Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

CYCLE_D: NIST Vapor Compression Cycle Design Program Version 3.0 Users' Guide.



Piotr A. Domanski, David Didion, J Chi


The CYCLE_D package simulates the vapor compression refrigeration cycles that use pure refrigerants or mixtures of refrigerants. The model can simulate a basic refrigeration cycle as well as a cycle with a liquidline/suction-line heat exchanger. CYCLE_D operates in a user-friendly Windows environment that facilitates evaluating the performance of selected working fluids at different operating conditions. Calculations are based on refrigerant properties as represented in the NIST Reference Fluid Thermodynamic and Transport Properties - REFPROP, Version 7.0.
NIST Standard Reference Database 49




Domanski, P. , Didion, D. and Chi, J. (2003), CYCLE_D: NIST Vapor Compression Cycle Design Program Version 3.0 Users' Guide., NIST Standard Reference Database 49, [online], (Accessed June 24, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created December 1, 2003, Updated February 19, 2017