Tinkering away in a garage in Bishop’s Stortford, Hertfordshire, to produce a zero-emission engine, which then gets taken on by the likes of Sainsbury’s, Unilever and Marks & Spencer, is an unlikely story.

But that’s the Dearman story summed up.

Our liquid nitrogen-powered engine is a groundbreaking innovation that is emerging as a clean alternative to polluting diesel. Our technology has numerous applications- including bus air-conditioning, cooling data centres, and mobile pre-cooling for farmers. Our most advanced application is in transport refrigeration.

Consumers are understandably used to going into a shop and picking up products they need- but how many realise the long reach of the cold chain that helps so many products reach the shelves? More so, how many realise the often-polluting nature of that cold chain?

A large supermarket delivery truck bringing fresh produce to a store tends to have not one, but two diesel engines- the main engine to propel the vehicle, and a second engine to power the refrigeration.

While the main engine, regulated by the Euro emission standards, is efficient and clean, the second engine is regulated by the much weaker non-road mobile machinery regulations (NRMM). In effect, the second engine can emit six times as much nitrogen oxide and 29 times as much particulate matter as the main engine. The new NRMM regulations applying from 1st January 2019 will make little difference to this.

In contrast, the second engine powering a Dearman transport refrigeration unit (TRU) is zero emission. It emits no nitrogen oxides or particulate matter. This is a groundbreaking innovation that has arrived just as public policy awareness increases of the harms of diesel pollution.

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Dearman is pioneering the development of clean liquid air technology

Established in late 2011, Dearman is developing a suite of zero-emission technologies, powered by the expansion of liquid air or nitrogen.

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Peter Dearman inventor of the Dearman Engine