Consider a room with dimensions as in the sketch. Assuming all emissivities of surfaces are equal to 0.9 calculate the radiative heat transfer between the floor and the ceiling, if you know the surface temperature of the floor equal to 25°C and the surface temperature of the ceiling is equal to 10°C. Hint: Use an Excel spreadsheet to model the equation for the view factor. 3m 4m Sm

Consider a room with dimensions as in the sketch. Assuming all emissivities of surfaces are equal to 0.9 calculate the radiative heat transfer between the floor and the ceiling, if you know the surface temperature of the floor equal to 25°C and the surface temperature of the ceiling is equal to 10°C. Hint: Use an Excel spreadsheet to model the equation for the view factor. 3m 4m Sm

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...

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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.
Determine the total average hemispherical emissivity and the emissive power of a surface that has a spectral hemispherical emissivity of 0.8 at wavelengths less than 1.5m, 0.6 at wavelengths from 1.5to2.5m, and 0.4 at wavelengths longer than 2.5m. The surface temperature is 1111 K.
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.
11.41 Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 555 K and 278 K. The emissivity of all surfaces is 0.8.
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.