Consider a cogeneration power plant modified with regeneration. Steam enters the turbine at 7 MPa, 440oC at a rate of 20 kg/s and expands to a pressure of 0.4 MPa. At this pressure 60% of the steam is extracted from the turbine, and the remainder expands to 10 kPa. Part of the extracted steam is used to heat the feed water in an open feed water heater. The rest of the extracted steam is used for process heating and leaves the process heater as a saturated liquid at 0.4 MPa. It is subsequently mixed with the feed water leaving the feed water heater, and the mixture is pumped to the boiler pressure. Assuming the turbines and the pumps to be isentropic, determine:
The total power output of the turbine,
The mass flow rate of the steam through the process heater,
The rate of heat supply from the process heater per unit mass of steam passing through it and
The rate of heat transfer to the steam boiler.