Question: Consider a cogeneration system operating as shown in the figure. The steam generator provides 1.0x106 kg/h of steam at 8 MPa, 640C. Steam is extracted


Consider a cogeneration system operating as shown in the figure. The steam generator provides 1.0x106 kg/h of steam at 8 MPa, 640C. Steam is extracted between the first and second turbine stages at 1 MPa and diverted to a process heating load. The process heating load is 9.5x108 kJ/h. Condensate returns from the process heating load at 0.95 MPa, 120C and is mixed with liquid exiting the lower-pressure pump at 0.95 MPa. The entire flow is then pumped to the steam generator pressure. Saturated liquid at 8 kPa leaves the condenser. The turbine stages and the pumps operate with isentropic efficiencies of 86 and 80%, respectively. Fuel (1) -Cooling tower To cooling tower tw (1) + Condensate (1 - y) (1-y) Steam (V) w Condensate a) Determine the mass flow rate extracted for the process heating load, in kg/h. b) Determine the power developed by the turbine, in kW. c) Determine the rate of heat transfer to the working fluid passing through the steam generator, in kJ/h
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