CEMZEP - Cryogenic Engines for Mobile Zero Emission Power

A new type of engine, the Dearman Engine, uses liquid nitrogen to generate power without producing any exhaust emissions. This matters because diesel engines in heavy goods vehicles and buses are a major source of air pollution, particularly in cities. The Dearman Engine offers a low-cost, zero-emission alternative that can be deployed immediately, rather than waiting for electric or hydrogen technologies to mature. It is designed to first replace the small, lightly regulated diesel engines that power refrigeration units on delivery trucks—a source of pollution that is often overlooked. If the research succeeds, the technology could cut fuel use in buses by up to 40% by powering air conditioning and auxiliary systems. In a more efficient form, it could provide propulsion for trucks, either as a standalone engine or as part of a hybrid system with a battery or fuel cell, delivering up to 20% fuel savings. The project aims to improve the engine’s design and manufacturing through the UK supply chain, creating exports and jobs. The goal is to put the UK at the forefront of real-world emissions reduction while supporting the eventual transition to fully electric and hydrogen vehicles.