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A Dynamic Simulation Model of Electronic-Expansion-Valve-Controlled Evaporators  

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)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.19, no.2, 2007 , pp. 183-190 More about this Journal
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
PI; Evaporator; Electronic expansion valve; Dynamic model; Superheat; Heat pump;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
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