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Energies 2017, 10(9), 1398;

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

School of Environment Science and Technology, Tianjin University, Tianjin 300072, China
State Key Laboratory of Building Safety and Built Environment, China Academy of Building Research, Beijing 100013, China
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Received: 29 June 2017 / Revised: 7 September 2017 / Accepted: 8 September 2017 / Published: 13 September 2017
(This article belongs to the Special Issue Energy Management Control)
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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. View Full-Text
Keywords: plate heat exchanger; grey-box method; white-box method; parameter identification plate heat exchanger; grey-box method; white-box method; parameter identification

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Miao, Q.; You, S.; Zheng, W.; Zheng, X.; Zhang, H.; Wang, Y. A Grey-Box Dynamic Model of Plate Heat Exchangers Used in an Urban Heating System. Energies 2017, 10, 1398.

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