Chapter 9, Problem 9.93P

A power plant operating in a Reheat Rankine Cycle produces steam at 3 MPa, 600oC in the boiler. It keeps the condenser at 45oC by transfer of 10 MW out as heat transfer. The first turbine section (high-pressure) expands to 500 kPa and then flow is reheated followed by the expansion in the low-pressure turbine. Provide a detailed solution. Avoid shortcuts. Show how much is the net power output (kW)

Carnot cycle operates between 30°C and 350°C. Find the cycle efficiency.

a boiler operates at 1.24 mpa and delivers dry at saturated steam which is expanded to 100 kpa atmospheric pressure in a steam engine having a steam rate of 12 kg/hp-hr.temperature of feed water is 93 degrees celsius. find the rankine vapor cycle 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.

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 %

Cogeneration is often used where a steam supply is needed for industrial process energy. Assume a supply of 5 kg/s steam at 0.5 MPa is needed. Rather than generating this from a pump and boiler, the setup in below. is used so the supply is extracted from the high-pressure turbine. Find the power the turbine now cogenerates in this process. 2 3 HP LP

PLEASE SHOW COMPLETE SOLUTION (DRAW THE TS DIAGRAM)

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

Open feed water heater in the power plant operating according to the Rankine cycle with ideal intermediate steam is used. Turbine inlet state is 10MPa 650C. Condenser pressure is 10 kPa. Intermediate steam taking takes place at a pressure of 2 MPa. The intermediate steam mass flow rate depends on the total mass flow. Find the ratio. Find the thermal efficiency. TIP: Treat the mass flow entering the turbine by saying 1, and r for the intermediate steam. Result: r = 0.239, yield 45.2%