Online system identification of heat transfers in lungs with the LMRPEM-2 method

During cardiac surgery, an extracorporeal circulation system is used. This implies that the lungs are disconnected from the body during the procedure. In order to reduce potential tissue damage, a mild hypothermia is applied to the lungs. An improved comprehension of lung heat transfer dynamics may enhance the control of such hypothermia.A thermal model based upon the thermal two-port network allows to have a broad frequency domain validity, which allow to have a valid model over the human breathing frequency range. This formalism can be adapted in order to also include the effect of blood flow, which is a natural thermal regulator for the human body. This is achieved through the combination of the thermal two-port network and the bio-heat equation.Besides the physical modeling, system identification may also be important. If one wants to track model parameter fluctuations during a procedure, a real-time system identification method is desired. Therefore, recursive methods will be developed.

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