Читать книгу Maxims and Instructions for the Boiler Room - N. Hawkins - Страница 15
Table of Evaporation.
ОглавлениеIn order to arrive at the money value of the various fuels heretofore described a method of composition has been arrived at which gives very accurately their comparative worth. The rule is too advanced for this elementary work, but the following results are plainly to be understood, and will be found to be of value.
| Lbs. of Fuel. | Temperature of Water 212° | ||
|---|---|---|---|
| Coal, | 14.62 | lbs of Water. | |
| Coke, | 14.02 | „ | |
| Wood, | 8.07 | „ | |
| Wood; 25% of water, | 6.05 | „ | |
| Wood Charcoal, | 13.13 | „ | |
| Peat, perfectly dry, | 10.30 | „ | |
| Peat, with 25% moisture, | 7.41 | „ | |
| Peat, Charcoal (dry), | 12.76 | „ | |
| Tan, dry, | 6.31 | „ | |
| Tan, 30% moisture, | 4.44 | „ | |
| Petroleum, | 20.33 | „ | |
| Coal gas 1 lb. or (311⁄3 cub. feet) | 47.51 | „ |
The way to read this table is as follows: “one lb. coal has an average evaporative capacity of 14.62 lbs. of water,” or
One lb. of peat with one-quarter moisture will evaporate, if all the heat is utilized 7.41 lbs. of water.
In practice but little over half of these results are attained, but for a matter of comparison of the value of one kind of fuel with another the figures are of great value; a boiler burning wood or tan needs to be much larger than one burning petroleum oil.
