Explanation Heat transfer area is the most important parameter for the given heat transfer device.To calculate fin effectiveness or each fin,surface area of the fin and occupied area without finhas to be calculated. Table 3-3 explained equations for the fin area and fin efficiency. Calculation: Where, w - fin width L - fin height t - fin base thickness A f i n - fin area for each fin A n o f i n - area occupied by without fin Calculation for areas, A f i n = 2 w L 2 + ( t 2 ) 2 A f i n = 2 × 0.11 × 0.055 2 + ( 0.004 2 ) 2 = 0.0121 m 2 Fin efficiency is given as, η f i n = 1 m L I 1 ( 2 m L ) I 0 ( 2 m L ) , w h e r e m = 2 h k t = 2 × 25 236 × 0.004 = 7.28 η f i n = 1 7.28 × 0.055 × I 1 ( 2 × 7.28 × 0.055 ) I 0 ( 2 × 7.28 × 0.055 ) η f i n = 2.5 × I 1 ( 0.8008 ) I 0 ( 0.8008 ) ≈ 2.5 × I 1 ( 0.8 ) I 0 ( 0.8 ) w h e n x = 0

6th Edition

ISBN: 9781260440027

Author: CENGEL

Publisher: MCG

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Question

Chapter 3, Problem 199P

To determine

To find:efficiency, heat transfer rate and effectiveness of each fin.

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Chapter 3, Problem 198P

Chapter 3, Problem 200P

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Chapter 3 Solutions

HEAT+MASS TRANSFER:FUND.+APPL.(LOOSE)

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A and B, with the same surface...Ch. 3 - Prob. 218P Ch. 3 - A room at 20C air temperature is losing heat to...Ch. 3 - Prob. 220P Ch. 3 - A 1-cm-diameter, 30cm-long fin made of aluminum...Ch. 3 - A hot surface at 80C in air at 20C is to be cooled...Ch. 3 - A cylindrical pin fin of diameter 0.6 cm and...Ch. 3 - A 3-cm-long. 2-nuti x 2-mm rectangular...Ch. 3 - Two finned surfaces with long fins are identical,...Ch. 3 - A 20-cm-diameter hot sphere at 120C is buried in...Ch. 3 - A 25-cm-diameter, 2.4-rn-long vertical cylinder...Ch. 3 - Prob. 228P Ch. 3 - The walls of a food storage facility are made of a...Ch. 3 - The equivalent thermal resistance for the thermal...Ch. 3 - Prob. 231P Ch. 3 - Prob. 232P Ch. 3 - Prob. 233P Ch. 3 - The fin efficiency is defined as the ratio of the...Ch. 3 - Prob. 235P Ch. 3 - In the United States, building insulation is...Ch. 3 - Prob. 237P Ch. 3 - A plane brick wall (k=0.7W/m.K) and is 10 cm...Ch. 3 - The temperature in deep space is close to absolute...Ch. 3 - In the design of electronic components, it is...Ch. 3 - Using cylindrical samples of the same material,...Ch. 3 - Find out about the wall construction of the cabins...Ch. 3 - Prob. 243P Ch. 3 - A house with 200-m2 floor space is to be heated...

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