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.

Performance of R-22 And Its Alternatives Working At High Outdoor Temperatures



S F. Yana Motta, Piotr A. Domanski


This paper examines the performance of R-22 and its possible replacements in an air-cooled air conditioner. The study focuses on the effect ofelevated outdoor temperatures on system capacity and Coefficient of Performance (COP). The refrigerants considered are R-22, R-134a, R-290,R-410A and R-407C. Relative merits of these fluids are evaluated using the UA version of NIST's semi-theoretical vapor-compression model CYCLE-11. The study includes performance results for the basic cycle and for the cycle with a liquid-line/suction-line heat exchanger. The examined refrigerants exhibit varying degradations in performance at elevated temperatures compared to their performance at a typical operating regime. Different refrigerants' critical temperatures and differences in the shape of thetwo-phase dome on the temperature-entropy diagram can explain different performance trends for refrigerant studied.
Proceedings Title
International Refrigeration Conference | 8th | | np
Conference Dates
July 25-28, 2000
Conference Title
International Refrigeration Conference


air conditioning, alternative refrigerants, coefficient of performance, modeling, refrigerant mixtures, refrigeration


Yana, S. and Domanski, P. (2000), Performance of R-22 And Its Alternatives Working At High Outdoor Temperatures, International Refrigeration Conference | 8th | | np (Accessed May 26, 2024)


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

Created July 1, 2000, Updated February 19, 2017