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Properties of Working Fluids for Reduced Pressure Carbon Dioxide Systems
Technical Paper
1999-01-1189
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In a companion paper, a reduced pressure carbon dioxide automotive air-conditioning system is reported [1], in which the working fluid is a mixture of CO2 and another, less volatile, liquid referred to as the co-fluid. Data essential for the study of this system includes the vapor pressure, density, viscosity and heat capacity of the pure co-fluid as well as mixtures of the co-fluid and carbon dioxide at concentrations encountered in the system. Utilization of the pressure-volume-temperature and heat capacity data is discussed in another companion paper [2]. Viscosity of the mixtures is important in studies related to compressor lubrication and heat transfer/pressure drop in the system.
This paper describes the equipment and methodology used to obtain this data, and results are given for several different co-fluids, at concentrations of 0, 10 and 20 weight percent carbon dioxide over the temperature range -20 to +100 degrees Celsius. Viscosity and pressure data are presented in the form of a Daniel Chart; accompanying plots give the density and heat capacity. Best-fit regression curves have been generated, and the properties are given in equation form as functions of the variables temperature and mass fraction CO2.
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Citation
Henderson, D., "Properties of Working Fluids for Reduced Pressure Carbon Dioxide Systems," SAE Technical Paper 1999-01-1189, 1999, https://doi.org/10.4271/1999-01-1189.Also In
References
- Spauschus H.O. Henderson D.R. Seeton C.J. Wright D.C. Zietlow D.C. Bramos G.D. Abate W. Reduced Pressure Carbon dioxide Cycle for Vehicle Climate Control SAE Paper 99xxxx 1999
- Greenfield M.L. Mozurkewich G. Schneider W.F. Bramos G.D. Zietlow D.C. Thermodynamic and Cycle Models for a Low-Pressure CO 2 Refrigeration Cycle SAE Paper 99xxxx 1999
- Spauschus H.O. Henderson D.R. New Methods of Determining Viscosity and Pressure of Refrigerant/Lubricant Mixtures Proceeding of the 1990 USNC/IIR-Purdue Refrigeration Conference 1990