Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Additives of mixed Gas charged in Thermostatic Bulb for Expansion Valve

팽창밸브 개폐용 감온통 혼합가스의 첨가제 연구

  • Kim, Si-Young (Dept. of Mechanical System Engineering, Pukyong National University) ;
  • Ju, Chang-Sik (Dept. of Chemical Engineering, Pukyong National University) ;
  • Koo, Su-Jin (Institute of Defense Science & Technology, Pukyong National University)
  • 김시영 (부경대학교 기계시스템공학과) ;
  • 주창식 (부경대학교 화학공학과) ;
  • 구수진 (부경대학교 방위과학연구소)
  • Published : 2014.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

The P-T characteristics of mixed refrigerant in thermostatic expansion valve sensing bulb were studied using R-134a and R-410A refrigerant. The characteristics of mixed refrigerant were investigated according to pressure variation and the variation of composition ratio of R-134A and R-410A in the temperature range of $-15^{\circ}C{\sim}15^{\circ}C$. The Thermodynamic characteristic values of the mixed refrigerants were identified using the characteristic value analysis program of mixed refrigerant(Refrop v9.0, NIST). The P-T characteristics in the case of the mixing ratio of 90:10 for R-410A and R-134A were the same result as R-22. And the physical properties showed similar results with R-22. The Maximum operating pressure(MOP) of mixed refrigerant showed a tendency to decrease with decreasing the mixing ratio of additive gases($N_2$ or He) gases. The characteristics in the case of the mixing ratio of 80:1 for mixed refrigerant and additive gases were the similar result as Reference refrigerant.(R-22 MOP, Sporlan company) In addition $N_2$ and He, both showed the same results. It was able to confirm that a MOP on the thermostatic expansion valve sensing bulb can be maintained by adjusting the mixing ratio of mixed refrigerant gases and additive gases.

Keywords

References

  1. James M. Calm, 2008, "Properties and Efficiencies of R-410A, R-421A, R-422B and R-422D compared to R-22", JMC/RMS-0807a, pp. 1-10.
  2. T. J. Park, M. K. Lee, J. H. Jeong, and K. S. Chang, 2002, "Comparison of Performance Variation between R-22 and R-410A Refrigeration Systems", Kor. J. Air-conditioning and Refrigeration Eng., pp. 166-176
  3. G. J. Park, 2005, "An Experimental Study on the Flow Condensation Heat Transfer of R-22 Alternative Refrigeration in a Multi-Channel flat Tube", IHU master dissertation, pp. 1-7.
  4. United Nations Environment Programme, 1987, "Montreal Protocol on Substances that Deplete the Ozene Layer", Final Act.
  5. H. S. Chang, 2007, "Condensation Heat Transfer Characteristics of R-410A as an Alternative R-22 in the Condenser with Small Diameter Tubes", Clean Technology, Vol. 13, No. 2, pp. 151-158.
  6. J. D. Kim, J. S. Lim and B. G. Lee, 2002, "CFC Alternative Refrigerants", Journal of the Korean Industrial and Engineering Chemistry, Vol. 13, No. 6, pp. 491-501.
  7. H. J. Kim, Y. K. Jung, H. S. Lee, J. I. Yoon and C. H. Son, 2014, "Numerical Study for the Optimal Design of Plate Heat Exchanger Using at Sea Water Air Conditioning", Journal of the Society for Power System Engineering, Vol. 18, No. 4, pp. 29-35.
  8. Wijaya, H. and Spatz, M. W., 1994, "Two-phase Flow Condensation Heat Transfer and Pressure Drop Characteristics", Proceedings of 1994 International Refrigerant Conference at Purdue, USA., pp. 305-310.
  9. Burns, L. D., Hoffman, L., and Schuster, D., 1996, "R-410A Experiences in Unitary Air-conditioner Systems", Proceedings of the International Symposium on HCFC Alternative Refrigerants, Kobe, Japan, pp. 61-66.
  10. www.kvc.com, 1999, "Data sheet danfoss termo statiske ekspansjonsventiler".
  11. D. Andrew et. al., 1968, "Modern Refrigeration and Air Conditioning", Goodheart Willcox. p. 343.
  12. www.spolan.com, 2000, "Refrigerant Pressure Temperature Table"