HOT BRAKES HELPS TO COOL REEFERS

The Witness - Wheels - - TRANSPORT -

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 buses or re­frig­er­ated food de­liv­ery trucks (reefers), as they brake to slow 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 per­cent 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.”

Kha­je­pour said the sys­tem rep­re­sented a cost-ef­fec­tive way to make cur­rent ve­hi­cles more fuel ef­fi­cient, adding the fuel sav­ings could pay for the new se­condary power sys­tem within two years.

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