Inventory of Heat Losses for a Divided–Chamber Diesel Engine

A series of experiments was performed to characterize the various components of heat losses from a single-cylinder divided-chamber diesel engine. This investigation included studies (a) to determine the contribution of piston friction to the heat rejection to the coolant, (b) to measure the amount of heat rejected through the exhaust port to the coolant and (c) to evaluate the heat losses to the surroundings. The above measurements were used to evaluate the total heat losses to the combustion chamber by the working fluid during the engine cycle. These losses were then compared to the heat losses during the closed portion of the cycle (intake valve closing to exhaust valve opening) that were computed with the aid of pressure-time data.