Method to determine the degradation of systems with joule effect from the increase in entropy (Machine-translation by Google Translate, not legally binding)

摘要

Method to determine the degradation of systems with joule effect from the increase in entropy. A method is proposed to determine the degradation of systems affected by joule effect (rdut) from the evaluation of its entropy because a system that dissipates heat resulting from the circulation of electric current undergoes a variation of entropy, susceptible to be measured, and capable of being a good estimator of the aging of the system. Measure the voltage vdut that falls on the resistive element rdut (see figure), the current flowing idut and the temperature that reaches, determines the power that dissipates and the entropy that generates δ sirr. The entropy accumulation of the resistive element, modeled as cirr, is associated with the aging of the system. Fixed a threshold limit, the end of the useful life is determined. With this method it is not necessary to know the history of the element studied. For resistive elements of storage systems, the method takes into account the generation of reversible entropy srev. (Machine-translation by Google Translate, not legally binding)