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- A turbine is driven by a system that enters the turbine at the ff. conditions: 500 kg/h, 44 atm, 450 deg C, 60 m/s linear speed. The steam exits at a point five meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 360 m/s speed. 70,000 W of shaft work is delivered by the turbine while 104 kilocalories/h heat is lost. Here are the questions to be answered: 1. Why is the value of Wexp 0? (Explain) 2. Given the above values, can you calculate the Wflow? (Yes/No)Water enters a turbine pump at 30kPa (vf= 0.0010223 cu. m per kg) and discharges at 2.8 MPa. The turbine work is 380 kJ/kg. What is the percentage of turbine work output required to operate the pump of a steam power plant? 0.75% ANSWERA trial run on a steam turbine power plant gave the following resultsEntrance to boiler Exit of turbineMass flow rate =3600 kg/h Velocity of steam=25 m/sEnthalpy of water=850 kJ/kg Elevation above datum=0Elevation above datum=4.3 m Enthalpy of steam=2625 kJ/kgVelocity of water=5 m/sDetermine the power developed by the turbine if the heat added in the boiler is 2100 kJ/s.
- 31 - The temperature of the water vapor at the entrance to a turbine is 400ºC and the pressure is 4.5 MPa. The pressure of the saturated steam water at the turbine exit is 75 kPa and the mass flow rate is 41 kg/s. What is the turbine power? a) 21.69 MW B) 15.52 MW NS) 24.55 MW D) 18.96 MW TO) 22.28 MWAn air compressor with a clearance of 4% compresses 14.73 cubic meter/min of air from 97 kpa, 27°C to 462 kpa.If the overail adiabatic efficiency is 61%, determine the indicated horse- power of the directly connected driving steam engineAt a particular stage of a reaction turbine the mean blade speed is 140 m/sec and the steam is at a pressure of 20 bar with temperature of 250° C. Fixed and moving blades at this stage have inlet angles 30° and exit angles 20°. The stage efficiency is 80%. Determine (1) Specific entholpy drop across the stage in kJ/kg. (i) Drum Dia and blade height if heigh is one-twelfth of the drum dia. and the steam flow is 120 kg/sec. (ii) The percentage increase in the relative velocity across the bladings as a result of pressure drop across the blading.
- Steam at 200 psia and 600°F (state 1) enters a turbine through a standard 3-in pipeline with a velocity of 10 ft/s. The exhaust from the turbine is carried through a standard 10-in pipeline and is at 4 psia and 160°F(state 2). Data: H1=1321.4 BTU/lb, V1= 3.059 ft³/lb, H2=1129.3 BTU/lb, V2=92.15 ft³/lb. What is the power output of the turbine in W, assuming no heat losses.A. 29989.2B. 32152.6C. 34017.6D. 35435.0A single-acting, single-cylinder air compressor is rated at 4.25 m3/min of air. The suction conditions are 1 atm and 27 C and discharge pressure is 1034 kPa. The compression process follows the equation PV1.35 = A. Determine the power, in kW, required to compress the air. B.)what is the engine kW power needed to drive the unit if the combined engine-compressor efficiency is 84%? C.)if the compressor is to run two-stage at optimum intercooler pressure with perfect intercooling, what will be percentage of power saved?Water enters the pump of a steam power plant at 15 kPa and 50°C at a rate of 0.15 m3 /s. The diameter of the pipe at the pump inlet is 0.25 m. What is the net positive suction head (NPSH) at the pump inlet? (a) 1.70 m (b) 1.49 m (c) 1.26 m (d) 0.893 m (e) 0.746 m
- A turbine is driven by a system that enters the turbine at the ff. conditions: 500 kg/h, 44 atm, 450 deg C, 60 m/s linear speed. The steam exits at a point five meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 360 m/s speed. 70,000 W of shaft work is delivered by the turbine while 104 kilocalories/h heat is lost. Why is expansion work 0 and why cannot the flow work be calculated?In a reaction turbine, the drum diameter is 2.15 m, speed of turbine is 750 rev/min and the steam flow is 14.2 kg/sec. At a particular ring of blades, the blade height is 15.875 cm and the discharge angle (α & ϕ) is 25°. Here, the pressure of steam is 0.04 N/mm2 abs, and its dryness fraction is 0.97. Determine the following: 1.Heat drop, in kJ, through this turbine pair, assuming turbine efficiency of 80% a. 141.6 b. 77.14 c. 12.47 d. 22.89 e. 42.02A turbine is driven by a system that enters the turbine at the ff. conditions: 200 kg/h, 39 atm, 501 deg C, 49 m/s linear speed. The steam exits at a point 8 meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 290 m/s speed. 69000 W of shft work is delivered by the turbine while 100 kcal/h heat is lost. What is the value of (a) expansion work and (b) flow work? If the value is zero, explain why is it so.If it cannot be calculated, explain why.