Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

INTEGTATED ANALYSIS AND CONTROL FOR THE DYNAMIC CHARACTERISTIC OF HEAT EXCHANGER SYSTEM BASED ON THERMAL RESISTANCE METHOD

Get access (open in a dialog) DOI: 10.1615/IHTC16.nee.023700
pages 7899-7906

Abstrakt

In the industrial processes, predicting the heat transfer system transient performance and making optimal control strategy requires the dynamic characteristic analysis for the overall system. In this paper, we firstly study the transient heat transfer process in an individual heat exchanger with the consideration of the hot fluid, the heat exchanger wall and the cold fluid, and derive the integrated heat transfer equation among them with the definition of the two-part thermal resistances and the heat capacity for the heat exchanger. Based om the thermo-electrical analogy method, the heat circuit model for the dynamic characteristic analysis of the single heat exchanger is defined with two thermal resistors and one thermal capacitor. On this basis, we form the heat circuit model for a four-loop refrigeration system and propose an integrated control method based on the state space analysis. This method gives optimal intermediate control temperatures according to the fluctuant heating power and forms the integrated control relationship between inputs and outputs, and in the operation simulation saves 21.12% total pump power compared with the local control method.