1. Air enters a compressor at 105 kPa and 300 K with a volumetric flow rate of 12 m3 /min and exits at 1200 kPa and 400 K. Heat transfer occurs at a rate of 2 kW from the compressor to its surroundings. Assuming ideal-gas behavior for air, steady flow, and negligible effects of kinetic and potential energy determine the power input (kW) to the compressor.
2. Two staged steam turbines are arranged as shown in the diagram, with a “reheater” in between the two stages. Steam enters the first-stage turbine at 4 MPa and 500°C with a volumetric flow rate of 90 m3/min. Steam exits the turbine at 2 MPa and 400°C.The steam is then reheated at constant pressure to 500°C before entering the second-stage turbine. Steam leaves the second stage as saturated vapor at 60 kPa. For steady-state operation, and ignoring heat transfer for the two turbine stages and any effects of kinetic and potential energy, determine the following:
a) Mass flow rate of the steam (kg/h)
b) Total combined power produced by the two turbine stages (kW)
c) Rate of heat transfer to the steam in the reheater (kW)