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

Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter45: Domestic Refrigerators And Freezers
Section: Chapter Questions
Problem 9RQ: The defrost cycle in a domestic refrigerator may be terminated by two methods: ___and___.
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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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