Two very long cylindrical rods with a diameter of 20 cm are placed in parallel at a distance of 60 cm from each other. Both cylinder rods are black bodies and have temperatures of 425 K and 275 K. The medium surrounding the two parallel cylinders is also a black body and has a temperature of 300 K. For 1 m of the cylinders; a) Calculate the rate of heat transfer by radiation between the cylinders. b) Calculate the rate of radiation heat transfer between the hot cylinder and its surroundings.

Two very long cylindrical rods with a diameter of 20 cm are placed in parallel at a distance of 60 cm from each other. Both cylinder rods are black bodies and have temperatures of 425 K and 275 K. The medium surrounding the two parallel cylinders is also a black body and has a temperature of 300 K. For 1 m of the cylinders; a) Calculate the rate of heat transfer by radiation between the cylinders. b) Calculate the rate of radiation heat transfer between the hot cylinder and its surroundings.

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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1.28 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.
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.
Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.
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.
11.68 Two infinitely large, black, plane surfaces are 0.3 m apart, and the space between them is filled by an isothermal gas mixture at 811 K and atmospheric pressure. The gas mixture consists of by volume. If one of the surfaces is maintained at 278 K and the other at 1390 K, calculate (a) the effective emissivity of the gas at its temperature, (b) the effective absorptivity of the gas to radiation from the 1390 K surface, (c) the effective absorptivity of the gas to radiation from the 278 K surface, and (d) the net rate of heat transfer to the gas 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.