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EVAP-COND is a software package that contains NIST's simulation models for a finned-tube evaporator and condenser. The “tube-by-tube” modeling scheme allows for specifying complex refrigerant circuits, modeling refrigerant distribution between these circuits, and accounting for non-uniform air distribution. Simulation results include local parameters for each tube such as inlet and outlet quality, temperature, enthalpy, entropy, pressure drop, mass flow rate for refrigerant and inlet and outlet temperature for air. Version 4.0 includes the option for optimization of refrigerant circuitry based on computational intelligence methods.

EVAP-COND's help menu provides information about the program's capabilities and how to use it. The instructions include preparation of input data, execution of the program, and examination of simulation results. The format of input data files is fully compatible with Versions 2.3 and 3.0. The graphical user interface contains several convenience features, including the ability to modify the existing refrigerant circuitry.



  • Tube-by-tube or tube sectional simulation
  • One-dimensional, non-uniform air distribution
  • Simulation of refrigerant distribution
  • Refrigerant circuitry optimization
  • Condenser model capable of simulating above the critical point
  • REFPROP version 9.1 refrigerant properties
  • 15 refrigerants and refrigerant mixtures: R22, R32, R116, R134a, R152a, R290, R404A, R407C, R410A, R507A, R600a, R717, R744, R1234yf and R1234ze(E)


This software was developed by the National Institute of Standards and Technology (NIST), is not subject to copyright protection, and is in the public domain. It can be used freely provided that any derivative works bear some notice that they are derived from it. NIST used its best efforts to provide a high quality simulation tool and to select modeling methods and correlations based on sound scientific judgment. However, NIST assumes neither responsibility nor liability for any damage arising out of or relating to the use of EVAP-COND. The software is provided "AS IS"; NIST makes NO GUARANTIES and NO WARRANTIES OF ANY TYPE, expressed or implied, including NO WARRANTY OFMERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.


Version: 4.0 (b)

Last Updated: May 2016

Type of software: Simulation Models for Finned-Tube Heat Exchangers with Circuitry Optimization


Piotr A. Domanski, NIST
David Yashar, NIST
Janusz Wojtusiak, GMU 


EVAP-COND Registration and Download (91.4 MB) VERSION 4.0 (b) -- May 2016

System Requirements
Personal computer with Windows XP, Windows7, Windows8, and Windows10 operating system

Installation Procedure
Download the file EVAP-COND.zip and extract all files to a folder of your choice. Then execute Setup.exe contained in this folder. This will begin the installation wizard. Follow the prompts.

* To execute a file, locate the file in the folder and double-click on it.
The installation process will:
a. Install the EVAP-COND package in the folder of your designation.  
b. Create the EVAP-COND startup group accessible from the Start button. 
c. Create the EVAP-COND shortcut and place an icon on the desktop.