Chapter 9, Problem 9.6P

A 60,000 kw turbine in a reheat cycle steam at 15 MPa, 540˚C enters the engine and expands to 1.95 MPa and 260°C. It reenters the engine at 1.8 MPa and 540˚C. Expansion now occurs to the condenser pressure of 0.0035 MPa. The steam flow is 147,000 kg/hr, generator efficiency is 96%. For actual engine find combined thermal efficiency, combined steam rate, and combined engine efficiency.

A Steam power plant uses a Rankine cycle to produce electrical power. The boiler pressure is 2 MPa and the temperature at the turbine inlet is 300C. The pump inlet pressure is 0.025 MPa and the entropy is 0.8931 kJ/kg-k. The turbine gives 1MW of work to the generator. Find the dryness of the steam at turbine exit, Wp, Qa, Qr, Wt, Wnet, efficiency, SR, and mass flow rate of steam. (84.65%, 2.0143 kJ/kg, 2749.56 kJ/kg, 1986.15 kJ/kg, 765.42 kJ/kg, 763.41 kJ/kg, 27.76%, 4.7157 kg/kWh, 1.3064 kg/s) -Draw the T-S diagram with properly labelled points and solve the problems. Show your COMPLETE solution - Use the Steam Table provided if necessary.

A reheat steam cycle has 13500 kPa throttle pressure at the turbine inlet and 2800 kPa reheat pressure. The throttle and reheat temperature of the steam is 540°C. The condenser pressure is 3.4 kPa. Find the cycle thermal efficiency in %. Note: At 13.5 MPa, tsat 333.88 deg C, sf = 3.5921 kJ/kg-K, Sg = 5.4022 kJ/kg-K. If the steam table is needed, please use the green book entitled "Thermodynamics Properties of Water Including Vapor, Liquid, and Solid Phases" by Keenan, Keyes, Hill, and Moore.

I need some help with this problem, it seems that we only have the temperatures and we go from there. For the state 3 right before to enter the turbine it seems like the fluid is not superheated , why? Please work it out with clear step by step. Any help will be very appreciated

Give an Example of a problem on Actual Reheat rankine cycle with complete solution and compare it with a simple rankine cycle with the same given data.

In an ideal steam cycle, steam at (20 bar, 360 C°) is expanded in a turbine to (0.08 bar). It then enters a condenser where it is condensed to saturated liquid water. Then the 4- pump feeds back the water into the boiler. Find per kg of steam (a) Wnet (b) nth (c) if(nr = nP = 80%), find the percentage reduction in wnet andnth Ans. (a) 969.61 (kj/kg) (b) 32.5% (c) 20.1 % (d) 20.1 %

C. the steam fiow rate is plant. Kg/hr, find the net power output of the 3. Steam is supplied to a two-stage turbine at 170 bar and 600°C. It expands isentropic ally until it is zero percent moisture. Then it is reheated to 500°C at constant pressure and expanded in the second-stage turbine to the condenser pressure of 0.2 bar. If the isentropic efficiency of the second stage is 80%, calculate the specific steam consumption and thermal efficiency.

Steam enters the turbine at 10 MN/m2and 450oC. The steam expanded in the turbine down to the condenser pressure of 20 kN/m2. The condensate leaving the condenser is pumped to the boiler pressure directly. The turbine has an isentropic efficiency of 89%, and the mass of steam generated in the boiler is 5 kg/s. Find: Cycle thermal efficiency. Plant power output.Neglect the pump work and draw the cycle on a T – s diagram. Hint: 1 MN/m2= 10 bar

In a geothermal power plant a underground hot water is available as saturated liquid at 600 kPa. The flashed steam enters a turbine at 529 kPa, 98 % quality and expands to 15 kPa, when it is condensed. The flow rate from the well is 28.9kg/s. The efficiency is 90%. What is the power produced by the plant in KW.