Libris Britannia 4/science library(b).zip/science library(b)/ENGINEER/3712.ZIP/DUCTD.EXE/DUCTDEMO.DOC

Text File | 1992-01-21 | 8KB | 251 lines

DUCTING SYSTEM EVALUATOR - Notes on Demo Version - current 7 2 1992
*******************************************************************

The demo version of this program is a working copy capable of handling
systems incorporating up to 20 duct sections. The full working version allows
systems to be configured with up to 200 sections.

The facility to produce hard copy of results is absent in the demonstration
version. All generated data can be printed out from the full version.

RUNNING THE DEMO PROGRAM
With the demonstration diskette in drive A: type 'DUCTDEMO' to run the
demonstration program.

The program 'DUCTDEMO.EXE' can be copied to, and run from, hard disk if
required; there are no supporting files.


PROJECT REFERENCES
Any text can be entered in the 'Project References' box; it can be left empty
by using the <return> or arrow keys to exit the lines. The date will be
entered automatically, but it can be edited subsequently.

CONFIGURATION ENTRY
Select 'ENTER CONFIG' to manually enter a new configuration.

'LOAD CONFIG FILE' allows a previously saved system configuration to be
loaded.

ENTERING A NEW CONFIGURATION
The section references are generated by the program. The notation is of the
form ' 0 - 1 ' where 0 refers to the upstream end of the section and 1 to the
downstream end. Section 0 - 1 is always the first section in the system, with
the '0' point being the exit from the air handling unit.

In response to the 'BRANCHES' prompt, enter the number of sections into
which the duct divides; a maximum of five branches is allowed. Entering '0'
tells the program that the section terminates in an outlet (or inlet in the
case of extract systems).

We have allowed the special case of 1 branch - meaning that there is an outlet
directly on the downstream end of the duct section, with ducting continuing
beyond it. Please note that it is possible to enter the inlet/outlet volume as
zero; - this can be a useful way of configuring a change of duct section at
a particular point in the system.

Each complete line of data relating to a section is entered in the
Configuration Record table. Hitting the <Esc> key when on the empty
'BRANCHES' field will bring back the line previously entered for correction or
alteration. It is possible to step back as far as section 0 - 1 in this way if
necessary.

Within the data entry line, the left arrow key can be used to move back to a
previous field.





To speed entry, for all sections after 0 - 1 it is possible to just hit
<Return> when on the 'R/C' (Rectangular/Circular) field; the setting will
default to that in the previous line.

Configuration entry terminates automatically when all branches have been
entered. A menu appears showing the options available at that stage.


LOADING A CONFIGURATION FILE
Previously saved configurations can be recalled using this option.

Some example configuration files are included on the demonstration disk. These
are called 'DEMO1', 'DEMO2', and 'DEMO3' respectively.

Diagramattic representations of these three demo configurations are available.

DESIGN DATA
This is a three line table which requests basic data upon which subsequent
calculations will be based.

Help can be invoked at this stage, and at other stages of the program where
data input is being requested, by hitting the <F1> key. This key also removes
the help window. In most cases the help window is automatically deactivated
upon further input of data.

The program will reject unsuitable or out of range data.


INTERACTIVE CALCULATION TABLE
Selecting the 'CALCULATE' menu option displays an complete initial set of duct
sizes for the system configured. 'Standard' CIBS sizes are used. Sections
which you specified as rectangular will show a width and height while a
diameter is given for circular sections.

Note that arrows appear against sections which form the index run.

No fittings have yet been entered. With the 'Fittings' field highlighted,
hitting any alphanumeric key causes a Fittings table for the section being
considered to appear.

With the 'Type' field highlighted, hitting any alphanumeric key brings up a
menu of fittings; - select the appropriate one and hit <return> to enter it in
the table. Exit the Fittings table either from the fittings menu, or by hitting
<return> on the first empty 'Type' field.

Note that hitting <delete> or <backspace> on the highlighted 'Type' field of an
existing line of fittings data will delete that line from the table.

Once the takeoff method applying to any one duct section has been
configured, the fittings menu options relating to takeoffs will be inhibited
thereafter, unless the takeoff line is deleted from the fittings table.
Similarly, only one inlet/outlet can appear in the table. It is however up to
the user to ensure that branches and main duct continuations are correctly
identified; -there is no check against for example, describing two or more
branches from a particular node as 'Main Duct Continuations'.


If necessary, section heights/widths and diameters can now be changed. Again
the table updates as this done. If you wish to change a circular section to
rectangular, it is only necessary to enter a height and width. The diameter
figure will be deleted. The same applies to entering a diameter for a section
currently rectangular. Note that if only a width or a height is entered on a
section having a diameter showing, it will cancel when the line is left, and
the section will remain as circular.

The range of fittings presented by the fittings menu is different for
rectangular and circular ducts. Therefore, when changing sections
incorporating fittings from rectangular to circular or vice versa, changes are
automatically made to the table to convert fittings to the most appropriate
type.

Outlet/inlet volumes can be edited - these appear in white. If you have used
the method of describing a section as having one branch to denote an outlet
directly on the section, the volume entered for that section will be
unavailable for editing since there will be other airflows making up the total
for that section.

The total volume, overall pressure drop, and index run calculations are
automatically updated after entry of new data into any field.

Hit the <Esc> key to leave the table.

Please note that if you select the 'DESIGN DATA' menu option, subsequent
return to the calculation stage will reset all ducts to standard sizes.


HEATGAINS
This option calculates heat losses and gains to your duct system. Total surface
area is also shown. Gains/losses are calculated on a node by node basis - the
air temperature existing at each section is computed and the program shows:-
i) in the case of a supply system the worst outlet i.e. lowest/highest supply
air temperature for loss/gain situations;
ii) in the case of an extract system the air temperature returning to the air
treatment plant;


OTHER MENU OPTIONS

SAVE -  Allows you to save a particular configuration to a file. Your Design
Data and any thermal data i.e. Insulation U value etc. are also saved together
with all details you have supplied relating to fittings.

You will be asked for a filename; - DOS naming conventions apply. The
program supplies the extension '.DSE' automatically.

If you supply the name of an existing file, this will be overwritten without
any further confirmation being requested.

PRINT - Full printout of results is inhibited in the demo version, although
some text will be printed if these options are selected.



VIEW CONFIG - Permits the configuration table to be viewed.

EDIT CONFIG - Brings the last section entered back onto the input line for
revision. Hitting <Esc> steps back through the table.

CLEAR - Clears the current project; - data is NOT automatically saved, but
you are reminded to do so.

QUIT - Terminates the program.


*****************************************************************************