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The air cooled automotive condensers under study are of brazed aluminium tube and center, consisting of one row array of horizontal parallel multi-port flat tubes with corrugated louver fins on the air side. Each tube is with a number of smooth parallel minichannels for internal flow of refrigerant. The analysis uses decomposition of the condenser along refrigerant flow path into specific different zones as follows: two single phase zones, namely: superheated and subcooled, and a few zones of two phase flow that can appear along some specific condensation paths to be: annular/intermittent/bubble or annular/annular-wavy/intermittent/bubble or annular/wavy/stratified. The approach presented is based on two phase flow regimes and corresponding experimental correlations for heat transfer and pressure drop. The heat transfer prediction is performed using [epsilon] - NTU[o] methodology.Results of the analysis refer to variations in the flow regimes and vapour quality along the condensation path, overall heat transfer rate, and for particular zones: contributed thermal resistances, heat transfer effectivenesses, flow lengths, heat transfer rates.
Czasopismo
Rocznik
Tom
Strony
53--74
Opis fizyczny
Wykr., rys., tab.,Bibliogr. 24 poz.,
Twórcy
autor
- Białystok Technical University, WiejsJca 45c, 15-351 Białystok, Poland
Bibliografia
- [1] KAKAÇ S., BOILERS: Evaporators and Condensers, Wiley&Sons, New York, 1991.
- [2] LEE G. H., YOO J. Y.: Performance analysis and simulation of automobile air conditioning system, Int. J. of Refrigeration, Vol. 23(2000), 243-254.
- [3] BANSAL P. K., CHIN T. C.: Design and modeling of hot-wall condensers in domestic refrigerators, Appl. Thermal Eng., Vol. 22(2002), 1601-1617.
- [4] CAVALLINI A., ZECCHIN R.: Proc. 13th Int. Congress Refrig., Washington, 1971, (quoted in [1]).
- [5] JABARDO J. M. SAIZ, MAMANI W. G.: Modeling and experimental evaluation of parallel flow micro channel condensers, J. Braz. Soc. Mech. Sci. & Eng. Vol. 25(2003), No. 2, 107-114.
- [6] INCROPERA F. P., DEWITT D. P.: Fundamentals of Heat and Mass Transfer, Wiley, 1996.
- [7] ESDU 86018, Effectiveness - NTU Relationships for the Design and Performance Evaluation of Two-Stream Heat Exchangers, ESDU, London, pp.92-107, July 1991 (quoted in [8]).
- [8] WANG C. C., ET AL.: Data reduction for air-side performance of fin and-tube heat exchangers, Exp. Thermal and Fluid Science, Vol. 21(2000), 218-226.
- [9] CHANG Y. J., WANG C. C.: A generalized heat transfer correlation for louver fin geometry, Int. J. of Heat and Mass Transfer, Vol. 40(1997), 533-544.
- [10] VDI-Wärmeatlas, 4th edition, Sections Ea4-Ea12, VDI-Verlag, 1984 (in German).
- [11] GNIELINSKI V.: New equations for heat and mass transfer in turbulent pipe and channel flow, Int. Chem. Engg., Vol. 16(1976), 359-368.
- [12] SHAH M. M.: A general correlation for heat transfer during film condensation inside pipes, Int. J. of Heat and Mass Transfer, Vol. 22(1979), 547-556.
- [13] MCNAUGHT J. M., BUTTERWORTH D.: Film condensation of pure vapour, in Heat Exchanger Design Handbook 1998, Sec. 2.6.2, ed. G. F. Hewitt, Begel House Inc.
- [14] COLLIER J. G., THOME J. R.: Convective Boiling and Condensation, 3rd edition, Oxford, 1994.
- [15] ROUHANI Z., AXELSSON E.: Calculation of void volume fraction in the subcooled and quality boiling regions, Int. J. of Heat and Mass Transfer, Vol. 13(1970), 383-393.
- [16] THOME J. R.: On recent advances in modeling of two-phase flow and heat transfer, Heat Transfer Eng., Vol. 24(2003), No. 6, 46-59.
- [17] HEWITT G. F.: Gas-liquid flow, in Heat Exchanger Design Handbook 1998, Sec. 2.3.2, ed. G. F. Hewitt, Begel House Inc.
- [18] DOBSON M.K., CHATO J. C.: Condensation in smooth tubes, J. Heat Transfer, Vol. 120(1998), No. 1, 193-213.
- [19] CAVALLINI A., ET AL.: Condensation inside and outside smooth and enhanced tubes - a review of recent research, Int. J. of Refrigeration, Vol. 26(2003), 373-392.
- [20] TAITEL Y., DUKLER A. E.: A model for prediction flow regime transitions in horizontal and near - horizontal gas-liquid flow, AIChE J., Vol. 22(1976), No. 1, 47-55.
- [21] TABATABAI A., FAGHRI A.: A new two-phase flow map and transition boundary accounting for surface tension effects in horizontal miniature and micro tubes, J. Heat Transfer, Trans. ASME, Vol.123 (2001), 958-968.
- [22] NIÑO V. G., ET AL.; two-phase flow visualization of R134A in a multiport microchannel tube, Heat Transfer Eng., Vol. 24(2003), No. 1, 41-52.
- [23] SKIEPKO T.: Thermal design of a condenser operating under mixed regime on the two-phase flow side, 3rd Int. Symp. Two-Phase Flow Modelling and Experimentation 2004, eds. G.P. Celata, et al., Pisa, Italy, 2004.
- [24] LEMMON E. W., ET AL.: Thermophysical Properties of Fluid Systems, Isothermal Properties for Ethane, 1,1,1,2-tetrafluoro- (R134a), NIST Chemistry WebBook, 2001.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BGPK-1469-5868