Volvo Penta KAMD300, Installation Manual

Page: 109 / 140

Engine room, ventilation and sound proofing
107
Calculation of air ducts
Example 1.
Two diesel engines, 210 kW (280 hp)
Calculation of areas for two engines at 210 kW with a
non-restricted air supply and an ambient air tempera-
ture of +30°C (+86°F).
For each engine the following is obtained:
Area, engine’s air consumption:
1.1.9 × 210 = 400 cm² (62 sq.in). Also see fig. 1.
No corrections according to tables 1 and 2.
According to figs 1 and 2 on the following page, ex
1, this corresponds to a duct with a diameter of
225 mm (8.9") for a single engine.
Air ventilation, engine room:
1. Inlet, engine room: Area = 1.65 × 210 = 347 cm²
(54 sq.in). According to fig. 2, this gives a diame-
ter of 210 mm (8.3") for a single engine.
2. Outlet, engine room: Area = 1.65 × 210 = 347
cm² (54 sq.in). According to fig. 2, this gives a di-
ameter of 210 mm (8.3") for a single engine.
3. Extraction fan capacity: 0.07 × 210 (kW) =
14.7 m³/min (519 ft³/min).
4. NOTE! As this is a twin installtion figures have to
be doubled
Example 2.
A diesel engine, 96 kW (129 hp)
Calculation of areas for one engine with 2 m (6.6 ft)
duct length, 2 bends and an ambient air temperature
of +20°C (+68°F).
Area, engine’s air consumption:
1. 1.9 × 96 = 182 cm² (28 sq.in). Also see fig. 1.
Correction for air temperature = 0.7 from Table 2,
and correction for duct length and bends = 1.41
from Table 1.
This gives 182 × 0.7 × 1.41 = 180 cm² (28 sq.in).
According to Fig. 2, this gives a duct dia of
152 mm (6").
Air ventilation, engine room:
1. Inlet, engine room: Area = 1.65 × 96 = 158 cm²
(25 sq.in). According to Fig. 2, this gives a duct di-
ameter of 142 mm (5.6").
2. Outlet, engine room: Area = 1.65 × 96 = 158 cm²
(25 sq.in). According to Fig. 2, this gives a duct di-
ameter of 142 mm (5.6").
3. Correction, inlet and outlet: Air temperature =
0.7 from Table 2, and correction for duct length
and bends = 1.41 from Table 1.
This gives 158 × 0.7 × 1.41 = 156 cm² (24 sq.in).
According to fig. 2 this gives a duct dia of
141 mm (5.55") for each inlet and outlet.
4. Extraction fan capacity: 0.07 × 96 (kW) =
6.72 m³/min (237 ft³/min).