A study on PID control with indirect liquid/steam heating

Authors:
Cheng Hsing Hsu;Kuang-Yuan Kung;Shu-Yu Hu;Gia-Chaun Kuo
Affiliations:
Department of Mechanical Engineering, Chung-Yuan Christian University, Chung Li, Taiwan;Department of Mechanical Engineering, Nanya Institute of Technology, Chung Li, Taiwan;Department of Mechanical Engineering, Chung-Yuan Christian University, Chung Li, Taiwan;Department of Mechanical Engineering, Chung-Yuan Christian University, Chung Li, Taiwan
Venue:
WSEAS Transactions on Information Science and Applications
Year:
2009

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Abstract

The purpose of this experimental study is to reach homogeneous temperature control effect on the heat plate. In this research, the heat plate is kept constant temperature by the state of dual-phases, i.e., the state of phase change between liquid and steam, so that together with a single-point PID temperature controller only, the homogeneous temperature condition can easily be achieved with a smaller range of variation. The liquid-vapor region can stably predict the temperature for specific pressure and the specific working fluid. The experimental results show that, as far as the homogeneous temperature is concerned, the best result we got for the temperature variation is within ±0.5°C, which is superior to other researches. The system identification can discover the similar system to reach as high as 96.46% of transfer function.