
Clean-suited technicians assemble a TE generator for a spacecraft. NASA's expertise in this technology can help cars and trucks to run more efficiently. (Credit: JPL)
By Bob Silberg
Jet Propulsion Laboratory
Next time you’re pumping gasoline into your car or truck, think about this: Three-quarters of the energy in that pricey petroleum will be wasted. Only about 25 percent of the energy in every gallon of gasoline you buy actually helps your vehicle to run. The rest is converted to heat, which is radiated uselessly off of your engine or blown out of your exhaust pipe.
What if you could recover some of that wasted energy? You’d need less gas, which would not only save money, but also reduce carbon emissions and the need for foreign sources of fuel. But is there a practical way to turn a car’s heat into useful energy?




