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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cover the few examples of WHR using engine coolant at temperatures over 90°C that are found in the literature. One method to increase the temperature of engine coolant for WHR is to redesign the cylinder head so that coolant flowing through the hottest area of the engine can be recovered separately from the rest of the cooling system. This strategy was employed by Endo et al [32] in addition to the work mentioned in the previous section. The authors redesigned a cylinder head and created special passages for the working fluid to flow near the exhaust valves to produce additional steam. This steam was then combined with the steam output from the exhaust powered evaporator. Heat transfer was enhanced by using many small diameter passages that encircle the exhaust ports as shown in Figure 2-4. The cylinder head was also modified to create three-layered coolant passages at the top of the combustion chamber. The 3 mm diameter passages were placed Figure 2-4. Diagram of cylinder head modified specifically for WHR with the goal of increasing working fluid temperatures [32]. Modifications include special cooling passages around exhaust valves to recover waste heat at high temperatures (~190°C). 26

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