Performance Evaluation of Chlorine Free Zeotropic Refrigerant Mixtures in Heat Pumps.
Performance Evaluation of Chlorine Free Zeotropic
Refrigerant Mixtures in Heat Pumps.
(4059 K)
Pannock, J.; Didion, D. S.; Radermacher, R.
International Institute of Refrigeration. Proceedings.
July 1992, 1992.
Keywords:
refrigerants; heat pumps; chlorine; performance
evaluation; fluids; mixtures; ozone; temperature; heat
transfer; computer simulation; mixtures; entropy
Abstract:
Fifteen binary zeotropic refrigerant mixtures consisting
of the components R23, R32, R125, R133a, R143a, and
R152a are investigated as possible replacement fluids
for R22. The two mixtures of R32/R134a and R32/R152a
showed COP improvements over R22 of up to 24% (depending
on the operating condition and mixture composition) at
the same capacity as with R22 while using counter flow
heat exchange in evaporator and condenser. The use of a
liquid line to suction line heat exchanger proved to be
advantageous for both mixtures. The overall conductance
for both mixtures is evaluated to be equal to or up to
22% greater (R32/R152a) than that of R22. Therefore, the
heat exchanger size used with R22 should be sufficient
to achieve performance increases with these zeotropic
mixtures.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899