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conductivity (kw) of 240 W m-1 K-1 and the fin thickness (tf) of 0.1 mm can then be used to solve equation (5.34) which results in an m value of 136. The resulting air side fin efficiency (f) for the representative model is 87.0%. From equation (5.29), the efficiency for the entire fin array is 90.8%. The equations for pressure drop given in the condenser section (equations (5.42) through (5.47)) are also utilized for the oil cooler due to the identical fin configuration. The air side louver Reynolds number is 277, and coupled with the fin dimensions in Table 5-17, the friction factor is 0.205. For the representative point, the air mass flux is 5.12 kg m-2 s-2, the air density is 0.994 kg m-3, and the hydraulic diameter is 4.50 mm, yielding an air side pressure drop of 449 Pa m-1. Finally, the heat exchanger surface area formulae (equations (5.74) through (5.78)) are solved to determine the required oil cooler length. From the results described for the representative point, the required oil channel surface area is 0.448 m2 and the required air channel surface area is 1.28 m2, requiring an oil cooler length of 0.228 m. This length results in total oil and air pressure drops of 229 Pa and 102 Pa, respectively. 5.3.6 Radiator The 90°C engine coolant temperature systems do not recover waste heat from the engine coolant and, therefore, the engine still requires a radiator to reject the heat necessary to keep the engine at the proper operating temperature. Since the radiator is displaced in the high-temperature systems, it is important to consider the size of the radiator in the analysis of WHR footprint. The radiator design is identical to the oil cooler design, with a cross-flow, compact heat exchanger configuration chosen to maximize air side heat transfer and keep air side pressure drop low (Figure 5-25). The engine coolant was assumed to be a 50/50 mix of water and EG, which flows through the tubes with rectangular channel cross-section. In between the tubes, louvered fins increase heat transfer on the air-side of the heat exchanger (Figure 5-26). The channel dimensions are identical 128PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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