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Evaporation heat transfer for R-22 and R-407C refrigerant-oil mixture in a microfin tube with a U-bend

Journal Article:

Abstract

Evaporation heat transfer experiments for two refrigerants, R-407C and R-22, mixed with polyol ester and mineral oils were performed in straight and U-bend sections of a microfin tube. Experimental parameters include an oil concentration varied from 0 to 5%, an inlet quality varied from 0.1 to 0.5, two mass fluxes of 219 and 400 kg m{sup -2} s{sup -1} and two heat fluxes of 10 and 20 kW m{sup -2}. Pressure drop in the test section increased by approximately 20% as the oil concentration increased from 0 to 5%. Enhancement factors decreased as oil concentration increased under inlet quality of 0.5, mass flux of 219 kg m{sup -2} s{sup -1} and heat flux of 10 kW m{sup -2}, whereas they increased under inlet quality of 0.1, mass flux of 400 kg m{sup -2} s{sup -1}, and heat flux of 20 kW m{sup -2}. The local heat transfer coefficient at the outside curvature of a U-bend was larger than that at the inside curvature of a U-bend, and the maximum value occurred at the 90{sup o} position of the U-bend. The heat transfer coefficient was larger in a region of 30 tube diameter length at the second straight section than that  More>>
Authors:
Cho, Keumnam; Tae, Sang-Jin [1] 
  1. Sungkyunkwan University, Suwon (D.P.R. of Korea). School of Mechanical Engineering
Publication Date:
May 01, 2000
Product Type:
Journal Article
Reference Number:
EDB-00:094695
Resource Relation:
Journal Name: International Journal of Refrigeration; Journal Volume: 23; Journal Issue: 3; Other Information: PBD: May 2000
Subject:
42 ENGINEERING; HEAT TRANSFER; EVAPORATION; REFRIGERANTS; TUBES; PARAMETRIC ANALYSIS; BINARY MIXTURES; MASS TRANSFER; BENCH-SCALE EXPERIMENTS
OSTI ID:
20103405
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0140-7007; IJRFDI; TRN: GB0050858
Submitting Site:
GB
Size:
page(s) 219-231
Announcement Date:

Journal Article:

Citation Formats

Cho, Keumnam, and Tae, Sang-Jin. Evaporation heat transfer for R-22 and R-407C refrigerant-oil mixture in a microfin tube with a U-bend. United Kingdom: N. p., 2000. Web.
Cho, Keumnam, & Tae, Sang-Jin. Evaporation heat transfer for R-22 and R-407C refrigerant-oil mixture in a microfin tube with a U-bend. United Kingdom.
Cho, Keumnam, and Tae, Sang-Jin. 2000. "Evaporation heat transfer for R-22 and R-407C refrigerant-oil mixture in a microfin tube with a U-bend." United Kingdom.
@misc{etde_20103405,
title = {Evaporation heat transfer for R-22 and R-407C refrigerant-oil mixture in a microfin tube with a U-bend}
author = {Cho, Keumnam, and Tae, Sang-Jin}
abstractNote = {Evaporation heat transfer experiments for two refrigerants, R-407C and R-22, mixed with polyol ester and mineral oils were performed in straight and U-bend sections of a microfin tube. Experimental parameters include an oil concentration varied from 0 to 5%, an inlet quality varied from 0.1 to 0.5, two mass fluxes of 219 and 400 kg m{sup -2} s{sup -1} and two heat fluxes of 10 and 20 kW m{sup -2}. Pressure drop in the test section increased by approximately 20% as the oil concentration increased from 0 to 5%. Enhancement factors decreased as oil concentration increased under inlet quality of 0.5, mass flux of 219 kg m{sup -2} s{sup -1} and heat flux of 10 kW m{sup -2}, whereas they increased under inlet quality of 0.1, mass flux of 400 kg m{sup -2} s{sup -1}, and heat flux of 20 kW m{sup -2}. The local heat transfer coefficient at the outside curvature of a U-bend was larger than that at the inside curvature of a U-bend, and the maximum value occurred at the 90{sup o} position of the U-bend. The heat transfer coefficient was larger in a region of 30 tube diameter length at the second straight section than that at the first straight section. (author)}
journal = {International Journal of Refrigeration}
issue = {3}
volume = {23}
journal type = {AC}
place = {United Kingdom}
year = {2000}
month = {May}
}