Researchers Find Way to Reduce Environmental Impact of Idling Buses and Delivery Trucks

Researchers at the University of Waterloo have developed a system for service vehicles that could reduce emissions and save companies and governments millions of dollars per year in fuel costs.

In a study recently published in Energy, Waterloo engineers found a way to capture waste energy from service vehicles, such as buses or refrigerated food delivery trucks, as they are slowing down.

They also figured out how to use that energy to replace the fossil fuels that are currently needed to operate secondary systems, such as air conditioning or refrigeration units, when the vehicles are stopped and idling.

"An idling vehicle essentially operates at five per cent efficiency, meaning the vast majority of the fuel a bus or delivery truck uses when it is stopped is being wasted," said Amir Khajepour, a professor of mechanical and mechatronics engineering at Waterloo and the study's lead author.  "By harnessing the energy a vehicle wastes as it is slowing down and redirecting it to a secondary battery system, these vehicles can be turned off without shutting off systems such as refrigeration and air conditioning units.

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