Question

Consider a circular grill whose diameter is 24 inches. The bottom of the grill is covered with hot coal bricks at 1250F, while the wire mesh on top of the grill is covered with steaks initially at 41F. The distance between the coal bricks and the steaks is 12 inches. Tinfoil (which is totally reflective) is wrapped around the open part of the grill so no radiation escapes

Using table 21-3 of the text find the view factor from the coals to the tinfoil to three significant digits, include leading zeros .

What is the total radiative resistance between the coals and the steaks in ft ^-2 to three significant digits?

Treating both the steaks and the coal bricks as blackbodies, determine the rate of radiation heat transfer from the coal bricks to the steaks in Btu/hour to three significant digits

Answer 1

Page No!- Given dosai- Diatone blo the al eicks omd the Sleaks L 12 inche TemPsol uores of the hot Coal bunicks, T, :12 oF (a) find view fact לכ F, 2 , nd +R2

e No2 11 12 2 213-2, 2 360C 0.3819 buicks to tha steakS is depenmined as r450w

Page No!-3 The missive Ri«is ae 46182.Sm 339 wm glace edstomce ose 02827 X0 3819 - 9-26m And Ris R23 o2827I-0 3817 524 m-2

Then heat oe ale becom o 46182.S 339 895 io .