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DESIGN OF OPEN-HEARTH FURNACES

261

This last is reasonably close to the quantities arrived at,
providing Told referred to the chambers at one end only.

The weight of the checker brick will be determined upon the
basis of a temperature change of 100° C. (180° F.), 70 per cent
of the brick being considered effective. The average specific heat
of firebrick is about 0.25; its weight is about 1800 kg. per m3
(112 Ib per cubic foot).

The regenerator computations are made as follows:

TABLE 15


	Gas Checker on Gas
	Air Checker on Air
	Gas Checker on Waste
 Gases
	Air Checker on Waste Gase

Temp, top of checkerwork, C. . . . F ___ Temp, bottom of checker,   C. . . . F ___ Average temperature, C
	1200° 2192° 500° 932° 850°
	1200° 2192° 300° 572° 750°
	1600° 2912° 800° 1472° 1200°
	1600° 2912° 600° 1112° 1100°

F      .....
	1562°
	1382°
	2192°
	2012°

Temperature increase or decrease in checker, C   . . .
	700°
	900°
	800°
	1000°

F ..    .   . .........
	1260°
	1620°
	1440°
	1800°

Heat capacity in calories per cubic meter from curve (Fig. 184) : Waste gases at 1600° .........
	
	
	16,32
	1632

Air or gas at     1200° .- ........
	445
	646
	
	

Waste gases at    800° ........
	
	
	711
	

Waste gases at   600° .........
	
	
	
	518

Gas at                 500° .........
	166
	
	
	

Air at                   300° ......
	
	148
	
	

Calories absorbed by gas and air or given up by waste gases ..... Assuming 2 m3 00 (70.6 cu ft) of gas are burned: 279X2= . . .
	279 558
	492
	921
	1114

492X2= ..........
	
	984
	
	

Total: Required   558+ 984 = Available 921 + 1114 = Percentage required for gas: 558-^-1542 = .................
	15 36.19
	42
	20
	35

Percentage required for air: 984-4-1542= .................
	
	63.81