Answered: Determine in W the radiation heat loss…

Determine in W the radiation heat loss from each meter of 20 cm diameter heating pipe when it is placed centrally in the brick duct of square section 30 cm side.

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 1.53P: Determine the power requirement of a soldering iron in which the tip is maintained at 400C. The tip...

See similar textbooks

Related questions

Q: A triangular duct whose surfaces are all black has a length of L=0.75 m. By considering the details…

Q: A solid sphere of radius R = 8.0 cm uniformly generates 5 × 10° W/m³ of heat within it. Surrounding…

Q: A plate-type solar energy collectorr with an absorbing surface covered by a glass is to receive an…

Q: 2. A spherical tank with internal diameter of 197-inches is made of 3-cm-thick stainless steel (k =…

A: Given: d=197 inchesri=2.5 mt= 3 cm = 0.03 mr0=2.5+0.03=2.53 mk=…

Q: Consider the radiation heat exchange inside an annuals between two very long concentric cylinders.…

A: To find: The radiation view factor. Given: The radius of outer cylinder is R0. The radius of inner…

Q: Consider a thin 16-cm-long and 20-cm-wide horizontal plate suspended in air at 20°C. The plate is…

A: Given data as per question Heating element rating = 20 w Plate emissivity = 0.9 Ambient temperature…

Q: The roof of an automobile can be thought of as a flat plate with insulated bottom surface. Solar…

Q: Two concentric spheres of diameters D1 = 0.3 m andD2 = 0.4 m are maintained at uniform temperatures…

A: The diagram of the concentric sphere is given as, The net rate of radiation is written as,

Q: s of the wafer are e = 0.65 an

A: Tsur,h = 1150 KTsur,c = 330 KEmmisivity, e = 0.65d = 0.78 mmT∞ = 700 Khu = 8 W/m2Khl = 4 W/m2K

Q: Find the intensity of the total radiation falling on a body in which the diffuse radiation is equal…

Q: Determine radiation heat loss from a steel tube of outside diameter 60 mm and 5m long at a…

A: Data given - d = 60 mm L = 5 m T1 = 327°C = 600 K T2 = 25°C = 298 K a = 0.4 m εsteel = 0.8…

Q: Two parallel square plates having 5 mm separation with each plate having 2 m² area. One of the…

A: Given Data: The gap between the plates is, t=5 mm. The area of both the plates is, A=2 m2. The…

Q: Ex2. Two large parallel plates are exchanging radiation. One plate has a temperature of 1000 K and…

Q: 1- what is the difference between the steady heat transfer and transient heat transfer? 2-Why is the…

A: 1) steady state heat transfer means the temperature does not vary with respect to time and the…

Q: hot liquid is filled in a spherical tank with an inner diameter of 3 m and a wall thickness of 3 cm.…

A: Data given - Tf = 40°C P= 1 atm Di = 3m t = 0.03 m

Q: Consider a silicon wafer positioned in a furnace that is zone-heated on the top section and cooled…

Q: Consider steady heat transfer between two large parallel plates at constant temperatures of T1 = 300…

Q: Two parallel rectangular surfaces 1m x 2m are opposite to each other at a distance of 4 m. The…

Q: Two very large walls are at constant temperature of 463oF and 887 oF. Assuming that the walls behave…

Q: A large isothermal enclosure containing two small surfaces (surface A and surface B) is shown in the…

A: Given: Irradiation = 10000 W/m2

Q: The outside surface of a satellite with an emissivity of 0.90 receives a solar radiant flux of 1260…

Q: A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient…

Q: Consider a thin suspended hotplate that measures 0.25 mx 0.25 m. The isothermal plate has a mass of…

Q: What is the heạt transfer coefficient for radiation (W/m -K) for the case of 2.5mm wire and length…

Q: A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient…

A: To find: The convective and radiative heat flux to the wall. Given: The ambient temperature is…

Q: In a bread-making factory, a 10-kW oven has a hearth area of 4 m2 and operates at 215 ºC. It is…

A: Given: Heat output of the oven=10kWHearth area=4m2Surface temperature of the oven=215°C or…

Q: A 3-m internal diameter spherical tank made of 2-cm-thick stainless steel (k = 15 W/m °C) is used to…

A: The emissivity of the black surface is 1. The value of the Stefan-Boltzmann constant is 5.67×10-8…

Q: a certain body at 20 C is display on a top of a building during the night. the body sees nothing but…

A: Given data, T1= 20°C = 293K T=23°C = 296 K To=110 K ε= 0.92 Let the Stefan Boltzmann constant…

Q: A hot water heater 150 mm wide, 2 m long and 1 m hight is at a surface temperature of 50°C in the…

Q: 2. A 2-meter section of a 2-cm diameter metal pipe passes through an enclosed furnace. The…

Q: Determine radiation heat loss from a steel tube of outside diameter 60 mm and 5m long at a…

Q: An 5-m·internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15 W/m·C) is used…

Q: Determine the heat flow between the roof and floor of 4 × 3 m size of a furnace of 4 m × 4 m × 3m…

Q: 40% of incident radiant energy on the surface of thermally transparent body is reflected back, if…

A: Let us represent, Reflectivity = ρ Transmissivity = τ Emissivity = α From the data given in…

Q: A 30-m-long hot rod (Diameter = 100-mm) is placed inside a room whose walls and air are at 25 C. The…

A: Given Data The diameter of rod is: d=100 mm=0.1 m The temperature of air is: Ta=25°C=298 K The…

Q: Consider a silicon wafer positioned in a furnace that is zone-heated on the top section and cooled…

Q: A 5-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15 W/m-°C) is used…

Q: Calculate the radiant heat loss per unit length, if the surface emissivity is 0.65.

Q: A certain body at 20C is displayed on a top of a building during the night. The body sees nothing…

A: Given Data The temperature of the body is: Tb=23°C=296 K The temperature of the sky is: Ts=110 K…

Q: An opaque surface which is insulated at the back side has a total, hemispherical absorptivity a=0.8…

A: Given, Absorptivity, α=0.8Emissivity, ε=0.2Heat flux, G=800W/m2Convective heat transfer…

Q: Consider a person whose exposed surface area is 1.7 m2, emissivity is 0.7, and surface temperature…

Q: 7- Consider a person standing in a room maintained at 20°C at all times. The inner surfaces of the…

Q: Determine the heat flow betwee the roof and floor of 4 x 3 m size of a furnace of 4 m x 4 m x 3 m…

A: Given, Temperature of roof, TR=1200K. Temperature of floor, Tf=600K. Emissivity at roof and floor,…

Q: A horizontal steam pipe with an outer surface temperature of 98°C and an outer diameter of 8 cm is…

A: Make a diagram as shown below of the horizontal steam pipe.

Concept explainers

Strengthening of Alloys

Strengthening of the alloys is required as metals become weak due to various lattice defects, metal bonding phenomena. The strength of the metals is not enough for any mechanical work. The internal dislocations of any metals arise due to forming processes. Due to the movement of these dislocations, the metals are plastically deformed.

Question

Determine in W the radiation heat loss from each meter of 20 cm diameter heating pipe when it is placed centrally in the brick duct of square section 30 cm side.

Temperature of pipe surface = 200°C

Brick duct temperature = 20°C

Emissivity of the pipe surface = 0.8

Brick duct emissivity = 0.9

Assume only radiation heat transfer between pipe and brick duct.

If the system is in steady-state condition then find the surface heat transfer coefficient of the brick duct assuming the temperature of the surroundings of the duct is 10°C.

Expert Solution

This question has been solved!

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

SEE SOLUTION Check out a sample Q&A here

Given Data

Step 1

Step 2

Step 3

Step by step

Solved in 4 steps

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

8.15 A mercury bath at is to be heated by immersing cylindrical electric heating rods, each 20 cm tall and 2 cm in diameter. Calculate the maximum electric power rating of a typical rod if its maximum surface temperature is .
Determine the power requirement of a soldering iron in which the tip is maintained at 400C. The tip is a cylinder 3 mm in diameter and 10 mm long. The surrounding air temperature is 20C, and the average convection heat transfer coefficient over the tip is 20W/m2K. The tip is highly polished initially, giving it a very low emittance.
A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The satellite generates 1000 W of internal power from a small nuclear generator. If the surface of the satellite has an emittance of 0.3, and is shaded from solar radiation by the earth, estimate its surface temperature.
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.
Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.
Determine the heat flow between the roof and floor of 4 x 3 m size of a furnace of 4 m x 4 m x 3 m size when the roof is at 1200 K and the floor is maintained at 600 K, with the other surfaces non absorbing and reradiating. The surface emissivity of the hotter surface is 0.8 and that of the cooler surface 0.6
Because you forgot to let the pipes drip during a freezing night, a section of an outdoor pipe is now frozen. The frozen section is L = 1 m long and the inner pipe diameter is D = 1.8 cm. During the day, the pipe is exposed to the cold air, the Sun, and the radiating surroundings. The cold air temperature is T∞ = -10°C, and has convection heat transfer coefficient h = 20 W/m2·K. The Sun provides solar irradiance of Gsun = 1350 W/m2. The steel pipe surface has absorptivity α = 0.6 and emissivity ε= 0.1. The surroundings, such as vegetation, houses, ground, etc. can be assumed to be blackbody held at Tsur = 280 K. A) Using the energy conservation system illustrated below, establish an equation that describes the stored energy in the section of frozen water (Est). B) Determine the amount of time needed to melt the ice in the pipe. Ice has density ρ= 920 kg/m3, and latent heat of fusion hsf = 334 kJ/kg. The ice is Tw = 0°C. Ignore conduction through the pipe walls – assume the pipe…
A group of 25 power transistors, dissipating 1.5 W each, are to be cooled by attaching them to a black-anodized square aluminum plate and mounting the plate on the wall of a room at 30°C. The emissivity of the transistor and the plate surfaces is 0.9. Assuming the heat transfer from the back side of the plate to be negligible and the temperature of the surrounding surfaces to be the same as the air temperature of the room, determine the size of the plate if the average surface temperature of the plate is not to exceed 50°C.
14. A 39-cm diameter sphere at a constant uniform temperature of 84°C is inside a room at a room temperature of 31°C. If the surface emissivity of the sphere is 0.87, what is the radiation heat transfer from the sphere to the room? Express your answer in W.
Determine the heat flow between the roof and floor of 4 × 3 m size of a furnace of 4 m × 4 m × 3m size when the roof is at 1200 K and the floor is maintained at 600 K, with the other surfaces non-absorbing and reradiating. The surface emissivity of the hotter surface is 0.8 and that of the cooler surface 0.6.
According to an Atomic Energy Commissionreport, a hydrogen bomb can be approximated as a large fireball at a temperature of 7200 K. You are to assess theimpact if such a bomb exploded 5 km above a city. Assumethe diameter of the fireball to be 1 km, and the blast to last15 s. Investigate the level of radiation energy people, plants,and houses will be exposed to and how adversely they will beaffected by the blast.