Page 19 - FANS. Aerodynamic _Selection Meethod__Combine_part2

Note 1:

In the software selection (selection) of the fan, it is advisable to enter the
sequence:

a) on logarithmic characteristics (including the summary ones) of fans,
determine the number and type of the fan.

b) go to the linear characteristic of the selected fan, and, if necessary, adjust
the resistance of the ventilation network in order to establish the final
parameters. Fan picked up! These actions are related to the fact that it is

impossible to graphically determine the transitions of the calculated point
only from the logarithmic characteristic of the fan (from vol.10 to 11 and
from vol.10 * to 11.11). Although using the properties of logarithms and this
problem can be solved for the software selection (selection) of the fan.

Note 2:

1. Obtaining the final performance parameter L = 2000 m³ / h is

mandatory.
2. The final parameter of the total pressure will differ from the
originally designed (P = 500 Pa) by 80 Pa and be 580 Pa.
3. The final parameter of the total pressure for the selected type (types),
number (s), number of revolutions (number of revolutions) of the fan
(s) is only confirming the performance and is always different from
the calculated (design) point (v.9).