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The Marginal Value of Heat in the Korean Manufacturing Industry
Open AccessArticle

Experimental Research on Heat Exchanger Control Based on Hybrid Time and Frequency Domain Identification

by 1, 2,*, 3,* and 2
1
Jiangsu Province Key Lab of Aerospace Power System, Chien-Shiung Wu College, Southeast University, Nanjing 210096, China
2
Key Lab of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
3
School of Mechanical and Electrical Engineering, Qingdao University, Ningxia Road 308, Qingdao 266071, China
*
Authors to whom correspondence should be addressed.
Sustainability 2018, 10(8), 2667; https://doi.org/10.3390/su10082667
Received: 11 May 2018 / Revised: 7 July 2018 / Accepted: 9 July 2018 / Published: 30 July 2018
(This article belongs to the Special Issue Sustainable Utilization of Waste Heat)
A heat exchanger is widely used for energy management or heat recovery in sustainable energy systems. In many application cases, the outlet temperature should be strictly controlled as desired. However, it is challenging to obtain an accurate dynamic model due to the high-order dynamics, thus reducing the control performance. To this end, this paper proposes a novel identification method by considering the heating process as an approximate second-order plus time delay (SOPDT) model. A normalized analysis indicates that the time-scaled step responses of the general second-order models almost intersect at the same point, which leads to an equation describing the sum of the time constants. Critical stability analysis based on the Nyquist criterion gives another two equations in the frequency domain. Hence the time constants and time delay can be obtained by solving the equations. Illustrative examples show the identification efficiency of the proposed method in the parameter estimation, model reduction, and anti-noise performance. With an effective identification, the high-fidelity SOPDT model makes the PID controller tuning less challengeable. The simulation results based on a benchmark heat exchanger model demonstrate the feasibility of the identification and control. Finally, a real heat exchanger control facility is built and the experimental performance agrees well with the simulation expectation, depicting a promising application prospect in future sustainable applications. View Full-Text
Keywords: heat exchanger; sustainable systems; system identification; PID control; SOPDT heat exchanger; sustainable systems; system identification; PID control; SOPDT
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MDPI and ACS Style

Jin, Y.; Sun, L.; Hua, Q.; Chen, S. Experimental Research on Heat Exchanger Control Based on Hybrid Time and Frequency Domain Identification. Sustainability 2018, 10, 2667. https://doi.org/10.3390/su10082667

AMA Style

Jin Y, Sun L, Hua Q, Chen S. Experimental Research on Heat Exchanger Control Based on Hybrid Time and Frequency Domain Identification. Sustainability. 2018; 10(8):2667. https://doi.org/10.3390/su10082667

Chicago/Turabian Style

Jin, Yuhui; Sun, Li; Hua, Qingsong; Chen, Shunjia. 2018. "Experimental Research on Heat Exchanger Control Based on Hybrid Time and Frequency Domain Identification" Sustainability 10, no. 8: 2667. https://doi.org/10.3390/su10082667

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