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Local heat transfer coefficients during boiling of R22 and R407C in horizontal smooth and microfin tubes; Coefficients d'echange locaux au cours de l'ebullition du R22 et du R407C dans des tubes horizontaux, lisse ou micro-ailete

Abstract

The purpose of this study is to experimentally investigate forced convective boiling. The heat transfer coefficients of pure refrigerant R22 and non azeotropic refrigerant mixture R407C were measured in both a smooth tube and a microfin tube. The tests have been carried out with a uniform heat flux all along the tube length. The refrigerant mass flux was varied from 100 to 300 kg m{sup -2} s{sup -1} and heat fluxes from 10 to 30 kW m{sup -2}. Local heat transfer coefficient depend strongly on heat flux at a low quality and on mass fluxes at a high quality. When compared to smooth tube, the microfin tubes exhibit a significant heat transfer enhancement, up to 180%. In comparison to R22, the R407C heat transfer coefficients of smooth and microfin tubes are 15 to 35% lower, respectively. The best heat transfer enhancement is obtained at low heat flux and mass flow rate. (Author)
Authors:
Lallemand, M; Branescu, C; Haberschill, P [1] 
  1. Centre de Thermique, INSA-CNRS, UMR 5008, Villeurbanne (France)
Publication Date:
Jul 01, 2001
Product Type:
Journal Article
Reference Number:
EDB-01:066772
Resource Relation:
Journal Name: International Journal of Refrigeration; Journal Volume: 24; Journal Issue: 1; Other Information: PBD: 2001
Subject:
42 ENGINEERING; REFRIGERANTS; ORGANIC FLUORINE COMPOUNDS; BOILING; HEAT TRANSFER; TUBES; FINS; MIXTURES; HEAT FLUX; EXPERIMENTAL DATA
OSTI ID:
20178602
Country of Origin:
United Kingdom
Language:
French
Other Identifying Numbers:
Journal ID: ISSN 0140-7007; IJRFDI; TRN: GB0120464
Submitting Site:
GB
Size:
page(s) 57-72
Announcement Date:

Citation Formats

Lallemand, M, Branescu, C, and Haberschill, P. Local heat transfer coefficients during boiling of R22 and R407C in horizontal smooth and microfin tubes; Coefficients d'echange locaux au cours de l'ebullition du R22 et du R407C dans des tubes horizontaux, lisse ou micro-ailete. United Kingdom: N. p., 2001. Web. doi:10.1016/S0140-7007(00)00064-5.
Lallemand, M, Branescu, C, & Haberschill, P. Local heat transfer coefficients during boiling of R22 and R407C in horizontal smooth and microfin tubes; Coefficients d'echange locaux au cours de l'ebullition du R22 et du R407C dans des tubes horizontaux, lisse ou micro-ailete. United Kingdom. doi:10.1016/S0140-7007(00)00064-5.
Lallemand, M, Branescu, C, and Haberschill, P. 2001. "Local heat transfer coefficients during boiling of R22 and R407C in horizontal smooth and microfin tubes; Coefficients d'echange locaux au cours de l'ebullition du R22 et du R407C dans des tubes horizontaux, lisse ou micro-ailete." United Kingdom. doi:10.1016/S0140-7007(00)00064-5. https://www.osti.gov/servlets/purl/10.1016/S0140-7007(00)00064-5.
@misc{etde_20178602,
title = {Local heat transfer coefficients during boiling of R22 and R407C in horizontal smooth and microfin tubes; Coefficients d'echange locaux au cours de l'ebullition du R22 et du R407C dans des tubes horizontaux, lisse ou micro-ailete}
author = {Lallemand, M, Branescu, C, and Haberschill, P}
abstractNote = {The purpose of this study is to experimentally investigate forced convective boiling. The heat transfer coefficients of pure refrigerant R22 and non azeotropic refrigerant mixture R407C were measured in both a smooth tube and a microfin tube. The tests have been carried out with a uniform heat flux all along the tube length. The refrigerant mass flux was varied from 100 to 300 kg m{sup -2} s{sup -1} and heat fluxes from 10 to 30 kW m{sup -2}. Local heat transfer coefficient depend strongly on heat flux at a low quality and on mass fluxes at a high quality. When compared to smooth tube, the microfin tubes exhibit a significant heat transfer enhancement, up to 180%. In comparison to R22, the R407C heat transfer coefficients of smooth and microfin tubes are 15 to 35% lower, respectively. The best heat transfer enhancement is obtained at low heat flux and mass flow rate. (Author)}
doi = {10.1016/S0140-7007(00)00064-5}
journal = {International Journal of Refrigeration}
issue = {1}
volume = {24}
journal type = {AC}
place = {United Kingdom}
year = {2001}
month = {Jul}
}