heat balance of a natural gas fueled spark ignition engine with a turbocharger

in this paper, the heat balance of an engine was investigated experimentally. the experimental work was conducted on the ef7 natural gas fueled and turbocharged engine. the main goal was to develop an empirical equation to be able to predict the heat balance of the engine at various loads and conditions. the data were collected at four different conditions, two different loads and two different inlet coolant temperatures, to include the effects of these parameters into the empirical equation. the exhaust energy, power, coolant energy, and the other energies were determined either directly from the collected data or indirectly calculated from the data. based on the experimental results along with the engine specifications, a mathematical equation was suggested. different types of energy can be calculated from this equation which shows a very good agreement with the experimental data.