12. For drying pulp slurry in a paper mill, a 15 kg/s steady supply of saturated-vapor steam at 500 kPa is required. If the steam supply will be the exhaust from a steam turbine, water at 20C, 100 kPa is pumped to a pressure of 5 MPa and then fed to a boiler with an exit at 400C, a) explain how cogeneration can be used to supply this required steam. b) determine the additional heat transfer rate to the boiler beyond what would have been required to produce only the desired steam supply, and c) determine the difference in net power of power plant (i) and (ii)