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factor of 2.09. With a liquid side ethanol mass flux of 4.32 kg m-2 s-1, a density of 701 kg m-3, the hydraulic diameter of 2.6 mm, the pressure drop per unit length is 10.7 Pa m-1. Finally, the heat exchanger surface area formulae (equations (5.74) through (5.78) are solved to determine the required recuperator length. From the results described for the representative point, the required vapor side channel surface area is 1.09 m2 and the required liquid side channel surface area is 1.36 m2, requiring a recuperator length of 0.269 m. The resulting total vapor and liquid pressure drops are 56.1 Pa and 2.88 Pa, respectively. The final section of this chapter will provide details on the oil cooler models. 5.3.5 Oil Cooler As the engine coolant temperature increases, there will be greater heat rejection to the engine oil due to its lower temperature. This additional heat must then be rejected to the ambient air to maintain reasonable oil temperatures, which will require an oil cooler. The oil cooler dimensions scale with the magnitude of the required heat rejection and therefore may have a significant impact on packaging. Therefore, oil coolers were modeled for each engine coolant temperature. The construction and dimensions of the oil cooler models are shown in Table 5-17, with the representative point inputs presented in Table 5-18. The oil cooler construction is like the condenser described in sub-section 5.3.1 with a compact aluminum cross-flow heat exchanger design (Figure 5-22). Like the condenser, the oil cooler air-side uses louvered fins to increase heat transfer (Figure 5-23). The primary difference between the oil cooler and the condenser is the channel design. Instead of microchannels used in the condenser, the oil cooler uses rectangular tubes with fins separating the tube into individual channels to increase heat transfer, but with less pressure drop than the microchannels used in the condenser (Figure 5-24). The oil channels have a width of 2.5 mm and a height of 11.7 mm, giving a hydraulic diameter of 4.15 mm. The oil cooler 123PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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