The Chemical Thermodynamic Module Of The Expert System For Thermodynamics ("Test") Web Application

Subrata Bhattacharjee, Christopher Paolini
2009 Annual Conference & Exposition Proceedings   unpublished
Hosted from www.thermofluids.net, the TEST web portal is a freely accessible thermodynamics web-based software package for engineering education. It combines several modules -multimedia problems and examples, an online solution manual for educators, traditional thermodynamic charts and tables, fifteen chapters of animations to illustrate thermodynamic systems and fundamental concepts, and a suite of thermodynamic calculators called daemons for solving thermodynamic problems and pursuing what-if
more » ... nd pursuing what-if scenarios. Designed as 'browsable' Java applets, these daemons cover a wide range of topics -property evaluation of working substances, energy, entropy, and exergy analysis of generic open and closed systems, IC engines, gas and vapor power cycles, refrigeration, HVAC, combustion, chemical equilibrium, and gas dynamics. In this paper, the chemistry module comprising of combustion and equilibrium analysis daemons for both open steady systems and unsteady processes is presented. The range of problems for which the combustion daemons can be used include balancing chemical reactions, evaluation of properties of reactants and products mixtures, energy and entropy analysis of premixed and nonpremixed reactants, and calculation of adiabatic flame temperature for complete reaction. The equilibrium daemons build upon the combustion daemon, use very similar applet interface, and yet employ the powerful Gibbs function minimization algorithm to handle tens of species in the equilibrium products mixture. These simple-to-use daemons, comparable in their accuracy to established codes such as NASA CEA 1 and STANJAN 2 , are used to determine equilibrium constant, equilibrium composition, and equilibrium temperature of methane combustion as a function of equivalent ratio. This paper demonstrates how simple it is to calculate the equilibrium temperature and then pursue what-if studies by varying the fuel air ratio, fuel composition, or the number of species in the products mixture. Once a solution is achieved, what-if studies can be performed by changing the fuel, selecting different products species, varying the air fuel ratio, or any controllable property by simply changing the parameter and then pressing a single update button.
doi:10.18260/1-2--5853 fatcat:n5ouoyfu55as3kukuan44bmcce