A 100 foot square machine shop is supplied by a 100 PSIA service
air system. The 2 inch supply header runs around the perimeter
of the room. The header has 28 service connections equally spaced
around the room. Each connection is required to supply 220 SCFM
to the attached device.
service air system usually supplies up to 5 loads at any given
time. The minimum required supply pressure at the load connection
is 80 PSIA. Will the system as-built meet these constraints?
In addition, during certain operations, an additional 3 loads
are added. How much must the inlet pressure be increased to
maintain the required supply pressure of 80 PSIA to each of
the 8 loads?
The network layout is once again built first, but the hardware
is left blank. Hardware is then added to one of each type of
branch (header and load). These two branches are then saved
(as branches), and the hardware loaded into each of the remaining
the first question the fluid is specified as air at 70 degrees
Fahrenheit and 100 PSIA. All the connection lines are shut except
for the 5 that are the farthest from the inlet. At these 6 open
lines an outlet flowrate of 220 SCFM is specified. DesigNet
will then solve for the outlet pressure of each line. By displaying
pressures it can be determined if the require criteria are met.
the second question, three additional valves are opened, and
in these lines an outlet flow of 220 SCFM is again specified.
The inlet pressure of the air is then varied and the solution
obtained until a pressure is specified which achieves the desired
80 PSIA at each load.