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.
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- 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 consumption:A rigid tank contains 5 kg of saturated vapor steam at 100°C. The steam is cooled to the ambient temperature of 25°C. a) Determine the entropy change of the steam, in KJ/K b) For the steam and its surrounding, determine the total entropy change associated with this process, in KJ/K.The disinfection of water is carried out in a stirred tank. The treatment process has water as the input at a rate of 48, 000 L/h. The tank carries 3500 L of water at all times. Sufficient chlorine is fed to the water. The rate of disinfection can be described as a first-order reaction with a rate constant of 0.25/min. The efficiency of the system can be expected to be (A) 0.22 (B) 0.32 (C) 0.42 (D) 0.52
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- Water is the working fluid in a Rankine cycle. Steam exits the steam generator at 1500 lbf/in.2 and 1100°F. Due to heat transfer and frictional effects in the line connecting the steam generator and turbine, the pressure and temperature at the turbine inlet are reduced to 1400 lbf/in.2 and 1000°F, respectively. Both the turbine and pump have isentropic efficiencies of 90%. Pressure at the condenser inlet is 2 lbf/ in.2, but due to frictional effects the condensate exits the condenser at a pressure of 1.5 lbf/in.2 and a temperature of 110°F. The condensate is pumped to 1600 lbf/in.2 before entering the steam generator. The net power output of the cycle is 1 x 108 Btu/h. Cooling water experiences a temperature increase from 60°F to 76°F, with negligible pressure drop, as it passes through the condenser.Determine for the cycle:(a) the mass flow rate of steam, 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…for an impulse turbine of de laval type, the nozzle having an angle of 16 degree ,deliver 1 kg of steam per second at a speed of 720 m/s to a set of blades moving at 180 m/s.the blade angle at outlet is 25 degree and blade velocity coefficient is 0.72. determine: 1. Power of the wheel in kilowatt. 2. Blade efficiency in Percentile (%) 3. The energy lost in the blades in kJ/kg.HMW-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 Valve
- A well-insulated turbine operating at steady state is shown on the right. Steam enters at 3 MPa, 400°C, with a volumetric flow rate of 85 m³/min. Some steam is extracted from the turbine at a pressure of 0.5 MPa and a temperature of 180°C. The rest expands to a pressure of 6 kPa and a quality of 90%. The total power developed by the turbine is 11,400 kW. Kinetic and potential energy effects can be neglected. Determine (a) the mass flow rate (in kg/s) at each exit, and (b) the diameter of the duct, d₂ (in cm) where steam is extracted P₁ = 3MPa T₁=400°C (AV)₁ = 85 m³/min Turbine P2 = 0.5 MPa T₂ = 180°C V₂= 20 m/s Power out ¹3 P3= 6 kPa x3 = 90%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 165.560.05 kg of steam at 1.5 MPa is contained in a rigid vessel of volume of 0.0076 m^3. A. What is the temperature of the steam? B. If the vessel is cooled, at what temperature will the steam be just dry and saturated? C. Cooling is continued until the pressure in the vessel is 1.1 MPa, calculate the amount of vapor at this point. D. Calculate the amount of heat rejected between the initial and the final state. E. Draw the Ts diagram of the whole process.