A rectangular parallelepiped consists of gray, diffuse, and flat surfaces, radiating with each other and nothing else. The surface temperatures are maintained at the specified values. There is a vacuum in the enclosure and thus, no other heat transfer mechanism except radiation exists. Use the given data to find the radiosity and the rate of heat transfer for each surface. Data: Length = 2 m, depth, 3 m, height 1 m, T1 = 100 C, T2 = 200 C, T3 = 250 C, T4 = 400 C, T5 = 500 C, T6 = 550 C, ε1 = 0.5, ε2 = 0.65, ε3 = 0.75, ε4 = 0.8, ε5 = 0.55, ε2 = 0.65, ε3 = 0.85. 35. A rectangular parallelepiped consists of gray, diffuse, and flat surfaces, radiat-ing with each other and nothing else. The surface temperatures are maintained atthe specified values. There is a vacuum in the enclosure and thus, no other heattransfer mechanism except radiation exists. Use the given data to find the radios-ity and the rate of heat transfer for each surface. Data: Length = 2 m, depth, 3 m,height 1 m, T = 100 C, T2 = 200 C, T3 = 250 C, T4 = 400 C, T3 = 500 C, T, = 550C, & = 0.5, E = 0.65, ɛz = 0.75, ɛ = 0.8, ɛ3 = 0.55, & = 0.65, Ez = 0.85.%3D%3D

A rectangular parallelepiped consists of gray, diffuse, and flat surfaces, radiating with each other and nothing else. The surface temperatures are maintained at the specified values. There is a vacuum in the enclosure and thus, no other heat transfer mechanism except radiation exists. Use the given data to find the radiosity and the rate of heat transfer for each surface. Data: Length = 2 m, depth, 3 m, height 1 m, T1 = 100 C, T2 = 200 C, T3 = 250 C, T4 = 400 C, T5 = 500 C, T6 = 550 C, ε1 = 0.5, ε2 = 0.65, ε3 = 0.75, ε4 = 0.8, ε5 = 0.55, ε2 = 0.65, ε3

A rectangular parallelepiped consists of gray, diffuse, and flat surfaces, radiating with each other and nothing else. The surface temperatures are maintained at the specified values. There is a vacuum in the enclosure and thus, no other heat transfer mechanism except radiation exists. Use the given data to find the radiosity and the rate of heat transfer for each surface. Data: Length = 2 m, depth, 3 m, height 1 m, T1 = 100 C, T2 = 200 C, T3 = 250 C, T4 = 400 C, T5 = 500 C, T6 = 550 C, ε1 = 0.5, ε2 = 0.65, ε3 = 0.75, ε4 = 0.8, ε5 = 0.55, ε2 = 0.65, ε3

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 1.24P: Two large parallel plates with surface conditions approximating those of a blackbody are maintained...

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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 .
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.
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.
11.31 A large slab of steel 0.1 m thick contains a 0.1 -m-di- ameter circular hole whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, and the surroundings are at 300 K.
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.
1.25 A spherical vessel, 0.3 m in diameter, is located in a large room whose walls are at 27°C (see sketch). If the vessel is used to store liquid oxygen at –183°C and both the surface of the storage vessel and the walls of the room are black, calculate the rate of heat transfer by radiation to the liquid oxygen in watts and in Btu/h.
1.47 A flat roof is modeled as a flat plate insulated on the bottom and placed in the sunlight. If the radiant heat that the roof receives from the sun is , the convection heat transfer coefficient between the roof and the air is 12 W/m2 K, and the air temperature is , determine the roof temperature for the following two cases: (a) Radiative heat loss to space is negligible, (b) The roof is black and radiates to space, which is assumed to be a black- body at 0 K.