Dearman Engine Company Limited

Clean Cold Power UK Limited

Peter Dearman

Henry Clarke

Michael Dearman

Michael Ayres

Don Old

Difei Zhao

Dongsheng Wen

The present invention provides a method of operating an engine () having one or more cylinders () each having a piston () within the cylinder () and each piston () having an expansion stroke and a return stroke and a top dead center (TDC) position and a bottom dead center position (BDC) and said engine () employing a working fluid (WF) and a heat exchange fluid (HEF), comprising the steps of: introducing the HEF during the return stroke of the engine; introducing the working fluid (WF) during the expansion stroke of the engine; causing the exhaust valve to be opened at or near bottom dead center of the piston BDC; delivering the HEF to the cylinder () after the exhaust valve has been opened; and closing the exhaust valve before TDC, such as to allow the working fluid to be compressed by the piston within the cylinder. The invention also provides an engine () capable of being operated in accordance with the method.

Cryogenic engine system

A cryogenic engine system and method for delivering cryogen to a cryogenic engine are provided. The cryogenic engine system comprises a tank for storing liquid cryogen, a cryogenic engine, a pump configured to pressurize cryogen from the tank, a first conduit for transporting cryogen between the pump and the cryogenic engine, a second conduit for transporting cryogen from the pump back to the tank, and a first valve disposed in the second conduit for controlling the flow of cryogen from the pump back to the tank. A pre-mixing system for a cryogenic engine and a method for mixing cryogen with a heat exchange fluid (HEF) are also provided.

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Hertfordshire, United Kingdom

Peter Dearman