Apower plant operates on a regenerative vapor power cycle with one closed feedwater heater. steam enters the first turbine stage at 120 bar, 520c and expands to 10 bar, where some of the steam is extracted and diverted to a closed feedwater heater. condensate exiting the feedwater heater as saturated liquid at 10 bar passes through a trap into the condenser. the feedwater exits the heater at 120 har with a temperature of 170°c. the condenser pressure is 0.70 bar. for isentropic processes in each turbine stage and the pump, determine for the cycle (a) the thermal efficiency and (b) the mass flow rate into the first- stage turbine, in kg/h, it the net power developed is 320 mw

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?