eta 13250, Installation Manual

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Fuel store Heating value
69
11.5 Heating value
Heating values of fuels
Heating val-
ue based
on weight
Cubic metre (rm)
a
Loose cubic metre (srm)
b
Logs Wood chips P16S Wood chips P31S
Weight
Heating val-
ue
Weight
Heating val-
ue
Weight
Heating val-
ue
Water con-
tent
15% 30% 15% 30% 15% 30% 15% 30% 15% 30% 15% 30% 15% 30%
Unit
kWh/
kg
kWh/
kg
kg/
rm
kg/
rm
kWh/
rm
kWh/
rm
kg/
srm
kg/
srm
kWh/
srm
kWh/
srm
kg/
srm
kg/
srm
kWh/
srm
kWh/
srm
Softwood
1 rm =
0.65 fm
c
1 rm =
0.56 fm
c
1 srm = 0.40 fm
c
1 rm = 0.33 fm
c
Fir 4.40 3.51 276 317 1210 1110 178 205 780 720 148 171 650 600
Spruce 4.49 3.58 293 337 1310 1210 189 218 850 780 157 181 710 650
Douglas fir 4.43 3.53 319 368 1410 1300 206 237 910 840 172 198 760 700
Pine 4.32 3.44 360 414 1550 1420 232 267 1000 920 193 223 830 770
Larch 4.27 3.39 370 426 1580 1450 239 275 1020 930 199 229 850 780
Hardwood
1 rm =
0.59 fm
c
1 rm =
0.50 fm
c
1 srm = 0.40 fm
c
1 rm = 0.33 fm
c
Poplar 3.99 3.16 256 295 1020 930 174 200 690 630 145 167 580 530
Willow 3.76 2.97 320 369 1200 1100 217 250 810 740 181 208 680 620
Alder 4.06 3.23 313 361 1270 1160 212 245 860 790 177 204 720 660
Maple 4.04 3.21 384 443 1550 1420 260 300 1050 960 217 250 880 800
Birch 4.01 3.18 391 450 1570 1430 265 305 1060 970 221 254 890 810
Ash 4.10 3.25 429 494 1760 1610 291 335 1190 1090 242 279 990 910
Oak 4.10 3.25 429 494 1760 1610 291 335 1190 1090 242 279 990 910
Beech 4.13 3.28 435 502 1800 1640 302 347 1220 1110 251 289 1010 930
Robinia 4.11 3.27 467 538 1920 1760 317 365 1300 1190 264 304 1090 990
a. A cubic metre (rm) corresponds to 1 m³ layered logs (1 m length) with air gaps.
b. A loose cubic metre (srm) corresponds to 1 m³ of loosely dumped wood chips.
c. A solid cubic metre (fm) corresponds to 1 m³ wood without air gaps.