Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Fuzzy Control with Feedforward Compensator of Superheat in a Variable Speed Refrigeration System

  • Hua, Li (Department of Refrigeration and Air-Conditioning Engineering, Graduate School, Pukyong National University) ;
  • Lee, Dong-Woo (Pukyong National University) ;
  • Jeong, Seok-Kwon (Division of Mechanical Engineering, Pukyong National University) ;
  • Yoon, Jung-In (Pukyong National University)
  • Published : 2007.05.31
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Abstract

In this paper, we suggest fuzzy control with feedforward compensator of superheat to progress both energy saving and coefficient of performance(COP) in a variable speed refrigeration system. The capacity and superheat are controlled simultaneously and independently by an inverter and an electronic expansion valve respectively for saving energy and improving COP in the system. By adopting the fuzzy control. the controller design for the capacity and superheat is possible without depending on a dynamic model of the system. Moreover, the feedforward compensator of the superheat can eliminate influence of the interfering loop between capacity and superheat. Some experiments are conducted to design the appropriate fuzzy controller by an iteration manner. The results show that the proposed fuzzy controller with the compensator can establish good control performances for the complicated refrigeration system with inherent strong non-linearity.

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References

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