User manual

Industrial Air Division
2920 1163 04
34
The required ventilation to limit the compressor room
temperature can be calculated as follows:
For alternatives 1 and 3: Qv = 0.92 N/ ∆T
Qv = required ventilation capacity in m
3
/s
N = shaft input of compressor in kW
∆T = temperature increase in compressor room
For alternatives 2 and 4, the fan capacity should match the
compressor fan capacity at a pressure head equal to the
pressure drop caused by the cooling air outlet ducts.
5 Position of condensate drain flexibles. The flexibles
towards the drain collector must not dip into the water of the
drain collector. Atlas Copco has oil separators to separate
the major part of oil from condensate to ensure that the
condensate meets the requirements of the environmental
codes.
6 Position of compressor control module.
7 Position of mains cables entry. See section 7.2 for the
recommended electric cables. See section 7.4 for
connecting the power supply. Provide an isolating switch
near the compressor.
8 Provision for energy recovery system.
9 High-efficiency filter, type PD (optional). Filter traps solid
particles down to 0.01 micron with max. oil carry-over of
0.01 mg/m
3
. A PD filter must be installed downstream of a
DD filter (optional).
If oil vapour and odours are undesirable, a filter of the QD
type (optional) should be installed downstream of the PD
filter.
10 Position of safety valve.
11 Position of small grating (is not to be ducted away due to
heat dissipation below 1 kW).
12 Position of moisture trap in case the optional by-pass
system is installed.
13 Position of optional by-pass pipe.
- The air receiver (optional) should be installed in a frost-free
room and on a level concrete foundation.
For normal air consumption, the volume of the air net
(receiver and piping) can be calculated as follows:
0.25 x Qc x P1 x To
V =
____________________________
fmax x ∆P x T1
V = volume of air net in l
Qc = free air delivery of compressor in l/s
P1 = compressor air inlet pressure in bar absolute
fmax = cycle frequency = 1 cycle/30 s
∆ P = Punload - Pload in bar
T1 = compressor air inlet temperature in K
To = air receiver temperature in K