Given a rankine cycle with reheat operating with the following conditions: boiler exit conditions: 10 mpa, 600°c, and 7 kg/s: reheat exit conditions: 1.6 mpa and 600°c; condenser operating pressure: 30 kpa. you may assume all devices are ideal. determine the power output, heat transfer rate input required, and thermal efficiency of the plant.

To save energy, the air supply to a 2000 ft office has been shut off overnight and the room temperature has dropped to 40°f. in the morning, the thermostat is reset to 70°f and warm air at 120 f begins to flov in at 200ft'/min. the air is well mixed within the room, and an equal mass flow of air at room temperature (changing with time) is withdrawn through a return duct. the air pressure is nearly 1 atm everywhere. ignoring heat transfer with the surroundings and kinetic and potential energy effects, estimate how long it takes for the room temperature to reach 70°f. plot the room temperature as a function of time.