - Kare11.com
Is Air Conditioning a Human Right? The New York Times Debates the Question - Care2.com
Huntsville fire responds to 'moderate-size' fire at business on Pulaski Pike - al.com
Arizona Air Conditioning Service Shares Tips on How to Protect Your Air Conditioner through the Summer Months. - Sfgate.com
Man rescued from Mashpee building: Extreme heat prompts safety warnings - Wicked Local.com
Top 4 things that interfere with central AC - Mnn.com
Can aircon make you sick? - Health24.com
Green Roofs in Big Cities Bring Relief From Above - Nytimes.com
Green Becomes Developers' Color of Choice - Online.wsj.com
Toyota Leads the Way in Green Buildings - Marketwatch.com
Cogenra tests solar cogeneration tech for cooling things off - Zdnet.com
Toshiba building new air-conditioner plant at Bangkadi - Bangkokpost.com
LG Electronics Brings New, Innovative Energy-Efficient Commercial HVAC Solutions To LEED-Focused Architects - Marketwatch.com
Energy performance standards for air conditioners comprehensively upgraded in India - Business-standard.com
Healthier buildings for healthier occupants - Mercurynews.com
Green schools to be ready only next year - thenational.ae
Doctors say turn on air conditioner to get allergy relief - Clickondetroit.com
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