alexa Application of Passivity Concept for Split Range Contro
ISSN: 2157-7048

Journal of Chemical Engineering & Process Technology
Open Access

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Research Article

Application of Passivity Concept for Split Range Control of Heat Exchanger Networks

Mahitthimahawong S1, Tarapoom N2, Skogestad S3, Srinophakun T4* and Lertbumrungsuk V5
1Department of Chemical Engineering, Kasetsart University, Bangkok, Thailand
2Chemical Engineering Practice School, Department of Chemical Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
3Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
4Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Center for Advanced Studies in Industrial Technology, Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, Bangkok, Thailand
5Chemical Engineering Practice School, Department of Chemical Engineering, Silpakorn University, Thailand
Corresponding Author : Srinophakun T
Center of Excellence for Petroleum, Petrochemicals and Advanced Materials
Center for Advanced Studies in Industrial Technology
Department of Chemical Engineering, Faculty of Engineering
Kasetsart University, Bangkok, Thailand
Tel: (662)7970999
E-mail: [email protected]
Received: February 05, 2016 Accepted: February 15, 2016 Published: February 21, 2016
Citation: Mahitthimahawong S, Tarapoom N, Skogestad S, Srinophakun T, Lertbumrungsuk V (2016) Application of Passivity Concept for Split Range Control of Heat Exchanger Networks. J Chem Eng Process Technol 7:274. doi:10.4172/2157-7048.1000274
Copyright: © 2016 Mahitthimahawong S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
 

Abstract

Split range control design provides a stable and optimal operation for targeted temperatures, while the utility cost is minimized for all possible disturbance variations. An effective controller design named passivity concept is presented to regulate the stability of split range control of heat exchanger networks, in this work. The dynamic models of the proposed system are formulated in state space domain. These state space models of heat exchanger networks can represent both the process and the disturbance transfer functions. These transfer functions can determine whether the heat exchanger networks is passive or not by analyzing the passivity index. As a result, the split range control of heat exchanger networks is non-passive system. Therefore, the introduction of the weighting function is proposed to adapt the heat exchanger networks into strictly passive system. The passive controllers are then designed in order to keep the heat exchanger networks at the robust operation. The proposed method is tested and compared with PI controllers and illustrates that the passivity approach can give a better performance over conventional PI controllers. In addition, the dynamic responses of target temperature with passive controllers have a lower oscillation.

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