A horizontal uninsulated steam pipe passes through a large room whose walls and ambient air are at 300 K. The pipe of 125-mm diameter has an emissivity of 0.85 and an outer surface temperature of 373 K. Calculate the rate of heat loss per unit length from the pipe.

A horizontal uninsulated steam pipe passes through a large room whose walls and ambient air are at 300 K. The pipe of 125-mm diameter has an emissivity of 0.85 and an outer surface temperature of 373 K. Calculate the rate of heat loss per unit length from the pipe.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.32P: A long wire 0.7 mm in diameter with an emissivity of 0.9 is placed in a large quiescent air space at...

See similar textbooks

Related questions

Q: A tank with a volume of 3.5 m is filled with carbon monoxide at 53°C and 170 kPa is connected…

Q: A machine shaft supported on bearings 11 ft apart is to transmit 288 hp at 200 rpm while subjected…

A: given; transmitted power (P)=288hp =214.76kw…

Q: Calculate the forces in members BC, BE, and EF. Solve for each force from an equilibrium equation…

Q: Mechanics of Deformable Bodies The rigid beam of negligible weight is supported by a pin at o and…

Q: The truss supports the vertical load P at joint D. Determine the force in members GC, GE, BC, CD, DE…

Q: The kinematic viscosity of the fluid depends on O 1. Surface tension O 2. Vapor pressure 3. None of…

A: The kinematic viscosity of the fluid depends on Answer: 4. Fluid temperature

Q: (B) Cylindrical Water cans (diameter 6.5cm and length 15cm) are to be cooled from initial…

A: Answer: The initial rate of cooling of the cylindrical water can: ◆ Horizontal orientation: 3.06227…

Q: 1. In the figure shown below, two blocks are connected by a solid strut attached to each block with…

A: find the minimum weight of A to prevent motion.

Q: Calculate the forces in members AC, AD, and DE for the loaded truss. Restraining link BC is…

Q: ermine the magnitudes of all pin reactions for the frame loaded as sh ume F-860 N, a - 695 mm, b -…

Q: If the bearing pads at A and B support only vertical forces, determine the factor safety for the…

Q: 3. 130 Consider a Rankine cycle with reheat as shown in the diagram, with state properties as Reheat…

A: as per guideline i have to solve only three subpart of your question

Q: An air-standard dual cycle has a compression ratio of 16. At the beginning of compression, p1 = 14.5…

Q: PROBLEM 2: Calculate the components of the forces at B and C. A P E b Given: P = 21 kN a = 1.2 m b =…

Q: 1.5An ideal Rankine cycle with reheat uses water as the working fluid. As shown in the figure below,…

A: Given data Cycle : Ideal Ranking cycle with reheatInlet condition of first turbine = 1600 lbf/in2…

Q: 14. A 3-ft-diameter log (s.g. = 0.82) divides two shallow ponds as shown in figure below. Compute…

A: Answer: ◆ Horizontal reaction: 2527.200 lb (left). ◆ Vertical reaction: 370.507 lb (upward).

Q: Determine the moment of inertia of the shaded area about the x-axis in two different ways. - 3.5a a…

Q: Air is contained in a piston-cylinder and is compressed in a reversible adiabatic manner from a…

Q: Determine the y-coordinate of the centroid of the shaded area. 65 mm 37° 37° 75 mm 65 mnt 45 mm 45…

Q: Determine the x- and y-coordinates of the centroid of the shaded area.

Q: diagram of ‘regeneration cycle’ and state the advantages and disadvantages of regeneration.

Q: By the method of this article, determine the moments of inertia about the x- and y-axes of the…

A: A trapezoidal area is given below,

Q: In a gas turbine, air at 15°C is compressed from 1.01 bar with a pressure ratio of 6/1. Afterward,…

Q: Calculate the components of the forces at B and C.

Q: What work is done on a level track in bringing the velocity of a train weighing 200 tons from zero…

A: Given : m = 200 tons =200000 kg v = 30 mi/hr = 13.41 m/s F = 12 lb/ton = 53.38 N/ton S = 5280 ft =…

Q: QI:A shaft carrying two pulleys I and 2, and supported on two bearings A and B. The shaft transmits…

Q: Determine the index of the polytrophic expansion of steam from 2.8 MPa at 340°C to 0.76 MPa at…

Q: Each of the links AB and CD is made of aluminum and has a cross-sectional area of 0.11 sq.in.…

Q: 3m 2m B 2000 N A 1500 N 3

Q: Steam is throttled to 0.1 MPa with 20- degrees of superheat. It is throttled to the pressure of 0.75…

A: Solution - Given data - Initial pressure of steam (P1) =0.75 MPa The final pressure of steam (P2) =…

Q: Calculate the equivalence ratio and the mole fractions of the products of the complete combustion of…

A: Given fuel is isooctane

Q: Which of the following statements is correct O 1. Friction factor is always a constant O 2, Friction…

A: Option :( 3 ) is correct Friction factor in turbulent flow depends on the pipe surface roughness

Q: Calculate the moment of inertia of the shaded area about the x-axis. 84 mm 84 mm 66 mm Answer: Iy =…

Q: Determine the moments of inertia about the y-axis of the circular area without and with the central…

Q: For what value Mof the clockwise couple will the horizontal component A, of the pin reaction at A be…

A: find the value of moment M when horizontal reaction at A is zero. find the value of horizontal…

Q: I- If a rigid body undergoing planar motion, it has at most II- Second moment of force (F.r) is…

A: To find :- Fill in the blanks

Q: Q# 2:1 Chapter 14: Gas vapor mixtures and air-Conditioning (Psychrometric chiart) CLO 4 dbity to…

Q: Determine the Q and W if 3 moles undergoes an isothermal process at T = 298.15 K which is a…

A: For isothermal process work done is given by the following formula, W=n*R'*T*ln(V2/V1) Where R' is…

Q: What is the name of the following statement: “When two systems are in thermal equilibrium with a…

Q: Determine the magnitudes of all pin reactions for the frame loaded as shown. Assume F = 660 N, a =…

A: Consider the free body diagram for the member ABC.

Q: Determine the value of n.

A: To find value n

Q: Consider the rectangular cardboard shown in the figure. If you cut a hole in the material, the…

Q: Explain this one of the assumptions in using the flexural and shearing stresses. -the beam is…

A: Always some assumptions are done before derivation or explanation of any formula related to normal…

Q: A closed cylindrical tank that is 2m in diameter and has a height of 8m contains 6m deep of oil with…

Q: How are you to calibrate the calipers? What is the essence of doing so?

A: Soln:- caliper calibration process :- 1. Firstly you should record the actual temperature and…

Q: Determine the magnitudes of all pin reactions for the frame loaded as shown. Assume F = 660 N, a =…

A: GivenF=660Na=675mmb=290mmθ=25oϕ=64o

Q: The assembly shown in the figure consists of a brass core (diameter d1 = 0.25 in.) surrounded by a…

Q: A train weighing 120 tons is pulled up a 2% grade. The train resistance is constant at 12 lb/ton.…

Q: Two cables of different materials have an initial length of 1 m and a cross-sectional area of 2x10…

Q: For the beam and loading shown, determine the minimum required width b, knowing that for the grade…

Question

Problem: Convection related

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

A long wire 0.7 mm in diameter with an emissivity of 0.9 is placed in a large quiescent air space at 270 K. If the wire is at 800 K, calculate the net rate of heat loss. Discuss your assumptions.
1.13 If the outer air temperature in Problem is –2°C, calculate the convection heat transfer coefficient between the outer surface of the window and the air, assuming radiation is negligible.
Three thin sheets of polished aluminum are placed parallel to each other so that the distance between them is very small compared to the size of the sheets. If one of the outer sheets is at 280C and the other outer sheet is at 60C, calculate the temperature of the intermediate sheet and the net rate of heat flow by radiation. Convection can be ignored.
1.11 Calculate the heat loss through a glass window 7-mm thick if the inner surface temperature is 20°C and the outer surface temperature is 17°C. Comment on the possible effect of radiation on your answer.
A loaf of bread having a surface temperature of 373 K is being baked in an oven whose walls and the air are at 477.4 K. The bread moves continuously through the large oven on an open chain belt conveyor. The emissivity of the bread is estimated to be 0.85, and the loaf can be assumed to be a rectangular solid 114.3 mm high × 114.3 mm wide × 330 mm long. Calculate the radiation heat-transfer rate (in SI and AES units) to the bread, assuming that it is small compared to the oven and neglecting natural convection heat transfer.
A horizontal steam pipe with an outside diameter of 60.0 mm passes through a large room whose walls are at a temperature of 298 K. The outer surface of the pipe wall has a surface temperature of 443 K and an emissivity of 0.8. The air temperature in the room is 303 K. Calculate the rate of heat loss per unit length of the pipe by radiation and natural convection.
A long electrical conductor of 10 mm diameter is concentric with a refrigerated cylindrical tube of 50 mm diameter whose surface has an emissivity of 0.9 and temperature of 27 °C. The electrical conductor has a surface emissivity of 0.6 and dissipates 6.0 W per meter length. Assuming that the space between the two surfaces is empty, calculate the surface temperature of the conductor.
A 4.0-cm-diameter sphere is heated to a temperature of 200°C and is enclosed in a large room at 20 C. Calculate the radiant heat loss if the surface emissivity is 0.6.
An electric hot plate is placed in a room which is maintained at a temperature of 297 K. The plate is maintained at a temperature of 403 K and has an emissivity of 0.8. If the plate surface resembles a circular disc of diameter 250 mm, electrical power consumed by the hot plate will be?
A long, horizontal, cylindrical steel reactor, 1 m in diameter, has a surface temperature of 300ºC. The emissivity of the steel is 0.6, and the heat transfer coefficient for natural convection is 5 W m−2 K−1 . Heat is lost by convection to the air at 15ºC, and also by radiation to the surroundings, which can be considered to be a black body at 15ºC. a) Calculate the total heat loss per metre length of the reactor, and the proportions lost by convection and radiation. b) The reactor is then insulated with a thin layer of insulation material to reduce the total heat loss to one-tenth of its original value. This causes the surface temperature of the steel to rise to 400ºC. The thermal conductivity of the insulation is 0.01 W m−1 K−1 , and its surface emissivity is 0.2. Show that the resulting surface temperature of the insulation is about 89ºC, and calculate the thickness of insulation required, stating any assumptions made. can you solve part b please?
A long, horizontal, cylindrical steel reactor, 1 m in diameter, has a surface temperature of 300ºC. The emissivity of the steel is 0.6, and the heat transfer coefficient for natural convection is 5 W m−2 K−1 . Heat is lost by convection to the air at 15ºC, and also by radiation to the surroundings, which can be considered to be a black body at 15ºC. a) Calculate the total heat loss per metre length of the reactor, and the proportions lost by convection and radiation b) The reactor is then insulated with a thin layer of insulation material to reduce the total heat loss to one-tenth of its original value. This causes the surface temperature of the steel to rise to 400ºC. The thermal conductivity of the insulation is 0.01 W m−1 K−1 , and its surface emissivity is 0.2. Show that the resulting surface temperature of the insulation is about 89ºC, and calculate the thickness of insulation required, stating any assumptions made. Specifically need help with part b
Heat is generated in a sphere of radius 1 m at a rate of 1000 W/m3. The sphere is surrounded by air at 27 oC.A. Balance total energy produced by the total energy lost from the surface by convection and radiation tocalculate the surface temperature.B. Solve the heat transfer problem in the sphere and use the temperature calculated in A as the boundarycondition to determine the temperature at the center of the sphere.Assume that the sphere can be treated as a black body for calculating radiation losses.Properties The thermal conductivity is given to be k =2.5 W/m°C.σ = 5.67 × 10−8 W / (m2 x K4). Heat transfer coefficient h = 10 W/(m2 K)