EXERGY ANALYSIS OF SCROLL COMPRESSORS WORKING WITH R22, R407C, AND R417A AS REFRIGERANT FOR HVAC SYSTEM

Abstract

The rise in crisis of power enthralls the world economically and the options for conventional and non-conventional energy resources have been searched out. No system exists in this world with 100% efficiency due to several irreversibility's. If the output obtained from the system is maximum for a given input, maximum amount of energy can be saved globally. To understand the thermodynamic losses occurring in the system and to predict the available energy that can be tapped from the system, exergy plays a major role. Experimental study on exergy in a system can pave the way to understand the complete behavior of the system exergually. Conceptually exergy studies are based on simulation, to provide a new dimension to the concept of exergy experimental validation have been promoted. The analogy of exergy analysis of three refrigerants working in scroll compressors and their exergual features are explained in this paper. The refrigerants R22, R417A, and R407C and their thermo dynamical behavior, irreversibility were experimented in an air conditioning system with three scroll compressors, interaction between the system and the refrigerant in terms of pressure drop and heat transfer, friction has been implemented for the calculation of exergy. The entire system performance on the basis of refrigerant is validated in each part of the air conditioning system. The resultant coefficient of performanace of R407C is 2.41% less than R22 in a R22 designed scroll compressor with minimal exergy losses. The second law efficiency of 50 to 55% obtained in R22 has fewer rules over R407C and R417A which has 48 to 52%. The diminutive deviation of results encourages R417A refrigerant to be used as a substitute for R22. Thus the exergual prediction of performance of refrigerant and second law efficiency can identify the use of eco-friendly refrigerant in scroll compressor.

Keywords

Dates

  • Submission Date2007-06-27
  • Revision Date2008-12-05
  • Acceptance Date2009-01-01

DOI Reference

10.2298/TSCI0901175K

References

  1. Park, Y. C., Yongchan, K., Honghyun, C., Thermodynamic Analysis on the Performance of a Variable Speed Scroll Compressor with Refrigerant Injection, International Journal of Refrigeration, 25 (2002), 8, pp. 1072-1082
  2. Tseng, C.-H., Chang, Y.-C., Family Design of Scroll Compressor with Optimization, International Journal of Applied Thermal Engineering, 26 (2006), 10, pp. 1074-1086
  3. Zogg, M., The Swiss Retrofit Heat Pump Programme, Proceedings, 7th International Energy Agency Conference on Heat Pumping Technologies, Beijing, 2002, Vol. 1, pp. 209-218
  4. Camargo, J. R., Ebinuma, C. D., Silveira, J. L., Thermo-economic Analysis of an Evaporative Desiccant air Conditioning System, Applied Thermal Engineering, 23 (2002), 12, pp. 1537-1549
  5. Aprea, C., Mastrullo, R., Renno, C., Experimental Analysis of Scroll Compressor Performances Varying its Speed, Applied Thermal Engineering, 26 (2006), 10, pp. 983-992
  6. Aprea, C., de Rossi, F., Greco, A., Renno, C., Refrigeration Plant Exergetic Analysis Varying the Compressor Capacity, International Journal of Energy Research, 27 (2002), 7, pp. 763-774
  7. Yumrutas, R., Kunduz, M., Kanoglu, M., Exergy Analysis of Vapor Compression Refrigeration Systems, International Journal of Exergy, 2 (2002), 4, pp. 266-272
  8. Ma, G., Li, X., Exergetic Optimization of a Key Design Parameter in Heat Pump Systems with Economizer Coupled with Scroll Compressor, Energy Conversion and Management, 48 (2007), 4, pp. 1150-1159
  9. Sunder, S., Thermodynamics and Heat Transfer Modeling of a Scroll Pump, Ph. D. thesis, Massachusetts Institute of Technology, 1996
  10. Ma, G., Li, X., Exergetic Analysis of Heat Pump System with Economizer Coupled with Scroll Compressor, International Journal of Energy (accepted)
  11. Ozisik, M. N., Basic Heat Transfer, Mc Graw-Hill, New York, USA, 1997
  12. Ooi, K. T., Zhu, J., Convective Heat Transfer in Scroll Compressor Chamber: A 2-D Simulation, International Journal of Thermal Science, 43 (2004), 7, pp. 677-688
  13. Wark, K. J., Advanced Thermodynamics for Engineers, McGraw-Hill, New York, USA, 1995
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