3. Consider a steam power plant that operates on the ideal regenerative Rankine cycle with an open feedwater heater. The plant maintains the turbine inlet at 3000 kPa and 350°C; and operates the condenser at 20 kPa. Steam is extracted at 1000 kPa to serve the open feedwater heater. Calculate the work produced by the turbine, the work consumed by the pump, and the heat supply in the boiler for this cycle per unit of boiler flow rate.

3. Consider a steam power plant that operates on the ideal regenerative Rankine cycle with an open feedwater heater. The plant maintains the turbine inlet at 3000 kPa and 350°C; and operates the condenser at 20 kPa. Steam is extracted at 1000 kPa to serve the open feedwater heater. Calculate the work produced by the turbine, the work consumed by the pump, and the heat supply in the boiler for this cycle per unit of boiler flow rate.

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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An ideal Rankine cycle operates between a steam boiler pressure of 18 MPa and a condenser temperature of 42 °C. The steam leaving the boiler is a saturated vapor. The net power generated by the cycle is 150 MW. What is the mass flow rate of steam? What is the cycle efficiency? Use the formula: n=Wnet/Qin.
A simple ideal Rankine cycle which uses water as the working fluid operates its condenser at 40C and its boiler at 300C. The steam enters the turbine without any superheating. Determine the specific enthalpy (kJ/kg) at the turbine outlet. (Use 2 decimal places for the final answer.)
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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 pump efficiency on the overall thermal efficiency of the thermodynamics cycle (Hint: You will assume different values for the isentropic pump 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.
3) An ideal Rankine cycle with superheat and reheat has steam entering the turbine at 10 MPa and 440 °C. The steam is extracted and sent to the reheater at a pressure of 1.5 MPa, and returns to the turbine at 440 °C. The condenser pressure is 20 kPa. The cycle produces 400 MW of net power. Determine (a) the qualities of steam at (i) high pressure turbine exit, and (ii) low pressure turbine exit (b) the thermal efficiency, in % (c) the rate of heat transfer, into the working fluid as it passes through the boiler, in MW (d) the rate of heat transfer, from the condensing steam as it passes through the condenser, in MW (e) the mass flow rate of the condenser cooling water, in kg/ h, if cooling water enters the condenser at 12 Cand exits at 37 C
A steam power plant operating in a Rankine cycle has saturated yapor at 4.0 MPa leaving the boiler. The turbine exhausts to the condenser, operating at 75 kPa, and the mass flow rate of the working fluid is 5.0 kg/hr. The turbine efficiency is 0.85. Solve for the work produced by the turbine and the pump (in Watts), the heat transfer in the boiler (in Watts), and the Rankine cycle efficiency.