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Table 5-10. Condenser model inputs for the representative point of 3100 rpm, 24 N-m, 150°C coolant temperature, and 90°C condenser temperature. All Phases: Value Units Air inlet temperature (Tin,cold) 25 °C Air dynamic viscosity (μair) 0.019 mPa-s Air density (ρair) 0.994 kg m-3 Air heat capacity (cp,air) 1.01 kJ kg-1 K-1 Ethanol mass flux (Geth) 30.9 kg m-2 s-1 Single-phase: Minimum heat capacity rate (Cmin=Ceth) 26.0 W K-1 Maximum heat capacity rate (Cmax=Cair) 29.6 W K-1 Ethanol inlet temperature (Tin,hot) 110.8 °C Actual heat transfer rate (Q̇ ) 0.54 kW Tube wall thermal conductivity (kw) 240 W m-1 K-1 Ethanol thermal conductivity (keth) 0.023 W m-1 K-1 Ethanol dynamic viscosity (μeth) 0.011 mPa-s Ethanol density (ρeth) 2.43 kg m-3 Two-phase: Average ethanol quality (xavg) 0.975 - Minimum heat capacity rate (Cmin=Cair) 10.4 W K-1 Ethanol inlet temperature (Tin,hot) 90 °C Actual heat transfer rate (Q̇ ) 0.60 kW Liquid ethanol heat capacity (cp,eth,l) 3.06 kJ kg-1 K-1 Liquid ethanol dynamic viscosity (μeth,l) 0.381 mPa-s Liquid ethanol thermal conductivity (keth,l) 0.150 W m-1 K-1 Liquid ethanol density (ρeth,l) 724.7 kg m-3 Vapor ethanol density (ρeth,g) 2.50 kg m-3 Ethanol inlet pressure (Peth,in) 157.3 kPa Ethanol critical pressure (Pcrit) 6,268 kPa Ethanol surface tension (σ) 0.017 N m-1 The term Cmin is the minimum heat capacity rate of the two fluids. Note that the total mass flow rate of the air flowing across the condenser is found iteratively due to the cross-flow design. The actual heat transfer is some fraction of the maximum, and this fraction is known as the effectiveness ε: Q εQmax (5.24) 89PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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