Evaporation Heat Transfer and Pressure Drop in Ozone-Safe Refrigerants and Refrigerant-Oil Mixtures

Panek, J.S.

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https://hdl.handle.net/2142/9700 Copy

Description

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.

Issue Date

1992-01

Keyword(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.

Publisher

Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.

Series/Report Name or Number

Air Conditioning and Refrigeration Center TR-11

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/9700

Sponsor(s)/Grant Number(s)

Air Conditioning and Refrigeration Center Project 01

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