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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지
DOI QR코드

DOI QR Code

Practical Modeling and PI Controller Design for Centrifugal Water Chillers

터보냉동기를 위한 실용적 모델링과 PI 제어기 설계

  • Jeong, Seok-Kwon (Dept. of Refrigeration and Air-Conditioning Engineering, Pukyong National University) ;
  • Han, Sung-Joon (Hi Air Korea R&D Center) ;
  • Jung, Young-Mi (Dept. of Refrigeration and Air-Conditioning Engineering, Pukyong National University)
  • 정석권 (부경대학교 냉동공조공학과) ;
  • 한성준 (하이에어코리아(주) 기술연구소) ;
  • 정영미 (부경대학교 냉동공조공학과)
  • Received : 2014.11.24
  • Accepted : 2015.02.09
  • Published : 2015.04.10
Download PDF
⟨ Previous Next ⟩

Abstract

This paper describes the PI controller design based on a practical transfer function model for centrifugal water chillers. The rotational speed of a compressor and the opening angle of an electronic expansion valve were simultaneously regulated as manipulated variables to maintain temperature reference and to ensure high efficiency of the chiller. The COP according to the change in each variable was investigated by performing some static experiments, and it was reflected in the PI controller design to accomplish the high efficiency control. Especially, the practical transfer function model of the chiller was built based on the dynamic experimental data considering the strong inherent non-linearity and complexity of the chiller system. The validity of the designed PI controller was proven by some experimental results using the test facility and the results were also compared to the conventional evaporating pressure control results.

Keywords

References

  1. AHRI 550/590, 2003, Performance rating of waterchilling packages using the vapor compression cycle, 2003 Standard.
  2. Lee, H. G., 2005, Centrifugal chiller features and related technologies, Journal of Korean Society for Fluid Machinery, Vol. 6, No. 4, pp. 86-93.
  3. Kwon, J. H., Byeon, J. S., and Choi, J. K., 2003, Development of an integrated controller for a direct drive turbo compressor, The Institute of Electronics and Information Engineers, Vol. 40, No. 4, pp. 225-234.
  4. Lin, J. L. and Yeh, T. J., 2007, Modeling and control of air-conditioning systems, International Journal of Refrigeration, pp. 209-220.
  5. Schurt, L. C., Hermes, C. J. L., and Neto, A. T., 2009, A Model-driven multi-variable controller for vapor compression refrigeration systems, International Journal of Refrigeration, pp. 1672-1682.
  6. Han, J. M., Yoo, H. R., Shin, M. S., and Kim, S. B., 1996, Precise temperature control by modern control method on the Refrigerator and air conditioner, Proc. of the KACC, pp. 1213-1216.
  7. Jeong, S. K., Lee, D. B., and Hong, K. H., 2014, Comparison of system performance on hot-gas bypass and variable speed compressor in an oil cooler for machine tools, Journal of Mechanical Science and Technology, Vol. 28, No. 2, pp. 721-727. https://doi.org/10.1007/s12206-013-1136-1
  8. Jeong, S. K. and Hong, K. H., 2013, Optimal PI controller design for refrigeration system considering disturbance, SAREK, Vol. 25, No. 2, pp. 85-93.
  9. Jeong, S. K. and Kim, S. H., 2011, Optimum controller design of a water cooler for machine tools based on the state space model, SAREK, Vol. 23, No. 12, pp. 782-790.
  10. Jung, Y. M. and Jeong, S. K., 2014, Optimum PI controller design for an oil cooler system using GA, Journal of Korean Society for Power System Engineering, Vol. 18, No. 5, pp. 28-34. https://doi.org/10.9726/kspse.2014.18.5.028
  11. Han, S. J., Jeong, S. K., Hong, K. H., Ryu, K. S., Kang, T. W., and Choi, W. J., 2013, PI controller design for capacity control of a centrifugal water chiller, Proc. of SAREK(summer), pp. 787-790.
  12. Lee, H. K., Yoon, P. H., Kim, C. D., and Lee, J. H., 2001, Performance test of a R134a centrifugal water chiller, SAREK, Vol. 13, No. 5, pp. 333-340.

Cited by

  1. Recent Progress in Air-Conditioning and Refrigeration Research : A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2015 vol.28, pp.6, 2016, https://doi.org/10.6110/KJACR.2016.28.6.256