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Year 1995, Volume 2 / Issue 1-2

Pages: 170

Article price - $35.00

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 A. Longo
Dipartimento di Tecnica e Gestione dei Sistemi Industriali, Universita di Padova, Viale X Giugno 22, Vicenza, I-36100, Italy

Luisa Rossetto
University of Padova, Italy

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.

pages 115-125

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