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强化传热期刊
影响因子: 0.562 5年影响因子: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v2.i1-2.130
pages 115-125

Experimental Heat Transfer Coefficients During Condensation of Halogenated Refrigerants on Enhanced Tubes

Alberto Cavallini
Dipartimento di Fisica Tecnica, Universita di Padova, via Venezia 1,I-35131 Padova, Italy
B. Bella
Istituto di Fisica Tecnica dell'Universita di Padova Via F. Marzolo, 9-35131 Padova-Italy
Giovanni Antonio Longo
Dept. of Management and Engineering, University of Padova, Str.lla S. Nicola, 3, 36100, Vicenza - IT
Luisa Rossetto
University of Padova, Department of Industrial Engineering, via Venezia 1, 35131 Padova, Italy

ABSTRACT

The development of enhanced surfaces for condensation of refrigerants is fundamental to improve the efficiency of condensers and of refrigeration systems. The present work experimentally investigates the combined effect of geometry and vapour shear stress on heat transfer during condensation of pure refrigerant vapour on the outside of a single horizontal enhanced tube. Two different series of tests are taken: the first using a 2000 fpm (fins per meter) integral-fin tube, the second using a commercial enhanced tube (Hitachi Thermoexcel). Experimental data includes Rl1 and Rl13 runs taken with vapour pressure ranging from 111 to 190 kPa, average condensation temperature difference varying from 3.4 to 18.5 °C and maximum vapour velocity from 0.8 to 37.9 m/s. The present experimental results are compared with data previously obtained by the authors with a 1333 fpm tube and with the smooth tube trend. Also the comparisons with theoretical models for the prediction of condensation heat transfer coefficients on finned tubes are reported.


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