A Study on the Control Solution of Ship’s Central Fresh Water-Cooling System for Efficient Energy Control Based on Merchant Training Ship

Jeon, Tae-Youl; Lee, Chang-Min; Hur, Jae-Jung

doi:10.3390/jmse10050679

Cited by 3 publications

(3 citation statements)

References 36 publications

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“…If the control gain 𝐾 𝑠 in Equation ( 5) is converted into the form of a PI controller, it becomes Equation (6).…”

Section: 𝑞 𝑠mentioning

confidence: 99%

“…Harmonizing the control actions of the two controllers is essential for ensuring the effective and efficient operation of the ship's central cooling system [5][6][7]. As the three-way valve regulates the F.W.…”

Section: Introductionmentioning

confidence: 99%

“…pump operates at a high rotational speed, it may result in excessive energy consumption and unnecessary stress on the equipment. Therefore, it is essential to harmonize the control actions of the two controllers in order to maintain temperature stability with energy efficiency [6,8].…”

Section: Introductionmentioning

confidence: 99%

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A Study of PI Controller Tuning Methods Using the Internal Model Control Guide for a Ship Central Cooling System as a Multi-Input, Single-Output System

Jeon,

Jung

2023

JMSE

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Since the variable-speed seawater pump and the three-way valve of a ship’s central cooling system are forms of feedback from the same output signal, these controllers may cause interference when they are not coordinated. Therefore, studying an efficient control tuning method for a central cooling water system is necessary. In this study, a central cooling water system is modeled using Matlab Simulink by utilizing an actual operation dataset, and unknown parameters are estimated for fine-tuning. The simulation model is then verified using the second operating dataset. Additionally, transfer functions are developed for the freshwater output temperature against the three-way valve openness input and the electrical power frequency input to the seawater pump motor, supposing that the two systems are independent. Then, the two PI controllers are tuned using internal model control (IMC) filters. Moreover, the modified internal model control tuning method is suggested, using the character of the central cooling system, which has a large time constant for the heat exchanger system with the seawater pump and a small time constant for the three-way valve system. This method simplifies the tuning of the two combined PI controllers, enhancing the seawater pump’s overall efficiency and the three-way valve’s operation. This study presents the proposed tuning methods based on the IMC filter and modified IMC guide, which confirmed the simple determination of the gain values of the PI controller with the efficient control of the rotational speed of the seawater pump and the three-way valve with reasonable control of the freshwater outlet temperature.

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“…If the control gain 𝐾 𝑠 in Equation ( 5) is converted into the form of a PI controller, it becomes Equation (6).…”

Section: 𝑞 𝑠mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Study of PI Controller Tuning Methods Using the Internal Model Control Guide for a Ship Central Cooling System as a Multi-Input, Single-Output System

Jeon,

Jung

2023

JMSE

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Simulation Analysis and Energy Efficiency Optimization Method of Central Cooling System of 158 000 DWT Oil Tanker

Jin,

Yin,

Geng

et al. 2023

2023 7th International Conference on Transportation Information and Safety (ICTIS)

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A Study of PI Controller Tuning Methods by IMC Guide for a Ship Central Cooling System as a MISO System

Jeon,

Jung

2023

Preprint

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Since the controllers of the variable speed seawater pump and the 3-way valve of a ship central cooling system receive the feedback signal from the same output, the two controllers may interfere and operate inefficiently under certain conditions. Therefore, studying an efficient control tuning method for the central cooling water system is necessary. The central cooling water system was modeled in this study using MATLAB Simulink, utilizing actual operation data, and unknown parameters are estimated to fine-tune. The model is then verified using another operating data set. Additionally, transfer functions are developed for freshwater output temperature against 3-way valve openness input and seawater pump motor electric power frequency input. Then, the two PI controllers are tuned through the Internal Model Control guide, supposing the two systems are decoupled. Moreover, the modified IMC tuning method is suggested for the seawater pump system, which has larger time constants because of a heat exchanger. This method simplifies combining the two PI controller tuning, enhancing the seawater pump's overall efficiency and 3-way valve operation. This study determined that the proposed tuning methods through the IMC guide confirmed the efficiency of controlling the seawater pump speed and 3-way valve with reasonable control of freshwater outlet temperature.

show abstract

A Study on the Control Solution of Ship’s Central Fresh Water-Cooling System for Efficient Energy Control Based on Merchant Training Ship

Cited by 3 publications

References 36 publications

A Study of PI Controller Tuning Methods Using the Internal Model Control Guide for a Ship Central Cooling System as a Multi-Input, Single-Output System

A Study of PI Controller Tuning Methods Using the Internal Model Control Guide for a Ship Central Cooling System as a Multi-Input, Single-Output System

Simulation Analysis and Energy Efficiency Optimization Method of Central Cooling System of 158 000 DWT Oil Tanker

A Study of PI Controller Tuning Methods by IMC Guide for a Ship Central Cooling System as a MISO System

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