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- Consider a steam power plant, which can be modeled using the ideal reheat Rankine cycle. The steam entering the high- pressure turbine is at 6 MPa and 400 degrees C and leaves at 2 MPa. The steam is then reheated to 400 C at constant pressure, before it expands to 20 kPa in the low-pressure turbine. Calculate: (a) the turbine work output in kJ/kg (b) the thermal efficiency of the cycleA 286-MW steam power plant operates on the Rankine cycle but with turbine and pump efficiencies of 90%. The steam enters the turbine at 10,000 kPa and 550°C. It discharges to the condenser at 50 kPa. Determine the mass fraction of steam that condenses at the turbine exit in percent.problem 5.3 Consider a steam power plant that operates on the ideal reheat Rankine cycle. The plant maintains the boiler at 5000 kPa, the reheat section at 1200 kPa, and the condenser at 20 kPa. The mixture quality at the exit of both turbines is 96 percent. Determine the temperature at the inlet of each turbine and the cycle's thermal efficiency. Answers: 327°C, 481°C, 35.0 percent
- A 272-MW steam power plant operates on the Rankine cycle but with turbine and pump efficiencies of 90%. The steam enters the turbine at 10,000 kPa and 550°C. It discharges to the condenser at 50 kPa. Determine the mass flow rate in kg/s.?(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; ii. the net power output and thermal efficiency(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;
- In a reheat cycle steam at 15 MPa, 540°C enters the engine and expands to 1.95 MPa. At this point the steam is withdrawn and passed through a reheater. It reenters the engineat 540°C. Expansion now occurs to the condenser pressure of 0.0035 MPa. (a) A 60,000 kw turbine operates between the same state points except that the steam enters the reheater at 1.95 MPa and 260°C, departs at 1.8 MPa and 540°C. The steam flow is 147,000 kg/hr, generator efficiency is 96%. For actual engine, find, ek, mk, and nk, (b) Determine the approximate enthalpy of the exhaust steam if the heat lost through the turbine casing is 2% of the combined work.Steam enters the turbine of a power plant operating on the Rankine cycle at 3300 kPa and exhausts at 50 kPa. To show the effect of superheating on the performance of the cycle, calculate the thermal efficiency of the cycle and the quality of the exhaust steam from the turbine for turbine-inlet steam temperatures of 450, 500, 5500C.Q3) A steam power plant operates on a simple ideal Rankine cycle between the pressures limits of 8000 kPa and 10 kPa. The mass flow rate of steam through the cycle is 25 kg/s. The temperature of steam at the turbine inlet is 400 C. Show the cycle on a block diagram and on a T-S diagram with respect to saturation lines. Calculate: a- The rate of heat input in the boiler and the rate of heat output in the condenser. b-The thermal efficiency of the turbine.
- Q2: Consider a steam power plant that operates on a simple Rankine cycle and has a net power output of 45 MW. Steam enters the turbine at 7 MPa and 500°C and is cooled in the condenser at a pressure of 10 kPa by running cooling water from a lake through the tubes of the condenser at a rate of 2000 kg/s. assuming an isentropic efficiency of 87 percent for both the turbine and the pump. Show the cycle on a T-s diagram with respect to saturation lines, and determine (a) the thermal efficiency of the cycle, (b) the mass flow rate of the steam, and (c) the temperature rise of the cooling water.A steam power plant operates on the basis of Rankine cycle between the pressure limits of 10 MPa in the boiler and 15 kPa in the condenser. The turbine inlet temperature is 4250C. The turbine isentropic efficiency is 90 percent, the pump losses are negligible, and the cycle is sized to produce 2500 kW of power. (a) Calculate the mass flow rate through the boiler, the power produced by the turbine, the rate of heat supply in the boiler, and the thermal efficiency (b) How much error is caused in the thermal efficiency if the power required by the pump were completely neglected? c) fill the table stream 1 2 3 state T(C) P(kPa) H(kj/kg)A 330 MW steam power plant operates according to the simple ideal Rankine cycle. Water vaporenters the turbine at 10 MPa pressure and 525 ° C temperature and 15 kPa condenser pressureIt is expanding. A T-s with cycle, saturated liquid and saturated steam curvesshow in the diagram and (a) the degree of dryness of the steam at the turbine outlet, (b) the thermal efficiency of the cycle,(c) calculate the mass flow of water vapor circulating in the cycle