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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Dynamic Simulation Model of Electronic-Expansion-Valve-Controlled Evaporators

전자팽창밸브 제어성능 모사용 증발기 동특성 모델링

  • Shin, Young-Gy (Department of Mechanical Engineering, Sejong University) ;
  • Cho, Soo (Building Energy Research Center, Korea Institute of Energy Research) ;
  • Tae, Choon-Seob (Building Energy Research Center, Korea Institute of Energy Research) ;
  • Jang, Cheol-Yong (Building Energy Research Center, Korea Institute of Energy Research)
  • 신영기 (세종대학교 기계공학과) ;
  • 조수 (한국에너지기술연구원 건물에너지센터) ;
  • 태춘섭 (한국에너지기술연구원 건물에너지센터) ;
  • 장철용 (한국에너지기술연구원 건물에너지센터)
  • Published : 2007.02.10
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Abstract

Controlling superheat of indoor units associated with a multi-type heat pump is one of difficult tasks to be addressed. This study suggests a dynamic model of an evaporator based on heat and mass balance. Thermodynamic properties are calculated by a commercial software, Refprop. The model is programmed in MFC Visual C++ for controller interface in real-time mode. The simulation results shows that PI control works for a narrow range of superheat. Beyond the range, the temperature behavior of the refrigerant is quite nonlinear mainly due to phase change. Thus, it is concluded that PI control of superheat has to be supplemented by nonlinear control ideas to avoid saturation and excessive superheat.

Keywords

References

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