COGENERATION IN INTERNAL COMBUSTION ENGINES (ICE) USING DIRECT BOILING IN THE COOLING JACKETS

Cooling of combustion chamber in an ICE is fulfilled by changing the phase of the cooling medium instead of increasing its temperature. This have been applied considering the thermodynamic properties of the coolant and hew much heat can be transferred from engine walls to a second user. The study emphasizes on the concept of cogeneration rather than cooling, waste heat recovery, or enhancing engine performance separately. Based on cogeneration concepts, design and selection of the cooling system led to generation of additional mechanical power from an organic Rankine cycle (ORC) using R113 as the working medium. At the same time R113 works as the coolant of cylinder walls. Walls, here, represent the furnace in the boiler of the ORC. However, implementing this method proves the added value of selecting a cooling system that produces a useful output. Results show that the most significant factors affecting the system performance are good match between cooling requirement for the engine and enthalpy addition to the working medium for the ORC, and the influence of heat transfer mechanism from cylinder wall to coolant. Comparison with typical energy and exergy analyses for other power plants showed that merits are anticipated from applying evaporative cooling with ICE's.