2. (#6-DimagPP18) A reheat regenerative steam cycle operates with condenser pressure of 0.007 MPa. Steam at 13.5 MPa and 540 C leaves the steam generator and enters the turbine at 13 MPa and 540 ■C. Expansion takes place in the turbine to a pressure of 3.45 MPa and a temperature of 350 C. At this condition, the steam is re-heated at constant pressure to a temperature of 480 C. The reheated steam expands to 0.70 MPa and 260 C where a portion of steam is extracted to an open feedwater heater. The remaining steam continues to expand to an exhaust pressure of 0.007 MPa and a quality of 88%. Neglecting the effect of pump work, determine: a) QA b) Work of the turbine c) The thermal efficiency of the engine

2. (#6-DimagPP18) A reheat regenerative steam cycle operates with condenser pressure of 0.007 MPa. Steam at 13.5 MPa and 540 C leaves the steam generator and enters the turbine at 13 MPa and 540 ■C. Expansion takes place in the turbine to a pressure of 3.45 MPa and a temperature of 350 C. At this condition, the steam is re-heated at constant pressure to a temperature of 480 C. The reheated steam expands to 0.70 MPa and 260 C where a portion of steam is extracted to an open feedwater heater. The remaining steam continues to expand to an exhaust pressure of 0.007 MPa and a quality of 88%. Neglecting the effect of pump work, determine: a) QA b) Work of the turbine c) The thermal efficiency of the engine

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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A steam power plant operates on a Rankine cycle and has an open feedwater heater. Heat is rejected in the condenser at 30kPa, while the boiler has a pressure of 8MPA. Some of the steam is extracted mi- expansion at 0.4MPA to heat the open feedwater heater. The turbine inlet temperature is 480°C. First draw the T-s diagram for this cycle. Use the number convention from the device diagram below and label all work and heat flows. Then, determine the net work per kilogram of steam and the cycle's thermal efficiency. Wr TURBINE OPEN FEEDWATER HEATER COND.
Required information. The net work output and the thermal efficiency for the Carnot and the simple ideal Rankine cycles with steam as the working fluid are to be calculated and compared. Steam enters the turbine in both cases at 10 MPa as a saturated vapor, and the condenser pressure is 50 kPa. In the Rankine cycle, the condenser exit state is saturated liquid and, in the Carnot cycle, the boiler inlet state is saturated liquid. Draw the T-s diagrams for both cycles. (Please upload your response/solution using the controls below.) upload a response file (15MB max) Choose File no file selected save
4) In a reheat Rankine cycle, water vapor enters the high-pressure turbine at 9MPa and 450°C. It is expanded to an intermediate pressure of 0.8MPa and enters the low-pressure turbine with a temperature of 400°C. Condenser pressure is 7.5kPa and water enters the pump as a saturated liquid. There is no pressure loss in the piping that connects the cycle components. Water mass flow rate is 60 kg/s and both turbines have an isentropic efficiency of 90%. Calculate mankan kunne tħe b) net power output, in MW
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2. A Rankine cycle is characterized by turbine inlet conditions of 10 MPa and 500°C. The condenser pressure is 6 kPa. The heat transfer to the steam in the boiler occurs at the rate of 7.0 X 100 kW. The cooling water in the condenser increases in temperature from 20⁰ to 30°C. Determine (a) the net power produced; (b) the cooling-water flow rate in kg/s; (c) the cycle thermal efficiency.
Thermal engineering
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5. Consider a steam power plant operating on the ideal Rankine cycle. The steam enters the turbine at 5 MPa, 350 °C and is condensed in the condenser at a pressure of 15 kPa. Determine the thermal efficiency of the cycle if the steam were superheated to 750 °C. Draw the schematic and Ts diagram.
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