1.4 Air Compressor
55
[ 1 ] Calculating air volume required for weaving machines
Q = Qo
×
(1 + Kz)
×
No (Nm
3
/H)
....... ①
Where
Q:
Total air volume required (Nm
3
/H) (*1)
Qo:
Air consumption per weaving machine (Nm
3
/H)
Kz:
Piping loss rate (0.2, taking into account air leakage from pipes)
No:
Number of weaving machines
•
The required air quantity marked with (*1) varies depending upon the reed space, machine
speed, and weft number count. If you inform TOYODA of your fabric style and machine speed,
we will furnish you with the air volume right for you.
•
The above air volume and air consumption should be measured at 20°C under 0.10 MPa
(1.03 kgf/cm
2
).
[ 2 ] Calculating the capacity and the number of air compressors required
a =
..................... ②
Where
a:
Compressor load factor
This should be 0.85 or less for reciprocating compressors and 0.90 or less for
screw or turbo compressors.
Q:
Total air volume required (Nm
3
/H)
Qc:
Air discharge volume per compressor (Nm
3
/H) (*2)
Nc:
Number of compressors required
According to formulas
①
and
②
,
•
For the air discharge volume per compressor marked with (*2), refer to the compressor manufac-
turers’ catalogues. The major compressors are given on page 57.
•
It is recommended that a spare compressor be prepared in order to prevent your production from
becoming interrupted at the time of compressor breakdown or periodical maintenance.
•
For controlling the compressor capacity, be sure to choose an automatic unloader type.
(1) For reciprocating compressors
0.85
×
Qc
×
Nc
≥
Q
Then, Qc
×
Nc
≥
or Qc
×
Nc
≥
1.412
×
Qo
×
No
(2) For screw or turbo compressors
0.90
×
Qc
×
Nc
≥
Q
Then, Qc
×
Nc
≥
or Qc
×
Nc
≥
1.333
×
Qo
×
No
Q
Qc
×
Nc
Q
0.85
Q
0.9
