Steam enters the first stage turbine at 40 bar and 500C with a volumetric flow rate of 90 m^3/min. Steam exits the turbine at 20 bar and 400C. The steam is then reheated at a constant pressure to 500C before entering the second stage turbine. Steam leaves the second stage turbine as saturated vapor at 0.6 bar. For operation at steady state, and ignoring heat transfer out of the turbines, and kinetic and potential energy effects, find: (a) mass flow rate of the steam in kg/h, (b) total power produced by the first and second stage turbines, in kW and (c) rate of heat transfer to the steam flowing through the reheater, in kW. (note. the 2 turbines are coupled together)

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?