Kubota DG972 E2, Applications Manual, Page: 55 / 93

1-9
NOTE
• Heat rejection to cooling water calculating formula
• Ho=Hu·Ne·be·i
Ho : Heat rejection to cooling water
Hu : Fuel lower heating value
Gasoline : 42.7 MJ/kg, 10201 kcal/kg, 18361 BTU/lb
LPG : 47.3 MJ/kg, 11300 kcal/kg, 20339 BTU/lb
NG : 49.5 MJ/kg, 11828 kcal/kg, 21285 BTU/lb
Japanese standard gas
lower heating value : 9699 kcal/m
3
(1090 BTU/ft
3
)
supply pressure : 0.98 − 2.45 kPa (2.27 − 5.68 oz/inch
2
)
Ne : Brake horse power
be : Specific fuel consumption ratio
i : Dispersion ratio to cooling water
Model Fuel Output
Engine Speed (min
-1
(rpm))
2000 2400 2800 3200 3600
WG972
Gasoline
Brake horse power
kW 14.8 17.8 20.6 22.2 23.1
HP 19.8 23.9 27.6 29.8 31.0
PS 20.1 24.2 28.0 30.2 31.4
Fuel consumption
g/kWh 404 398 371 351 334
g/HPh 301 297 276 262 249
g/PSh 297 292 272 258 245
lb/HPh 0.664 0.654 0.609 0.577 0.549
Heat rejection to
cooling water
MJ/h 44.37 47.51 54.81 58.90 64.88
kcal/h 10599 11349 13094 14072 15501
BTU/h 42058 45035 51957 55840 61509
LPG
Brake horse power
kW 14.7 17.8 20.1 21.2 22.0
HP 19.8 23.8 26.9 28.5 29.5
PS 20.1 24.1 27.3 28.9 29.9
Fuel consumption
g/kWh 301 287 286 292 299
g/HPh 224 214 213 218 223
g/PSh 221 211 210 215 220
lb/HPh 0.494 0.471 0.470 0.480 0.491
Heat rejection to
cooling water
MJ/h 36.49 37.80 45.63 51.87 61.28
kcal/h 8717 9031 10900 12391 14640
BTU/h 34589 35837 43252 49167 58094
DG972 NG
Brake horse power
kW 10.0 13.9 16.1 17.4 17.6
HP 13.4 18.6 21.6 23.3 23.6
PS 13.6 18.9 21.9 23.7 23.9
Fuel consumption
g/kWh 380 310 298 293 285
g/HPh 283 231 222 219 213
g/PSh 279 228 219 216 210
lb/HPh 0.624 0.509 0.489 0.483 0.47
Heat rejection to
cooling water
MJ/h 32.73 33.49 39.90 44.67 48.91
kcal/h 7805 7979 9529 10683 11713
BTU/h 30968 31638 37770 42398 46510