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ACRC Technical Report 35PDF


Title:Evaporative Characteristics of R-134a, MP-39, and R-12 at Low Mass Fluxes
Author(s):Wattelet, J.P.; Chato, J.C.; Souza, A.L.; Christoffersen, B.R.
Subject(s):refrigerant-side evaporation condensation studies
Abstract:Experimental heat transfer coefficients for R-134a, MP-39, and R-12 are reported herein. Tests were conducted using a single-tube evaporator test facility. The test section used was a 2.43 m (8-foot) long, 7.04 mm (0.277-in) inside diameter, horizontal, smooth copper tube. Heat was applied to the test section using electric resistance heaters. Test parameters were varied as follows: mass flux, 25-100 kg/m2-s (19-76 klbm/ft2-hr); heat flux, 2-10 kW/m2 (600-3200 Btu/hr-ft2); quality, 10-90 percent; saturation temperature, -15 to 5°C (5 to 41°F). The heat transfer coefficients for R-134a were higher than those of R-12 using equivalent mass flux and cooling capacity bases. The heat transfer coefficients for MP-39 were lower than those of R-12 using equivalent mass flux and cooling capacity bases. The correlations of Shah and Kandlikar were compared with the experimental heat transfer coefficients. An empirical correlation was developed for the wavy-stratified flow pattern occurring with the low mass fluxes. For correlating purposes, some high mass flux data with annular flow patterns, reported previously, are also included.
Issue Date:1993-05
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-35
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Center Project 01
Date Available in IDEALS:2009-03-13

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