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ISSN 打印: 1065-5131

ISSN 在线: 1563-5074

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Indexed in

Enhanced Effect of a Horizontal Micro-fin Tube for Condensation Heat Transfer with R22 and R410A

卷 7, 册 2, 2000, pp. 97-107
DOI: 10.1615/JEnhHeatTransf.v7.i2.30
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摘要

This study presents the local heat transfer characteristics of R410A, a potential candidate for replacing R22, condensing in a horizontal smooth and a micro-fin tube. For a comparison, the R22 condensation heat transfer data are also shown.
The test sections of the present experimental apparatus consist of 7 counter-flow heat exchanger type units. The refrigerant flows in a horizontal copper tube and the cooling water flows through the annular space outside of the tube. The in-tube condensation heat transfer coefficients were obtained from the measured overall heat transfer coefficient of each test unit and the annulus-side heat transfer coefficient. The annulus-side heat transfer coefficients were determined from the correlation developed using a modified Wilson plot technique in this study.
The experiment has been conducted with the refrigerant mass flux ranging from 97 to 202 kg/ms. The condensation heat transfer coefficient of R410A in the smooth tube were compared to some existing correlations frequently referred to in open literature. The present data confirmed the applicability of the correlations to this alternative refrigerant for condensation heat transfer in smooth tubes. The enhancement ratio of the micro-fin tube ranged from 1.5 to 2.2 based on the nominal heat transfer area. It becomes higher with decreasing mass flux and increasing quality for both R22 and R410A.

对本文的引用
  1. Chamra Louay M., Tan Meng-Onn, Kung Chea-Chun, Evaluation of existing condensation heat transfer models in horizontal micro-fin tubes, Experimental Thermal and Fluid Science, 28, 6, 2004. Crossref

  2. Kwon J.T., Ahn Y.C., Kim M.H., A modeling of in-tube condensation heat transfer for a turbulent annular film flow with liquid entrainment, International Journal of Multiphase Flow, 27, 5, 2001. Crossref

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  4. Jung Dongsoo, Cho Youngmok, Park Kiho, Flow condensation heat transfer coefficients of R22, R134a, R407C, and R410A inside plain and microfin tubes, International Journal of Refrigeration, 27, 1, 2004. Crossref

  5. Huang Xiangchao, Ding Guoliang, Hu Haitao, Zhu Yu, Gao Yifeng, Deng Bin, Condensation heat transfer characteristics of R410A–oil mixture in 5mm and 4mm outside diameter horizontal microfin tubes, Experimental Thermal and Fluid Science, 34, 7, 2010. Crossref

  6. Kim Nae-Hyun, Cho Jin-Pyo, Kim Jung-Oh, Youn Baek, Condensation heat transfer of R-22 and R-410A in flat aluminum multi-channel tubes with or without micro-fins, International Journal of Refrigeration, 26, 7, 2003. Crossref

  7. Li Guan-Qiu, Wu Zan, Li Wei, Wang Zhi-Ke, Wang Xu, Li Hong-Xia, Yao Shi-Chune, Experimental investigation of condensation in micro-fin tubes of different geometries, Experimental Thermal and Fluid Science, 37, 2012. Crossref

  8. Lee E.J., Kim N.H., Byun H.W., Condensation heat transfer and pressure drop in flattened microfin tubes having different aspect ratios, International Journal of Refrigeration, 38, 2014. Crossref

  9. Chamra Louay M., Mago Pedro J., Modeling of condensation heat transfer of refrigerant mixture in micro-fin tubes, International Journal of Heat and Mass Transfer, 49, 11-12, 2006. Crossref

  10. BYUN HO-WON, LEE EUL-JONG, SIM YONG-SUP, LEE JEONG-KUN, KIM NAE-HYUN, CONDENSATION HEAT TRANSFER AND PRESSURE DROP OF R-410A IN A 5.0 MM O.D. SMOOTH AND MICROFIN TUBE, International Journal of Air-Conditioning and Refrigeration, 21, 03, 2013. Crossref

  11. Kim Nae-Hyun, Condensation heat transfer and pressure drop of R-410A in a 7.0 mm O.D. microfin tube at low mass fluxes, Heat and Mass Transfer, 52, 12, 2016. Crossref

  12. Yang Yunxiao, Jia Li, Peng Qi, Investigation on condensation heat transfer and pressure drop of R410A during upward flow in vertical smooth and micro-fin tube, International Journal of Heat and Mass Transfer, 108, 2017. Crossref

  13. Li Gang, Huang Lihao, Tao Leren, Experimental investigation of refrigerant condensation heat transfer characteristics in the horizontal microfin tubes, Applied Thermal Engineering, 123, 2017. Crossref

  14. Kumar Solanki Anand, Kumar Ravi, Condensation of R-134a inside micro-fin helical coiled tube-in-shell type heat exchanger, Experimental Thermal and Fluid Science, 93, 2018. Crossref

  15. Kim Nae-Hyun, Gook Hyung-Ho, Lee Byung-Moo, Condensation Heat Transfer and Pressure Drop of R-404A in 7.0 mm O.D. Smooth and Microfin Tube at Low Mass Fluxes, International Journal of Air-Conditioning and Refrigeration, 26, 01, 2018. Crossref

  16. Saha Sujoy Kumar, Ranjan Hrishiraj, Emani Madhu Sruthi, Bharti Anand Kumar, Advanced Internal Fin Geometries and Finned Annuli, in Heat Transfer Enhancement in Externally Finned Tubes and Internally Finned Tubes and Annuli, 2020. Crossref

  17. Mousa Mohamed H., Yang Cheng-Min, Nawaz Kashif, Miljkovic Nenad, Review of heat transfer enhancement techniques in two-phase flows for highly efficient and sustainable cooling, Renewable and Sustainable Energy Reviews, 155, 2022. Crossref

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