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Analysis of Heat Transfer Characteristics of Internal Heat Exchanger for $CO_2$ Refrigerator using the Hardy-Cross Method  

Kang Hee-Dong (The Graduate School of Department of Mechanical Engineering, Inha University)
Kim Ook Joong (Thermo-fluid Department, Korea Institute of Machinary & Materials)
Seo Tae-Beom (Department of Mechanical Engineering, Inha University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.1, 2005 , pp. 1-7 More about this Journal
Abstract
The heat transfer characteristics of an internal heat exchanger for $CO_2$ refrigeration cycle are numerically investigated. The numerical model is verified using the published experimental results for the concentric tube type internal heat exchanger. The Hardy-Cross Method gives very good agreement between the calculation and experimental results on the heat transfer rates and exit temperatures. Also, appropriate combination of heat transfer correlations is found. The operating parameters of the heat exchanger are calculated at transcritical region of $CO_2.$ The heat transfer rate of the counter flow type heat exchanger shows the $32\%$ greater than that of the parallel flow type heat exchanger. The increase of heat exchanger length enhances the heat transfer rate. The thermodynamic characteristics and heat transfer coefficient of $CO_2$ in the internal heat exchanger are estimated.
Keywords
Refrigerator; Internal heat exchanger; Hardy-Cross metho;
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  • Reference
1 Mclinden M. O., Klein S. A., Lemmon E. W. and Peskin A. P., 1998, NIST Thermodynamic and Transport Properties of Refrigerants and Refrigerant Mixtures-REFPROP, NIST
2 Gnielinski V., 1976, New equations for heat and mass transfer in turbulent pipe and channel flow, Int. Chem. Eng., Vol. 16, pp. 359-368
3 Fang X., Bullard C. W. and Hrnjak P. S., 2001, Heat transfer and pressure drop of gas cooler, ASHRAE transaction Part I, pp. 255-267
4 Incorpera F. P. and Dewitt D. P., 1996, Fundamental of Heat and Mass Transfer, 4th ed., John Willy & Sons, p. 424
5 Boewe D. E., Bullard C. W., Yin J. M. and Hrnjak P. S., 2001, Contribution of Internal Heat Exchanger to Transtrical R-744 Cycle Performance, Int, J. Heating, Ventilating, Air-Conditioning and Refrigerating Research, Vol. 7, pp. 155-168
6 Yoon S. H., Kim J. H., Hwang Y. W., Kim M. S., Min K. D. and Kim Y. C., 2003, Heat transfer and pressure drop characteris-tics during the in-tube cooling process of carbon dioxide in the supercritical region, Int. J. refrigeration, Vol. 26, pp. 857-864   DOI   ScienceOn
7 Park B. K., Kim G. O. and Kim M. G., 2001, Effects of Air Flow Nonuniformity on the Thermal Performance of a Compact Evaporator for Natural Working Fluids, 2001 Proceedings of the SAREK, '01 Summer Annual Conference, pp. 495-502
8 Kim M., Petterson J. and Bullard C. W., 2004, Fundamental process and system design issues in $CO_2$ vapor compression system, Process in Energy and Combustion Science, Vol. 30, Issue 2, pp. 123-124
9 Jonas M. K. and Dake, 1983, Essentials of Engineering Hydraulics, 2nd ed., Macmillan Press., pp. 87-94