# Full text of "The Flow Of Gases In Furnaces"

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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

```