Rankine cycle device of internal combustion engine

Abstract

In a Rankine cycle system for an internal combustion engine, including an evaporator () for generating a vapor, an expander () for converting a heat energy of the vapor into a mechanical energy, a condenser () for cooling the vapor discharged from the expander () to restore it into water, a tank () for storage of the water from the condenser (), and supply pumps () for supplying the water in said tank () to the evaporator () in a pressurizing manner, the water in the tank () is supplied via a water jacket () of the internal combustion engine () to a dispensing valve () by the lower-pressure pump (). A portion of the water dispensed by the dispensing valve () is further pressurized and supplied to the evaporator () by the higher-pressure pump (), and another portion of the water dispensed by the dispensing valve () is discharged to the tank () after dissipating its heat in an auxiliary () such as a heater for heating a vehicle compartment and the like. Thus, it is possible to sufficiently cool heated portions of the internal combustion engine () by the water which is a liquid-phase working medium, while maintaining the performance of the Rankine cycle system, thereby aiming at the disuse of a radiator.