Liquid nitrogen bus puts a freeze on emissions

A new hybrid bus running on diesel and liquid nitrogen could slash emissions and improve fuel efficiency. The CE Power bus has been built by engineers at HORIBA MIRA as part of […]

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By Jonny Bairstow

A new hybrid bus running on diesel and liquid nitrogen could slash emissions and improve fuel efficiency.

The CE Power bus has been built by engineers at HORIBA MIRA as part of an Innovate UK consortium, which included Dearman, Coventry University and the Transport Research Laboratory alongside several other groups.

Whilst driving at 20mph or below, the liquid nitrogen is warmed up to the point of boiling, creating enough pressure to drive the Dearman engine. The diesel engine takes over once the bus reaches 20mph.

This significantly reduces the emissions created during acceleration from a standstill, which usually has a heavy impact on diesel engines and produces large amounts of pollutants.

Other benefits of the engine reportedly include a longer life and easy refuelling, according to its designers.

David Sanders, Commercial Director at Dearman, said: “The Dearman engine has the potential to significantly improve the efficiency of both buses and HGVs, reducing fuel consumption and cutting pollution.

“Crucially it can provide a cost effective alternative to other emerging zero emission technologies, whose environmental performance is often offset by complexity and cost.”

The Scottish Government has announced £3 million in funding for green buses in the country.