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CHAPTER 6. RESULTS AND DISCUSSION The two previous chapters presented the analysis methods used for reduction of the experimental data and the heat exchanger modeling for estimating the effect of engine temperature on WHR output and system footprint. This chapter will provide the results from each analysis and discuss the implications for the viability and benefits of WHR from a high-temperature diesel engine. First, the experimental results will be covered, including the energy balance for each temperature case, engine performance, and engine emissions. Additionally, the condition of the engine during and after testing is discussed. Last, the heat exchanger model results for the high- temperature WHR systems are presented and compared with the results for the state-of-the-art WHR system that does not absorb heat from the engine. 6.1 Energy Balance One of the primary goals of the high-temperature diesel engine experiment was to determine the energy balance for the engine at varying coolant temperature. The fuel energy leaves the engine in one of the five forms: engine output, coolant heat, exhaust heat, oil heat, and other losses. The ‘other losses’ category includes all additional losses such as pumping losses, convection and radiation heat loss to the environment, and energy lost through unburned fuel in the exhaust. Friction is not specifically listed because it is assumed that energy lost to friction is converted into heat that is either transferred to one of the fluids or to the ambient air. The uncertainty methodology for the energy balance calculations is described in Appendix B. The regression analysis method was introduced in Chapter 4. This analysis was used to determine what correlations existed between the coolant temperature and the other measured and calculated values. Figure 4-1 plots the probability that each correlation is statistically significant, found by 134PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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