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Full text of "The Flow Of Gases In Furnaces"

268

APPENDIX VII

TABLE IS—Continued


	Gas Checker
	Air Checker

The heat surface per pass was computed as ..... The corrected value for total heating surface will be : For gas- 3 556X720 =
	3 m2 556 2560 m2 00
	3 m2 556

For air* 3 556X 1200 =    .............
	
	4267 m2 20

The corrected total area of the passes will be: For gas* 0 0162X 720 =
	27,558 sq ft 11 m2 664
	45,935 sq ft

For air- 0 0162X1200=       ..........
	
	19 m244

The corrected average velocity per second of the gases will be : For gas: 21 92-r-ll 664= .................
	125. 58 sq ft 1 m 879
	209.32sq ft

For air* 31 93-f-19 44 =
	
	1 m 642

For waste gases: 28 05 -r- 11 . 664 ............
	6.17ft 2 m 405
	5.38ft

38 18-^19 44  =
	
	1 m 964


	6.71ft
	6.44ft

TABLE 19


	Gas on Gas
	Air on Air
	Gas on Waste Gas
	Air on Waste Gas

The heat transfer, total per second,
	
	
	
	

in calories is. .
	1484
	2,618
	1990
	3,516

in B.t.u. is   .............
	5900
	10,400
	7900
	13,900

Calories per sq m per second .....
	0.5797
	0.6135
	0.7773
	0.8239

B.t.u. per sq ft per second .......
	0.214
	0.226
	0.287
	0.306

Average temp, differential brick to
	
	
	
	

gas or gas to brick, C
	175°
	175°
	175°
	175°

F. .
	315°
	315°
	315°
	315°

Convection factor to still air, ac-
	f
	
	
	

cording to curve plotted from
	
	
	
	

Langmuir's   experiments   (Fig.
	
	
	
	

164) is calories per m2 per second
	0.294
	
	
	

Correction factor for velocity ==
	
	
	
	

/35+u
	2.516
	2.384
	2.803
	9  ^RQ

\   35       ...............
	
	
	
	u . O\J*j

v — velocity in cm per second.
	
	
	
	

Convection corrected for velocity:
	
	
	
	

in calories per m2 per second . . .
	0.7397
	0.7009
	0.8241
	0.7553

in B.t.u. per sq ft per second . . .
	0.273
	0.258
	0.304
	0.278