PRODUCT INFORMATION
INDEX
DATE
Dep. 2
IC-C-D-35-002e C
May 2016
GAS ENGINES INTAKE SYSTEM
3/4
1 Air
Filter
2 Air
Compressor
3 Air
Cooler
4 Valves
5 Piston
6 Combustion
Chamber
7 Exhaust
Turbine
8 Non Compressed Air
9 Hot Compressed Air
10 Intercooler Water Inlet
11 Intercooler Water Outlet
12 Cold
Compressed
Air
Fig. 3 - General Drawing - Intake System
The electronic management of the units with a control of the power generated (in kW) regulates and limits the
supercharging of the engine, normally being sufficient as a safety limiter.
5. AIR COOLER
The air cooler is integrated into the engine and consist of a tube nest and blades, housed in a reinforced cast-
iron body as a pressurised air-fuel mixture circulates between the tubes.
The air cooler is cooled by means of water from the auxiliary circuit (at 55ºC or 80ºC depending on the engine
model), which circulates inside the tubes. Two-stage coolers have main circuit water flowing at 82ºC through
their first stage.
Water reduces the temperature of the air-fuel mixture once compressed by the turbo. On reducing the
temperature of the air-fuel mixture the density of the air load in the engine increases, allowing a larger amount
of air-fuel mixture to enter the cylinder. This leads to greater combustion efficiency and indirectly, more power
per cylinder.
6. THROTTLE VALVE
The load regulation valve (Throttle valve) lies downstream of the air cooler outlet. By regulating the amount of
A/F mixture delivered to the cylinders, it regulates the power output or the speed according as the engine is in
grid or island mode.
This valve is driven directly by the load/speed regulator.
In “V” engines, a branch at the outlet of the Throttle valve diverts the flow of mixture toward the two intake
manifolds
1
9
8
3
2
5
6
4
7
2.6.3
O&M_2.002211.810_A_10_2016
