Techniques for engine cooling using supercritical fluids and a combustion engine system implementing the same

A method for cooling a cylinder head in an internal combustion engine comprising:

• providing a cylinder head comprising a combustion chamber and an exhaust outlet fluidly coupled to the combustion chamber to output combustion gases which exhaust outlet outputs exhaust gases in first direction, including a supercritical fluid passageway extending at least partially through the cylinder head to communicate a volume of a supercritical fluid into the cylinder head and draw heat from the combustion gases;
• providing a cylinder block, the cylinder head mounted to the cylinder block, and wherein the cylinder block defines a portion of the combustion chamber wherein the cylinder block includes a lubricant passageway extending at least partially therethrough to communicate oil through the cylinder block and a supercritical heat exchanger to draw heat from the oil from an oil output by the lubricant passageway;
• and
• providing a supercritical fluid and flowing said supercritical fluid in said supercritical passageway in a second direction counter to said first direction.

A combustion engine system comprising:

• a cylinder head comprising:
• a combustion chamber and an exhaust outlet fluidly coupled to the combustion chamber to output combustion gases;
• a supercritical fluid passageway extending at least partially through the cylinder head to communicate a volume of a supercritical fluid into the cylinder head and draw heat from the combustion gases wherein said fluid passageway vents to an outlet;
• and
• wherein the volume of supercritical fluid is supercritical carbon dioxide (sCO2) and wherein the supercritical fluid passageway is configured to withstand pressures of at least 200 bar.