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Refrigerant charge, pressure drop, and condensation heat transfer in flattened tubes

Abstract

Horizontal smooth and microfinned copper tubes with an approximate diameter of 9 mm were successively flattened in order to determine changes in flow field characteristics as a round tube is altered into a flattened tube profile. Refrigerants R134a and R410A were investigated over a mass flux range from 75 to 400 kg m{sup -2} s{sup -}2{sup 1} and a quality range from approximately 10-80%. For a given refrigerant mass flow rate, the results show that a significant reduction in refrigerant charge is possible. Pressure drop results show increases of pressure drop at a given mass flux and quality as a tube profile is flattened. Heat transfer results indicate enhancement of the condensation heat transfer coefficient as a tube is flattened. Flattened tubes with an 18{sup o} helix angle displayed the highest heat transfer coefficients. Smooth tubes and axial microfin tubes displayed similar levels of heat transfer enhancement. Heat transfer enhancement is dependent on the mass flux, quality and tube profile. (author)
Authors:
Wilson, M J; Newell, T A; Chato, J C; [1]  Infante Ferreira, C A [2] 
  1. University of Illinois, Urbana, IL (United States). Dept. of Mechanical and Industrial Engineering
  2. Delft University of Technology (Netherlands). Laboratory for Refrigeration and Indoor Climate Control
Publication Date:
Jun 01, 2003
Product Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Refrigeration; Journal Volume: 26; Journal Issue: 4; Other Information: PBD: Jun 2003
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; WORKING FLUIDS; PRESSURE DROP; HEAT TRANSFER; PIPES; PARAMETRIC ANALYSIS
OSTI ID:
20387202
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0140-7007; IJRFDI; TRN: GB0350606
Submitting Site:
GB
Size:
page(s) 442-451
Announcement Date:

Citation Formats

Wilson, M J, Newell, T A, Chato, J C, and Infante Ferreira, C A. Refrigerant charge, pressure drop, and condensation heat transfer in flattened tubes. United Kingdom: N. p., 2003. Web. doi:10.1016/S0140-7007(02)00157-3.
Wilson, M J, Newell, T A, Chato, J C, & Infante Ferreira, C A. Refrigerant charge, pressure drop, and condensation heat transfer in flattened tubes. United Kingdom. doi:10.1016/S0140-7007(02)00157-3.
Wilson, M J, Newell, T A, Chato, J C, and Infante Ferreira, C A. 2003. "Refrigerant charge, pressure drop, and condensation heat transfer in flattened tubes." United Kingdom. doi:10.1016/S0140-7007(02)00157-3. https://www.osti.gov/servlets/purl/10.1016/S0140-7007(02)00157-3.
@misc{etde_20387202,
title = {Refrigerant charge, pressure drop, and condensation heat transfer in flattened tubes}
author = {Wilson, M J, Newell, T A, Chato, J C, and Infante Ferreira, C A}
abstractNote = {Horizontal smooth and microfinned copper tubes with an approximate diameter of 9 mm were successively flattened in order to determine changes in flow field characteristics as a round tube is altered into a flattened tube profile. Refrigerants R134a and R410A were investigated over a mass flux range from 75 to 400 kg m{sup -2} s{sup -}2{sup 1} and a quality range from approximately 10-80%. For a given refrigerant mass flow rate, the results show that a significant reduction in refrigerant charge is possible. Pressure drop results show increases of pressure drop at a given mass flux and quality as a tube profile is flattened. Heat transfer results indicate enhancement of the condensation heat transfer coefficient as a tube is flattened. Flattened tubes with an 18{sup o} helix angle displayed the highest heat transfer coefficients. Smooth tubes and axial microfin tubes displayed similar levels of heat transfer enhancement. Heat transfer enhancement is dependent on the mass flux, quality and tube profile. (author)}
doi = {10.1016/S0140-7007(02)00157-3}
journal = {International Journal of Refrigeration}
issue = {4}
volume = {26}
journal type = {AC}
place = {United Kingdom}
year = {2003}
month = {Jun}
}