터보냉동기를 위한 실용적 모델링과 PI 제어기 설계

• Published in: 설비공학 논문집, 27(4) Vol. 27; no. 4; pp. 187 - 194
• Main Authors: 정석권(Seok-Kwon Jeong), 한성준(Sung-Joon Han), 정영미(Young-Mi Jung)
• Format: Journal Article
• Language: Korean
• Published: 대한설비공학회 2015
• Subjects: 기계공학; Evaporating pressure control(증발압력제어); Practical model (실용 모델); Capacity control(용량제어); PI control(PI제어); Centrifugal water chiller(터보냉동기); PI
• ISSN: 1229-6422; 2465-7611
• DOI: 10.6110/KJACR.2015.27.4.187

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.