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pressure (point 7 to point 1) is found using the saturation temperature and quality at the condenser outlet. The pressures for each system configuration are listed in Table 5-4. The WHR systems modeled here require four primary heat exchangers (condenser, evaporator, superheater, and recuperator) and an oil cooler for the engine to ensure the increased engine temperature does not have a negative impact on oil temperature. The condenser is modeled as an aluminum compact heat exchanger with a cross-flow design, much like an automotive radiator. The evaporator is modeled as a counter-flow heat exchanger with rectangular tubes and the cooler fluid (ethanol) flowing in the outer tubes to reduce heat loss. The superheater also uses rectangular tubes, but is a cross-flow design. The recuperator is of similar construction as the evaporator, with a counter-flow design and the cooler fluid running in the outside tubes. Finally, the oil cooler is another compact heat exchanger with cross-flow design much like the condenser. More detail on the construction of the individual heat exchangers is provided in section 5.3, Detailed System Modeling. Table 5-4. System pressure values for each of the modeled system configurations. Condenser Temperature [°C] Coolant Temperature [°C] High Side Pressure [kPa] Low Side Pressure [kPa] 60 90 2,959.30 46.77 150 981.61 46.77 175 1,767.04 46.77 200 2,959.30 46.77 90 90 2,959.30 157.59 150 981.61 157.59 175 1,767.04 157.59 200 2,959.30 157.59 A thermodynamic model description and sample calculation are provided for each of the two basic WHR system designs. The state-of-the-art 90°C coolant temperature system shown in Figure 5-1 does not utilize engine coolant waste heat and will be presented first. The high- 76PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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