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This paper presents a method to solve the ambipolar diffusion equation for modeling and simulating the PiN diode in silicon carbide, using an empirical approximation. Through this methodology a set of differential equations that simulate the main physical phenomena associated to the power semiconductor device are obtained. The equations, implemented in Pspice, model in a more actual form the charges behaviour in the N- region of a PiN diode in silicon carbide for the static and dynamic phases. For the verification and validation of the model, the simulation results were compared with experimental data reported in the literature, obtaining accurate results for application in power electronic. [ABSTRACT FROM AUTHOR]

This work presents a thermodynamic analysis of a cogeneration energy process with black liquor gasification obtained in pulp and paper industries, using exergy balances to identify and quantify the main irreversibilities in the process. The cogeneration process was analyzed using a commercial simulator from which it was possible to develop the exergy balance. The influence of the composition of the gases produced in the gasifier over the exergy losses in the process was evaluated. The most appropriated operating conditions in the gasifier to reduce the concentration of these components, which are responsible for the exergy losses are the low temperature (700 °C) and the low pressure (200 kPa). The analysis showed to be useful to determine the technical viability of this alternative process of energy generation using black liquor gasification. [ABSTRACT FROM AUTHOR]