please answer my heat transfer problem thank you!! heat transfer problem for a furnace constructed with...
please answer my heat transfer problem thank you!!
heat transfer problem
for a furnace constructed with 0.7ft thick of fireclay brick having k=0.6 BTU/hr-ft-F and covered on the outer surface with a layer of insulating material of k=0.04BTU/hr-ft-F. The innermost surface is maintained at 1800 F while the outer surface of insulating material is maintained at 100 F, a. how thick must the insulator be to maintain a maximum allowable heat transfer rate of 300 BTU/hr-ft2 b. calculate the steady heat transfer per ft2
ans.
a. 0.2 ft
b. 464 BTU/hr-ft2
Homework Answers
Add Answer to:
please answer my heat transfer problem thank you!!
heat transfer problem
for a furnace constructed with...
please answer my heat transfer problem thank you!! heat transfer problem a furnace wall is constructed...
please answer my heat transfer problem thank you!! heat transfer problem a furnace wall is constructed of firrebrick 6in thick. The temperature of the wall is 1300F, and the T outside of the wall is 175 F. If the mean thermal conductivity under these conditions is 0.17 BTU/h-ft-F, what is the rate of heat loss through a 10 ft2 wall of the surface? ans. 3825 BTU/hr
Problem 9.43 The 4 m x 4 m horizontal roof of an uninsulated aluminum melting furnace...
Problem 9.43 The 4 m x 4 m horizontal roof of an uninsulated aluminum melting furnace is comprised of a 0.08-m-thick fireclay brick refractory covered by a 5-mm-thick steel (AISI 1010) plate. The refractory surface exposed to the furnace gases is maintained at 1700 K during operation, while the outer surface of the steel is exposed to the air and walls of a large room at 25 0C. the emissivity of the steel is 0.3. (a) What is...
Problem 1: A furnace has a 4 m high composite wall constructed of 4 cm thick...
Problem 1: A furnace has a 4 m high composite wall constructed of 4 cm thick fireclay brick on the inside, and 10 cm of oval-core concrete block with sand in the cores as the outer surface. The inside surface of the wall is at 400°C. The outer surface is exposed to quiescent air at 23°C (i.e., natural convection is occurring). What is the steady-state temperature of the outer surface of the wall? Use a film temperature of 400K to...
A 1.75-inch-diameter sphere with an emissivity of 0.95 is enclosed by a large surface with a...
A 1.75-inch-diameter sphere with an emissivity of 0.95 is
enclosed by a large surface with a temperature of 40oF.
If the surface of the sphere is maintained at 500oF,
find the heat transfer from the sphere if it is surrounded by
stagnant 90oF air.
Properties of air at 295oF:
k = 0.0203 Btu/(hr-ft-R)
Kinematic Viscosity = 1.113 ft2/hr
Pr = 0.689
A 1.75-inch-diameter sphere with an emissivity of 0.95 is enclosed by a large surface with a temperature of 40°F....
please answer as soon as possible! 2) Predict the boiling heat-transfer coefficient for water under pressure...
please answer as soon as possible!
2) Predict the boiling heat-transfer coefficient for water under pressure boiling at 250°F for a horizontal surface of 1/16-in-thick stainless steel having a k of 9.4 btu/h ft °F. The heating medium on the other side of this surface is a hot fluid at 290°F having an h of 275 btu/h ft2 °F. Use the simplified equations (20 points). Hint: You should start by guessing a value for Tw! Question 2 Solution: Tsat =...
The shield of a nuclear reactor can be idealized as a slab with a face area...
The shield of a nuclear reactor can be idealized as a slab with a face area of 6 ft2 and a thermal conductivity k = 2 Btu / hr*ft*°F. Heat is generated in the shield at a steady rate S = S0 exp(-bx) [Btu / hr*ft3 ] where x = 0 denotes the inner surface close to the nuclear reactor and the outer surface is at x = L. The temperature is maintained at 300 °F at the inner surface...
Flux Plotting S.1 A long furnace, constructed from refractory brick with a thermal conductivity of 1.2...
Flux Plotting S.1 A long furnace, constructed from refractory brick with a thermal conductivity of 1.2 W/m K, has the cross section shown with inner and outer surface tempera tures of 600 and 60°C, respectively. Determine the shape factor and the heat transfer rate per unit length using the flux plot method. 1.5m 2.5m
Heat Transfer -A wall 20 cm thick is to be constructed from material that has an...
Heat Transfer
-A wall 20 cm thick is to be constructed from material that has an average thermal conductivity of 2 W/m C. The wall is to be insulated with 5cm material having an average thermal conductivity of 0.5W/m C. Assuming that the inner and outer surface temperatures of the insulated wall are 200 and 20°C, calculate the heat transfer per unit area and the intermediate Temperature between the insulation and the wall.
Please help with this Mechanical Engineering Heat Transfer Problem. Please show all work! Thanks 4. Consider...
Please help with this Mechanical Engineering Heat Transfer
Problem. Please show all work! Thanks
4. Consider steady radial conduction in a long pipe (k = 1 W/m°C) with an inner radius of 5 cm and an outer radius of 10 cm. The inner surface of the pipe is maintained at 100°C while the outer surface is maintained at 50°C. Determine the following: ii) iii) iv) the rate heat transfer per unit length (W/m) the heat flux (W/m²) at the inner...
Heat Transfer Problems 1. A window pane (1/8 inch thick) in an old house owned by...
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
Problem 1: A furnace has a 4 m high composite wall constructed of 4 cm thick fireclay brick on the inside, and 10 cm of oval-core concrete block with sand in the cores as the outer surface. The inside surface of the wall is at 400°C. The outer surface is exposed to quiescent air at 23°C (i.e., natural convection is occurring). What is the steady-state temperature of the outer surface of the wall? Use a film temperature of 400K to...
A 1.75-inch-diameter sphere with an emissivity of 0.95 is
enclosed by a large surface with a temperature of 40oF.
If the surface of the sphere is maintained at 500oF,
find the heat transfer from the sphere if it is surrounded by
stagnant 90oF air.
Properties of air at 295oF:
k = 0.0203 Btu/(hr-ft-R)
Kinematic Viscosity = 1.113 ft2/hr
Pr = 0.689
A 1.75-inch-diameter sphere with an emissivity of 0.95 is enclosed by a large surface with a temperature of 40°F....
please answer as soon as possible!
2) Predict the boiling heat-transfer coefficient for water under pressure boiling at 250°F for a horizontal surface of 1/16-in-thick stainless steel having a k of 9.4 btu/h ft °F. The heating medium on the other side of this surface is a hot fluid at 290°F having an h of 275 btu/h ft2 °F. Use the simplified equations (20 points). Hint: You should start by guessing a value for Tw! Question 2 Solution: Tsat =...
Flux Plotting S.1 A long furnace, constructed from refractory brick with a thermal conductivity of 1.2 W/m K, has the cross section shown with inner and outer surface tempera tures of 600 and 60°C, respectively. Determine the shape factor and the heat transfer rate per unit length using the flux plot method. 1.5m 2.5m
Heat Transfer
-A wall 20 cm thick is to be constructed from material that has an average thermal conductivity of 2 W/m C. The wall is to be insulated with 5cm material having an average thermal conductivity of 0.5W/m C. Assuming that the inner and outer surface temperatures of the insulated wall are 200 and 20°C, calculate the heat transfer per unit area and the intermediate Temperature between the insulation and the wall.
Please help with this Mechanical Engineering Heat Transfer
Problem. Please show all work! Thanks
4. Consider steady radial conduction in a long pipe (k = 1 W/m°C) with an inner radius of 5 cm and an outer radius of 10 cm. The inner surface of the pipe is maintained at 100°C while the outer surface is maintained at 50°C. Determine the following: ii) iii) iv) the rate heat transfer per unit length (W/m) the heat flux (W/m²) at the inner...
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
Most questions answered within 3 hours.
-
What is the pressure inside a 33.0 L container holding 106.4 kg
of argon gas at...
asked 1 minute ago -
A 1400Kg sports car accelerates from rest to 90km/h in 7.0s.
What is the average power...
asked 39 minutes ago -
For the following reaction, 0.128 moles of
potassium hydrogen sulfateare mixed with
0.504 moles of potassium...
asked 4 hours ago -
1. What is the present value of $400, three years in the future
if the interest...
asked 4 hours ago -
The labor force minus the number of employed equals the number
of unemployed.
a. True
b....
asked 6 hours ago -
Determine the mass in units of grams [g] of 0.49 moles [mol]
of a new fictitious...
asked 7 hours ago -
A horizontal mass of M=5kg is on a spring and stretched to
x=0.5m when released from...
asked 8 hours ago -
26 of 50
"I have worked at the Arizona Humane Society for ten years, and
have...
asked 8 hours ago -
Compare and contrast zero based budgeting and incremental (or
base year) budgeting.
asked 8 hours ago -
4 pts 10. Which of the following hypothesis would be MOST
difficult to test experimentally? Group...
asked 8 hours ago -
A business owner makes 1,000 items a day. Each day he or she
contributes eight hours...
asked 8 hours ago -
A
circular loop in the plane of a paper lies inca0.65 T magnetic
field pointing into...
asked 9 hours ago