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point are given in Table 5-12. The channel configuration is shown in the evaporator cross-section in Figure 5-12. The evaporator material is 316 stainless steel due to the high temperatures and pressures present. The rectangular channels were 1.45 mm wide for the exhaust rows and 2.29 mm wide for the ethanol rows, with both channels having a height of 13 mm (Figure 5-13). The overall evaporator width was set at 0.175 m, with the length varied to meet the required heat duty for each coolant temperature model. Like the condenser models, the evaporator models were split into two sections: single-phase and two-phase. In the first section of the evaporator, the ethanol is heated to the saturation temperature as a single-phase liquid. The ethanol then begins the phase change from liquid to vapor in the second section of the evaporator, exiting with a quality of exactly one. The model details and correlations used for heat transfer coefficients and friction factors will now be discussed. Like the condenser models, the NTU method was used to solve for the required evaporator length. For the single-phase section of the evaporator, the ethanol inlet temperature for the Table 5-11. Evaporator 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 height/fin length (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 - Counter-flow - 6 - 5 - Rectangular - 2.29 mm 1.45 mm 13 mm 0.254 mm 0.175 m Plain - 2.54 mm 1.7 mm 6.5 mm 15 μm 103PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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