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temperature (Tc,in) is 150°C, and the minimum heat capacity rate is 18.0 J s-1 K-1 (Cexh), yielding a maximum heat transfer rate of 7.48 kW. The actual heat transfer rate for the evaporator is 3.00 kW, giving a heat exchanger effectiveness of 40.2%. The cross-flow design of the superheater required the use of equation (5.25) for the NTU. The effectiveness of 40.2% yields an NTU value Table 5-13. Superheater model design and dimensions. Parameter Value Units Material HX design Ethanol rows (Nrow,eth) Exhaust rows (Nrow,exh) Channel shape Ethanol channel width (wch,eth) Exhaust channel width (wch,exh) Channel (fin) height (hch, Lf) Channel wall/fin thickness (tw) HX width (whx) Fin style Ethanol fin pitch (pf,eth) Exhaust fin pitch (pf,exh) Corrected fin length (Lc) Absolute roughness (e) 316 Stainless Steel - Cross-flow - 3 - 2 - Rectangular - 1.45 mm 1.45 mm 13 mm 0.254 mm 0.1 m Plain - 1.7 mm 1.7 mm 6.5 mm 15 μm Table 5-14. Superheater model inputs for the representative point of 3100 rpm, 24 N-m, 150°C coolant temperature, and 90°C condenser temperature. Parameter Value Units Minimum heat capacity rate (Cmin=Cexh) 18.0 W K-1 Maximum heat capacity rate (Cmax=Ceth) 33.0 W K-1 Exhaust inlet temperature (Tin,hot) 566.0 °C Ethanol inlet temperature (Tin,cold) 150.0 °C Actual heat transfer rate (Q̇ ) 3.00 kW Exhaust thermal conductivity (kexh) 0.054 W m-1 K-1 Channel wall thermal conductivity (kw) 18.8 W m-1 K-1 Exhaust viscosity (μexh) 0.034 mPa-s Exhaust mass flux (Gexh) 12.2 kg m-2 s-1 Exhaust density (ρexh) 0.482 kg m-3 Ethanol thermal conductivity (keth) 0.035 W m-1 K-1 Ethanol viscosity (μeth) 0.014 mPa-s Ethanol mass flux (Geth) 4.32 kg m-2 s-1 Ethanol density (ρeth) 12.6 kg m-3 114PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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