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Full text of "The Flow Of Gases In Furnaces"

256

APPENDIX VII

65 m2 00 (700 sq ft). The width might be reduced slightly by
increasing the length. There are advantages in reducing the span
of the roof, as well as disadvantages in making the furnace too
long, but it is possible that a length of 14 m 00 (45.90 ft) with a
width of 4 m 650 (15.25 ft), giving an area of 65 m2 11 (701 sq ft),
would be satisfactory.

The temperature in the heating chamber will be 1800 C.
(3272 F.) for the gases, the roof being 50 to 100 C. (90 to
180 F.) cooler, and the bath from 150 to 250 C. (270 to 450 F.)
cooler. The height of the chamber may be approximated by
Yesmann's formula

in which ht=the thickness of .the layer of gas in motion in meters

(or feet) ;
Qi=the volume of gas in cubic meters (or cubic feet) at

t temperature;

jB = the width of the furnace in meters (or feet);
A = &   coefficient  which   varies  for   each   value   of   h

and Bj
t = temperature Centigrade

TABLE 12

TABLE GIVING THE VALUES OF A FOR METRIC UNITS


	Values of B
		
ht
	1 mOO
	2 mOO
	5m 00

Om 30
	3.42
	3.54
	3.62

Om 50
	3.29
	3.46
	3.57

Om75
	3.13
	3.37
	3.54

1 m 00
	2.97
	3.28
	3.53

This formula may be translated to English units as follows: