2016
DOI: 10.1590/0104-6632.20160331s00002780
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Multivariable Optimal Control of a Heat Exchanger Network With Bypasses

Abstract: -Heat exchanger networks present an interesting control problem due to coupling among process streams. In this work, the linear quadratic regulator (LQR), a feedback optimal control technique, is used to control stream temperatures on a laboratory scale heat exchanger network, through bypass manipulation, in a multivariable system. The LQR design was based on a mathematical model of the plant and its performance was compared to traditional PID control and to dynamical decoupling. Experimental tests were perfor… Show more

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Cited by 7 publications
(6 citation statements)
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“…Consequently, in the transformed state space in (4), the controller needs to be designed such that is regulated to zero. Thus, the dynamic error is defined as (6).…”
Section: Methods 21 Mathematical Modeling Of the Plate Heat Exchangermentioning
confidence: 99%
See 1 more Smart Citation
“…Consequently, in the transformed state space in (4), the controller needs to be designed such that is regulated to zero. Thus, the dynamic error is defined as (6).…”
Section: Methods 21 Mathematical Modeling Of the Plate Heat Exchangermentioning
confidence: 99%
“…Int J Elec & Comp Eng ISSN: 2088-8708  Time-varying sliding mode controller for heat exchanger with dragonfly algorithm (Arsit Boonyaprapasorn) 3959 Linear and nonlinear feedback controls have been applied for temperature control of heat exchangers [2]- [11], e.g., the robust controller [5], the linear quadratic regulator [6], and the proportionalintegral-derivative (PID) controller based on the internal model [9]. However, since the heat exchanger is a nonlinear dynamical system, the feedback controller designed using an approximated linear model may perform effectively only around the equilibrium point.…”
Section: Introductionmentioning
confidence: 99%
“…The generally accepted logic of solving the formulated problem leads to the replenishment of conservation laws with models of elements [6,7], [8] and iterative schemes for its solution [9,10], [11]. The disadvantages of this approach are well known (see, for example, [15]).…”
Section: Analysis Of the Bypass Connection Modelmentioning
confidence: 99%
“…A neural network intelligent control is proposed for a network of heat exchangers based on a lumped model and accepted constraints. The design of heat exchange systems is also associated with the provision of HEN flow control capabilities in the heat exchanger network, and bypass manipulation provides higher dynamic characteristics of the system [8], as well as increased reliability in the event of equipment failure [9]. Ease of maintaining the flow temperature in the network, changing the outlet flow in the network at set values or changing the outlet flow for new target values is achieved by adjusting the bypass flow in some or all of the heat exchangers [10].…”
mentioning
confidence: 99%
“…In the literature, the bypass control of HEN was formulated using deterministic approaches like linear quadratic regulator (LQR). [4] The optimal bypass location was selected by calculating the non-square relative gain array. [1] The control problem of the HEN is considerably challenging because of the highly non-linear dynamics and significant disturbances in inlet temperatures of streams.…”
Section: Introductionmentioning
confidence: 99%