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performance and packaging. The four heat exchangers shown in the WHR system diagrams from the previous section were modeled and will be described in detail in this section. First, the condenser model will be covered, followed by the evaporator, superheater, and recuperator models. Next, the oil cooler models for each system are described since higher engine temperature leads to increased heat rejection to the engine oil, which may require a larger oil cooler. Finally, the radiator models for the 90°C systems are covered. The 90°C WHR systems do not utilize the waste heat from the engine coolant and therefore a radiator is needed to reject this heat to the environment. The assumptions and inputs for the models are listed in Table 5-7 and Table 5-8, respectively. The models neglect contact resistances as well as fouling resistances for simplicity. Table 5-7. Detailed heat exchanger model assumptions. Assumption Value Units Ambient air temperature 25 °C Ambient air pressure 85 kPa Air speed over condenser 3 m s-1 Air speed over oil cooler/radiator 2.2 m s-1 Exhaust inlet pressure (superheater) 101 kPa Contact resistance None - Table 5-8. Heat exchanger model inputs. Input 90°C 150°C 175°C 200°C Exhaust inlet temperature (superheater) [°C] 500.6 566.0 539.1 597.3 Exhaust inlet temperature (evaporator, 60°C condenser) [°C] 379.2 319.7 290.1 314.2 Exhaust inlet temperature (evaporator, 90°C condenser) [°C] 374.7 398.1 334.7 293.3 Exhaust mass flow rate [g s-1] 16.27 15.43 15.35 15.87 Coolant mass flow rate (60°C condenser, total) [g s-1] 5.28 12.64 9.75 10.48 Coolant mass flow rate (90°C condenser, total) [g s-1] 5.47 14.34 11.17 11.23 Fuel flow rate [g s-1] 0.626 0.667 0.613 0.649 85PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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