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equation was used to find the louver pitch Reynolds number (Rep,lv), which was determined to be 162 at and air speed (vair,max) of 3 m s-1 for all cases: Re vair,max plv ρair (5.35) plv μ The Chang and Wang correlation for the dimensionless heat transfer coefficient j is of the following form: 0.49 0.27 pf 0.14 Lf 0.29 wt 0.23 Llv 0.68 pt 0.28 tf 0.05 jReplv (5.36) 90 plv plv plv plv plv plv From the values in Table 5-10 for the representative point, the Colburn j factor is found to be 0.037. The heat transfer coefficient was then found using the following set of equations [49]: jStPr2/3 (5.37) St hair Gair cp,air Pr = μair αair ρair h j αairρair 2/3 air G c μ air p,air air (5.38) (5.39) (5.40) Substituting equations (5.38) through (5.40) into equation (5.37) and solving for the air side heat air transfer coefficient yields: Gair ρairvair,max (5.41) Therefore, using the values in Table 5-10, the air side heat transfer coefficient (hair) is found to be 141 W m-2 K-1. The air side heat transfer coefficient (hair) along with the tube material thermal 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 produces an m value of 108. The resulting fin efficiency (f) for the representative model is 91.3%. From equation (5.29), the efficiency for the entire fin array is 93PDF Image | WASTE HEAT RECOVERY FROM A HIGH TEMPERATURE DIESEL ENGINE
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