Optimal operation of heat exchanger networks based on structural information

Glemmestad, Bjørn; Mathisen, K.W.; Gundersen, Truls

doi:10.1016/0098-1354(96)00145-7

Cited by 18 publications

(17 citation statements)

References 2 publications

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“…2,10 In Lersbamrungsuk et al, 2 the split-range control structure was found using the directional effect between a manipulation and a controlled variable, 5 which may be unclear in some cases (e.g. the sign is [6] for a HEN with loops). Instead in this work we use an integer-linear programming (ILP) formulation to suggest an optimal control structure based on a split-range control scheme.…”

Section: Calandranis and Stephanopoulosmentioning

confidence: 98%

“…Split range controllers are commonly used to control two or more manipulations using a single controller. A technique using structural information (sign matrix) to find a control structure for optimal operation of HENs was proposed by Mathisen et al 5 and Glemmestad et al 6 They commented that in most case the obtained control structure can be implemented in a split-range control manner. Depending on the directional effect of the manipulations, different control configurations are possible.…”

Section: Switching Between Active Constraints Preliminariesmentioning

confidence: 99%

“…A method based on structural information using an arithmetic sign (directional effect between a manipulation and a controlled variable) to generate an optimal control policy was studied by Mathisen et al, 5 Glemmestad et al, 6 and Lersbamrungsuk et al 2 Online and periodic optimizations for the operation of HENs were studied by Aguilera and Marchetti, 7 Glemmestad et al, 8 and González et al 9 If only single bypasses and utility duties are used as manipulations, then the steady-state optimal operation of HENs can be formulated as a linear programming (LP) problem. 2,7 This assumes constant heat capacity for the streams and constant heat transfer coefficients, which is a reasonable assumption for many problems.…”

Section: Calandranis and Stephanopoulosmentioning

confidence: 99%

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Control structure design for optimal operation of heat exchanger networks

et al. 2007

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in Wiley InterScience (www.interscience.wiley.com).When only single bypasses and utility duties are used as manipulations, optimal operation of heat exchanger networks (HENs) can be categorized as an active constraint control problem. This work suggests a simple split-range control scheme to implement the optimal operation. For a given HEN and information about the disturbances, the corresponding control structure can be found by solving an integer-linear programming (ILP) problem with two objective functions providing optimal split-range pairs (for tracking active constraints during the operation) and appropriate control pairings (for fast control action). A HEN case study is used to demonstrate the application of the proposed design technique. Dynamic simulation shows the ability to provide the optimal operation of the obtained control structure.

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Section: Calandranis and Stephanopoulosmentioning

confidence: 98%

Section: Switching Between Active Constraints Preliminariesmentioning

confidence: 99%

Section: Calandranis and Stephanopoulosmentioning

confidence: 99%

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Control structure design for optimal operation of heat exchanger networks

et al. 2007

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“…Mathisen et al [6] discussed bypass selection method of HEN for controlling all critical targets, without considering utility cost. Glemmestad et al [7] proposed an optimal operation of HEN method considering both target temperatures and utility consumption minimized. Online optimization and control method was investigated by Aguilera & Marchetti [8] which can serve to have preliminary solutions to optimization problem for manipulating system.…”

Section: Introductionmentioning

confidence: 99%

Heat Exchanger Network Optimization Considering Pressure Drop Constraints based on Minimum Operating Cost

Zhao¹,

Huo²,

Yin³

2013

Int. J. Onl. Eng.

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Abstract-Considerable research effort has been reported in cost-optimal operation of heat exchanger network. However, most of them neglect the pressure drop influence and assume constant film heat transfer coefficients. Pressure drop of streams are important influencing factors for the performance of heat exchanger network operation. In this paper, a general cost-optimal operation model considering pressure drop constraints and removing the assumption of constant film heat transfer coefficients is proposed. It is necessary to determine the pumping power cost required as part of operating cost function. The extended model is applied to one example taken from previous research, and the results prove that the proposed method can obtain more real optimization results for HEN operational optimization problems.

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“…Based on a previous work on HEN control by Mathisen (1994), Glemmestad et al (1996) applied a method for optimal operation of the network and studied the coupling of manipulated variables, represented by bypasses positions on the exchangers, with controlled variables, represented by stream target temperatures. In addition to the input / output pairing in the suggested decentralized control scheme, the proposed approach also contemplated the optimization of utility consumption in the HEN, since the number of manipulated variables is greater than the number of controlled parameters, which resulted in a positive degree of freedom.…”

Section: Introductionmentioning

confidence: 99%

Multivariable Optimal Control of a Heat Exchanger Network With Bypasses

Delatore

Novazzi

Leonardi

et al. 2016

Braz. J. Chem. Eng.

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-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 performed to evaluate the controllers, involving regulatory and servo problems. The performance of the different controllers was quantitatively compared by using the integral absolute error. Although LQR is not a new control methodology, the results obtained in this work suggest that LQR is an interesting alternative to control HEN when compared to the PID and to the dynamic decoupler. Moreover, one of the main advantages of the LQR is its tuning simplicity, since only one parameter is sufficient for this application.

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Optimal operation of heat exchanger networks based on structural information

Cited by 18 publications

References 2 publications

Control structure design for optimal operation of heat exchanger networks

Control structure design for optimal operation of heat exchanger networks

Heat Exchanger Network Optimization Considering Pressure Drop Constraints based on Minimum Operating Cost

Multivariable Optimal Control of a Heat Exchanger Network With Bypasses

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