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Abstract
Improper rejection of heat from exhaust can result in poor thermal efficiency of an engine. Therefore, it is necessary to evaluate the heat losses through heat balance sheet to optimize the efficiency of an engine. This is an experimental approach made to develop a heat balance sheets at varying engine hardware parameters to evaluate the heat transfer characteristics from the exhaust gas. The tests were conducted on a BSII commercial, four cylinders, four strokes, in-line overhead valve,water-cooled direct injection diesel engine.The test conditions were set at OEM setting and the heat balance sheet was prepared. Thereafter the test severity was made to match the real-timesituationsituations by varying hardware parameters like injection pressure (OEM: 240bar) to 220 & 200bar, auxiliary air pressure (0.50-0.55bar), injection timing (29°CA BTDC to 24°CA BTDC) and air throttling (0-50%). The analysis was done at varying hardware parameters individually, and in combinations.