Operation of Compressor and Electronic Expansion Valve via Different Controllers

Ekren, Orhan; Şahin, Savaş; İşler, Yalçın

doi:10.5772/37022

Cited by 2 publications

(2 citation statements)

References 26 publications

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“…The autoclave system is controlled by two conventional methods: on-off and PID [16]. Simplicity and low cost are the advantages of on-off method but following the inconstant surfaces is difficult and also amortization of input valve is another drawback.…”

Section: Steaming Roommentioning

confidence: 99%

Horizontal and Vertical Rule Bases Method in Fuzzy Controllers

Aminifar

Marzuki

2013

Mathematical Problems in Engineering

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Concept of horizontal and vertical rule bases is introduced. Using this method enables the designers to look for main behaviors of system and describes them with greater approximations. The rules which describe the system in first stage are called horizontal rule base. In the second stage, the designer modulates the obtained surface by describing needed changes on first surface for handling real behaviors of system. The rules used in the second stage are called vertical rule base. Horizontal and vertical rule bases method has a great roll in easing of extracting the optimum control surface by using too lesser rules than traditional fuzzy systems. This research involves with control of a system with high nonlinearity and in difficulty to model it with classical methods. As a case study for testing proposed method in real condition, the designed controller is applied to steaming room with uncertain data and variable parameters. A comparison between PID and traditional fuzzy counterpart and our proposed system shows that our proposed system outperforms PID and traditional fuzzy systems in point of view of number of valve switching and better surface following. The evaluations have done both with model simulation and DSP implementation.

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Section: Steaming Roommentioning

confidence: 99%

Horizontal and Vertical Rule Bases Method in Fuzzy Controllers

Aminifar

Marzuki

2013

Mathematical Problems in Engineering

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“…In the control system theory, a transfer function in Laplace s-Fig. 3 Experimental plant [17] domain represents the relationships between the input and the output of the system model. There are two commonly used forms for transfer functions as a first-order linear dynamical…”

Section: Decoupled System Modellingmentioning

confidence: 99%

Development and evaluation of transfer functions for a variable speed compressor

Ekren

Şahin

İşler³

2011

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this study, transfer functions of electronic expansion valve and variable speed scroll compressor in a chiller system are developed based on an experimental analysis. Dynamic behaviours of water temperature at chiller output and refrigerant superheat at evaporator outlet have either the first-or the second-order linear models, respectively. Different from the existing modelling studies in literature novel models are presented for variable speed refrigeration system with scroll compressor and liquid type evaporator. The scroll compressor used in the current study is not produced for variable speed operation however it is operated with some limitations in the range of 30 to 50 Hz through an inverter. Similar restrictions are presented for the electronic expansion valve as 10 per cent to 35 per cent opening range because of operational limitations. To validate transfer functions of the variable speed scroll compressor and electronic expansion valve, mean square error values for all transfer functions are calculated. The mean square error values vary between 0.0126 and 0.3116. In addition, all transfer functions are designed and tested using corresponding proportional-integral-derivative controllers in order to see their applicability. The results indicate that energy savings are a consequence of operating the chiller at smaller frequencies than the basic 50 Hz while partial load occurred.

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Operation of Compressor and Electronic Expansion Valve via Different Controllers

Cited by 2 publications

References 26 publications

Horizontal and Vertical Rule Bases Method in Fuzzy Controllers

Horizontal and Vertical Rule Bases Method in Fuzzy Controllers

Development and evaluation of transfer functions for a variable speed compressor

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