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Fig. 10.8: Compressor station with screw-type compressor,
cooling compressed air dryer, compressed air receiver | A screw-type compressor, model S 21, is to be operated together with a cold compressed air dryer D27 in a small installation room. Structural considerations do not allow natural ventilation. Artificial ventilation with a ventilator is therefore required.
BOGE screw-type compressor, model S21
Output  : 2,42 m³/min
Motor rating : 15 kW
Cooling-air req.  V1 : 4900 m³/h (see page 10.10)
Cold compressed air dryer, model D27
Through-flow rate V■ : 2,66 m³/min
Cooling air req.  V2 : 770 m³/min (see data sheet)
The two flows of cooling air must be added together. The result is the required ventilator output that must be provided in the installation room.
Ventilator output  Vges : 5670 m³/h
The required size of air inlet aperture is calculated using ventilator output  Vttl and the maximum flow speed vS=3m/s :
Ain = minimum area of air inlet aperture [m³]
 Vttl = Ventilator output [m³/h]
vS = maximum flow speed [m/s]
A ventilator with an output of 5670 m³/hr must be installed in the installation room ( The dynamic pressure of the apertures must be taken into account when choosing the ventilator ). The air inlet aperture A in should be at least 0.525 m² in size.
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