Game-changing engine technology

Utilising the power of waste heat to improve air quality and cut CO2 emissions, while boosting fuel efficiency

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We are Dolphin N2

We are:

A new Ricardo spin-out company formed to deliver game-changing engine technology to market. The CryoPower engine is deally suited for application in heavy-duty trucks and in stationary distributed power generation systems.

Our aim:

To get the first ultra-efficient trucks harnessing our waste heat technology on the road early in the next decade.

Our technology:

Is proven & patented – paving the way for a full system demonstration, subsequent pilot applications and industrialization.


The big breakthrough for diesel emissions and efficiency

We estimate that in a heavy duty truck application CryoPower would provide potential operator savings of approximately £9000 ($12,500) per year for each vehicle

CryoPower and ThermoPower are recuperated split cycle engines. The revolutionary step is to separate the “cold” and “hot” parts of the traditional internal combustion engine so that each can be separately insulated.

The cold compression cylinder delivers air to the hot combustion cylinder via a heat exchanger or ” recuperator ” that transfers energy from the hot cylinder exhaust, considered waste in a conventional engine, to the intake air.

Further efficiency improvement can be achieved  with the CryoPower version by injecting a small amount of liquid nitrogen in the cold cylinder which means that compression is done isothermally.
The split cycle technologies developed by Dolphin N2 redefine the process of fuel combustion to the extent that it has been described by leading academics as a lower temperature oxidation process akin to that in a fuel cell rather than a combustion process that occurs at higher temperatures.

The result is that the negative by products of combustion: – NOx and particulates are avoided at source meaning that this system can achieve at least  the California Air Resources Board SULEV  level using known “SCR” (Urea-based) after-treatment.

The combustion process  is compatible with current liquid fuels meaning it can use the current fuel infrastructure but is also compatible for future synthetic  fuels, liquid or gaseous derived from carbon capture and ‘wrong time’ renewable energy


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