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Performance Analysis of an Ammonia(R717) and Carbon Dioxide(R744) Two-Stage Cascade Refrigeration System  

Son, Chang-Hyo (Dept. of Mechanical Engineering, Pukyong National University)
Publication Information
Journal of the Korean Institute of Gas / v.14, no.1, 2010 , pp. 1-7 More about this Journal
Abstract
In this paper, cycle performance analysis of $NH_3-CO_2$(R717-R744) two-stage cascade refrigeration system is presented to offer the basic design data for the operating parameters of the system. The operating parameters considered in this study include subcooling and superheating degree, compressor efficiency, and condensing and evaporating temperature in the ammonia(R717) high temperature cycle and the carbon dioxide low temperature cycle. The main results were summarized as follows : The COP of two-stage cascade refrigeration system increases with the increasing subcooling degree, but decreases with the increasing superheating degree. The COP of two-stage cascade refrigeration system decreases with the increasing condensing temperature, but increases with the increasing evaporating temperature. And the COP of two-stage cascade refrigeration system increases with increasing the compressor efficiency. Therefore, superheating and subcoolng degree, compressor efficiency, and evaporating and condensing temperature of $NH_3-CO_2$(R717-R744) two-stage cascade refrigeration system have an effect on the COP of this system.
Keywords
R717; R744; Two-stage cascade refrigeration system; vapor compression system; COP;
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1 EES: Engineering Equation Solver, fChart Software Inc., 2006.
2 Bhattacharyya, S., Mukhopadhyay, S., Kumar, A. and Khurana, R. K., Sarkar, J., Optimization of a $CO_{2}$-$C_{3}H_{8}$ cascade system for refrigeration and heating. Int. J. Refrigeration 28, 1284-1292, 2005.   DOI   ScienceOn
3 Bansal, P. K. and Jain, S., Cascade systems: past, present, and future. ASHRAE Trans. 113 (1), 245-252, 2007.
4 Lee, T. S., Liu, C. H. and Chen, T. W., Thermodynamic analysis of optimal condensing temperature of cascade condenser in $CO_{2}$/$NH_{3}$ cascade refrigeration systems. Int. J. Refrigeration 29, 1100-1108, 2006.   DOI   ScienceOn
5 Sawalha, S., 2005. Using $CO_{2}$ in supermarket refrigeration. ASHRAE J. 47 (8), 26-30, 2005.
6 Chaichana, C., Aye, L., Charters, W. W. S., Natural working fluids for solar-boosted heat pumps. Int. J. Refrigeration 26, 637-643, 2003.   DOI   ScienceOn
7 Park, S. N. and Kim, M. S., Performance of autocascade refrigeration system using carbon dioxide and R134a, Korea J. of Air-Conditioning and Refrigeration Eng., Vol. 11, No. 6, pp. 880-890, 1999.
8 Wilson, I. and Maier, D., Carbon dioxide for use as a refrigerant. In: Refrigeration Science and Technology, Proceedings, IIR-IRHACE Conference, Innovative Equipment and Systems for Comfort and Food Preservation. The University of Auckland, pp. 305-311, 2006.