(b) A steam power plant operates on an ideal reheat Rankine cycle between the pressure limits of 6 MPa and 20 kPa. Steam enters the high pressure turbine at 6 MPa and leaves at 2 MPa. Steam is then reheated at constant pressure to same temperature. Heat is transferred to the steam in the boiler at a rate of 58,416 kJ/s. And the mass flow rate of steam through the cycle is 20 kg/s. The moisture content of the steam at the exit of the low-pressure turbine is not to exceed 8 per cent. Steam is cooled in the condenser by the cooling water from a nearby river, and the temperature rise is 12°C. Show the cycle on a T-s diagram with respect to saturation lines, and determine; i. the turbine inlet temperature;

(b) A steam power plant operates on an ideal reheat Rankine cycle between the pressure limits of 6 MPa and 20 kPa. Steam enters the high pressure turbine at 6 MPa and leaves at 2 MPa. Steam is then reheated at constant pressure to same temperature. Heat is transferred to the steam in the boiler at a rate of 58,416 kJ/s. And the mass flow rate of steam through the cycle is 20 kg/s. The moisture content of the steam at the exit of the low-pressure turbine is not to exceed 8 per cent. Steam is cooled in the condenser by the cooling water from a nearby river, and the temperature rise is 12°C. Show the cycle on a T-s diagram with respect to saturation lines, and determine; i. the turbine inlet temperature;

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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Question

(b)
A steam power plant operates on an ideal reheat Rankine cycle between the pressure limits of 6 MPa and 20 kPa. Steam
enters the high pressure turbine at 6 MPa and leaves at 2 MPa. Steam is then reheated at constant pressure to same
temperature. Heat is transferred to the steam in the boiler at a rate of 58,416 kJ/s. And the mass flow rate of steam through the
cycle is 20 kg/s. The moisture content of the steam at the exit of the low-pressure turbine is not to exceed 8 per cent. Steam is
cooled in the condenser by the cooling water from a nearby river, and the temperature rise is 12°C. Show the cycle on a T-s
diagram with respect to saturation lines, and determine;
i. the turbine inlet temperature;

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12 Th 04 A- A steam power plant operates on a simple ideal Rankine cycle The steam enters the turbine at pressure of 5 MPa and leaves at 10 kPa and 90% quality. The mass flow rate of steam through the cycle is 35 kg/s. Show the cycle on a T-s diagram and determine (a) the thermal efficiency of the cycle and (b) the net power output of the power plant.
A reheat regenerative steam power cycle, high-pressure turbine receives superheated steam at 6 MPa and 450°C, and exhausted to the reheater at 2 MPa. The reheated steam enters the low-pressure turbine at 2MPa and exits to condenser at 0.01 MPa with entropy of 7.129 kJ/kq.K. Steam extracted to an open FWH at 3 MPa, and to a closed FWH at 1 MPa. The condensate from the closed FWH pumped to the open FWH. Determine the thermal efficiency of the cycle and the temperature of the reheated steam entering the low-pressure * turbine
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2. Steam enters the turbine of an ideal Rankine cycle at 8 MPa and expands adiabatically to 10 kPa. If the moisture content of the steam at the turbine exit is not to exceed 0.1, calculate the thermal efficiency of the cycle.
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Scenario (1) The first steam power plant operates on an ideal reheat Rankine cycle. Steam enters the first turbine at 8 MPa and 500 C and leaves at 3 MPa. Steam is then reheated at a constant pressure to 500 C before it expands to 20 kPa in the low-pressure turbine. Assuming that heat is being added to the boiler from a high temperature source at 1800 K and the condenser is transferring heat to a temperature sink at 300 K. Task 1 Investigate the effect of changing turbine efficiency on the overall thermal efficiency of the thermodynamic cycle. (Hint: You will assume different values for the isentropic turbine efficiency such as: 70%, 80%, 90%, 95%, and 100%, then observe how it will change the thermal efficiency of the cycle). Representing the results in a plot is recommended.
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