Question: A hot surface at 250C is to be cooled by attaching straight aluminum rectangular fins (k = 240 W/m K) with 25 mm length,

A hot surface at 250C is to be cooled by attaching straight

A hot surface at 250C is to be cooled by attaching straight aluminum rectangular fins (k = 240 W/m K) with 25 mm length, 50 mm width and 4 mm base thickness. Fins are exposed to an ambient air condition of 30C and heat transfer coefficient is 40 W/m2 K. If there are 2000 fins per m surface area, calculate; a. The heat transfer rate from a single fin. b. The increase in the rate of heat transfer per m? surface area as a result of attaching 2000 fins. c. Determine the overall effectiveness of the fins.

Step by Step Solution

★★★★★

3.54 Rating (157 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Mechanical Engineering Questions!

A 40-W power transistor is to be cooled by attaching it to one of the commercially available heat sinks shown in Table 176. Select a heat sink that will allow the case temperature of the transistor...

A hot surface at 100°C is to be cooled by attaching 3-cm-long, 0.25-cm-diameter aluminum pin fins (k = 237 W/m·K) to it, with a center-to-center distance of 0.6 cm. The temperature of the...

An electronic device is to be cooled by air flowing over aluminum fins attached to its lower surface as shown U?? = 10m/sT?? Air = 20?CThe device dissipates 5 W and the thermal contact resistance...

A hot surface at 250oC is to be cooled by attaching straight aluminum rectangular fins (k = 240 W/mK) with 25 mm length, 50 mm width and 4 mm base thickness. Fins are exposed to an ambient air...

Exhaust gases from a power plant are used to preheat air in a cross-flow heat exchanger. The exhaust gases enter the heat exchanger at 450?C and leave at 200?C. The air enters the heat exchanger at...

A long wooden rod at 38?C with a 2.5 cm diameter is placed into an airstream at 600?C. The heat transfer coefficient between the rod and air is 28.4 W/(m2 K). If the ignition temperature of the wood...

A Trombe wall is a masonry wall often used in passive solar homes to store solar energy. Suppose such a wall, fabricated from 20 cm thick solid concrete blocks (k = 0.13 W/(mK), = 0.05 \ 10 5 m 2 /s...

To more accurately model the energy input from the sun, suppose the absorbed flux in Problem 3.23 is given by q abs (t) = t (375 46.875 t) where t is in hours and q abs is in W/m 2 . (This time...

Due to a faulty door contact the small light bulb (25 W) inside a refrigerator is kept on and limited insulation lets 50 W of energy from the outside seep into the refrigerated space. How much of a...

Consider conditions for which a fluid with a free stream velocity of V = I m/s flows over a surface with a characteristic length of L = I m, providing an average convection heat transfer coefficient...

Let C denote the number of shortest lattice paths (lattice paths containing steps only to the right and/or up) from (0, 0) to (n. n) that do not go above the line y = x (i.e. paths that stay on or...

Compare the results obtained in Exercises 13. 78, 13.79, and 13. 92. Explain the similarities and differences. Why do you think the scatter diagram for number of items purchased and total sales shows...

What is a dividend clientele? All things considered, would you expect a risky firm with significant but highly uncertain growth prospects to have a low- or high-dividend payout?

DLet A= 2. Find 1- 2. O det (A) -/- 9 if b- Solve Ax=b A O det (A) O row space a Coulonn space 8null space O reduced echelon form

tion 2 The expression (7==5 ?4:3) evaluates to: vet ered Select one: ed out of O a. 4 .4 ag question O b. 1 c.0 O d. 3

-19 Assuming the following pseudocode for the Fibonacci series, what is the value of fibonacci ( 5 )? fibonacci( 0) = 0 fibonacci( 1) = 1 fibonacci( n) = fibonacci( n- 1) + fibonacci( n - 2) ed out...

29 The data type that represents fractions is double. Select one: put of O a. True question O b. False

estion 39 The minimum numbers of functions need to be presented in c++ progtam is 0? yet vered Select one: ked out of O a. False Flag question O b. True

Stedman's 2nd Edition Medical Terminology Chapter 13: Urinary System Across 3. One of several capillary clusters at the entrance of each nephron 4. Inflammation of the renal pelvis 9. Abbreviation...

2. (35 pts) A hot surface at 250C is to be cooled by attaching straight aluminum rectangular fins (k = 240 W/m K) with 25 mm length, 50 mm width and 4 mm base thickness. Fins are exposed to an...

2(30pts). A hot surface at 250C is to be cooled by attaching straight aluminum rectangular fins (k=240W/mK) with 25mm length, 50mm width and 4mm base thickness. Fins are exposed to an ambient air...

The outer surface of an engine is located in an area where oil leakage may occur. Some oils have autoignition temperatures around 2 5 0 C . If oil contacts a hot engine surface that exceeds its...

18.37 The severity of a burn on human skin is determined by the surface temperature of the hot object contacting the skin and the time of exposure. Skin is considered to be in a damaged state if its...

A large hot surface is positioned L = 0.2 m away from an equally large parallel surface with very low thermal conductivity. Previously. the hot surface was cooled by continuously pumping water along...

Reconsider Prob. 2030. Using an appropriate software, investigate the effects of the room temperature and the emissivity of the board on the temperature of the hot surface of the board for different...