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WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE

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WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE ( waste-heat-recovery-from-high-temperature-diesel-engine )

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Table 3-1. Test engine specifications [37]. Engine Specifications Model DM 700D Number of Cylinders 3 Bore x Stroke [mm] 68 x 64 Displacement [cc] 697 Compression Ratio 25:1 Net Power [kW] @ 3600 rpm 10.44 Torque [N-m] @ 2400 rpm 35.25 Fuel System Injector Pump Bosch VE (distributor type) Injector Nozzle Type Throttle Injector Pressure [bar] 140 3.1.1 Cylinder Head Sealing One of the primary concerns when increasing the coolant temperature of the engine was maintaining the cylinder head to engine block seal. As engine temperature increases, the cylinder head expands against the cylinder head bolts, and, at high enough temperatures, it will crush a traditional composite cylinder head gasket. The result would be a loss of seal between the cylinders and the coolant passages or between the cylinders themselves. Either failure would result in a loss of compression in one or more cylinders or leakage of oil or coolant into the combustion chambers. The following three modifications were made to prevent the failure of the cylinder head to block seal. First, the traditional composite cylinder head gasket was replaced with a solid copper gasket made from dead soft 99.9% pure copper (Figure 3-1). It was essential that the copper be sufficiently soft to properly conform to the engine block and cylinder head surfaces. The copper gasket was designed in SolidWorks® and cut out on the waterjet at the CSU EECL. The original gasket was scanned in and the image, along with measurements of the original gasket, was used to create an accurate sketch. The sketch was then converted to the necessary files for the waterjet. 33

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