Volvo IPS950 - Page 28

Calculation of air ducts
Example 1: IPS650, 375kW (510 hp)
Calculation of areas for one 375kW engine with an
unlimited
airflow and an outside temperature of +30 °C
(+86°F).
Air consumption:
The following is obtained for each engine:
Area for engine air consumption: 1.9 × 375 = 713
cm
2
(110.5 sq.in)
No corrections according to the Coefficient of bends
and Correction factor tables The area 713 cm² (110.5
sq.in) gives a duct diameter of 267 mm (10.5") for each
engine (2√(area/π).
Multiply by the number of engines to calculate the area
of the engine compartment inlet duct.
Ventilation:
1
Air intake: Area = 1.65 × 375 = 619 cm
2
(95.4
sq.in). This gives a diameter of 304 mm (12.0") for
a single engine.
2
Air outlet: Area = 1.65 × 375 = 619 cm
2
(95.4
sq.in). This gives a diameter of 304 mm (12.0") for
a single engine.
3 Extraction fan capacities: 0.07 × 375 = 26.2
m
3
/min (1091 ft
3
/min).
4 Multiply each sum by the number of engines to cal-
culate the area and fan capacity for a common
engine compartment.
Arrangement and Planning, Engine Room
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