PRODUCT INFORMATION
INDEX
DATE
Dep. 2
IT-G-A-00-008e A
February 2010
EMISSIONS - RELATED INSTALLATION INSTRUCTIONS
4/5
4. ENGINE-ROOM VENTILATION
The correct ventilation of the engine room allows the correct engine performance; especially in the case the
engine takes the air from the room.
In designing a ventilation system, the same importance should be given to the necessary volume of air as to the
flow direction.
The ventilation system must be able to provide sufficient combustion air and to remove radiation heat from the
rest of the facility.
For an estimated thermal difference of 5ºC (9ºF) between inlet and outlet air temperatures, the air inflow must
be in the region of 70 m
3
/h per 1kW installed power. See the following table for air flow rates.
ENGINE TYPE
EXHAUST MANIFOLD
AIR FLOW RATE
AIR INTAKE ENGINE
ENGINE ROOM
VENTILATION
TOTAL
ft
3
/hHP m
3
/hkW ft
3
/hHP m
3
/hkW ft
3
/hHP m
3
/hkW
TURBOCHARGED
WATER-
COOLED
EXTERNAL FILTER
0
0
1580
60
1580
60
INTERNAL FILTER
263
10
1580
60
1843
70
DRY
EXTERNAL FILTER
0
0
1580
60
1580
60
INTERNAL FILTER
263
10
1580
60
1843
70
Generally, the air flow direction in an engine room will match the following pattern:
-
The entry of air in the engine room should be from the area furthest away from any sources of heat.
-
The fresh air should be able to flow freely from the point of entry to the sources of heat, in its circulation
towards the point of exit.
-
The expulsion of hot air should be at a point directly above the most important sources of heat, avoiding the
intake of the exhaust gas.
-
Where the temperature of the engine room or, in particular, of the crankcase gases return lines to the
intake manifold is too low, the said lines must be heat-insulated so as to prevent condensation in the said
piping section.
In all cases, the hot air should be forced out of the engine room by means of an outlet duct, without allowing it to
mix with the fresh ventilation air.
5.2 INSTALLATION OF AIR FILTERS
-
The filters should be installed in every case in the most optimum place according to the layout of the engine
room.
-
A sufficient quantity of combustion air should be guaranteed.
-
In case of an external air inlet, avoid any risk of water entering into the filter.
-
The minimum cross section area (S) of air flow through the filter protector derives from the following equation:
S = S1 x 2
(where S1 = developed area of the filter)
-
The air duct between the filter and the engine should be made of metal with a circular or rectangular section.
-
The maximum admissible pressure drop after filter, measured in the air intake duct, should not be bigger
than 381 mm.w.c. relative to external atmosphere. It is recommended to keep approximately 81 mm.w.c. in
reserve, that is to say that with clean filter the maximum pressure drop shouldn’t exceed 300 mm.w.c.
4.1.56
O&M_2.002211.810_A_10_2016
