1.0 kg of air at 300 k and 100 kpa (state 1) is slowly compressed in a piston cylinder (closed system). the compression process is an isothermal process (t= constant) which is a special polytropic process with a polytropic index n i. the pressure of the air at the end of the compression process is 300 kpa (p2). assuming that air is an ideal gas with constant specific heats. a)- find the work transfer in this compression process b)- find the heat transfer in this compression process. ignoring the kinetic and potential energy changes. c)- find the isentropic efficiency of this compressor

To design a steam turbine to produce 12,000 hp power. a engineer comsiders using a steady state stean low st 1160fr and engineer considers using a steady state steam flow at 1160°r and 450 psia to drive this steam turbine. the exhaust of the steam is cooled by the lake (vacuum). heat losing to the surroundings is measured at a rate of 555.55 btu/s. (a) sketch the system with the given conditions. (b) neglecting kinetic and potential energy changes from inlet to exit, determine the volumetric flow rate of the steam at the inlet, (ft'/hr). must clearly show unit conversions at crtical terms.