Online Thermodynamics Property Evaluator
What is the evaluator?

A web base application used to calculate
thermodynamics property.
 It
o
o
o
can calculate 3 types of substance
Ideal Gas
Incompressible substance
Compressible substance
 The calculation algorithm is made in
JavaScript using an existing Matlab code
as a guide.
 The evaluated properties.
o Temperature
o Pressure
o Specific Volume
o Internal Energy
o Enthalpy
o Entropy
 The evaluator URL is at Prof. Somerton’s
ME201 class page.
Is it accurate ?
How to use it ?
Choose the substance group link in the
main page to go to the group page.
Choose the specific substance/gas from the list.
Click on the known properties radio button and
key in the values in the text box next to it.
Click on ‘Calculate Now’ button
Known
properties
Temperature/
Pressure
Entropy/
Pressure
Specific
Volume/
Temperature
Specific
Volume/
Pressure
Pressure/
Enthalpy
Temperature(K)
200
199.9924
200
199.992
199.9997
Pressure(kPa)
50
50
50.002
50
50
Internal
Energy(kJ/kg)
-67.8718
-67.8763
-67.8718
-67.8766
-67.872
Specific
Volume(m3/kg)
1.1479
1.1479
1.1479
1.1479
1.1479
Enthalpy(kJ/kg)
-95.9965
-96.0032
-95.9965
-96.0036
-95.9965
Entropy(kJ/kgK)
5.2003
5.2003
5.2003
5.2003
5.2003
Internal Test Result for Ideal Gas
 Result produced for different known properties have
very small differences.
The evaluator will display the
result
in the bottom boxes.
Graphical User Interface (GUI)
Temperature(K)
Pressure(kPa)
Internal
Energy(kJ/kg)
Specific
Volume(m3/kg)
Enthalpy(kJ/kg)
Entropy(kJ/kgK)
Web
Matlab
% error
200
50
200
50
0
0
-67.87
-67.87
0
1.1479
1.1479
0
-96
5.2003
-96
5.2003
0
0
Comparison Between Matlab and Online Evaluator
 Result produced by Matlab and Online evaluator are the same
with no error.
Name: Mohd Shuhaimi Mokhtar
Adviser: Dr. Craig Somerton
Date: August 2, 2007
Main Page GUI
Ideal Gas GUI