Combustion heat and calorific value of wood versus humidity
Combustion heat and calorific value of wood versus humidity.
| Humidity [%] |
Value fuel wood [GJ / t] |
| 0 | 19,00 |
| 15 | 15,79 |
| 20 | 14,72 |
| 25 | 13,72 |
| 30 | 12,58 |
| 35 | 11,51 |
| 40 | 10,44 |
| 45 | 9,37 |
| 50 | 8,20 |
| 55 | 7,23 |
| 60 | 6,16 |
If you purchase “by weight” will be performed by the user, which will allow the wood to dry then the calculation can be made as follows in Example 2.
Table. The calorific value of wood – different species.
| LP | TYPE
WOOD |
kg/mpu water 25% | kg/mpu fresh wood | l/mpu
evaporated water |
GJ/mpu calorific value |
| 1 | PLUM | 576 | 10.13 | ||
| 2 | GRAB | 570 | 700 | 130 | 10.00 |
| 3 | ACACIA | 530 | 627 | 97 | 9.15 |
| 4 | MOUNTAIN ASH | 511 | 700 | 189 | 8.98 |
| 5 | PEAR | 504 | 750 | 246 | 8.86 |
| 6 | BUK | 490 | 750 | 260 | 8.61 |
| 7 | OAK | 475 | 715 | 250 | 8.35 |
| 8 | APPLE | 468 | 700 | 232 | 8.23 |
| 9 | ASH | 461 | 551 | 90 | 8.10 |
| 10 | NUT | 459 | 664 | 205 | 8.07 |
| 11 | ELM | 459 | 594 | 135 | 8.07 |
| 12 | CLONES | 447 | 679 | 232 | 7.67 |
| 13 | BIRCH | 440 | 595 | 155 | 7.92 |
| 14 | CHERRY | 400 | 630 | 230 | 7.03 |
| 15 | LARCH | 396 | 585 | 189 | 7.30 |
| 16 | CHERRY | 370 | 585 | 215 | 6.35 |
| 17 | CHESTNUT | 367 | 630 | 263 | 6.30 |
| 18 | Douglas fir | 367 | 490 | 127 | 6.61 |
| 19 | PINE | 353 | 574 | 221 | 6.50 |
| 20 | ASAP | 324 | 567 | 243 | 5.70 |
| 21 | SPRUCE | 310 | 560 | 250 | 5.84 |
| 22 | POPLAR | 309 | 525 | 216 | 5.30 |
| 23 | FIR | 300 | 595 | 295 | 5.53 |
| 24 | WILLOW | 238 | 610 | 372 | 4.01 |
explanation to the table:
– mpu to metr przestrzenny drewna ułożonego (fireplace),
– water 25% to 25% wood moisture,
– fresh wood to drewno niesezonowane, bezpośrednio po ścięciu,
– evaporated water to ilość wody jaką trzeba odparować z drewna świeżego, do optymalnego poziomu 25% humidity 1 wood (need to put approx 10% wood shrinkage, a więc o te 10% więcej drewna trzeba wysuszyć i z niej też odparować wodę)
– Calorific Value to calorific value 1 mpu,
