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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v6.i6.50
pages 441-456

A New Computational Procedure for Heat Transfer and Pressure Drop During Refrigerant Condensation Inside Enhanced Tubes

Alberto Cavallini
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

ABSTRACT

A new computational procedure for heat transfer coefficient and pressure drop during condensation of pure refrigerants and refrigerant mixtures inside enhanced tubes is presented. A modified form of the Cavallini and Zecchin equation (Cavallini and Zecchin, 1971, 1974) for smooth tube has been implemented for condensation inside low-fin, micro-fin and cross-grooved tubes: the comparison with a set of around 300 experimental data points, including both pure refrigerants, azeotropic and zeotropic refrigerant mixtures, shows an absolute mean deviation of around 15%.
Two traditional models for adiabatic pressure losses inside smooth tubes, Sardesai et al. (1982) and Friedel (1979), have been modified for condensation inside micro-fin tubes. The comparison with available experimental data, a set of around 120 data points, shows an absolute mean deviation between 21 and 24%. A further extension of the same models has been used to predict pressure drop during vaporization inside micro-fin tubes: calculated values compare very well with experimental ones.


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