Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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An Experimental Study on Flow Characteristics for Dual-Structured Orifice

이중구조 오리피스 팽창장치의 유동특성에 관한 실험적 연구

  • 곽경민 (영남대학교 부설 공업기술연구소) ;
  • 김하덕 (영남대학교 기계공학부) ;
  • 이중형 (영남대학교 부설 공업기술연구소) ;
  • 배철호 (영남대학교 기계공학부) ;
  • 김종엽 (삼성전자시스템 가전사업부)
  • Published : 2002.12.01
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Abstract

To investigate the characteristics of orifice as an expansion devices, the experimental apparatus was made and experiments are being peformed using R22 and R290. The main idea of this control method of refrigerant flow rate with coupled orifices is to control the ON/OFF state of T and Ball type orifice corresponding to the subdivided region of thermal load. When system requires minimum thermal load, both T and Ball type orifices are closed, but refrigerant can flow through small hole of T type orifice. In regular thermal load, when ball type orifice is closed, T type orifice is opened and mass flow rate increase more than OFF state of T type orifice, due to large diameter. In maximum thermal load, both T and Ball type orifices are open and the much refrigerant can flow. The flow characteristics on T type orifice and parallel-combined orifice are obtained in the subdivided region of thermal load.

Keywords

References

  1. Proceedings of the SAREK 1999 winter annual conference Heat transfer and performance characteristics of by-pass method Kwon, O. S.;Chung, J. T.
  2. Proceedings of the SAREK 2001 summer annual conference The experimental study on the comparison in performance of the system which used modulated compressors Kim, C. M.;Hwang, Y. J.;Ryu, Y. H.;Cho, K. S.
  3. Korean J. of Air-Conditioning and Refrigeration Engineering v.13 no.6 Cooling performance measurement of a 3 room type inverter heat pump system(in Korean) Chung, G. J.;Choi, Y. D.;Chang, H. W.;Song, J. B.;Park, Y. C.
  4. Korean J. of Air-Conditioning and Refrigeration Engineering v.14 no.2 Benchmark performance analysis of vapor compression system with capacity modulation compressor(in Korea) Ryu, Y. H;Hwang, Y. J.;Kim, C. M.;Cho, K. S.
  5. Korean J. of Air-Conditioning and Refrigeration Engineering v.13 no.11 Development of the dynamic simulation program for the multi-inverter heat pump air-conditioner(in Korean) Park, B. D.;Lee, J. D.;Koyama, S.;Hwang, I. N.;Chang, S. D.;Chung, B. Y.
  6. Korean J. of Air-Conditioning and Refrigeration Engineering v.13 no.9 Capacity modulation of a multi-type heat pump system using PID control with fuzzy logic(in Korean) Kim, S. Y.;Kim, M. S.
  7. Proceedings of the SAREK 2001 summer annual conference Seasonal performance analysis of the EXV used heat pump system Han, D.;Yoo, P.
  8. Proceedings of the SAREK 1996 winter Annual Conference An experimental study on the modification of short-tube geometry to optimize an inverter-driven heat pump Choi, J. M.;Kim, Y. C.;Kim, J. Y.;Park, Y. S.
  9. NIST-IR 89-4120 An experimental investigation and modeling of the flow rate of refrigerant 22 through the short tube restrictor Aaron, D. A.;Domanski, P. A.
  10. Ph.D. Dissertation, Texas A&M University Two-phase of HCFC-22 and HFC-134a through short tube orifices Kim, Y.
  11. Korean J. of Air-Conditioning and Refrigeration Engineering v.11 no.1 Experimental study on characteristics of two-phase flow through a bypass-orifice expansion device(in Korean) Choi, J. M.;Kim, Y. C.