In a regenerative steam cycle employing three closed feedwater heaters, the steam is supplied to the turbine at 42 bar and 500 °c and is exhausted to the condenser at 0.035 bar. the bleed steam for feed heating is taken at pressures of 15, 4 and 0.5 bar. assuming ideal processes and neglecting pump work, calculate: (a) the fraction of the boiler steam bled at each stage (b) the power output of the plant per unit mass flow rate of boiler steam. (c) the cycle efficiency. and (d) the specific steam consumption

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?