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original model (>700°C). Consequently, the simulations using the test data showed a reduction in average power output from 6.8 kW down to roughly 3.0 kW. Graphs of the engine speed over the drive cycle indicate that the engine cycled on and off frequently throughout testing. The exhaust gas temperature is correlated with the frequency and duration of engine on time, which is low throughout much of the drive cycle. Therefore, the WHR output might have been significantly higher if coupled to a non-hybrid engine. Arias et al. established the potential for gains using high temperature coolant, but experiments to fully validate the concept appear to be non-existent in the current literature. Though experimental results for WHR using high-temperature coolant are not found, experimental research on using phase change cooling in ICEs does exist. In 2008, Katta et al. [22] tested the feasibility of phase change cooling for use with WHR in heavy duty engines. A Perkins 4.154 2.5L 4-cylinder diesel engine was instrumented and operated with a conventional single- phase cooling system as well as a two-phase cooling system. The engine was operated at speeds of 1500 and 2000 rpm and torque of 52 N-m and 110.5 N-m at each speed. At each load condition, the engine was run with single phase cooling (~70-80°C coolant temperatures), two phase cooling at atmospheric pressure (~95°C coolant temperature), and two-phase cooling at 69 kPa system pressure (~110°C coolant temperature). The cylinder head temperature was measured at four locations to determine the effect of two phase cooling on magnitude and uniformity of the engine structure temperature. The experiment showed that two phase cooling resulted in a very even temperature distribution in the engine compared to single phase cooling. For example, at 1500 rpm and 52 N-m or torque, the cylinder head temperature variation was approximately 12°C with single phase cooling. With two phase cooling, the cylinder head temperature variation was approximately 4°C at both atmospheric and 69 kPa system pressure. The authors used the results from the 29PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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