TAILIEUCHUNG - 2001 Fundamentals Part 2

Tham khảo tài liệu '2001 fundamentals part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Heat Transfer FIN EFFICIENCY Fig. 18 Efficiency of Several Types of Straight Fin Fig. 16 Efficiency of Annular Fins of Constant Thickness Fig. 19 Efficiency of Four Types of Spine ratio of the fin tip-to-root radii . Figure 21 gives Omax for rectangular fins of a given geometry as determined by the sector method. Figure 22 gives correction factors 0 Omax for the determination of ofrom omax for both annular and rectangular fins. Example. This example illustrates the use of the fin resistance for a rectangular fin typical of that for an air-conditioning coil. Given L 18 mm to mm W 12 mm h 60W m2-K ro 6 mm k 170W m-K Solution From Figure 18 at W ro and L W Omax Rf max tok W . _ _2 X 12 2 __ f max 0. - 5 X- 1 70 X 1 000 m Kỵ v The correction factor 0 Omax which is multiplied by Rf max to give Rf is given in Figure 22 as a function of the fin efficiency. As a first approximation the fin efficiency is calculated from Equation 54a assuming Rf Rf max . 1 1 hRf Fig. 17 Efficiency of Annular Fins with Constant Metal Area for Heat Flow Heat Transfer FIN EFFICIENCY Fig. 16 Efficiency of Annular Fins of Constant Thickness Fig. 18 Efficiency of Several Types of Straight Fin Fig. 19 Efficiency of Four Types of Spine ratio of the fin tip-to-root radii . Figure 21 gives Omax for rectangular fins of a given geometry as determined by the sector method. Figure 22 gives correction factors 0 Omax for the determination of ofrom omax for both annular and rectangular fins. Example. This example illustrates the use of the fin resistance for a rectangular fin typical of that for an air-conditioning coil. Given L 18 mm to mm W 12 mm h 60W m2-K ro 6 mm k 170W m-K Solution From Figure 18 at W ro and L W Omax Rf max tok W . _ _2 X 12 2 __ f max 0. - 5 X- 1 70 X 1 000 m Kỵ v The correction factor 0 Omax which is multiplied by Rf max to give Rf is given in Figure 22 as a function of the fin efficiency. As a first .

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