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Heat transfer characteristics for evaporation of R417A flowing inside horizontal smooth and internally grooved tubes

Abstract

The experimental study on evaporation heat transfer of R417A (R125/R134a/R600) flowing inside horizontal smooth and two internally grooved tubes with different geometrical parameters was conducted with the mass flow rate range from 176 to 344 kg m{sup -2} s{sup -1}, heat flux from 11 to 32 kW m{sup -2}, evaporation temperature from 0 to 5.5{sup o}C and vapor quality from 0.2 to 1. Based on the experimental results, the mechanism and role of the mass flow rate, heat flux, vapor quality and enhanced surface influencing the evaporation heat transfer coefficients were analyzed and discussed. In comparison to R22, the evaporation heat transfer coefficients for R417A were lower and much lower in the internally grooved tubes than in the smooth tube. The present experimental results are also compared with the existing correlations, and the modified Kattan model is found to be in much better agreement with the experimental results than the Kattan model. The Koyama and Wellsandt microfin models all tend to over predict the evaporation heat transfer coefficients rather strongly for R417A inside internally grooved tubes. (author)
Authors:
Zhang, Xiaoyan; [1]  School of Energy Engineering, Xi'an University of Science and Technology, 58 Yanta Street, Xi'an, Shaanxi 710054 (China)]; Zhang, Xingqun; Chen, Yunguang; Yuan, Xiuling [1] 
  1. School of Energy and Power Engineering, Xi'an Jiaotong University, 28 Xianning Road, Xi'an, Shaanxi 710049 (China)
Publication Date:
Jun 15, 2008
Product Type:
Journal Article
Resource Relation:
Journal Name: Energy Conversion and Management; Journal Volume: 49; Journal Issue: 6; Other Information: Elsevier Ltd. All rights reserved
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; HEAT TRANSFER; EVAPORATION; TUBES; VAPORS; SULFUR IONS; REFRIGERANTS; COMPARATIVE EVALUATIONS; FLOW RATE; HEAT FLUX; MASS; MIXTURES; CORRELATIONS; SURFACES
OSTI ID:
21059691
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 0196-8904; ECMADL; TRN: GB08V1970
Availability:
Available from: http://dx.doi.org/10.1016/j.enconman.2007.11.006
Submitting Site:
GB
Size:
page(s) 1731-1739
Announcement Date:
Aug 07, 2008

Citation Formats

Zhang, Xiaoyan, School of Energy Engineering, Xi'an University of Science and Technology, 58 Yanta Street, Xi'an, Shaanxi 710054 (China)], Zhang, Xingqun, Chen, Yunguang, and Yuan, Xiuling. Heat transfer characteristics for evaporation of R417A flowing inside horizontal smooth and internally grooved tubes. United Kingdom: N. p., 2008. Web. doi:10.1016/J.ENCONMAN.2007.11.006.
Zhang, Xiaoyan, School of Energy Engineering, Xi'an University of Science and Technology, 58 Yanta Street, Xi'an, Shaanxi 710054 (China)], Zhang, Xingqun, Chen, Yunguang, & Yuan, Xiuling. Heat transfer characteristics for evaporation of R417A flowing inside horizontal smooth and internally grooved tubes. United Kingdom. doi:10.1016/J.ENCONMAN.2007.11.006.
Zhang, Xiaoyan, School of Energy Engineering, Xi'an University of Science and Technology, 58 Yanta Street, Xi'an, Shaanxi 710054 (China)], Zhang, Xingqun, Chen, Yunguang, and Yuan, Xiuling. 2008. "Heat transfer characteristics for evaporation of R417A flowing inside horizontal smooth and internally grooved tubes." United Kingdom. doi:10.1016/J.ENCONMAN.2007.11.006. https://www.osti.gov/servlets/purl/10.1016/J.ENCONMAN.2007.11.006.
@misc{etde_21059691,
title = {Heat transfer characteristics for evaporation of R417A flowing inside horizontal smooth and internally grooved tubes}
author = {Zhang, Xiaoyan, School of Energy Engineering, Xi'an University of Science and Technology, 58 Yanta Street, Xi'an, Shaanxi 710054 (China)], Zhang, Xingqun, Chen, Yunguang, and Yuan, Xiuling}
abstractNote = {The experimental study on evaporation heat transfer of R417A (R125/R134a/R600) flowing inside horizontal smooth and two internally grooved tubes with different geometrical parameters was conducted with the mass flow rate range from 176 to 344 kg m{sup -2} s{sup -1}, heat flux from 11 to 32 kW m{sup -2}, evaporation temperature from 0 to 5.5{sup o}C and vapor quality from 0.2 to 1. Based on the experimental results, the mechanism and role of the mass flow rate, heat flux, vapor quality and enhanced surface influencing the evaporation heat transfer coefficients were analyzed and discussed. In comparison to R22, the evaporation heat transfer coefficients for R417A were lower and much lower in the internally grooved tubes than in the smooth tube. The present experimental results are also compared with the existing correlations, and the modified Kattan model is found to be in much better agreement with the experimental results than the Kattan model. The Koyama and Wellsandt microfin models all tend to over predict the evaporation heat transfer coefficients rather strongly for R417A inside internally grooved tubes. (author)}
doi = {10.1016/J.ENCONMAN.2007.11.006}
journal = {Energy Conversion and Management}
issue = {6}
volume = {49}
place = {United Kingdom}
year = {2008}
month = {Jun}
}