A cogeneration system works with a water cycle and a refrigerant (ammonia) cycle combined. Superheated water vapor enters turbine 1 (efficiency of 85%) at a flow rate of 5 kg/sec, 50 bar and 500oC and expands to 1.5 bar. Half of the flow is extracted for industrial heating and the rest enters a heat exchanger. The condensate leaves the heat exchanger as saturated liquid at 1 bar and combines with the return flow from the industrial process, which comes back at 60oC and 1 bar. The combined flow is pumped (efficiency of 85%) to the boiler pressure. The refrigerant cycle is an ideal Rankine cycle. The ammonia enters turbine 2 at a pressure of 14 bar and a temperature of 100oC and leaves the condenser at 3 bar. Calculate: a) The amount of heat required by the boiler, in kW. b) The net power output of the cogeneration system, in kW. c) The heat transfer provided to the industrial process
A cogeneration system works with a water cycle and a refrigerant (ammonia) cycle combined. Superheated water vapor enters turbine 1 (efficiency of 85%) at a flow rate of 5 kg/sec, 50 bar and 500oC and expands to 1.5 bar. Half of the flow is extracted for industrial heating and the rest enters a heat exchanger. The condensate leaves the heat exchanger as saturated liquid at 1 bar and combines with the return flow from the industrial process, which comes back at 60oC and 1 bar. The combined flow is pumped (efficiency of 85%) to the boiler pressure. The refrigerant cycle is an ideal Rankine cycle. The ammonia enters turbine 2 at a pressure of 14 bar and a temperature of 100oC and leaves the condenser at 3 bar. Calculate:
a) The amount of heat required by the boiler, in kW. b) The net power output of the cogeneration system, in kW. c) The heat transfer provided to the industrial process
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