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to the low oil temperatures maintained on the test engine. The low oil temperatures increase heat loss to the engine oil which then must be rejected via the oil cooler. Increasing the oil temperature to 100°C would likely improve waste heat exergy for the exhaust and coolant streams, increase WHR system output and reduce oil cooler volume. The performance and condition of the engine were monitored over the course of testing. Fluctuations in engine compression were recorded during testing and metal particles in the engine oil increased as temperatures rose. Some fluctuations in apparent efficiency were also discovered. Post testing analysis revealed that HTF had leaked into the combustion chambers and that the measured leakage rates corresponded to fluctuations in the measured engine efficiency as well as other values such as exhaust temperature. The unmetered fuel entering the combustion chamber increased significantly between the 150°C coolant temperature and 175°C coolant temperature tests, making trends in engine efficiency difficult to determine at higher temperatures. Additionally, engine tear down after the experiment revealed damage to the pistons and cylinder bores from overexpansion and improper lubrication. Engine oil breakdown at the top of the piston caused the piston rings to seize in the ring grooves, possibly effecting engine compression. Scuffing and discoloration was also observed on the lifters and lifter bores. In summary, the work presented here has demonstrated that waste heat availability can be increased by as much as 40% for a diesel engine by raising the coolant temperature. Increased waste heat availability translates into better waste heat utilization in a WHR system and improvements in overall system efficiency of over 30%. However, at higher coolant temperatures increased heat exchanger footprints are required for the WHR systems. Further work is required to understand the exact effects of raised coolant temperature on combustion and engine efficiency 187PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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