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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Experimental heat transfer coefficient and pressure drop during condensation of R22 and R407C inside a horizontal microfin tube

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

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

Claudio Zilio
Dept. of Management and Engineering, University of Padova, Str.lla S. Nicola, 1, VICENZA, 36100-Italy

DOI: 10.1615/IHTC12.1190
6 pages

Abstract

In-tube condensation tests for R22 and R407C are reported for a microfin tube. The experimental runs to measure heat transfer coefficients and pressure drop are carried out at an average saturation temperature of 40°C, at mass velocities ranging from 100 to 800 kg/(m2s), over the vapour quality range from 0.8 through 0.2. Heat transfer and pressure drop measurements are compared against performance of a smooth tube under the same operating conditions, to enlighten advantages and penalties of the microfin tube as compared to the smooth tube. The heat transfer enhancement depends very much on the mass velocity in the tube, and it is also affected by the zeotropic characteristics of the mixture for R407C. Comparisons with the models available in the literature are reported for R22 and R407C data. For the zeotropic mixture, a suitable correction is used in the heat transfer prediction procedure given for pure fluids.

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