General Motors, BMW Looking to Convert Vehicle Exhaust into Energy

The Department of Energy laid down a challenge to motor companies to improve fuel efficiency by 10 percent by converting wasted heat and exhaust. General Motors, BMW and other motor companies are using their own resources as well as DOE funding to meet this goal. The Associated Press reported recently on advancements in thermoelectric devices that are capable of converting lost heat into electrical currents.



General Motors has already developed an attachment for exhaust pipes that will be tested on a Suburban SUV throughout 2009. GM’s researchers state that the device prototype may increase fuel efficiency by one mile per gallon in the Suburban with greater results in smaller models. BMW has collaborated with scientists at Ohio State University to create exhaust systems within the next three years that meet DOE goals. Both companies are using prototypes throughout the 2009 calendar year in hopes of getting thermoelectric devices on streets in the next five years.

The main reason for optimism about thermoelectrics is the applicability of these devices in other industries. NASA and international space agencies have used thermoelectric devices to power probes for years. Promethean Power Systems has coupled thermoelectric devices with solar panels to refrigerators for improved cooling.

Another reason why automotive companies are excited about exhaust recovery is the potential fuel savings for drivers. The Department of Energy tested out a diesel truck with a thermoelectric exhaust attachment more than a decade ago that ran well for 500,000 miles. The agency’s researchers note that 60 to 70 percent of heat produced within the average engine is wasted during operation.

The commitment of automotive companies to thermoelectrics is a major step forward toward improved fuel efficiency and lowered emissions. There are millions of cars, trucks and SUVs on the road today that could be improved with thermoelectric exhaust kits purchased through licensed dealers. Manufacturers like BMW, GM and Ford could ease gradually into the next generation of vehicles while meeting emissions and fuel efficiency standards.

The two barriers to market entry for automotive thermoelectric devices are price and driving habits. Automotive companies need to test, produce and market exhaust recovery systems that won’t force consumer to balk at fuel efficient driving. Drivers need to refrain from adding every electric device possible to their vehicles and operate their vehicles responsibly to derive the greatest benefits from thermoelectric products.

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