Problem 3 Steam flows steadily into a turbine with a mass flow rate of 30 kg/s and a negligible velocity at 10 MPa and 700°C. The steam leaves the turbine at 0.8 MPa and 250°C with a velocity of 210 m/s. The rate of work done by the steam in the turbine is measured to be 26 MW. If the elevation change between the turbine inlet and exit is negligible, determine the rate of heat transfer associated with this process. m = 30 kg/s V₁~0m/s P₁ = 10 MPa T₁-700°C Qout Steam turbine V₂-210 m/s P=0.8 MPa T₂=250°C Wout -26 MW
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- 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%?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 165.56A pump is attached to a fire hydrant to produce a jet that rises to a minimum height of 13.5 m at a rate of 20 L/s. The pressure is estimated as 100 kPa at the attachment. The hose attached to the pump is 75 mm in diameter and 1.5 m long with a discharge nozzle at the end. The nozzle is inclined at an angle of 50 degrees to the horizontal. The pump has an efficiency of 80%. Neglect friction. Jet 13.5 m 14.0 Determine the minimum power that the pump can supply. a.) 2793 W b.) 3298 W 15.0 Determine the minimum rated power of the pump. c.) 3088 W e.) d.) 2882 W a.) 3860 W c.) 3492 W e.). b.) 3603 W d.) 4123 W
- 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 pipePls solv fast and correctWater is pumped from a large reservoir to a storage tank 30m above via a constant diameter pipe. The volumetric flow rate during pumping is 55 L/s. This is found to require 25kW of electrical power input to the motor driving the pump. The top of the storage tank is open to the atmosphere. The water density, p=1000kg/m³, and the absolute viscosity, u=1mPa.s. Determine: a) The overall efficiency of the pump-motor unit if all frictional losses in the pipes are neglected. b) The pressure difference between the inlet and the exit of the pump for the same case as part a). c) Frictional losses in the pipe are found to be significant. If the length of pipe between the pump and the storage tank is 130m, the pipe diameter is 20cm, and the surface roughness is 0.4mm, determine a more accurate estimate for the overall efficiency of the pump-motor unit. Minor losses can be neglected.
- A turbine discharges 200 kg/h of saturated steam at 10.0 bar absolute. It is desired to generate steam at 250°C and 10.0 bar by mixing the turbine discharge with a second stream of superheated steam of 300°C and 10.0 bar.(a) If 300 kg/h of the product steam is to be generated, how much heat must be added to the mixer?(b) If instead the mixing is carried out adiabatically, at what rate is the product steam generated?Energy Equation: Example 2: h₂ 80 m = Datum D = 0.2 m 0.02)V² 2g L = 2000 m- = 0.02 V² D2g A horizontal pipe carries cooling water at 10°C for a thermal power plant. The head loss in the pipe is hL Q = 0.06 m³/s where L is the length of the pipe from the reservoir to the point in question, V is the mean velocity in the pipe, and D is the diameter of the pipe. If the pipe diameter is 20 cm and the rate of flow is 0.06 m³/s, what is the pressure in the pipe at L = 2000 m? Assume a₂ = 1.i need the answer quickly
- Water in a 35-cm dia. has 62°F temperature and the discharge is measured as 0.3 m/s and the pressure of 200 Pa. The elevation of the center of the pipe is at 10.5 m a.m.s.l. What is the total energy of the flow? Is the flow laminar or turbulent? Viscosities of Water and AirIf a horizontal force of 890 N is developed by the water jet leaving the pipe on the 90° deflector plate shown in figure below, what is the power produced by the turbine knowing that its efficiency is 90%. Neglect losses. Water 150 mm dia jet ceflector plate6. The nozzle which furnished the water to a certain hydraulic turbine 275 mm in diameter and has coefficient of velocity and discharge of 0.98 and 0.955 respectively. The nozzle is supplied from a 60 cm pipe in which the water approached the nozzle with a total head of 330 m. Compute the energy per second delivered by the jet to the turbine and the energy measure in horsepower lost in passing through the nozzle.