Browse > Article

Effects on Refrigerant Maldistribution on the Performance of Evaporator  

Lee, Jin-Ho (School of Mechanical Engineering, Yonsei University)
Kim, Chang-Duk (Central Region Head Office, Korea Industrial Complex Corp.)
Byun, Ju-Suk (School of Mechanical Engineering, Yonsei University)
Jang, Tae-Sa (Department of Environmental Engineering, Gwangju University)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.13, no.2, 2005 , pp. 107-118 More about this Journal
Abstract
An experimental investigation was made to study two-phase flow distribution in a T-type distributor of slit fin-and-tube heat exchanger using R-22. Experiments were carried out under the conditions of saturation temperature of $5^{\circ}C$ and mass flow rate varying from 0.6 to 1.2kg/min. The inlet air has dry bulb temperature of $27^{\circ}C$, relative humidity of 50% and air velocity varying from 0.63 to 1.71m/s. A comparison was made between the predictions from the previously proposed tube-by-tube method and the present experimental data for the heat transfer rate of evaporator. Results show that $82.5\%$ increase of air velocity is needed for T-type distributor with four outlet branches than that of two outlet branches under the superheat of $5^{\circ}C$, which resulted in increasing of air-side pressure drop of $130\%$ for the former as compared to the latter.
Keywords
Evaporator; Degree of superheat; Distributor; Circuit arrangement; Tube-by-tube method;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Lee, J. H., Kwon Y. C. and Kim M. H., 2003, An improved method for analyzing a fin and tube evaporator containing a zeotropic mixture refrigerant with air mai-distribution, International Journal of Refrigeration, Vol. 26, pp. 707-720   DOI   ScienceOn
2 ASHRAE, 1993, Fundamental Handbook (SI)
3 Haraguchi, H., Koyama, S., Esaki, J. and Fujii, T., 1993, Condensation heat transfer of refrigerants HFC134a, HCFC123 and HCFC22 in horizontal smooth tube and a horizontal microfin tube, Proc., 30th National Symposia of Japan, Yokohama, pp. 343-345
4 Geary, F. D., 1975, Return bend pressure drop in refrigeration system, ASHHAE Transactions, No. 2342, pp. 252-265
5 McQuiston, F. C. and Parker, J. D., 1994, Heating, Ventilating, and Air Conditioning Analysis and Design, John Wiley & Sons, pp. 543-547
6 Natio, N., 1970, SHASE Transactions (The Society of Heating, Air-conditioning and Sanitary Engineers of Japan), Vol. 44, pp. 1-5
7 Gungor, K. E. and Winterton, R. H. S., 1986, A general correlation for flow boiling in tubes and annuli, International Journal of Heat and Mass Transfer, Vol. 19, No. 3, pp. 351-358
8 Wang, C. C., Tao, W. H. and Chang, C. J, 1999, An investigation of the airside performance of the slit fin-and-tube heat exchangers, International Journal of Refrigeration, Vol. 22, pp, 595-603   DOI   ScienceOn
9 Park, J. H., Cho, K. and Cho, H. G., 1999, Characteristics two-phase flow distribution and pressure drop in a horizontal T-type evaporator tube, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 11, No. 5, pp. 658-668
10 Wang, C. C., Chiou, C. C. and Lu, D. C., 1996, Single-phase heat transfer and flow friction correlation for micro fin tubes, International Journal of Heat and Fluid Flow, Vol. 17, pp. 500-508   DOI   ScienceOn
11 Kim, C. D., Jeon, C. D. and Lee, J., 2003, Effects of the temperature glide and superheat of R407C on the performance of evaporator, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 15, No. 10, pp. 852-859
12 McLinden, M. O., Klein, S. A., Lemmon, E. W. and Peskin, A. P., 1998, Thermodynamic and transport properties of refrigerants and refrigerant mixtures database (REFPROP), Ver. 6.01, NIST
13 Tae, S. J. and Cho, K., 2002, Two-phase flow characteristics of refrigerant in T-branch with horizontal and vertical inlet tube, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 14, No. 9, pp. 741-748
14 Ito, H,. 1960, Pressure loses in smooth pipe bends, Basic Engineering, Transaction of ASME, Vol. 3, p. 135
15 Schlager, L. M., Pate, M. B. and Bergles, A E., 1989, Heat transfer and pressure drop during evaporation and condensation of R22 in horizontal micro-fin tubes, International Journal of Refrigeration, Vol. 12, pp. 6-14
16 Domanski, P. A., 1989, EVSIM-An Evaporator Simulation Model Accounting for Refrigerant and One Dimensional Air Distribution, NISTIR 89-4133
17 Carnavos, T. C., 1980, Heat transfer performance of internally finned tube, Heat Transfer Engineering, Vol. 4, p. 32
18 Kline, S. J. and McClintock, F. A., 1953, Describing uncertainty in single sample experiments, Mechanical Engineering, Vol. 75, pp. 3-8
19 Kim, J. S., 1993, Two phase flow distribution in multi-parallel evaporator tubes (1st report: Non-heating mode), Refrigeration-Air Conditioning Engineering, Vol. 12, No. 1, pp. 1-20
20 Schlager, L. M., Pate, M. B. and Bergles, A. E., 1990, Performance predictions of refrigerant oil mixtures in smooth and internally finned tube, II, design equations, ASHRAE Transaction, Vol. 96, pp, 170-182
21 Youn, B., Park, H. Y. and Kim, C. H., 1998, Analytical model of dry surface cross-flow fin-tube heat exchanger by tube-by-tube method, Proceedings of the SAREK '98 Summer Annual Conference, pp. 1399-1404