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DOI: 10.1615/ICHMT.2000.TherSieProcVol2.530
page 132

Alberto Cavallini
Dipartimento di Fisica Tecnica, Universita di Padova, via Venezia 1,I-35131 Padova, Italy

Giuseppe Censi
Dipartimento di Fisica Tecnica, Universita di Padova, via Venezia 1,I-35131 Padova, Italy

Davide Del Col
University of Padova, Department of Industrial Engineering, Via Venezia 1, 35131 Padova, Italy

Luca Doretti
Dept. of Civil, Architectural and Environmental Engineering, University of Padova, Via Venezia 1, 35131, Padova - IT

Luisa Rossetto
University of Padova, Department of Industrial Engineering, via Venezia 1, 35131 Padova, Italy

Giovanni Antonio Longo
Dept. of Management and Engineering, University of Padova, Str.lla S. Nicola, 3, 36100, Vicenza - IT


The object of the present paper is related to the design of condensers for the non-azeotropic mixtures of refrigerants. The high temperature glide mixture R-125/236ea at three different compositions (0.30/0.70, 0.46/0.54, 0.64/0.36 by mass) was tested during condensation inside a 2 m long smooth horizontal tube-in-tube exchanger. The superheated vapour entering the tube is first cooled and then condensed against cold water flowing in the annulus. The experimental data, taken at 400 and 750 kg/(m2 s) mass velocity, is used for comparison against the method of Colburn and Drew (1937). It is shown that the above method gives a reasonably good prediction of the heat flux exchanged in the tube.

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