To answer such objections Mr. Aime Witz has established a complete
parallel between the two systems, in which he looks at the question from
a theoretical and practical and scientific and financial point of view.
Considered as a transformation apparatus, a steam motor burning good
Cardiff coal in a Galloway boiler with feed water heaters will consume
(with a good condensing engine utilizing an expansion of a sixth) from
1,100 to 1,250 grammes of coal per effective horse hour, which
corresponds to a rough coefficient of utilization of 9.7 per cent. A gas
generator supplying a gas motor burning Swansea anthracite and Noeux
coke, medium quality, will consume 516 grammes of anthracite and 90 of
coke to produce 2,370 liters of gas giving 1,487 heat units per cubic
meter. Of the 3,524 heat units furnished to the motor by the 2,370
liters of gas, the motor will convert 18 per cent. into disposable
mechanical work.
With the boiler, the gross rendering of the whole is 7 per cent. With
the gas generator it reaches 12.7 per cent. From a theoretical point of
view the advantage therefore rests with the gas generator and gas motor.
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