There is water as a working fluid in a cogeneration cycle that generates electricity and provides heating to a housing estate. From the steam generator there is an output at 2 MPa and 320 °C with a mass flow of 0.82 kg/s, which expands in a two-stage turbine. Between the two stages, a fraction of the steam of 0.141 to 0.15 MPa is extracted, with which supplies heat to a building, and the remainder of the steam expands in the second stage to the condenser pressure of 0.06 bar. The condensate that returns from the heating is at 0.1 MPa and 60 °C, and is taken to the condenser through a valve, where it mixes with the flow main feed water. Saturated liquid leaves the condenser at 0.06 bar. Each The turbine stage has an isentropic efficiency of 80% and the pumping process a 75% yield, determine the following: a) Draw the DFP diagram of the cycle. b) Draw a schematic of the T-s diagram of the cycle. c) Thermodynamically characterize the cycle, quantifying the properties for each current: T [°C], P [kPa], h [kJ/kg], s [kJ/kg K], ?̂ [m3/kg], a [kJ/kg] and phase. Consider T0= 300 K and Po= 100kPa d). List of jobs. e) Thermal performance. f) Exergetic efficiency. g) The exergy destroyed in the turbine and in the industrial process, in [kW].

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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There is water as a working fluid in a cogeneration cycle that generates electricity and provides heating to a housing estate. From the steam generator there is an output at 2 MPa and 320 °C with a mass flow of 0.82 kg/s, which expands in a two-stage turbine. Between the two stages, a fraction of the steam of 0.141 to 0.15 MPa is extracted, with which supplies heat to a building, and the remainder of the steam expands in the second stage to the condenser pressure of 0.06 bar. The condensate that returns from the heating is at 0.1 MPa and 60 °C, and is taken to the condenser through a valve, where it mixes with the flow main feed water. Saturated liquid leaves the condenser at 0.06 bar. Each The turbine stage has an isentropic efficiency of 80% and the pumping process a 75% yield, determine the following: a) Draw the DFP diagram of the cycle. b) Draw a schematic of the T-s diagram of the cycle. c) Thermodynamically characterize the cycle, quantifying the properties for each current: T [°C], P [kPa], h [kJ/kg], s [kJ/kg K], ?̂ [m3/kg], a [kJ/kg] and phase. Consider T0= 300 K and Po= 100kPa d). List of jobs. e) Thermal performance. f) Exergetic efficiency. g) The exergy destroyed in the turbine and in the industrial process, in [kW].

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