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to minimize heat loss to the environment. The total thermal resistance for the superheater heat transfer is as follows: R 1 1 tw,sh 1 (5.90) sh,tot UA h A k A h A sh o,sh,eth sh,eth sh,eth w,sh w,sh,avg o,sh,exh sh,exh sh,exh The thermal resistances for the superheater are similar to the resistances for the evaporator because both have fins present on the exhaust and coolant sides of the heat exchanger. The heat transfer coefficient for the exhaust side was found using the same Nusselt number correlation used in equation (5.70) for the evaporator model since the channel aspect ratios are identical. Entering the Nusselt number (Nush,exh) of 6.78 into equation (5.49) along with thermal conductivity (kexh) of 0.054 W m-1 K-1 from Table 5-14 and the hydraulic diameter (Dh,exh) of 2.6 mm from Table 5-15, the heat transfer coefficient for the representative point is 140 W m-2 K-1 on the exhaust side. The exhaust side heat transfer coefficient (hexh) along with the heat exchanger material thermal conductivity (kw) of 18.8 W m-1 K-1 and the fin thickness (tf) of 0.254 mm can then be used to solve equation (5.34), which produces an m value of 242. The resulting exhaust Figure 5-18. Left: Cross-section of ethanol channels in superheater. Right: Cross-section of exhaust channels in superheater. 116PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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