Experimental Investigation of Void Fraction During Refrigerant Condensation in Horizontal Tubes

Kopke, H.R.

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https://hdl.handle.net/2142/11883 Copy

Description

Title

Experimental Investigation of Void Fraction During Refrigerant Condensation in Horizontal Tubes

Author(s)

Kopke, H.R.

Contributor(s)

• Newell, T.A.
• Chato, J.C.

Issue Date

1998-08

Keyword(s)

void fraction

Abstract

This research on the condenser loop involves the experimental detennination of void fractions for both R134a and R410A in various sizes and types of horizontally mounted copper tubes. The test sections are a 6.04 mm Ld. smooth tube, an 8.89 mm Ld. axially grooved tube, and an 8.93 mm Ld. helically grooved (180 helix angle) tube. Refrigerant R134a, a primary replacement for R12, is being tested because it is used extensively. R410A is being tested because it is being considered as one of the replacement refrigerants for R22. The test matrix for the condenser loop covers a large range of mass fluxes and qualities. The test section inlet temperature is always set to 35 °C. The different inlet qualities are 10%, 30%, and 50%. The four mass fluxes which are tested are 75,150,300 and 450 kglm2-s. There are many different existing correlations for void fraction; however, they exhibit little consistency for our refrigerant condenser conditions. For this reason, new, more accurate correlations were developed from the experimental data.

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-142

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/11883

Sponsor(s)/Grant Number(s)

Air Conditioning and Refrigeration Project 74

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