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Heat Losses from a Divided-Chamber Diesel Engine

The various components of heat loss were investigated in a single-cylinder divided-chamber diesel engine. The effects of engine speed, air/fuel ratio, injection timing, intake air temperature and coolant temperature on the heat rejection to the coolant were examined. The magnitudes of heat rejections to the coolant and to the individual cooling zones (cylinder liner, intake port, exhaust port and antechamber) were found to be related primarily to the rate of fuel consumption. The contributions of piston friction and exhaust port heat transfer to heat rejection to the coolant and the magnitude of heat loss from the exterior surfaces of the engine to the surroundings were also evaluated.