Agas within a piston-cylinder assembly executes a carnot power cycle during which the isothermal expansion occurs at th 5 600 k and the isothermal compression occurs at tc 5 300 k. determine (a) the thermal efficiency. (b) the percent change in thermal efficiency if th increases by 15% while tc remains the same. (c) the percent change in thermal efficiency if tc decreases by 15% while th remains the same. (d) the percent change in thermal efficiency if th increases by 15% and tc decreases by 15%.

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.