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Browse Conferences > IECON 2011 - 37th Annual Conf...
Nonlinear FOPDT model identification for the superheat dynamic in a refrigeration system 3
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Zhenyu Yang ; Zhen Sun ; Casper Andersen
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Abstract: An on-line nonlinear FOPDT system identification method is proposed and applied to model the superheat dynamic in a supermarket refrigeration system. The considered nonlinear FOPDT model is an extension of the standard FOPDT model by means that its parameters are time dependent. After the considered system is discretized, the nonlinear FOPDT identification problem is formulated as a Mixed Integer Non-Linear Programming problem, and then an identification algorithm is proposed by combining the Branch-and-Bound method and Least Square technique, in order to on-line identify these time-dependent parameters. The proposed method is firstly tested through a number of numerical examples, and then applied to model the superheat dynamic in a supermarket refrigeration system based on experimental data. As shown in these studies, the proposed method is quite promising in terms of reasonable accuracy, large flexibility and low computation load. The study on the superheat also clearly showed time varying properties of superheat dynamic, which indicate some necessity of adaptive mechanism of efficient superheat control. Published in: IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society Date of Conference: 7-10 Nov. 2011
INSPEC Accession Number: 12538228
Date Added to IEEE Xplore: 03 January 2012
DOI: 10.1109/IECON.2011.6119384
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Publisher: IEEE
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Conference Location: Melbourne, VIC, Australia
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I. Introduction A typical refrigeration system follows the vapor-compression principle by using some type of refrigerant as the heat transfer medium. In general, a refrigeration system consists of four basic components, namely expansion valve, evaporator, compressor and condenser [5]. One important variable that greatly affects the efficiency of this type of system is the refringent filling of the evaporator [10]. The critical factor to evaluate this filling is the superheat, which is defined as the difference between the outlet temperature of the gas and evaporation temperature in the evaporator [5]. The superheat can be controlled by adjusting the opening degree of the expansion valve. In order to maximally utilize the potential of the evaporator, the superheat needs to be kept as low as possible [7][10][12]. Read document
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IEEE Keywords Delay effects, Mathematical model, Adaptation models, Delay, Estimation, Numerical models, Steady-state INSPEC: Controlled Indexing tree searching, heat transfer, integer programming, least squares approximations, nonlinear programming, refrigeration
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INSPEC: Non-Controlled Indexing first order plus dead time model, nonlinear FOPDT system identification method, superheat dynamics, supermarket refrigeration system, mixed integer nonlinear programming problem, branchand-bound method, least square technique, superheat control
Authors Zhenyu Yang Department of Energy Technology, Aalborg University, Esbjerg Campus, Niels Bohrs Vej 8, 6700, Denmark Zhen Sun Department of Energy Technology, Aalborg University, Esbjerg Campus, Niels Bohrs Vej 8, 6700, Denmark Casper Andersen Intelligent Reliable Systems Program, Aalborg University, Esbjerg Campus, Niels Bohrs Vej 8, 6700, Denmark
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