Determining of the thermophysical properties of materials with indirect control of the temperature of the medium bordering the wall

Temperature control of a medium bounded by walls without direct placement of sensors in it is important to ensure efficient operation of many devices and process units (heat treatment devices, engines, reactors, etc.). However, development of a monitoring method with a wide scope of application requires automation of determination of thermophysical properties of wall and medium materials without specialized tests, which is difficult due to the individual specifics of each object. The paper presents the results of determining the thermophysical properties of materials during indirect monitoring of the temperature of the medium bordering the wall. We investigated the difficulties arising in the automation of determining the properties of materials during adaptation of models of complex heat exchange between the medium and the wall with partially uncertain properties. We used simplified heat exchange models making it possible to present the model signals as increments relative to the initial moment for the time period and to reduce the effect of the mismatch between the functional form of the model and the object on the indirect monitoring results. The parameters unknown during model adaptation were determined based on retrospective data of a limited time domain. It is shown that the model can be used to monitor a generalized estimate of the temperature of the medium near the point of temperature monitoring in the wall with subsequent prediction of the consequences of varying the temperature of the isolated medium. The efficiency of the proposed approach is demonstrated using a case study of heating fireclay bricks. The results obtained can be used in developing universal temperature control methods applicable to various objects.

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