Kubota WG972 E3 - 4 Air Requirements; Combustion Air Requirements (at 25 Deg.C and 1000 Hpa)

1-4
4. AIR REQUIREMENTS
[1] Combustion air requirements (At 25 deg.C and 1000 hPa)
NOTE
• Combustion air requirements calculating formula
•Q1=Vh·N·C·η·10
-3
– Q1 : Amount of intake air (m
3
/min)
– Vh : Total displacement (L)
– N : Engine speed (min
-1
(rpm))
– C : Coefficient=0.5
– η : Intake efficiency
Gasoline : 0.85
LPG : 0.81
Natural Gas: 0.77
Model Fuel Output
Engine Speed (min
-1
(rpm))
2000 2400 2800 3200 3600
WG752
Gasoline
Combustion air
requirements
L/sec 10.48 12.58 14.68 16.77 18.87
m
3
/h 37.74 45.29 52.84 60.38 67.93
in
3
/sec 640 768 896 1024 1152
ft
3
/min 22.21 26.65 31.09 35.54 39.98
LPG
Combustion air
requirements
L/sec 9.99 11.99 13.99 15.98 17.98
m
3
/h 35.96 43.16 50.35 57.54 64.74
in
3
/sec 610 732 853 975 1097
ft
3
/min 21.16 25.40 29.63 33.86 38.10
Model Fuel Output
Engine Speed (min
-1
(rpm))
2000 2400 2800 3200 3600
WG972
Gasoline
Combustion air
requirements
L/sec 13.63 16.35 19.08 21.81 24.53
m
3
/h 49.06 58.87 68.69 78.50 88.31
in
3
/sec 832 998 1164 1331 1497
ft
3
/min 28.87 34.65 40.42 46.20 51.97
LPG
Combustion air
requirements
L/sec 12.99 15.58 18.18 20.78 23.38
m
3
/h 46.75 56.10 65.45 74.81 84.16
in
3
/sec 793 951 1110 1268 1427
ft
3
/min 27.51 33.02 38.52 44.02 49.53
DG972 NG
Combustion air
requirements
L/sec 12.35 14.81 17.28 19.75 22.22
m
3
/h 44.44 53.33 62.22 71.11 80.00
in
3
/sec 753 904 1055 1205 1356
ft
3
/min 26.16 31.39 36.62 41.85 47.08