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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v8.i2.20
pages 77-90

Effect of Hydraulic Diameter on Condensation of R-134A in Flat, Extruded Aluminum Tubes

Ralph L. Webb
Department of Mechanical Engineering The Pennsylvania State University, University Park, PA 16802, USA
Specialist in enhanced heat transfer and heat exchanger design
Kemal Ermis
Sakarya University, Sapanca MYO, Dept. Mechanical Engineering, Sakarya, Turkey

ABSTRAKT

This paper addresses the effect of hydraulic diameter on single-phase and condensation heat transfer and pressure gradient for R-I34a in multi-port flat extruded aluminum tubes. The hydraulic diameter range of the four tubes tested is between 0.44 and 1.56 mm. This work is believed to provide condensation data on the smallest hydraulic diameters reported in the literature. The modified Wilson plot method was used to determine the heat transfer coefficient for water-side flow in the annulus. The data span 300−1000kg/m2-s mass velocity and approximately 15-to-90% vapor qualities. The condensation coefficient and pressure gradient increases with decreasing hydraulic diameter for all tubes. The effect of hydraulic diameter on condenser design and operation is also discussed. The ability of existing correlations to predict the single-phase and condensation coefficients are evaluated.


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