- Author
- Pannock, J. | Didion, D. A. | Radermacher, R.
- Title
- Performance Evaluation of Chlorine Free Zeotropic Refrigerant Mixtures in Heat Pumps.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD Maryland Univ., College Park
- Book or Conf
- 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
- Identifiers
- heat transfer fluid temperatures used for the computer simulations and tests; property data of the investigated refrigerants; determination of the operating conditions; mixture components and selection criteria; overall conductance of the heat exchangers
- 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.