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additional waste heat from high-temperature coolant can significantly increase the WHR system size and cost. One way to minimize this effect is to use the engine block as an evaporator and utilize the WHR working fluid as the engine coolant. This design eliminates the need for a second evaporator and thereby reduces the size and cost impact of the WHR system. In addition, the thermal resistance between the engine and the working fluid is decreased, which further improves the utilization of the waste heat from the engine. Using the engine cooling passages as an evaporator means that heat is removed from the engine via phase change rather than temperature change of the coolant. Phase change cooling has a number of advantages over traditional cooling systems in automotive applications. First, since boiling occurs at a constant temperature, the temperature of the engine structure tends to be more uniform which increases engine longevity [22]. Additionally, the high heat transfer coefficients during boiling allow for a reduction in coolant mass flow rate, thus lowering the coolant pump power requirements. Finally, phase change cooling allows for faster warm-up times which can lower fuel consumption and emissions [23]. 1.2 Research Objectives The main objective of the current research is to investigate the benefits and feasibility of WHR from a high-temperature diesel engine as a means to dramatically increase overall system efficiency. The state-of-the-art WHR systems offer relative efficiency gains of approximately 5 to 8%. Though no specific efficiency goal was set for this work, initial calculations suggested efficiency gains of 3X the state of the art are possible. The target of the current research is to understand how operation at elevated temperatures effects engine performance and longevity. An energy balance was performed on a modified 3-cylinder diesel engine at coolant temperatures of 90°C, 100°C, 125°C, 150°C, 175°C, and 200°C. The condition of the engine was monitored throughout testing and the engine was disassembled after the experiment was complete to inspect 5PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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