A steam power plant operates on the ideal Rankine cycle. The steam enters the turbine at 7.0 MPa and 550°C. Seam eneror Turbine 7 MP Condenser 8- Pump 20 P Boundary It discharges to the condenser at 20 kPa. Let the steam flow rate be 5 kg/s. The steam receives heat from the combustion gases in the furnace of the steam generator; assume the combustion gases change temperature from 2000 K to 425 K in flowing through the steam generator. The cooling water enters the condenser at 20°C and leaves at 40°C. T, is also 20°C. Determine (a) the cycle thermal efficiency, and (b) the cycle irreversibility. Hint: Heating of the steam in the steam generator from state 1 to state 2 occurs at constant pressure; hence the process is internally reversible, but there is a temperature difference between the water in the steam generator and the combustion gas in the furnace, so there are external irreversibilities associated with the process. In the condensation of steam in the condenser from state 3 to state 4 heat transfers to the surroundings and there is a temperature difference between the system and the surroundings; hence the process is externally irreversible.

A steam power plant operates on the ideal Rankine cycle. The steam enters the turbine at 7.0 MPa and 550°C. Seam eneror Turbine 7 MP Condenser 8- Pump 20 P Boundary It discharges to the condenser at 20 kPa. Let the steam flow rate be 5 kg/s. The steam receives heat from the combustion gases in the furnace of the steam generator; assume the combustion gases change temperature from 2000 K to 425 K in flowing through the steam generator. The cooling water enters the condenser at 20°C and leaves at 40°C. T, is also 20°C. Determine (a) the cycle thermal efficiency, and (b) the cycle irreversibility. Hint: Heating of the steam in the steam generator from state 1 to state 2 occurs at constant pressure; hence the process is internally reversible, but there is a temperature difference between the water in the steam generator and the combustion gas in the furnace, so there are external irreversibilities associated with the process. In the condensation of steam in the condenser from state 3 to state 4 heat transfers to the surroundings and there is a temperature difference between the system and the surroundings; hence the process is externally irreversible.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Question

100%

A steam power plant operates on the ideal Rankine cycle. The steam enters the
turbine at 7.0 MPa and 550°C.
550C
Steam
generator
Turhine
7 MPa
Condenser
Pump
20 P
Boundary
It discharges to the condenser at 20 kPa. Let the steam flow rate be 5 kg/s. The steam receives heat
from the combustion gases in the furnace of the steam generator; assume the combustion gases
change temperature from 2000 K to 425 K in flowing through the steam generator. The cooling
water enters the condenser at 20°C and leaves at 40°C. T, is also 20°C. Determine (a) the cycle
thermal efficiency, and (b) the cycle irreversibility.
Hint: Heating of the steam in the steam generator from state 1 to state 2 occurs at constant pressure;
hence the process is internally reversible, but there is a temperature difference between the water in
the steam generator and the combustion gas in the furnace, so there are external irreversibilities
associated with the process.
In the condensation of steam in the condenser from state 3 to state 4 heat transfers to the
surroundings and there is a temperature difference between the system and the surroundings; hence
the process is externally irreversible.

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