Kubota WG972 E3 - 6 Heat Rejection to Coolant

1-8
6. HEAT REJECTION TO COOLANT
Specific at net intermittent (SAE J1349)
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
WG752
Gasoline
Brake horse power
kW 11.3 13.8 15.6 16.7 17.1
HP 15.1 18.5 21 22.4 23
PS 15.3 18.8 21.3 22.7 23.3
Fuel consumption
g/kWh 325 315 323 343 347
g/HPh 243 235 241 256 259
g/PSh 239 231 238 252 255
lb/HPh 0.535 0.517 0.531 0.564 0.571
Heat rejection to
cooling water
MJ/h 28.85 32.90 37.03 42.32 45.91
kcal/h 6891 7859 8846 10110 10967
BTU/h 27735 31631 35604 40689 44141
LPG
Brake horse power
kW 10.7 13.1 14.9 16 16.4
HP 14.3 17.6 20 21.5 22
PS 14.5 17.9 20.3 21.8 22.3
Fuel consumption
g/kWh 301 296 306 322 337
g/HPh 224 221 228 240 251
g/PSh 221 218 225 237 248
lb/HPh 0.495 0.487 0.502 0.53 0.554
Heat rejection to
cooling water
MJ/h 28.02 32.51 37.12 42.16 47.37
kcal/h 6694 7766 8867 10072 11316
BTU/h 26944 31255 35688 40539 45543