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Fig. 10.9: Circulation of cooling-air in a BOGE screw-type
compressor from series S21 - S 150 | The circulation of cooling air through inlet and outlet ducts is an elegant solution to thermal problems in a compressor installation room.
Duct ventilation is possible with sound-insulated compressors. The cool air is directed over the compressor and kept together for extraction. BOGE screw-type compressors are fitted with a cooling ventilator that generates a surface pressure of approx. 60 P a (approx. 6 mm WH). This means that it can force exhaust air through a straight outlet duct of approx. 5 m in length and with the recommended cross-section.
The ducts can be connected to the apertures in the sound insulation hood without difficulty. There is normally no need for an additional exhaust ventilator inside the duct.
The cool-air ducts direct the air out into the open. But they can also be fitted with flap controls to use the heated air for room heating in Winter. If the compressor rooms are unheated, it may be desirable in Winter to use an air circulation system with part of the heated cooling air being released into the compressor room. |