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ACRC Technical Report 167PDF


Title:A Study of Refrigerant Void Fraction and Pressure Drop in Return Bends and Development of a New Two-Phase Experimental Apparatus
Author(s):Tran, C.C.
Contributor(s):Gupta, S.; Newell, T.A.; Chato, J.C.
Subject(s):refrigerant-oil mixtures
Abstract:Void fractions and pressure drops were measured for R134a and R410A for a return bend test section consisting of three return bends of tube diameter 8.28 mm (0.326") and center-to-center distances of 25.4 mm (1.00"). The test matrix included mass fluxes from 65 kglm2 s to 440 kglm2 s (48 - 324 klbm/ft2-hr) and test section qualities from 5% to 70% with an inlet temperature of 5°C (41°F). Three orientations consisting of vertically upward, horizontal, and vertically downward were tested. Negligible effects on void fraction were measured relative to straight tubes. Pressure drop data showed some trends due to changes in quality, mass flux, refrigerant, and orientation. The pressure drop increased with both quality and mass flux. The lower pressure refrigerant had a larger pressure drop. Downflow to upflow orientations resulted in increasing pressure drop. A new apparatus for studies in evaporation was constructed at the University of Illinois at Urbana-Champaign. Details on system structure, components, and operation are given.
Issue Date:2000-06
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-167
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 100
Date Available in IDEALS:2009-05-29
Identifier in Online Catalog:4287913

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