Fig. 1. Schematic drawing of the cascade refrigeration system
Fig. 2. Schematic drawing showing the control volume of the refrigeration condenser or evaporator
Fig. 3. Heat transfer coefficient of Park and Hrnjak[8] data predicted by the present model
Fig. 4. Pressure drops of Park and Hrnjak[8] datapredicted by the present model
Fig. 5. Heat transfer coefficient of Anowar et al.[12] data predicted by the present model
Fig. 6. Pressure drops of Anowar et al.[12] data predicted by the present model
Fig. 7. Schematic drawing showing the control volume of the intercooler
Fig. 8. Cascade cycle of this study
Fig. 9. Flow chart of the present cascade system
Fig. 10. Cooling capacity of the upper and lower cycle at different outdoor temperature
Fig. 11. Power consumption of the upper and lower cycle at different outdoor temperature
Fig. 12. COP of the upper and lower cycle at different outdoor temperature
Fig. 13. Cooling capacity of the upper and lower cycle with the increase of upper condenser size
Fig. 14. Power consumption of the upper and lower cycle with the increase of upper condenser size
Fig. 15. COP of the upper and lower cycle with the increase of upper condenser size
Fig. 16. Cooling capacity of the upper and lower cycle with the increase of the lower condenser size
Fig. 17. Power consumption of the upper and lower cycle with the increase of the lower condenser size
Fig. 18. COP of the upper and lower cycle with the increase of the lower condenser size
Table 1. Air and refrigerant temperatures used for the design of the refrigeration components.
Table 2. Preliminary design specification of the cascade refrigeration system having 15kW and 8 kW cooling capacity at upper and lower cycle
참고문헌
- P. K. Bansal, S. Jain, "Cascade Systems: Past, Present, and Future," ASHRAE Trans., vol. 113, pp. 245-252, 2007.
- G. D. Nicola, G. Giuliani, F. Polonara, R. Stryjek, "Blends of Carbon Dioxide and HFCs as a Working Fluids for the Low-Temperature Circuit in Cascade Refrigerating Systems," Int. J. Refrig., vol. 28, pp. 130-140, 2005. DOI: https://doi.org/10.1016/j.ijrefrig.2004.06.014
- T. S. Lee, C. H. Liu, T. W. Chen C. H., "Thermodynamic Analysis of Optimal Condensing Temperature of Cascade-Condenser in CO2/NH3 Cascade Refrigeration Systems," Int. J. Refrig., vol. 29, pp. 1100-1108, 2006. DOI: https://doi.org/10.1016/j.ijrefrig.2006.03.003
- M. M. Shah, "Chart Correlation for Saturated Boiling Heat Transfer : Equations and Further Study," ASHRAE Trans., vol. 88, pp. 185-196, 1982.
- F. W. Dittus, L. M. K. Boelter, "Heat Transfer in Automobile Radiators of the Tubular Type," University of California Publications in Engineering, vol. 2, pp. 443-461, 1930.
- L. Friedel, "Improved Friction Pressure Drop Correlations for Horizontal and Vertical Two-Phase Pipe Flow," European Two-Phase Flow Group Meeting, Ispra, Paper E2,1979.
- D. L. Gray, R. L. Webb, "Heat Transfer and Friction Correlations for Plate Fin-and-Tube Heat Exchangers Having Plain Fins," Heat Transfer 1986, 8th IHTC, pp. 2745-2750, 1986.
-
C. Y. Park, P. S. Hrnjak, "
$CO_2$ and R-410A Flow Boiling Heat Transfer, Pressure Drop, and Flow Pattern at Low Temperatures in a Horizontal Smooth Tube," Int. J. Refrig. vol. 30, pp. 166-178, 2007. DOI: https://doi.org/10.1016/j.ijrefrig.2006.08.007 - C. K. Rice, "The Effect of Void Fraction Correlation and Heat Flux Assumption on Refrigerant Charge Inventory Predictions." ASHRAE Trans., vol. 93, pp. 341-367, 1987.
- A. Premoli, D. D. Francesco, A. Prina, "A Dimensional Correlation for Evaluating Two-Phase Mixture Density." La Termotecnica, vol. 25, No. 1, pp. 17-26, 1971.
- M. M. Shah, "A General Correlation for Heat Transfer during Film Condensation inside of Pipes," Int J. Heat Mass Transfer, vol. 22, pp. 547-556, 1979. DOI: https://doi.org/10.1016/0017-9310(79)90058-9
- H. Anowar, Y. Onaka, A. Miyara, "Experimental Study on Condensation Heat Transfer and Pressure Drop in Horizontal Smooth Tube for R1234ze(E), R32 and R410A," Int. J. Refrig, vol. 35, pp. 927-938, 2012. DOI: https://doi.org/10.1016/j.ijrefrig.2012.01.002
- S. K. Fischer and C. K. Rice, "The Oak Ridge Heat Pump Models : I. A Steady-State Computer Design Model for Air-to-Air Heat Pumps," ORNL/CON-80/R1, Oak Ridge National Lab., 1980
- P. M. Dibiri, C. K. Rice, "A Compressor Simulation Method With Corrections for the Level of Suction Gas Superheat," ASHRAE Trans., vol. 87, pp. 771-782, 1981.
- N.-H. Kim, "Analysis of a Complex Refrigeration System," Final Report to LG Electronics, 2013.
- C. S. Park, H. H. Cho, Y. T. Lee, Y. C. Kim, "Mass Flow Characteristics and Empirical Modeling of R22 and R410A Flowing Through Electronic Expansion Valves," Int. J. Refrig., vol., 30, pp. 1401-1407, 2007. DOI: https://doi.org/10.1016/j.ijrefrig.2007.03.011