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Conservation of mass dictates that the sum of the mass flow rates in the two legs must equal the total working fluid mass flow rate for the system. From Table 5-6, the mass flow rate through the engine is 8.45 g s-1 and the mass flow rate through the evaporator is 5.89 g s-1, giving a total ethanol mass flow rate of 14.34 g s-1. Additionally, the heat transfer in the engine and exhaust evaporator were then defined in terms of these individual mass flow rates: Table 5-6. Qengine mwf,eng hwf,5 hwf,3 (5.21) Qevap mwf,evap hwf,5 hwf,3 (5.22) Thermodynamic model inputs for the representative point of 3100 rpm, 24 N-m, 150°C coolant temperature, and 90°C condenser temperature. This system utilizes both engine coolant and exhaust for WHR. Parameter Ethanol Ethanol mass flow rate through engine Ethanol mass flow rate through evaporator Isentropic ethanol enthalpy at point 2 Ethanol temperature at point 3 Ethanol enthalpy at point 3 Ethanol enthalpy at point 4 Ethanol temperature at point 5 Ethanol enthalpy at point 5 Ethanol enthalpy at point 6 Ethanol enthalpy at point 7 Isentropic ethanol enthalpy at point 7 Ethanol enthalpy at point 8 Theoretical ethanol enthalpy at T7 and P3 Theoretical ethanol enthalpy at T2 and P8 Exhaust Exhaust mass flow rate Exhaust specific heat capacity rate in single-phase evaporator Exhaust temperature at point 1 Exhaust enthalpy at point 4 Other Minimum heat capacity rate for evaporator (single-phase) Minimum heat capacity rate for superheater Value Units 8.45 g s-1 5.89 g s-1 437 kJ kg-1 135 °C 585 kJ kg-1 642 kJ kg-1 150 °C 1,331 kJ kg-1 1540 kJ kg-1 1450 kJ kg-1 1390 kJ kg-1 1303 kJ kg-1 1420 kJ kg-1 1267 kJ kg-1 15.4 kg s-1 1.07 kJ kg-1 K-1 566 °C 121 kJ kg-1 16.6 W K-1 18.0 W K-1 83PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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