A turbine receives steam at the following state: pressure 1200 kPag, enthalpy 2875 kJ/kg, speed 33.3 m/s and elevation 30 m. The steam leaves the turbine at the following state; pressure 20 kPag, enthalpy 2152 kJ/kg, speed 100 m/s and elevation 0 m. Heat is lost to the surroundings at the rate of 29 kJ/s. if the rate of steam flow through the turbine is 0.24 kg/s, what is the power output of the turbine in kW? Assume steady flow conditions. O 598.01 O 112.52 O 143.52 O 165.56
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- Steam enters a turbine at 15bar and 600°C with a rate of 0.371 kg/s. The steam expands to 0.08 bar with quality at 90%. Stray heat transfer and kinetic and potential energy effects are negligible. For operation at steady state, • the volume flowrate at the turbine outlet is m³/s, ⚫the power developed by the turbine is ⚫and the temperature at the turbine exit is kW, °C.Water from a large tank enters into a pipe and discharges to the atmosphere through a nozzle connected at the other end of the pipe. The tip of the nozzle is located 240 m below the water surface in the reservoir. The jet formed at the tip of the nozzle has a diameter of 100 mm and velocity of 60 m/s. Neglecting minor losses, a) Compute the power produced by the jet in hpb) compute the power lost due to friction in the pipeWater is the working fluid in an ideal regenerative Rankine cycle with one open feedwater heater. Steam enters the turbine at 1400 lbf/in.² and 1000°F and expands to 120 lbf/in.2, where some of the steam is extracted and diverted to the open feedwater heater operating at 120 lbf/in.2 The remaining steam expands through the second-stage turbine to the condenser pressure of 2 lbf/in.² Saturated liquid exits the open feedwater heater at 120 lbf/in.² The net power output of the cycle is 1 x 10³ Btu/h. Determine for the cycle: (a) the mass flow rate of steam entering the first stage of the turbine, in lb/h. (b) the rate of heat transfer, in Btu/h, to the working fluid passing through the steam generator. (c) the percent thermal efficiency.
- A steam turbine is to operate on a simple regenerative cycle. Steam is supplied dry saturated at 40 bar, and is exhausted to a condenser at 0.07 bar. The condensate is pumped to a pressure of 3.5 bar at which it is mixed with bleed steam from the turbine at 3.5 bar. The resulting water which is at saturation temperature is then pumped to the boiler. For the ideal cycle sketch the process on the T-s diagram and calculate, neglecting feed pump work,The amount of bleed steam required per kg of supply steamThe thermal efficiency of the plantThe specific steam consumptionproblem 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 High-P turbine Low-P turbine Reheater Boiler Condenser 2 PumpA steam power plant operates on the ideal Rankine cycle. The steam enters the turbine at 7 MPa and 550°C. It discharges to the condenser at 20 kPa. Determine a.) The heat transfer to the water in the steam generator in kJ/kg, b.) The net cycle work in kJ/kg, c.) The cycle thermal efficiency in %.
- The inlet and exit temperatures of the air expanded at an adiabatic turbine are 50 Cand -30 C, respctively, while operating at a plant. The air enters the turbine with a volumetric flow rate of 25 L/s and at 450 kPa. Assume air behaves as an ideal gas with constant specific heats. Calculate the turbine power output (kW) at isentropic conditions if the turbine operates at isentropic efficiency of 75%?(5 points) It is proposed to build a 1000 MWelectric power plant with steam as the working fluid. The condensers are to be cooled with river water. The maximum steam temperature is 550-C, and the pressure in the condensers will be 10 kPa. Estimate the temperature rise of the river downstream from the power plant. A. AT = 4.9 deg C Power B. AT = 3.9 deg c plant C. AT = 2.9 deg C D. AT = 1.9 deg C Discharge Intake 60 m 8 m deep River mean speed 10m/minutecompressing it isothermally. Determine the required change in pressure. 2-45 Saturated refrigerant-134a liquid at 10°C is cooled to 0°C at constant pressure. Using coefficient of volume expan- sion data, determine the change in the density of the refrigerant.
- Oil with sp. gr. of 0.87 is being pumped from a lower reservoir to an elevated tank as shown. The pump in the system is 78% efficient and is rated 185 kW. Determine the energy added by the pump. 160mm w EL. 200m 200mm 9 El.150m Oif. Sp.gr.=(0.82HMW-1 Regenerative steam power plant shown in figure below employs two feed heaters which are optimally placed such that cycle has the maximum thermal efficiency. The mass of steam generated is 16 kg/s. The feed water leaves each heater as saturated liquid at corresponding bleed pressure. Neglect the pumps work and find: a. Cycle thermal efficiency. b. Specific steam consumption. c. Mechanical efficiency of the turbine-generator gearing unit. Draw the equivalent (T-s) diagram considering an ideal cycle. 70 bar 450°C Gearing unit Generator 15 MW Turbine Super heater Boiler Condenser 0.07 bar Оpen heater Closed heater Pump Pump Throttling ValveOil with sp. gr. of 0.87 is being pumped from a lower reservoir to an elevated tank as shown. The pump in the system is 78% efficient and is rated 185 kW. Determine the energy added by the pump. 160mm » 200mm EL.200m W.S. El.150m Oif. Sp.gr.=0,82