Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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A Study on the Dynamic Characteristics of Nitrogen Mixed Gas for Thermostatic Expansion Valve Sensing Blub

온도 감지식 팽창밸브 감온통 질소가스 혼합냉매의 동특성 연구

  • Kim, Si-Young (Dept. of Mechanical System Engineering, Pukyong National University) ;
  • Koo, Su-Jin (Institute of Defense Science & Technology, Pukyong National University) ;
  • Ju, Chang-Sik (Dept. of Chemical Engineering, Pukyong National University)
  • 김시영 (부경대학교 기계시스템공학과) ;
  • 구수진 (부경대학교 방위과학기술연구소) ;
  • 주창식 (부경대학교 화학공학과)
  • Received : 2013.12.12
  • Accepted : 2014.01.13
  • Published : 2014.02.28
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Abstract

The pressure and temperature characteristics of mixed refrigerant gases in bulb for thermostatic expansion valve were studied using R22 refrigerant and $N_2$ gases. The characteristics of mixed refrigerant gases were investigated according to pressure variation and the variation of composition ratio of R22 refrigerant and $N_2$ gases in the temperature range of -$15^{\circ}C$~$15^{\circ}C$. The Maximum operating pressure(MOP) of mixed refrigerant gases were showed a tendency to decrease with decreasing the mixing ratio of $N_2$ gas. The characteristics in the case of the mixing ratio of 90:1 for R22 refrigerant and $N_2$ gases were the same result as Reference refrigerant. In addition, the characteristics of the mixed refrigerant gases in the mixing ratio of 90:1 for R22 refrigerant and $N_2$ gases were showed almost linear in the measurement range of pressure-temperature, and the physical properties also were showed similar results with Reference refrigerant. It was able to confirm that a MOP on the thermostatic expansion valve for sensing bulb can be maintained by adjusting the mixing ratio of R22 refrigerant and $N_2$ gases.

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References

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