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CHAPTER 5. MODELING EFFORT The previous chapter covered the data reduction techniques used to provide meaningful results from the experiments. In addition to this analysis, modeling was performed to estimate the efficiency gains of the high temperature diesel engine using WHR, as well as estimate the footprint required for each system. Both thermodynamic system level models and individual heat exchanger models were created for a selection of coolant temperatures. All models were created in Engineering Equation Solver (EES) [48], which is a simultaneous equation solver that also has a large database of thermodynamic properties for many fluids and solids. The EES property database was used for all fluid and solid material properties unless otherwise noted. The difficulty of simultaneous equation solving is that it becomes burdensome to step through and describe the calculations in a logical progression. With that in mind, this chapter will present the equations used to perform the thermodynamic analysis along with sample data needed to solve the equations. The first section of this chapter will give an overview of the WHR system design. Next, the thermodynamic models for the system will be described in detail. Finally, the last section will cover the heat exchanger models that were used to estimate the footprint of the system at varying coolant temperatures. 5.1 WHR System Design Two different WHR system configurations were modeled, one for the state-of-the-art WHR system with 90°C coolant, and one for the high-temperature coolant systems. Figure 5-1 shows the state-of-the-art system, which only recovers waste heat from the exhaust gases. The numbers shown throughout the system will be used to reference the working fluid and exhaust properties at each location. Starting in the lower left-hand corner, the pump pressurizes the working fluid, which 68PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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