Performance of Chlorine-Free Binary Zeotropic Refrigerant Mixtures in a Heat Pump.
Performance of Chlorine-Free Binary Zeotropic
Refrigerant Mixtures in a Heat Pump.
Pannock, J.; Didion, D. A.
NISTIR 4748; 87 p. December 1992.
Sponsor:EPRI, Palo Alto, CA
Environmental Protection Agency, Research Triangle Park,
Available from: National Technical Information Service
Order number: PB92-14981
binary zeotropic mixtures; COP; performance advantage;
R22; R23; R32; R125; R134a; R143a; R152a; predictive
models; test facility; volumetric capacity
The phase-out of the currently used refraigerants during
the next decade requires fast and accurate methods to
evaluate possible alternatives for the existing
refrigerants. This report investigates possible
replacement refrigerants for R22, where the replacements
are binary zeotropic mixtures of the following
hydrofluorocarbons (HFCs): R23, R32, R125, R134a, and
R152a. The method, that was chosen, is based on three
steps: (1) determining possible mixture components, (2)
evaluating all fifteen possible mixtures using a
simulation program developed by NIST and determining the
best performing mixtures, (3) evaluating the best
performing mixtures in a NIST build test facility.
Following this path, two refrigerant mixtures, R32/R134a
and R32/R152a were found to perform better than R22 with
respect to COP and volumetric capacity for certain
composition ranges. The used simulation model proved to
be a very precise tool in finding possible replacement
fluids and their possible performance advantages. The
results give the confidence that this time saving
combination of simulaiton and testing is a very powerful