Sunday, September 27, 2009

Surprise Energy Alternative

updated 3:19 p.m. CT, Sun., Sept . 27, 2009

WASHINGTON - Think propane and butane are just for barbecuing? Think again: The common cooking fuels can also chill your drinks and ice cream with less energy and almost none of the global warming worries of current refrigerants.

Some of the world's largest consumer product companies are promoting freezers and refrigerators in the U.S. that use propane, butane and other coolants that don't trap heat in the atmosphere as much as Freon and other conventional refrigerants.

The new so-called hydrocarbon coolers — already popular in Europe — are being tested by Ben & Jerry's ice cream company at stores in the Washington and Boston areas. Meanwhile, General Electric is seeking approval to market a home refrigerator in the U.S. using a hydrocarbon refrigerant.

The new freezers take advantage of the way hydrocarbon gases absorb heat when they change from a liquid to a gas. It's the same process when a propane tank becomes cool to the touch when you're using it with a gas grill. The hydrocarbon refrigerant is compressed and expanded as it makes its way through the compressor and tubes surrounding the freezer.

Unlike car exhaust or power plant pollution that's spewed directly into the air, the coolants used in most U.S. refrigerators today only enter the atmosphere when their compressors leak, or when appliances are thrown out and their refrigerant eventually escapes.

If hydrocarbons are accidentally released into the atmosphere, their effect on trapping heat is about 1,400 times less than conventional refrigerants, said Pete Gosselin, director of engineering for Ben & Jerry's.

The fuels are flammable, of course, but current models only use the amount contained in two or three cigarette lighters. Electronic components are designed to prevent igniting a possible leak.

"It's extremely potent," Gosselin said. "And as the world develops, especially in developing nations, refrigeration use is one of the first technologies that comes on board."

The appliances cost about the same as similar conventional freezers and use about 10 percent less electricity.

"And that turns out to be a huge gain in terms of your carbon footprint, that 10 percent gain in efficiency," Gosselin said. "Every kilowatt hour that comes in the wall, comes in with a certain amount of CO2 footprint with it and if you can knock 10 percent off that, that's huge."

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