Boiling liquid cooling system for internal combustion engines
AssigneeEvans Cooling Associates
InventorJohn W. Evans
Life of this patent
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Abstract
A reduction of hot spots in the combustion chambers and the simultaneous elevation of bore temperature in an internal combustion engine are achieved by a boiling liquid cooling process in which a high molecular weight, high saturation temperature organic coolant is supplied to the coolant jacket of the engine head entirely in the liquid state, thereby greatly reducing the ratio of vapor to liquid in the head jacket for more effective heat transfer from the head to the coolant.
Claims14
A cooling system for an internal combustion engine, the engine including a coolant jacket, and having a condenser and conduit means for conducting coolant vapor from substantially the highest zone in the coolant jacket to the condenser and for returning coolant condensate to the coolant jacket characterized in that the coolant is a high molecular weight organic liquid having a saturation temperature at atmospheric pressure of not less than about 132.degree. C. (270.degree. F.), a molar heat of vaporization at atmospheric pressure of greater than about 9,800 cal/mole and a surface tension at 15.degree. C. (59.degree. F.) of less than about 70 dynes/cm.
A boiling liquid cooling process for internal combustion engines in which coolant vapor is conducted from substantially the highest zone in the engine coolant jacket to a condenser, is condensed and the condensate is returned from the condenser to the engine, characterized by the step of under all operating conditions of the engine supplying coolant exclusively in a liqud state substantially free of vapor to the coolant jacket of the engine head such that the major part of the head coolant jacket is kept filled with coolant in the liquid phase at all times, the coolant being a boilable organic liquid having a saturation temperature at atmospheric pressure of not less than about 132.degree. C. (270.degree. F.), a molar heat of vaporization at atmospheric pressure of greater than about 9,800 cal/mole and a surface tension at 15.degree. C. (59.degree. F.) of less than 70 dynes/cm.
Dependencies are inferred from the claim text.