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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 :
Forget smartwatches, now you can wear an 'AIR CONDITIONER' on your wrist: Smart bracelet provides cool or warm air on demand - evoke.ie
What Would We Do Without It? A Look at Our Love Affair With Air-Conditioning - nytimes.com
Will the Air Conditioner Fall out of the Window? - ehow.com
Why Does Your Air Conditioner Freeze Up? - Blog.mysanantonio.com
Schools Strive for Efficiency, Comfort - Achrnews.com
Ambi Climate seeks to bring 'smart air conditioning' to Hong Kong - Scmp.com
Pandas are benefits cheats who fake pregnancy for better lifestyle, says expert - Metro.co.uk
How Air Conditioning Struggled to Make Its Way Into Your Home - Gizmodo.com
Do-it-this-weekend ways to improve your home's indoor air quality and energy efficiency - Scoopsandiego.com
Why your air conditioner isn’t cooling you off. What to do if your air conditioner is wimping out - Consumerreports.org
Cool Ways to Hide the Air Conditioner in Your Yard - Realestate.aol.com
Control Your Air Conditioning From Your Phone With This Nifty Plug-In - Wired.com
Using solar energy to power MTN’s air conditioning - Htxt.co.za
Tech Review: A Smart Home Knows When to Blast the AC - online.wsj.com
Fair Lawn company uses ice to cut air conditioning bills - nj.com
LG AC Systems Meet Energy Efficiency Demands Of Architects And Design Professionals - nassaunewslive.com
Tips to help lower air-conditioning bills - greenvilleonline.com
Americas spend billions for air conditioning. How to spend less while keeping cool. - csmonitor.com
Air Conditioner Maintenance - kspr.com
Tado Cooling can make any air conditioner smart and save you some money - Techtimes.com
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