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Figure 5-12. Diagram showing evaporator construction with ethanol channels on the outside and exhaust channels running in the center. (5.67) For the representative point, the ratio of heat capacity rates for the single-phase section is 0.777 and the heat exchanger effectiveness is 80.0%, which yields an NTU value of 2.80 and a total thermal resistance of 0.021 K W-1. The rectangular ducts for both the coolant and exhaust sides of the heat exchanger can be represented by finned sets of plates between which the fluids flow in alternating layers, with the cold side (ethanol) flowing through the outer layers to minimize heat loss to the environment. The total thermal resistance for the evaporator heat transfer is as follows: The primary difference compared to the condenser model is the addition of fins on the coolant side of the heat exchanger to increase heat transfer as the ethanol becomes a vapor. The heat transfer coefficients for both exhaust and coolant in the single-phase stage of the evaporator are found using the Nusselt number relation given in equation (5.49). The Nusselt 1expNTU1C ε= rC1 1C expNTU1C r rr R 1 1 tw,evap 1 (5.68) evap,tot UA h A k A h A evap o,evap,eth evap,eth s,eth w,evap w,avg o,evap,exh evap,exh s,exh 105PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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