Dec 052017
Calculate air flow in ducts.
File AIRFLOW.ZIP from The Programmer’s Corner in
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Calculate air flow in ducts.
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AFC.DOC 4869 2092 deflated
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EX1 193 157 deflated
EXAMPLE 855 304 deflated
FANDATA.TXT 1801 370 deflated
WHATSNEW.DOC 931 464 deflated

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Contents of the AFC.DOC file


Copyright (c) 1994
by J. W. Slusser
Snyder Creek Software

For your balancing act


The author makes no claims or warranties regarding the usefulness
or functionality of this program. It is provided "AS IS". You, the
user, accept full responsibility and liability for any problems or
damages associated with its operation.

Shareware Plug
A lot of time and effort has gone into this program. If you find it
useful please register it. The registration fee for this program is
$15.00. Send cash, check or money order drawn on "US" funds to:

James W. Slusser
RR2 Box 128
West Union, Il. 62477

Make sure your address is included on the check or M.O.. Registration
means you will be eligible for one (1) free upgrade.

The program was developed to aid engineers and technicians in
tracking the performance of fan systems.
A fan's performance is subject to certain physical laws which are
commonly referred to as fan laws. Performance of a fan at varying speeds
can be predicted through the use of these three basic fan laws.

1. The volume of air delivered by a fan varies in direct proportion
to its speed.
2. Static pressure varies as the square of the fan speed.
3. Power required to run the fan varies as the cube fan speed.

These laws are the basis of this program and the formulas used are
indicated in the program.

An IMPORTANT NOTE about adjusting fan speeds:

Before making any adjustments to the fan always check the
manufacturers recommended safe fan speeds and also the motor manufacturers
safe operating amps.

For this program to be useful to you some involvement in measuring
air flow would be required. Knowing how to use a monometer and a pitot tube
to measure velocity pressures in air streams would be helpful.

The air flow calculations are based on standard air density of .075
lbs. per cu. foot. Future versions will allow the user to enter air
temperatures and barometric pressures and calulate actual air densities.


Selection #1:

Allows you to enter your field collected data, duct type and size,
number of traverse points, and velocity pressure (VP), in inches of water
column, for each point. It then does the calculations for you to establish:

a. The square root of each VP measured.
b. Multiplies the square root of the VP by 4005 to
establish the velocity at each point (standard air
c. Calculates the average of all velocities.
d. Calculates duct area in square feet.
e. Multiplies the area times the average velocity to
establish the cubic feet of air per minute (CFM)
produced in any given duct.
f. Allows you to save the final results to a file for
future reference.

Selection #2:

Allows you to use the information you have in hand to calculate fan
speeds needed to produce the required CFM's. Once the data has been entered
and a required speed has been calculated you will be able to enter the next
stage of the program, selection #3.

Selection #3:

Allows you to size the fan pulley or motor sheave to produce the
desired CFM. When entering this area from inside the program, from selection
#2 area, the required speed is presented for you. When you enter this area
from the main menu you must enter the required speed. At any rate you have
two choices you can calculate the fan pulley or the motor sheave size, your

Selection #4:

Allows you to read existing files. It searches the current directory
and lists all the files that are available for reading. It then prompts you
for a filename. When you enter a valid file name it displays the file for

Selection #5:

Allows you to print existing files. Again this is like the read file
selection, it lists all available files in the AFC directory.
It will print any text file you ask for, including this one.

Selection #6:

Does just what it says, Quits.

AIR-FLOW-CALC was written and compiled with Borland's 'Turbo C++ 3.0.'
Copyright (c) 1992 by Borland International.
AFC.Exe was then compressed using PKLITE Professional Version 1.00
Copyright (c) 1990 PKWARE, Inc.

Your comments and suggestions are welcome anytime!

James W. Slusser
RR2 Box 128
West Union, Il. 62477

Snyder Creek BBS
(217) 826-8975
1200 - 14,400 bps 8-N-1
[email protected]

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