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ACRC Technical Report 173PDF


Title:Investigation of the Effect of an R134a1Polyol Ester Mixture on Void Fraction and Pressure Drop in Horizontal Tube Evaporators
Author(s):Gupta, S.
Contributor(s):Chato, J.C.; Newell, T.A.
Subject(s):refrigerant-oil mixtures
Abstract:Void fraction, pressure drop, and oil holdup measurements were taken for smooth, axially grooved, and 18° helically grooved horizontal tubes in evaporation. All three copper test sections had an outer diameter of9.53 mm (3/8"). R134a was used in this experiment in combination with ICI's EMKARATE RL32S Polyol Ester (POE) oil. Data was taken at various operating conditions with mass fluxes ranging from 75 to 500 kg/m2s (55 - 367 klbm/ft2hr), test section inlet qualities of 10 to 70%, test section heat fluxes from 0 to 10 kW/m2, and loop oil concentrations varying from approximately 0.2 to 6% oil. All tests were run with a test section inlet temperature of 5°C (41°F). Data collected from these tests will be presented in this thesis. Void fraction and pressure drop measurements will also be compared to models developed for pure refrigerants in order to help better understand the effect of oil in refrigeration applications.
Issue Date:2000-08
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-173
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 100
Date Available in IDEALS:2009-05-29
Identifier in Online Catalog:4291836

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