AUGMENTATION OF R-113 IN-TUBE EVAPORATION WITH MICRO-FIN TUBES.
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One of the most effective techniques for augmenting in-tube evaporation heat transfer in refrigeration and air conditioning systems is to use internally finned tubes. In this study, the effects of several geometrical parameters of micro-finned tubes were experimentally investigated for single-phase and evaporation heat transfer. Specifically, the geometrical parameters studied were peak shape, valley shape, fin height, number of fins, and spiral angle. Commercial refrigeration and air-conditioning tubes with 3/8 in (9. 52 mm) od were tested using refrigerant R-113 in a 39 in (1. 0 m) long test section. The mass velocity range was varied from 145,000 lbm/hr multiplied by (times) ft**2 (197 kg/s multiplied by (times) m**2) to 440,000 1bm/hr multiplied by (times) ft**2 (594 kg/s multiplied by (times) m**2) while the average quality over the test section varied from 0. 15 to 0. 85. The system pressure was maintained at about 35 psi (241 kPa).
author list (cited authors)
Khanpara, J. C., Bergles, A. E., & Pate, M. B.