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EVALUATION OF OZONE-FRIENDLY HYDROFLUOROPROPANE-BASED ZEOTROPIC REFRIGERANT MIXTURES IN A LORENZ-MEUTZNER REFRIGERATOR/FREEZER
Baskin*, E., E. Bayoglu, AND F. R. Delafield. EVALUATION OF OZONE-FRIENDLY HYDROFLUOROPROPANE-BASED ZEOTROPIC REFRIGERANT MIXTURES IN A LORENZ-MEUTZNER REFRIGERATOR/FREEZER. Presented at Presented at ASHRAE meeting, San Antonio, TX, 6/22-26/1996.
The two-evaporator (located in the freezer and fresh food compartments) design of the Lorenz-Meutzner (L-M) refrigerator/freezer (R/F) makes it a leading candidate for use of zeotropic refrigerant mixtures. Zeotrophic mixtures can have significant temperature glides during evaporation and condensation. The performance of the zeotrophic mixture can be maximized in the L-M design by permitting the lower end of the temperature glide to occur in the freezer compartment evaporator and the higher end in the fresh food compartment evaporator. Several hydrofluoropropane-based zeotropes (e.g., HFC-227ea/HFC-2445ca) have been shown through steady-state modeling to outperform HFC-134a by up to 15%. Results from previous testing of this R/F using HFC-32/HCFC-124 (zeotrope mixture) have been published: they showed approximately 3% performance gains over CFC-12. In this study, the L-M R/F having two evaporators and two intercoolers was experimentally tested in an environmental chamber according to Association of Home Appliance Manufacturers/Department of Energy testing standards using several hydrofluoropropane-based zeotropic mixtures. The results are compared to baseline testing with HFC-134a. A refrigerant sampling loop was added to determine the running composition of the mixture and its effect on the R/F performance.
Record Details:Record Type: DOCUMENT (PRESENTATION/PAPER)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL RISK MANAGEMENT RESEARCH LABORATORY
AIR POLLUTION PREVENTION AND CONTROL DIVISION
ATMOSPHERIC PROTECTION BRANCH