A Grey-Box Dynamic Model of Plate Heat Exchangers Used in an Urban Heating System

Qingwei Miao, Shijun You, Wandong Zheng, Xuejing Zheng, Huan Zhang and Yaran Wang
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Qingwei Miao: School of Environment Science and Technology, Tianjin University, Tianjin 300072, China
Shijun You: School of Environment Science and Technology, Tianjin University, Tianjin 300072, China
Wandong Zheng: School of Environment Science and Technology, Tianjin University, Tianjin 300072, China
Xuejing Zheng: School of Environment Science and Technology, Tianjin University, Tianjin 300072, China
Huan Zhang: School of Environment Science and Technology, Tianjin University, Tianjin 300072, China
Yaran Wang: School of Environment Science and Technology, Tianjin University, Tianjin 300072, China

Energies, 2017, vol. 10, issue 9, 1-16

Abstract: This paper deals with the establishment of a grey-box model of plate heat exchangers. First, a second-order state space model of plate heat exchangers is developed. Then, the model is solved by the white-box method and grey-box method, respectively. In the white-box method, the linearization of the state space model is carried out by implicit difference scheme and the overall heat transfer coefficient was calculated with empirical correlation of the Nusselt number. In the grey-box method, a newly developed parameter identification method was established. The simulation results of two outlet temperatures by the grey-box and white-box method, respectively, are compared with the test data. It is shown that the grey-box method is more suitable and accurate for the simulations of outlet temperatures than the white-box method. Thus, it can provide practitioners and heating engineers with tools to design controllers for district heating systems.

Keywords: plate heat exchanger; grey-box method; white-box method; parameter identification (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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