Engineering Equation Solver

EES (pronounced 'ease') is an acronym for Engineering Equation Solver. The basic function provided by EES is the solution of a set of algebraic equations. EES can efficiently solve thousands of coupled non-linear algebraic equations. EES can also be used to solve initial value differential equations. EES provides publication-quality plots, linear and non-linear regression, optimization, unit conversion and consistency checking, and uncertainty analyses. Built-in functions are provided for thermodynamic and transport properties of many substances, including steam, air, refrigerants, cryogenic fluids, JANAF table gases, hydrocarbons and psychrometrics. Additional property data can be added. EES also allows user-written functions, procedures, modules, and tabular data.


Downloading the Windows 7/8/10/Vista/XP version

EES is designed for the Microsoft Windows operating system. It can be accessed from computers on the CAE laboratory machines or from XENAPP. The XENAPP application makes it possible to run EES on a Macinstosh computer. See CAE documentation. for details.

Students and faculty at the University of Wisconsin may also copy EES for use on their Windows-based personal computers. However, this Academic EES will only work if the computer is connected to the internet using an IP address that maps to University of Wisconsin - Madison. You may be able to use EES off-campus by installing WiscVPN on your computer. Download the setup_ees_acad.exe and EES.dft files. Execute setup_ees.exe and follow the instructions. Then copy the EES.dft file into the folder that EES you installed EES in. After EES is successfully installed, you may delete the setup_ees.exe file as it is no longer needed.

The EES manual is named ees_manual.pdf. Click on the link to view or copy it. If you put a copy of the manual in the EES directory, you can access it from the EES Mannual command in the Help menu.

Further Information  

Link to a YouTube channel that provides short tutorials on specific EES topics  

Download the a webinar that provided instructions for accessing property information in EES.  

Download Chapter 1 of the Mastering EES book which provides a detailed introduction to EES.  

More information on EES and downloadable demonstrations.