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274

APPENDIX VII


	Gas Checker
	Aii-Checker

Flues below checkerwork and walls : Chamber width .
	3 m 483
	5 m 763

Number of 115-mm walls                             .       .....
	5
	9

Number of 465-mm flues .........................
	6
	10


	
	


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

Fractional resistance in flues below checker work: t° = temp. below checkerwork. . .
 l-\-cd =
	500°
 2 835
	300° 2 101
	800° 3 936
	600° 3 202

Qo
	5m3   32
	8 m3   51
	5 m3   19
	7m3   58


	15m3   08
	17m3   88
	20m3   43
	24m3  27

B — width of flues total
	2 m 790
	4m 650
	2 m 790
	4m 650

H = height of flues
	1 m 000
	
	
	

Total length of chamber
	7m 663
	
	
	

The resistance to flow is about equivalent to the full volume for one-third of the length L =
	2.554
	
	
	

S= perimeter of flues, total. . .
	17.580
	29.300
	
	

65 = area of flues, total ........
	2.790
	4 650
	
	

SL = exposed surface m2 .......
	44.90
	74.83
	
	


	16.09
	16 09
	
	

AQ = specific weight gas
	1 125
	1 293
	1 32
	1 32

At=AQ~(l+at) =kg per m3. . .
	0.397 5 404
	0.615 3 84
	0.335
 7 324
	0.412 5 22

Y/= friction loss in kg per m2 = 0.016X16.09X5.404X0.397 =
	0 kg 553
	
	
	

0.016X16.09X3.840X0.615 =
	
	0 kg 548
	
	

0 016X16 09X7 324X0 335 =
	
	
	0 kg 632
	

0.016X16.09X5.220X0 412 =
	
	
	
	0 kg 554

The pressures requisite to impress their velocity on the gases in the flues below the checker-work: d=At(vt2+2g) =kg per m2= . . .
	0.590
	0.460
	0.916
	0.570