Question

A certain combustion engine is air-cooled and has a cylinder constructed of cast iron (k =...

A certain combustion engine is air-cooled and has a cylinder constructed of cast iron (k = 35 Btu/h ft °F). The fins on the cylinder have a length of 5/8 in and thickness of 1/8 in. The convection coefficient is 15 Btu/h ft °F. The cylinder diameter is 4 in. Calculate the heat loss per fin for a base temperature of 100°F. Now you have two options to improve the heat transfer, first to increase the length of the fins by 1/4 in, or second to decrease the thickness of the fins by 1/16 in. What option will improve the heat transfer best and why?

Engineering   Chemical-Engineering   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A 6.38-in-wide and 27-in-high vertical hot surface in 78°F air is to be cooled by a...
A 6.38-in-wide and 27-in-high vertical hot surface in 78°F air is to be cooled by a heat sink with equally spaced fins of rectangular profile. The fins are 0.08 in thick and 27 in long in the vertical direction and have a height of 1.2 in from the base. Consider base temperature to be 180°F. Given: The properties of air at 1 atm and the film temperature at 129°F. k = 0.01597 Btu/h.ft.°F v = 0.1975 x 10-3 ft2/s, Pr...
Steam at 350°F flows through a 3-in (ID) copper pipe having a thickness of 0.22 in....
Steam at 350°F flows through a 3-in (ID) copper pipe having a thickness of 0.22 in. The outside surface of the pipe is insulated with 1-in-thick layer of fiberglass and 0.008-in-thick layer of aluminum. The outside surface of the insulation is exposed to air at 130°F. The convection coefficients for steam and air are 25 and 12 Btu/h-ft2 -°F, respectively. The thermal conductivity of fiberglass is 0.022 Btu/h-ft-°F. a. Calculate the rate of heat transfer for 30-ft length of the...
Identify the following 1.An internal combustion engine wherein pure air is introduced into its cylinder. 2.It...
Identify the following 1.An internal combustion engine wherein pure air is introduced into its cylinder. 2.It is the amount of work to be done to produce a unit quantity of heat. 3.A type of engine which transforms heat into work. 4.Amount of work needed to in ergs to be performed to generate 1 calorie of heat. ? 5.The value of mechanical equivalent of heat in ft.lb/B.t.u. ? 6.A type of engine where the combustion takes place inside a cylinder. 7.The...
Temperatures of gases inside the combustion chamber of a four‑stroke automobile engine can reach up to...
Temperatures of gases inside the combustion chamber of a four‑stroke automobile engine can reach up to 1000 ∘C. To remove this enormous amount of heat, the engine utilizes a closed liquid‑cooled system that relies on conduction to transfer heat from the engine block into the liquid and then into the atmosphere by flowing coolant around the outside surface of each cylinder. Suppose that, in a particular 6‑cylinder engine, each cylinder has a diameter of 8.75 cm, a height of 11.0...
Temperatures of gases inside the combustion chamber of a four‑stroke automobile engine can reach up to...
Temperatures of gases inside the combustion chamber of a four‑stroke automobile engine can reach up to 1000 ∘C. To remove this enormous amount of heat, the engine utilizes a closed liquid‑cooled system that relies on conduction to transfer heat from the engine block into the liquid and then into the atmosphere by flowing coolant around the outside surface of each cylinder. Suppose that, in a particular 6‑cylinder engine, each cylinder has a diameter of 8.25 cm, a height of 11.3...
A piston cylinder contains 2 lbm of air and operates at a constant pressure of 400...
A piston cylinder contains 2 lbm of air and operates at a constant pressure of 400 psia. The initial volume is 1 ft.3 and the initial temperature is 100°F. The final volume is 4 ft.3 and the final temperature is 1780°F. Determine the work and its direction (in or out) and the heat transfer and its direction, in Btu/lbm.
Temperatures of gases inside the combustion chamber of a four-stroke automobile engine can reach up to...
Temperatures of gases inside the combustion chamber of a four-stroke automobile engine can reach up to 1000°C. To remove this enormous amount of heat, the engine utilizes a closed liquid-cooled system which relies on conduction to transfer heat from the engine block into the liquid and then into the atmosphere by flowing coolant around the outside surface of each cylinder. Assume you have a 6-cylinder engine, and each cylinder has a diameter of 9.00 cm and height of 11.6 cm...
Hot water enters a counter-flow double-pipe heat exchanger at 180F with a velocity of 5 ft/s....
Hot water enters a counter-flow double-pipe heat exchanger at 180F with a velocity of 5 ft/s. Cold water at 80F flows at 3 ft/s in the outer section of the exchanger. The diameter of the inner pipe is 1 inch, the pipe wall thickness is 1/8", and the outer pipe diameter is 2 inches. The overall heat transfer coefficient times area per unit length UA/L = 150 Btu/hr-ft-F. If the exchanger is 16 feet long, what is the exit temperature...
Consider an internal combustion engine like that used in automobiles. The most common fuel used here...
Consider an internal combustion engine like that used in automobiles. The most common fuel used here is gasoline which is a mixture of hydrocarbons, and an octane rating is given for standardization. Therefore, we will approximate gasoline as being composed of the hydro- carbon, octane, C8H18. Another fuel that is common in racing applications is nitromethane, CH3NO2, used in top fuel dragsters. Let’s consider the combustion of each fuel with oxygen in an internal combustion engine. Let the 8-cylinder engine...
Assume that we are working with an aluminum alloy (k = 180 W/moC) triangular fin with...
Assume that we are working with an aluminum alloy (k = 180 W/moC) triangular fin with a length, L = 5 cm, base thickness, b = 1 cm, a very large width, w = 1 m. The base of the fin is maintained at a temperature of T0 = 200oC (at the left boundary node). The fin is losing heat to the surrounding air/medium at T? = 25oC with a heat transfer coefficient of h = 15 W/m2oC. Using the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT