Se quema n-octano [C8H18(l)] en la cámara de combus- tión de presión constante del motor de un avión con 70 por ciento de exceso de aire, que entra a la cámara de combustión a 600 kPa y 327 °C. Se inyecta combustible líquido a 25 °C, y los productos de combustión salen a 600 kPa y 1 227 °C. Determi- ne la generación de entropía y la destrucción de exergía por unidad de masa de combustible durante este proceso de com- bustión.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?