AIR DUCT DESIGN PROGRAM FEATURES AUTOMATIC FITTING "C" FACTORS, EQUAL
FRICTION, CONSTANT VELOCITY, STATIC REGAIN SIZING

MC2 Engineering Software is offering a powerful upgrade of its long-popular
DD4M air duct design program for microcomputers. The software offers
features not usually found on microcomputer engineering programs,
including the latest in input screens with pop-up windows, cursor control,
use of arrows, function keys and "escape" from any position in the
program. All inputs are fully error-checked by the program, with error
messages and full recovery from almost any situation. Prompts are clear
and logical and "help" messages are available from any cursor position.
The 80 help messages, which vary from a sentence to several screen pages,
give most of the information in the program manual, making reference to it
almost unnecessary. The program automatically sets itself up for color or
monochrome monitors.

The new program follows the methods of the 1985 ASHRAE Handbook of
Fundamentals. The calculation of fittings is greatly facilitated, since
the program automatically calls up the necessary data for all 100-plus
"standard" fittings listed in ASHRAE Fundamentals (and in SMACNA 15D) and
prompts for such special inputs as bend angle, outlet area or branch flow
that may be required to automatically calculate the "C-factor" for each.
DD4M faithfully calculates C-factors, interpolating the C-factor tables of
the ASHRAE Fundamentals handbook. The program is "smart" enough to reject
many fitting misapplications and erroneous inputs. Up to six fittings are
allowed in each duct section.

Fittings may be input with or without screens, perforated plates or
orifices. Obstructions and depressions in duct sections may also be
entered. Butterfly, gate, airfoil blade and parallel blade dampers are
accepted and settings may be adjusted so as to approximately balance the
system during the design stage. Fittings with extractors, splitter vanes,
branch dampers and other devices are accepted. In addition to the ASHRAE
and SMACNA fittings for which entries are automated, the program accepts
unlimited entry of other devices and fittings by equivalent feet, direct
drop or "C-factors".

The program calculates the pressure drop of each section and its fittings
in "real time" as it is entered, and automatically sizes the regain
methods, individually or mixed. The program's recommendation may be
overridden, of course, making the program useful for retrofit analysis as
well as new work.

The program reports the progressive changes in duct total pressure,
velocity, friction rate and other important information. Separate
calculations are automatically made for the continuing main duct and
branches in the case of wyes and tees. The key design parameters (friction
rate, velocity or pressure drop per section) may be changed during the
design, if the user wishes.

This powerful program calculates round, rectangular, oval or flexible duct
and accepts roughness factors. Calculations are altitude-, temperature-
and humidity-corrected. Factors which occasionally change during system
design such as duct shape, roughness or the designer's desired friction
rate, may be altered at any time by the use of function keys which pop-up
windows for these purposes. The user may enter standards for
seldom-changed factors to avoid frequent reentry.

Function keys are used to call up help messages and call up windows to
display lists and detailed descriptions of "standard" fittings. Job files
are kept on disk with all inputs and outputs. Inputs and outputs in the
job file are readable by many CAD programs, Lotus and similar spreadsheet
and graphics programs so that the user may use the outputs within his CAD
program or develop graphs and charts as he wishes.

This advanced program uses fast, compiled code and assembly language
routines to provide almost instantaneous screen functions and calculations
in "real time" as inputs are made. Screens are clear and highly
interactive, permitting immediate change of incorrect entries, and quick
communication between various parts of the program.

DD4M is suitable for air conditioning and heating use, for commercial and
industrial ventilation jobs, for dust or fume removal systems, and for
material handling applications. There are no program limits on air
velocity in the system.

This version of DD4M calculates exhaust as well as air distribution
systems, a feature not found in many duct design programs. The program
accepts up to 1000 duct sections if a hard disk is used, arranged in up to
200 paths.

DD4M displays or prints a complete duct section-by-section tabular print
out of the job showing pressure drops and absolute pressures and permits
change and immediate recalculation to eliminate unusual sizes and to
arrive at a better balance for the system. Dampers in the system may be
"adjusted" within the program so as to explore system balancing
possibilities during the design stage. The program prints a schedule of
fittings and duct pieces required by the job, sorted by size, for costing
and fabrication purposes.

The DD4M program is complete with a manual and example problems which are
described in the manual and supplied as job files on the distribution
diskette for demonstration purposes. DD4M is available for all IBM and
compatible microcomputer models, in 5- 1/4 or 3-1/2 inch disk MSDOS disk
formats. A minimum of 480K RAM, two floppy disks, and a dot matrix or
daisy wheel printer are needed for operation of the DD4M. Hard disk
operation is supported. A utility is provided for automatic hard disk
installation. A demonstration disk is available to potential users.

Much effort has been expended throughout the DD4M program to make the
software as convenient, useful and error-proof as possible. It is
sufficiently easy for use by inexperienced designers, yet is powerful,
flexible and fast enough for the biggest and toughest commercial jobs.

MC2 has specialized in the development of engineering software for
microcomputers since 1977, and has long been the leader in this field.
More than 25 programs are now offered for most engineering disciplines,
including mechanical engineering, energy management, hydraulic,
structural, solar energy, fire sprinkler design and electrical
engineering. The Miami firm has more than 7000 users of its programs, in
over 65 countries around the world.

MC2 Engineering Software may be reached at telephone number 305-665-0100,
fax number 305-665-8035, or by mail at 8107 SW 72 Ave. #425E, Miami, FL
33143.

MC2 Engineering Software's Internet address is MC2EngSoft@AOL.com and may
be reached on America OnLine at MC2EngSoft and on CompuServe at
MC2EngSoft@CompuServe.com. Functional demonstration disks of MC2 software
may be downloaded through AOL by selecting "Go To" then "Search Software
Libraries" then type in "MC2 Engineering."
 
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