Document Type

Dissertation

Publication Date

1991

Department

Engineering

Keywords

ASHRAE, compressor design, lubricating oil, refrigerant mixtures, viscosity

Abstract

The design and construction of a test facility and methodology for measuring the solubility and viscosity of lubricating oil/refrigerant mixtures at high pressures and temperatures are described. An auxiliary charging system, developed to provide precisely measured quantities of oil and refrigerant to the test facility, is also presented. The test facility was developed under the sponsorship and supervision of ASHRAE which funded this research project (RP-580);The solubility, viscosity and density of mixtures of R-22 and of R-502 with commonly used 150 SUS lubricants have been measured by using this facility. Specifically, results for liquid mixtures of 10% to 40% refrigerant (by mass) in a 150 SUS naphthenic oil and in a 150 SUS alkylbenzene are reported over the temperature range of 100 degrees F (38 degrees C) to 300 degrees F (149 degrees C). The oil/refrigerant mixtures for R-22 were miscible over the complete range tested, while for the R-502/naphthenic oil mixtures, two coexistent liquid phases were encountered in tests at the higher refrigerant concentrations;The property test results are presented in graphical form as well as in the form of empirical correlations based on a nonlinear regression analysis of the experimental data. Comparisons with the limited data previously published in the open literature show reasonable agreement.

Comments

  • A dissertation submitted to the graduate faculty of Iowa State University in partial fulfillment for the degree of DOCTOR OF PHILOSOPHY
  • Dr. Michael B. Pate, Committee Chairperson
  • © 1991 Nolan A. Van Gaalen

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