Welcome to the The Expert System for Thermodynamics (TEST) : CHClF2
module of the thermodynamic property tables (calculators) to evaluate states and properties of hundreds of working substances. TEST is a network
of HTML pages with embedded Java Applets that helps users solve thermodynamic
problems and perform parametric studies visually without any programming.
The Smart Thermodynamic Table is more than a visual
thermodynamic state calculator for CHClF2. In this refrigerant (CHClF2) property table,
a state is visually presented (see the examples below) as a collection
of properties (such as p, T, v, h, s etc.). Known properties are entered
in any order and in any units (see Fig. 3) and a click on the Calculate button evaluates the states partially or fully (including phase composition)
if sufficient information is entered. The calculated states are auto-saved
and can be plotted on a p-V,
T-s or
other thermodynamic diagrams by choosing a plot-type from the diagram selector
(see Fig. 2). The solution can be saved or shared through TEST-codes, which are generated when the Super-Calculate button is pressed.
While evaluating two related states (say, two
isentropic states), algebraic expressions involving state variables can
be used. For instance, to evaluate State-2,
isentropic to State-1,
one can enter s2 as =s1.
Once a series of states are evaluated, updating all calculations for a
change in any input variable is a snap. Simply change the value and click
on the Super-Calculate
(see Fig. 4) button. In addition to update all calculations, a printer-friendly
output is generated on the Output window of the daemon (see Fig. 2).
Because all the State variables are exposed,
changing one or more input variables and evaluating their effects is really
a matter of two clicks (Calculate and Super-Calculate)
, making TEST an exciting visual design tool for the what-if
people. The working fluid as well as the material model (ideal gas vs. phase-change model, for instance) used can be changed without much effort.
A more comprehensive introduction can be found
in the Tutorial page which is highly recommended for all users.
The examples below contain images of the CHClF2 table in action. Once you get a rough idea about how the smart table
works, you can start using the real thing by following these instructions.
There are two ways of doing anything,
the quick way and the right way.
If you are in a hurry, do the following: (a) Browse
the examples below (takes only a minute), and (b) Launch the customized
Java applet (called a daemon) by clicking the appropriate link at the top
of this page (beginning TEST 7.5, registration is required for all users). If you have a modern browser (Netscape 6.1 or better, Microsoft
IE 6.0 or better), the daemon will appear in about 10-50 seconds (1-5 second
if locally installed from a TEST-CD). (c) Begin exploring (a tour of the Tutorial/Slide Show is strongly recommended even for those who hate manuals).
To fully exploit TEST follow these steps: (a)
Browse the Slide Show (at least the first 20-30 slides); (b) Read the Introduction and Navigation sections of the Tutorial. (c) Explore a few daemons
systematically as explained in the Tutorial. (d) Browse the Problems page to see what kind of problems these thermodynamic calculators can help you solve. (e) Browse the VT (Virtual Thermo) animations to see how thermodynamic systems work. (f) Once you master the
TEST approach (you will love it or hate it, no in between!), you can use the TEST-Map to quick-start a desired daemon.