Radiant energy with an intensity of 800 W/m2 strikes a flat plate normally. The absorptivity is twice the transitivity and thrice the reflectivity. Determine the rate ofabsorption, transmission and reflection of energy

Radiant energy with an intensity of 800 W/m2 strikes a flat plate normally. The absorptivity is twice the transitivity and thrice the reflectivity. Determine the rate ofabsorption, transmission and reflection of energy

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.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.61P

See similar textbooks

Related questions

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

Q: 21–121 The surface in Prob. 21–120 receives solar radia- tion at a rate of 470 W/m². Determine the…

A: Solar radiation on surface = 470 W/m2 Surface of the temperature = 5800 K

Q: EX3 Two coaxial cylinders of diameters D=0.10 m and D 0.30 m and emissivities 1 = 0.7 and 2=0.4 are…

Q: . A thin aluminum sheet with an emissivity of 0.15 on both sides is placed between two very large…

A: Given: Emissivity of top plate, ε1 = 0.5 Emissivity of bottom plate, ε2 = .8 Temperature of top…

Q: A person stands in front of a fire at 650 C in a room where air is at 5°C. Assuming the body…

A: Given data T = 650° C Temperature of air = 5°C Body temperature = 37°C Coefficient of conduction =…

Q: For approximate calculations, the sun may be considered a black body, emitting radiation with…

Q: EX3 Two coaxial cylinders of diameters D1 = 0.10 m and D2 = 0.30 m and emissivities 1 = 0.7 and 2 =…

A: Given: The diameter of two coaxial cylinders D1=0.10 m and D2=0.30 m, The emissivities are ε1=0.7…

Q: A person stands in front of a fire at 650°C in a room where air is at 5°C. Assuming the body…

A: Answer: The net heat flow from the body is 291.1 W.

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

Q: A 5-in-diameter spherical ball is known to emit radiation at a rate of 550 Btu/h when its surface…

Q: A thin aluminum sheet with an emissivity of 0.14 on both sides is placed between two very large…

Q: A small circular surface of area A1=2 cm2located at the center of a 2-m-diameter sphere emits…

A: Given:Surface area of the small circle,A1=2 cm2=2×10-4m2Diameter of sphere(blackbody),D=2mSo ,radius…

Q: Calculate the amount of radiation emitted for a unit surface (1 m2 ) forthe following situations:…

A: Write the expression to calculate the amount of radiation emitted by a surface. Q=σεAT4 Here, the…

Q: Two aligned parallel rectangles with dimensions 6 m * 8 m are spaced apart by a distance of 2 m. If…

Q: A radiator in a domestic heating system operates at a surface temperature of 55°C. Assuming the…

A: Given: Temperature = 55+273 = 328 K Emissivity = 1 (black body)

Q: A triangular duct whose surfaces are all black has a length of L=0.69 m. By considering the details…

Q: A circular ceramic plate that can be modeled as a blackbody is being heated by an electrical heater.…

A: The heat transfer to the plate due to convection,

Q: A spherical tank of diameter, D = 2 m that is filled with liquid nitrogen at 100 K is kept in an…

Q: Two long parallel plates of same emissivity 0.5 are maintained at different temperatures and have…

A: Given: The emissivity of two plates, ε1 = 0.5 The emissivity of radiation shield, ε2 = 0.25

Q: An oil radiator has an outside surface area of 0.18 m2 and operates at a surface temperature of 85…

Q: Two identical bodies radiate heat to each other. One body is at 30°C and the other at 250°C. The…

Q: 55. At what net rate does heat radiate from a 275-m² black roof on a night when the roof's…

A: As per given question T1=30° c T2=15°c A=0.900 m2 we have to find heat transfer by radiation

Q: Consider a 6 in-diameter spherical ball at 366 °C suspended in air. Assuming the ball closely…

A: Basics of Radiation heat transfer are used.

Q: A surface gains 500 W/m2 heat at an equilibrium temperature of 30 °C and it is subjected to a…

A: Given: Heat flux (q)=500W/m2Equilibrium surface temperature (Ts)=30°C or (273+30=303K)Temperature of…

Q: Two parallel plates (1mx0.5m) are maintained at uniform temperatures of T₁ = 1000K and T₂ = 500K and…

A: Area of both the plates, A1=A2=1 m* 0.5 m =0.5 m2Temperature of one plate, T1=1000 KTemperature…

Q: Assuming the sun to be a black body emitting radiation with maximum intensity at 1 = 0.48u m,…

Q: A small surface of area A1 = 5 cm? emits radiation as a blackbody, and part of the radiation emitted…

A: Given data: A1=5 cm2A2=8 cm2Q˙1-2=274×10-6 W Need to determine the intensity of radiation emitted by…

Q: The radiation coefficient hr in Btu/hr.ft2.°F of air that exists between two surfaces at uniform…

Q: 1.24 Asphalt pavements on hot summer days exhibit surface tempera- tures of approximately 50 C.…

A: Given Temperature, T = 50oC = 323 K Boltzman constant = 5.67 x 10-8 W/m2 K4

Q: A blackbody with a surface area of 1.0 m is subjected to the flow of a 10°C gas where the heat…

A: The total (convection plus radiation) heat transfer from the blackbody is 2616.7 W.

Q: Determine the fraction of the radiation leaving the base of the cylindrical enclosure that escapes…

A: Given data: Radius of the enclosure of surface 1, r1 = 10 cm Length of the enclosure, L = 10 cm…

Q: Explain the following terms related to the radiation mode of heat transfer: Black body, emissive…

A: To explain- Black body - Emissive power- monochromatic emissive power- gray body- white body- opaque…

Q: The view factor integral in radiation heat transfer between two bodies A, and A, is given by

A: View-factor: In radiation heat transfer, a view-factor is the ratio of the radiation heat transfer…

Q: Consider a 25-cm-diameter spherical ball at 700 K suspended in air and assume the emissivity of the…

Q: Consider a surface at a uniform temperature of 800 K. Determine the maximum ratio of thermal…

Q: Q11. 40% of incident radiant energy on the surface of a thermally transparent body is reflected…

A: To find: The emissivity of surface. Given: The transmissivity of the body is τ=0.15. The…

Q: 2. Two very long concentric cylinders of diameters D=0.35 m and D2=0.5 m are maintained at uniform…

Q: A diffuse surface at 500 K is placed in a large furnace which is kept at 1000 K have the following…

A: Heat transfer is the form of energy that transfers from one system to another system by the virtue…

Q: A furnace that has a 40-cm * 40-cm glass window can be considered to be a blackbody at 1200 K. If…

A: Given data Area of the glass window = Temperature of the furnace = 1200 K Transmissivity

Q: Two very large parallel plates are kept at uniform temperatures T1=800 K and T2=500 K, and have…

A: Given:T1=800 KT2=500 Kε1=0.2ε2=0.7

Q: (B) Two parallel plates (1mx0.5m) are maintained at uniform temperatures of T₁ = 1000K and T₂ = 500K…

Question

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

Step 2

Step 3

Step 4

Step 5

Trending now

This is a popular solution!

Step by step

Solved in 5 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

1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.
1.26 Repeat Problem 1.25 but assume that the surface of the storage vessel has an absorbance (equal to the emittance) of 0.1. Then determine the rate of evaporation of the liquid oxygen in kilograms per second and pounds per hour, assuming that convection can be neglected. The heat of vaporization of oxygen at –183°C is .
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.
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.
Two very large parallel plates are kept at uniform temperatures T1=800 K and T2=500 K, and have emissivities ε1=0.2 y ε2=0.7, respectively, as shown in the figure. Determine the net rate of radiation heat transfer between the two surfaces per unit surface area of the plates.
A copper ball of 20 cm diameter is kept outside open to sky during summer. The ball is capable of receiving and emitting heat by radiation. Identify the satisfactory conditions from the following to treat the ball as a block body. I) the emissivity and absorptivity of the ball should be equal to one II) the reflectivity and transmissivity of the ball should be equal to zero III) the ball should emit lesser the heat absorbed I only II only I and II only II and III only I, II and III
Consider a black spherical ball, with a diameter of 25 cm, is being suspended in air. Determine the surface temperature of the ball that should be maintained in order to heat 11.7 kg of air from 20°C to 30°C in the duration of 5 minutes.Given: cv = 718 J/kg∙K Stefan-Boltzmann constant (σ) = 5.67 × 10–8 W/m2∙K The surface temperature of the ball is Ts = _____ °C.
A radiator in a domestic heating system operates at a surface temperature of 55°C. Assuming the radiator behaves as a black body, the rate at which it emits the radiant heat per unit area is (assume o = 5.67 x 10-8 W/m²K4)
A small circular surface of area A1=2 cm2located at the center of a 2-m-diameter sphere emits radiation as a blackbody at T1= 1000 K. Determine the rate at which radiation energy is streaming through a D2=1-cm-diameter hole located (a) on top of the sphere directly aboveA1and (b) on the side of the sphere such that the line that connects the centres of A1 and A2 makes 45° with surface A1. (c) Repeat it for a 4-m diameter sphere.
2. A thin aluminum sheet with an emissivity of 0.15 on both sides is placed between two very large parallel plates, which are maintained at uniform temperatures T1 = 900 K and T2 = 650 K and have emissivities ?1 = 0.5 and ?2 = 0.8, respectively. Determine the net rate of radiation heat transfer between two plates per unit surface area of the plates and compare the result with that without the shield
A thin aluminum sheet with an emissivity of 0.14 on both sides is placed between two very large parallel plates maintained at uniform temperatures of T1=720 K and T2=560 K. The emissivities of the plates are ɛ1=0.76 and ɛ2=0.85. Determine the net rate of radiation heat transfer between the two plates per unit surface area of the plates, and the temperature of the radiation shield in steady operation.
Q#01:a) Define Radiation and give at least 3 examples.b) Define Stefan-Boltzmann Law and emissivity. Is there any surface whose emissivity valueis greater than 1? If no, explain the reason.