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ACRC Technical Report 11PDF


Title:Evaporation Heat Transfer and Pressure Drop in Ozone-Safe Refrigerants and Refrigerant-Oil Mixtures
Author(s):Panek, J.S.
Contributor(s):de Souza, A.L.; Jabardo, J.M.S.; Chato, J.C.; Wattelet, J.P.
Subject(s):evaporation and condensation
Abstract:The ozone-depleting effect of chlorofluorocarbons (CFC's) has caused an intensive search for alternative fluids to be used in vapor-compression refrigeration and air-conditioning machinery. A promising replacement for CFC-12 has been identified, hydro-fluorocarbon (HFC) 134a. This new refrigerant is expected to have different heat transfer and pressure drop characteristics than CFC-12 when changing phase in the evaporator component. The presence of oil for lubrication purposes may also have an effect. Heat transfer coefficients and pressure drops of HFC-134a and CFC-12 boiling in horizontal tubes were measured. Polyalkylene Glycol (PAG) and Ester oils were mixed with HFC-134a to determine effects of various concentrations of oil. Tests were run in the mobile airconditioning range of temperature (5°C), mass fluxes (100 to 500 kg/m2s), and heat fluxes (5 to 30 kW/m2). Various inlet qualities to the test section were studied, from 20 to 60 percent. Comparison of data with previous correlations from the literature is made, and a new correlation for pure refrigerant heat transfer is proposed.
Issue Date:1992-01
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-11
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Center Project 01
Date Available in IDEALS:2009-03-06
Identifier in Online Catalog:3539145

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