Characterization of a heat exchanger by virtual temperature sensorsbased on identified transfer functions

7th European Thermal-Sciences Conference

Hadad, Waseem Al^1 ; Jannot, Yves^1 ; Maillet, Denis^1

Université de Lorraine and CNRS, LEMTA, 2 avenue de la Foret de Haye - TSA 60604, Vandoeuvre-les-Nancy Cedex

54518, France^1

关键词: Bulk temperatures;    Convolution products;    Counter flow heat exchangers;    External surfaces;    Synthetic temperature;    Temperature dependence;    Uniform temperature;    Virtual temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/745/3/032089/pdf
DOI  :  10.1088/1742-6596/745/3/032089

来源: IOP

【 摘 要 】

Under certain conditions (steady flows, no temperature dependence of thermophysical properties), the temperature rise at any point (solid or fluid) of a heat exchanger, whatever its type, is a convolution product between the thermalsource and the corresponding transfer function.Here a counter-flow heat exchanger is considered, where the hot fluid inlet temperature varies with time while the cold fluid inlet temperature is kept equal to the initial uniform temperature in the whole system. The transfer functions are estimated using synthetic temperature responses. This shows that temperature sensors located on the external surface of the exchanger can be used to detect fouling or to give informations about the outlet bulk temperatures of the fluids (steady state or transient thermal regimes).