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/Vista/XP version

Students and faculty at the University of Wisconsin may copy EES for use on their personal computers. (Others should see Download the setup_ees.exe file to a folder. Execute setup_ees.exe and follow the instructions. After EES is successfully installed, you may delete the setup_ees.exe file as it is no longer needed.

To get or view the manual, download and run ees_manual.exe or view ees_manual.pdf.

Macintosh users have two choices. They can install the Windows operating system on their Mac computer and run the Windows version. Alternatively, EES can be run from any computer, including a Mac using the XenApp program. It is first necessary to install the XenApp link on your computer. See CAE documentation. for details.

Further Information  

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

Download the Introduction to EES webinar. (Right click on download to save link to your computer.)  

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

Download a document that provides an introduction to EES.  

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

Download the EES Workshop files.  

More information on EES and downloadable demonstrations.

If you are experiencing problems with EES that you believe to be a bug in the program, send a description of your problem and the EES file to Professor S.A. Klein (