



Neglecting the kinetic energy change of the steam, determine(a) The temperature at the turbine exit and(b) The power output of the turbine. Assume the mass flow rate of steam is 7 kg/s. Saturated liquid water at 10 kPa leaves the condenser of a steam power plant and is pumped to the boiler pressure of 5 MPa. 8116 Steam enters a twostage adiabatic turbine at 8 MPa and 500°C. 51 kJ/kg 0 1000 kPa 3 3 7 3 8 7 7 7 7 7 = ⎭ ⎬ ⎫ = = ° = = = = ° = ⎭ ⎬ ⎫ = = h T T P h h T h x P. The work output of the turbine is 5 MW. (c) The inlet area of the turbine is determined from the mass flow rate relation, 0. Determine the work output of the turbine per unit mass of steam if the process is reversible. b) Steam enters a turbine at 3 MPa, 450°C, expands in a reversible adiabatic process and exhausts at 10 kPa. Potential energy and kinetic energy can be neglected. Compare the follow ing four cycles: (1) A superheated Rankine cycle. Steam is then reheated at constant pressure to a temperature of 500°C before it is routed to the second stage, where it exits at 30 kPa and a quality of 97 percent. The heat loss through the turbine walls is 2 KW. (a) Determine the rate of heat transfer to water. If the power generated by the turbine is 4 MW, determine the rate of entropy generation for the process, assuming that the surrounding medium is at 25 oC. Argon gas enters an adiabatic turbine steadily at 900 kPa and 450°C with a velocity of 80 m/s and leaves at 150 kPa with a velocity of 150 m/s. Compute the work output per kg of steam. An energy balance on the heat exchanger. Steam enters the turbine at 5 MPa, 450 o C and is condensed in the condenser at 15 kPa. (i) What is the mass flow rate of steam through the turbine?. Problem: Steam enters an adiabatic turbine at 6 MPa,600 C, and 80 m/s and leaves at 50 kPa, 100 C,and140 m/s. When the pressure is 1000 kPa, 10 percent of the steam is removed from the turbine for other uses. On land, when used to make electricity the most common type is called a combined cycle gas. 750 Steam at 6000 kPa and 500°C enters a steadyflow turbine. The change in kinetic energy, the power output, and the turbine inlet area are to be determined from the following conditions. From the superheat tables, we find that vin = v(10 MPa, 450oC) = 0. Problem 104 Easy Difficulty =Steam enters a twostage adiabatic turbine at $8 \mathrm{MPa}$ and $500^{\circ} \mathrm{C}$. the power output of the turbine. Steam enters a twostage adiabatic turbine at 8 M P a and 500 ∘ C. At this state, steam is usually a. A High Pressure Ideal Reheat Steam Power Cycle. The remaining steam continues to expand to 10 kPa. The constant. These plants also require large amount of electric power. 7–50 Steam at 6000 kPa and 500°C enters a steadyflow turbine. Assumme the surrounding medium is at 25 ° C. for pt 1 P=Mpa ,T= 220 °Ctsat=263. (C&B) (Sdot) gen = 8. 5–53 Steam enters an adiabatic turbine at 8 MPa and 500°C at a rate of 3 kg/s and leaves at 20 kPa. 001010 m3/kg. Assume that the turbine isentropic efficiency is 80% and the pump isentropic efficiency is 90%. 5 MPa and the quality is 20 percent. Determine (a) the change in kinetic energy, (b) the power output, and (c) the turbine inlet area. Determine (a) the mass flow rate of the steam, (b) the exit velocity of the steam, and (c) the exit area of the nozzle. 583 MPa, which corresponds to the saturation temperature of ammonia at 110°C. If the power output of the turbine is 5 MW, determine (1) the mass flow rate of the steam flowing through the turbine and (2) the isentropic efficiency of the turbine. (b) If the turbine has an. The steam leaves the turbine at 0. If the power output of the turbine is 5 MW and the isentropic efficiency is 77 percent, determine: A. If the power output of the turbine is 2. For the same initial conditions and final pressure the turbine is now run without. 852 kg/s —43 Steam flows steadily through a turbine at a rate of. The angle of the nozzles is 20⁰ to the direction of motion of the blades and the blade velocity is 380 m/s. 7176 Steam enters a twostage adiabatic turbine at 8 MPa and 550°C. The initial temperature and pressure are P = 1 bar, T = 18°C. Assume the surrounding to be at 25oC Fig. Determine the work output of the turbine per kg of steam flowing through the turbine if the process is reversible and changes in kinetic and potential energies are negligible. The gas stream from the gas–liquid separator enters the turboexpander, where it undergoes an isentropic expansion from an absolute pressure of 62 bar to 21 bar (6. Steam enters the highpressure turbine at 12. Heat is added during the isothermal expansion until the steam becomes a saturated vapor. The power output of the turbine is 2. 5 MPa and the quality is 20 percent. 5Refrigerant 134a enters an adiabatic compressor as a saturated vapor at 120 kPa at a rate of 0. According to the U. The isentropic efficiency of the turbine is 0. 5–22 Refrigerant134a enters the compressor of a refrigeration system as saturated vapor at 0. This cycle needs heat input for the boiler either by burning fossil fuels, such as oil, coal, and natural gas, or by obtaining the necessary heat from renewable energy. Assumptions: Pump and turbine are isentropic; P 2 = P 3 = 150 bars = 15 MPa T 3 = 600 C P 4 = P 1 = 0. 1674 kW 2174 kW 2881 kW 3240 kW II. Liquid water density is 997 kg/m3, c p of liquid water is 4. A Rankine reheat cycle has water as the working fluid. Steam leaves a power plant steam generator at 3. Assume the steam is reheated to the inlet temperature of the highpressure turbine. A High Pressure Ideal Reheat Steam Power Cycle. The steam is then reheated to temperature of 400°C before it expands to a pressure of 7. Problem The Reheat Rankine Cycle 10 38 A steam power plant operates on the reheat Rankine cycle. The inlet area of the nozzle is 50 cm 2, and heat is being lost at a rate of 90 kJ/s. Steam enters a Nozzle at 10 bar, 300 C with a velocity of 50 m/s. Neglecting the kinetic energy change of the steam, determine (a) the temperature at the turbine exit and (b) the power output of the turbine. Steam enters an adiabatic turbine at 5 MPa and 450°C and leaves at a pressure of 1. (exp: maximum pressure (12 MPa); reheat pressure (3 MPa)) Example Highpressure steam enters a turbine at 2 Mpa and 400ºC. 66, respectively. Neglecting changes in ke and pe, determine. The elevation difference between and exit ports is negligible. The highest possible percentage of mass of steam that condenses at the turbine exit and leaves the turbine as a liquid is. It leaves the turbine at 0. Steam enters a Nozzle at 10 bar, 300 C with a velocity of 50 m/s. GATE ME 1995. Lower qualities mean water droplets are forming before the steam leaves the turbine. The steam is losing heat to the sur ˙ W rounding air at 100 kPa and 258C at a rate of 300 kW, and the kinetic and potential. Using the Steam Property Calculator, properties are determined using Inlet Pressure and the selected second parameter (Temperature, Specific Enthalpy, Specific Entropy, or Quality). 51 kJ/kg 0 1000 kPa 3 3 7 3 8 7 7 7 7 7 = ⎭ ⎬ ⎫ = = ° = = = = ° = ⎭ ⎬ ⎫ = = h T T P h h T h x P. Steam enters a steam turbine at a pressure of 1 MPa, 300°C and a velocity of 50 m/s. Condenser 1 2 s T 7 5 process heat is typically supplied by steam at 5 to 7 atm and 150 to 200 C. output of an adiabatic steam turbine is 5 MW. ii) Steam enters an adiabatic turbine at 8 MPa and 520°C with a mass flow rate of 3 kg/s and leaves at 30 kPa. 7 kJ/kg s1 = 6. The mass flow rate of the steam is 12 kg/s. Some steam is extracted at the end of the first stage. Transcribed image text: 3 Steam enters an adiabatic turbine at 6 MPa and 600°C and leaves at 10 kPa and 100°C. Neglect kinetic energy changes. Steam at 500°C and 3 MPa enters an adiabatic turbine at 450 kg/s and leaves at 0. 5 \mathrm{MW}$, determine the temperature of the steam at the turbine exit. Neglecting the inlet velocity and considering adiabatic flow, compute (a) the exit enthalpy, in kJ/kg, (b) the exit temperature, in degrees Celsius, and (c) the nozzle exit area, in square centimeters. Find the three mass flows. 654 Steam enters an adiabatic turbine at 5 MPa and 400(C and leaves at a pressure of 200 kPa. Steam enters highpressure turbine of a steam power plant that operates on ideal reheat Rankine cycle at pressure and temperature of 5. Assumptions 1 This is a steadyflow process since there is no change with time. the turbine produces 3. The conservation of energy becomes Solving for Example 54 Steam at 0. Heat losses from the nozzle are estimated to be 20 kW. Determine a) the turbine steam mass flow rate, b) the isentropic efficiency of the turbine. 49P: Steam flows steadily through a turbine at a rate of 45,000 lbm/h, e 5. 4 MPa absolute and 400°C (h = 3121 kJ/kg). The inlet area of the nozzle is 40 cm2. Changes in kinetic and potential energies asked Aug 19, 2019 in Physics by Juhy ( 63. 02975 m3/kg) 1 1 1 1 1 1 mv A v m & & 593C Yes. Steam enters a turbine at 12 MPa, 550°C, and 60 m/s and leaves at 20 kPa and 130 m/s with a moisture content of 5 percent. Steam enters a twostage adiabatic turbine at 8 MPa and 500oC. steam continues to expand through the turbine while doing work and leaves the turbine at 10 kPa. Steam is then reheated at constant pressure to 450°C before it expands in the lowpressure turbine. Transcribed image text: Q3: Steam enters an adiabatic turbine at 8 MPa, 550°C, and (osal äsila pa sub m/s and leaves at 60 kPa, 150°C, and 140 m/s. 3 A 5 m3 tank farm gas storage tank contains methane. 3  4 Reversible adiabatic (isentropic) expansion producing power output. The temperature of steam at the inlets of both turbines is 500°C and the enthalpy of steam is 3185 kJ/kg at the exit of the high pressure turbine and 2247 kJ/kg at the exit of low pressure turbine. Steam enters the turbine at 5 MPa, 450 o C and is condensed in the condenser at 15 kPa; Steam is extracted from the turbine at a pressure of 0. Steam enters the pump as saturated liquid and leaves the turbine as saturated vapor. 5 MPa and 300 m/s. Steam enters an adiabatic turbine steadily at 5 mpa and 450 c, and leaves at 500 kpa and 200 c. T s Isentropic s=constant isothermal Steam enters an adiabatic turbine at 5 MPa and 450 C and leaves at a pressure of 1. Problem The Reheat Rankine Cycle 10– 38 A steam power plant operates on the reheat Rankine cycle. The water then leaves the condenser as saturated liquid. 133, find the ratio of 0. The remainder of the steam is further expanded in the second stage and leaves the turbine at 10 kPa. The pressure and the temperature of steam drop during this process to the values at state 4, where steam enters the condenser. An adiabatic turbine operates in stationary situation as shown, steam enters at 3 Mpa and 450 °c with a volumetric flow rate of 85m^3/min. 5–54 Argon gas enters an adiabatic turbine steadily at 900 kPa and 450°C with a velocity of 80 m/s and leaves at 150 kPa with a velocity of 150 m/s. Liquid water (Vi 0. Chapter 10 1016 Consider a 210MW steam power plant that operates on a simple ideal Rankine cycle. 0 MPa and 600oC at a mass flow rate of 2. Heat losses from the nozzle are estimated to be 20 kW. Neglecting the kinetic energy change of the steam, determine (a) the temperature at the turbine exit and (b) the power output of the turbine. s 2 s = s 1. 5 MPa and 50°C and leaves 10°C below the exit temperature of the. Steam enters an adiabatic turbine at 10 MPa and 500°C and leaves at 10 kPa with a quality of 90 percent. Steam enters the pump as saturated liquid and leaves the turbine as saturated vapor. An illustration of a heart shape Donate. An adiabatic air compressor is to be powered by a directcoupled adiabatic steam turbine that is also driving a generator, as shown in the figure below. The elevation difference between entry and exit ports is negligible. Find (a) the exit temperature of theair and (b) the exit area of the diffuser. 5 MPa and 500°C at a rate of 25 kg/s and exits at 10 kPa and a quality of 0. White Hunnie. The rest of the steam is reheated to 500°C and is expanded in the lowpressure turbine to the condenser pressure of 10 kPa. Steam enters the first stage of turbine at 10 MPa and 5600C, and expand to 1 MPa. Air enters the compressor. Consider an ideal steam reheat cycle where steam enters the highpressure turbine at 4. Steam is then reheated at constant pressure to a temperature of 500°C before it is routed to the second stage, where it exits at 30 kPa and a quality of 97 percent. The inlet area of the nozzle is 50 cm 2 , and heat is being lost. Steam is then condensed at constant pressure and pumped to the boiler pressure of 7MPa. Specific enthalpy  or Sensible Heat  is the quantity of heat in 1 kg of water according to the selected temperature. 4 Steam enters an adiabatic turbine at 8 MPa and 500oC with a mass flow rate of 3 kg/s and leaves at 30 kPa. The feed pump delivers the water to the boiler at a pressure of 3 MPa. The steam enters the turbine at 15 m/s and exits at 60 m/s. 5 MPa and the cycle has the highest and lowest temperatures of 450°C and 45°C respectively. Steam enters the high pressure turbine at 8 MPa and 500°C and leaves at 3 MPa. The steam at 540 °C and at subcritical pressure of 18. Using the Steam Property Calculator, properties are determined using Inlet Pressure and the selected second parameter (Temperature, Specific Enthalpy, Specific Entropy, or Quality). Steam enters a turbine at 100 bars and 400degreeC. 5 MPa to 150 C and 0. 3 A 5 m3 tank farm gas storage tank contains methane. 99°C:subcooledat table 4 p= 5 Mpa,t= 220 °Chf=944. Again we plot this cycle on the Ph. Answers: 1 on a question: Steam enters an adiabatic turbine at 8 MPa and 500 C with a mass flow rate of 3 kg/s andleaves at 30 kPa. 7 MPa (c) T = 450 K, P = 1. 5 Mpa and 4550C. Determine the work output of the turbine per unit mass of steam if the process is reversible. Step 1: Determine Inlet Properties. 63oC condenses on the outside of a 5m long, 4cmdiameter thin horizontal copper tube by cooling liquid water that enters the tube at 25oC at an average velocity of 3 m/s and leaves at 45oC. A Rankine reheat cycle has water as the working fluid. Saturated liquid water at 10 kPa leaves the condenser of a steam power plant and is pumped to the boiler pressure of 5 MPa. An adiabatic turbine operates in stationary situation as shown, steam enters at 3 Mpa and 450 °c with a volumetric flow rate of 85m^3/min. ) The temperature of the steam when it leaves the nozzle. If the power output of the turbine is 6 MW, determine: (a) the mass flow rate of the steam flowing through the turbine. 7126 Steam enters an adiabatic turbine at 7 MPa, 600°C, and 80 m/s and leaves at 50 kPa, 150°C, and 140 m/s. Heat will be. Steam enters an adiabatic nozzle at 1 MPa, 30 m/s, and 250 C. In a friction less process at constant volume the pressure changes to 100 kPa. Steam enters a turbine at 3 MPa, 450°C, expands in a reversible adiabatic process and exhausts at 10 kPa. The maximum cycle temperature is $$ {600^ \circ. Steam enters an adiabatic turbine at 8 MPa and 500°C at a rate of 3 kg/s and leaves at 20 kPa. Then the steam is isobarically reheated to the temperature t m = 460°C in the superheater. Haraguchi, in Advances in Steam Turbines for Modern Power Plants, 2017. 6Mpa and 250C at a rate of 0. Answers: 1 on a question: Steam enters an adiabatic turbine at 8 MPa and 500 C with a mass flow rate of 3 kg/s andleaves at 30 kPa. Assume the surrounding medium is at 25°C. 583 MPa, which corresponds to the saturation temperature of ammonia at 110°C. 001 m/kg) leaves the condensor at 30°C, is pumped to 5 MPa, and returned to the steam generator. 0 MPa and 485C enters the turbine and expands to 1. Calculate the P following each of the successive steps using the ideal gas law. Transcribed image text: 3 Steam enters an adiabatic turbine at 6 MPa and 600°C and leaves at 10 kPa and 100°C. Steam enters an adiabatic turbine with 12. Steam enters an adiabatic turbine steadily at 3 MPa and 400°C and leaves at 50 kPa and 100°C. At the exit the pressure is 1. power output of 80 MW. neglecting the kinetic energy change of the steam, determine a. 95 MPa and 35 C. The problem states that argon gas enters an adiabatic turbine steadily at 900 kPa and 450°C with a velocity of 80 m/s and leaves at 150 kPa with a velocity of 150 m/s. Determine…. ( 3054 kw). What is the mass flow rate of steam through the turbine?. Neglecting the changes in kinetic and potential energies, determine the mass flow rate required for a power output of 5 MW. The mass flow rate drops out and we can use the definition of the specific kinetic energy to obtain the following equation from Eqn 2. Steam enters an adiabatic turbine at 5 MPa and 450°C and leaves at a pressure of 1. Part of the steam is extracted from the turbine at a pressure of 5 bar, at a temperature of 200 °c over an area of 0. If the power output of the turbine is 2. 7 kg/s and leaves at 2 MPa. Steam flows steadily into a turbine with a mass flow rate of 26 kg/s and a negligible velocity at 6 MPa and 600°C The steam leaves the turbine at 0 5 MPa and 200°C with a velocity of 180 m/s The rate of work done by the steam in the turbine is measured to; Steam enters the turbine (leaves the boiler) at P = 110 bar T = 525 0C and mass flow. Neglecting the changes in kinetic and potential energies, determine the mass flow rate required for a power output of 5 MW. Cycle has a net power output of 40 MW. 4 MPa and 400 C (h = 3121 KJ/kg). Mechanical Engineering Q&A Library find the second law efficiency of steam turbine operating steadily at initial pressure of 3 mpa and initial temperature of 450c. Note you need the tables and hs chart for steam. Steam from turbine. (2) Determine the work done per unit mass of the steam flowing through the turbine. H6 (m m 3 =mass of extraction steam to Deareator m 4 =mass of extraction steam in H. 2 MPa and 150 oC. Assumptions 1 This is a steadyflow process. This problem has been solved! See the answer. For the cycle and 1 kg of steam, determine (a) QA , (b) WNET and (c) eC. Determine: a. A steam power plant operating in an ideal Rankine cycle has a high pressure of 5 MPa. Calculate the thermal efﬁciency and the moisture content of the steam leaving the lowpressure turbine. The steam enters the turbine with a pressure of 7 MPa and temperature of 500°C. 30 kPa x = 97%. 0 bar and the entropy has increased by 0. Cycle has a net power output of 40 MW. Steam enters an adiabatic turbine at 8 MPa and 500 degrees Celsius with a mass flow rate of 3 kg/s and leaves at 30 kPa. Steam enters an adiabatic nozzle at 1 MPa, 30 m/s, and 250 C. The power output of the turbine is 2. An ideal gas is used in a gas turbine as shown below. If the power output of the turbine is 6 MW, determine (a) the mass flow rate of the steam flowing through the turbine and (b) the isentropic efficiency of the turbine. GATE SOLVED PAPER  ME THERMODYNAMICS Q. Saturated steam at 99. 1 Answer to Steam enters an adiabatic turbine steadily at 400°C and 3 MPa, and leaves at 50 kPa. If the power output of the turbine is 2. 5 MPa and 550°C at a rate of 7. Onefourth of the steam is extracted from the turbine at 600 kPa pressure for process heating. Q3 Steam enters an adiabatic turbine at 10 MPa and 500°C and leaves at 10 kPa with a quality of 90 percent. The isentropic efficiency of the turbine is 0. The steam pressure after the expansion in the high pressure part of turbine is p m = 1. Saturated liquid water leaves the condenser at 6 kPa and the isentropic pump efficiency is 82%. The steam enters the turbine at v1 = 15 m/sec and exits at v2 = 60 m/sec. 120P: Steam enters an adiabatic turbine at 8 MPa and 500°C with a mass fl. Steam is extracted from the turbine at a pressure of 0. Neglecting the changes in kinetic and potential energies, determine the mass flow rate required for a power output of 5. GATEME2012. 5 MW, determine the temperature of the steam at the turbine exit. Saturated liquid water at 10 kPa leaves the condenser of a steam power plant and is pumped to the boiler pressure of 5 MPa. Given: Turbine is adiabatic (. Steam enters a nozzle at 3000 kPa and 320 °C and leaves at 1500 kPa with a velocity of 535 m/s. 101 MPa and 100 C (h = 2676 KJ/kg). A marine steam plant operates as a simple Rankine cycle with a turbine inlet temperature and pressure of 600 °C and 4 MPa. The gas constant of Ar is R = 0. Assume the surrounding medium is at 25°C. ( d) 16% ( e )0%. Steam is then reheated at constant pressure to a temperature of 500 C before it is routed to the second stage, where it exists at 30 kPa and a quality of 97 %. If the power output of the turbine is 2MW, determine the temperature (or quality, if saturated) of the steam at the turbine exit. Changes in kinetic and potential energies asked Aug 19, 2019 in Physics by Juhy ( 63. Find the three mass flows. At the exit the pressure is 1. 852 kg/s —43 Steam flows steadily through a turbine at a rate of. If the power output of the turbine is 2. Steam is then reheated at constant pressure to 450°C before it expands in the lowpressure turbine. 5 mw of power as a result. The steam enters the turbine at v1 = 15 m/sec and exits at v2 = 60 m/sec. Assume the process operates at steadystate. Steam is then reheated at constant pressure to a temperature of 500 ∘ C before it is routed to the second stage, where it exits at 30 k P a and a quality of 97 percent. Steam enters the turbine at 10 MPa and 500°C and is cooled in the condenser at a pressure of 10 kPa. The inlet area of the turbine is 60 cm2. Steam enters the turbine at 12. 12 1 C C W wvPP m. The steam enters at 80 m/s, and leaves at 40 m/s. PROBLEM 5 Steam leaves the boiler in a steam turbine plant at 2 MPa, 3000C and is expanded to 3. 0 MPa, 480°C, and expands to 0. The isentropic efficiency of the turbine is 0. Solution for The second steam power plant operates on a regenerative Rankine cycle, where water is used as the working fluid. The inlet area of the turbine is is 60 cm2. A back pressure steam turbine of 100,000 KW serves as a prime mover in a cogeneration system. Part of the steam is extracted from the turbine at a pressure of 5 bar, at a temperature of 200 °c over an area of 0. Determine the enthalpy at exit and calculate the flow rate of steam in kg/s. The isentropic efficiencies of the. Feed water leaves the closed heater at 205 o C and 8. The steam exits the turbine at 200 KPa and 260(C. (3) Calculate the mass flow rate of the steam. The steam expands in the turbine while doing work until the pressure is 1000 kPa. In a particular reheatcycle power plant, steam enters the highpressure turbine at 5 MPa, 450°C, expands to 0. Highpressure turbine 6 3 5 4 Boiler P4 = P5 = Preheat Pump LowP Turbine Lowpressure turbine steam, which ideally leaves the heater as a saturated liquid at the extraction pressure. reheat Rankine cycle. The power output of the turbine is 800 kW. 6 MPa, the steam is reheated to 500 °C and expanded in a second turbine to a condenser pressure of 5 kPa. Steam is then reheated at constant pressure to a temperature of 500°C before it is routed to the second stage, where it exits at 30 kPa and a quality of 97 percent. ( d) 16% ( e )0%. Lowering the condenser pressure always helps in delivering more network in the turbine as more expansion of steam in. a he entire expansion process by the steam through the turbine is reversible and adiabatic. Specific enthalpy  or Sensible Heat  is the quantity of heat in 1 kg of water according to the selected temperature. 88 In a reheat cycle steam at 8. 5" floppy disk. In [34]: #Given Inputs: P_1 = 8000 # turbine inlet pressure [kPa]. 548: Steam enters an adiabatic turbine at 10 MPa and 5008C and leaves at 5. a) A fluid at 200 kPa and 3000C has a volume of 0. Water leaves the feed water heater as a saturated liquid. the exiting steam leaves the turbine at a velocity of 500 ft/s. Start an analysis: A Rankine cycle has an exhaust pressure from the turbine of 0. neglecting the kinetic energy change of the steam, determine a. 22 MW (B) 6. The steam expands through the low pressure turbine and enters the condenser as a saturated vapour at 0. Steam enters a Nozzle at 10 bar, 300 C with a velocity of 50 m/s. The supercritical pressure thermal power plant (SC) adopts, in general, 24. Steam (superheated H2O) enters an adiabatic turbine steadily at 5 MPa, 450°C and 30 m/s, and leaves at 0. 12 1 C C W wvPP m. Steam enters an adiabatic turbine at 5 , 500 and with a veloci ty of 50 / and ex its at 50 , 100 and with a velocity of 150 /. Solved: Steam enters an adiabatic turbine at 10 MPa and [math]500^{\circ} \mathrm{C}[/math]and leaves at 10 kPa with a quality of 90 percent. Steam enters a twostage adiabatic turbine at 8 MPa and 500oC. For a pressure ratio of 5 and a maximum temperature of 850°C determine the thermal efficiency using the Brayton cycle. at the turbine inlet and exit. The valve to a supply line is opened and refrigerant at 1 MPa and 120°C is allowed to enter the tank until the pressure reaches 800 kPa, when the valve is closed. The temperature of the steam is 450 oC at the entrance to both the high and lowpressure turbines. Carnot cycle consists of two isentropic processes: reversible, adiabatic compression and expansion plus two isothermal processes. Determine the maximum amount of work that can be delivered by this turbine. [Manual Solution] [TEST Solution] Answers: (a) 4. High pressure air at 1300 K flows into an aircraft gas turbine and undergoes a steadystate, steadyflow, adiabatic process to the turbine exit at 660 K. Steam enters an adiabatic turbine at 800 psia and 900°F and leaves at a pressure of 40 psia. An illustration of two photographs. Absolute Pressure = Gauge Pressure + Atmospheric Pressure. Determine exit area of the Nozzle, assuming the expansion to be reversible adiabatic. Steam enters an adiabatic turbine steadily at 2. The steam enters at 450 C, and exits as saturated vapor at 0. Steam enters the turbine at 10 MPa and 500 °C and is cooled in the condenser at a pressure of 10 kPa. Liquid water (Vi 0. A steam power plant operates on an ideal regenerative Rankine cycle. Then the steam is isobarically reheated to the temperature t m = 460°C in the superheater. Steam leaves the boiler at 3. 5 MPa and 200C to produce saturated vapor at 2 MPa. The power plant operates on a simple ideal Rankine cycle with turbine inlet conditions of 5 MPa and 450°C and a condenser pressure of 25 kPa. An ordinary vapor compression cycle is to be operated on methane to cool a chamber to 260°F. Changes in kinetic and potential energies asked Aug 19, 2019 in Physics by Juhy ( 63. Steam at 6 MPa and 500oC enters a twostage adiabatic turbine at a rate of 10 kg/s. 7 kg/s and leaves at 2 MPa. An ideal reheat Rankine cycle operates between the pressure limits of 10 kPa and 8 MPa, with reheat being done at 4 MPa. It expands in the first stage to a state of 2 M P a and 350 ∘ C. 7—117 Steam enters an adiabatic turbine at 5 MPa, 6500C, and 80 m/s and leaves at 50 kPa, 1500C, and 140 m/s. 101M A Carnot cycle operates with steam as the working medium. Changes in kinetic and potential energies between the inlet and the exit of the turbine are small. 001 m/kg) leaves the condensor at 30°C, is pumped to 5 MPa, and returned to the steam generator. A highpressure stage of steam turbine operates at steady state with inlet conditions of 6 MPa, t = 275. Neglecting the changes in kinetic and potential energies, determine the mass flow rate required for a power output of 5 MW. Determine a. 0 MPa, 400 C, amd then expands to 0. 1 InkJ/kg enthalpy of steam at the exit 1842. If the power output of the turbine is 5 MW, determine (1) the mass flow rate of the steam flowing through the turbine and (2) the isentropic efficiency of the turbine. The steam leaves the turbine at 0. Onefourth of the steam is extracted from the turbine at 600kPa pressure for process heating. If the mass ﬂow rate is 6 kg/s, the power. 84 MW, (b) 85. A steam power plant operates on the reheat Rankine cycle. An adiabatic turbine is supplied with steam at 2. 5 MPa and is then routed to the process heater, where it supplies the process heat. GATEME2012. 5Refrigerant 134a enters an adiabatic compressor as a saturated vapor at 120 kPa at a rate of 0. Steam enters the highpressure turbine at 15 MPa and 600°C and is condensed in the condenser at a pressure of 10 kPa. 5 MPa and 300 m/s. The temperature of steam at the inlets of both turbines is 500°C and the enthalpy of steam is 3185 kJ/kg at the exit of the high pressure turbine and 2247 kJ/kg at the exit of low pressure turbine. 87 kg/s, 68 m/s) 20. 63oC condenses on the outside of a 5m long, 4cmdiameter thin horizontal copper tube by cooling liquid water that enters the tube at 25oC at an average velocity of 3 m/s and leaves at 45oC. 579 Steam expands in a turbine. Steam is then reheated at constant pressure to 450 °C before it expands in the lowpressure turbine. If the power output of the turbine is 2. 6 MPa is generated in the boiler and transported to the steam turbine, which consists of the high pressure section (numbered 5 in Fig. Step 1: Determine Inlet Properties. 458 EXERGY 3 MPa 450°C 300 kW EXAMPLE 8–15 SecondLaw Analysis of a Steam Turbine Steam enters a turbine steadily at 3 MPa and 4508C at a rate of 8 kg/s and exits at 0. Wɺ out mɺ out 2 mɺ in 1. If the power output of the turbine is 5 MW, determine (a) the reversible power output and (b) the second –law efficiency of the turbine. Steam enters the turbine at 6 MPa and 450^0 C at a rate of 20 kg/s and expands to a pressure of 0. 006 MPa and 85% quality and velocity of 15 m/s. 5 Mpa and 4550C. Compute the efficiency of the turbine in problem 2. Determine the work produced by the turbine, the work used by the feedwater pump, and the cycle thermal efficiency. Assume the surroundings to be at 25°C. Determine power developed by the Turbine, assuming it to be adiabatic. Steam enters the high pressure turbine at 10 MPa and 500˚C and the low pressure turbine at 1 MPa and 500˚C. The steam expands through the low pressure turbine and enters the condenser as a saturated vapour at 0. c) the entropy change in the expansion process. 4 USC pressure thermal power plant. Answers: (a) 0. 43 MW (C) 7. If the isentropic efficiency of the compressor is 80%, determine (a) the temperature of the refrigerant at the exit of the compressor and (b) the power input in kW. Determine the work output of the turbine per unit mass of steam if the process is reversible. Again we plot this cycle on the Ph. 51 A power plant with one closed feedwater heater has a condenser temperature of 45 C, a maximum pressure of 5 MPa, and boiler exit temperature of 900 C. 2 MPa 500°C. Steam enters an adiabatic turbine at 5 MPa and 450°C and leaves at a pressure of 1. The rest of the steam is reheated to 500 C and is expanded in the lowpressure turbine to the condenser pressure of 10 kPa. For the cycle and 1 kg of steam, determine (a) QA , (b) WNET and (c) eC. Steam enters a turbine at 12 MPa, 550°C, and 60 m/s and leaves at 20 kPa and 130 m/s with a moisture content of 5 percent. (2) The net work per unit of steam flow in kJ/kg. Neglect the kinetic energy change of water, and take the specific volume of water to be 0. 852 kg/s —43 Steam flows steadily through a turbine at a rate of. 5–49 Steam flows steadily through an adiabatic turbine. K The chimney base temperature is 260 °C The SHC of the dry flue gases is 1,005 kJ/kg. Steam then enters a back pressure turbine and expands to the pressure of the process, which is 0. If the power output of the turbine is 6 MW, determine (a) the mass flow rate of the steam flowing through the turbine and (b) the isentropic efficiency of the turbine. 51 kJ/kg 179. If the power generated by the turbine is 4 MW and isentropic efficiency is 80 %, a) determine the mass flow rate of steam b) determine the temperature at the turbine exit and the rate of entropy generation for this process. output is nearest (A) 5. Steam enters an adiabatic turbine at 5 MPa and 450°C and leaves at a pressure of 1. Steam enters a twostage adiabatic turbine at 8 MPa and 500oC. Steam at 16 bar pressure and 340°C temperature is expanded in a steam turbine to 0. 1 MPa 200°C Feedwater. The refrigerant enters the condenser at 1. Assume the steam is reheated to the inlet temperature of the highpressure turbine. Assumptions 1. 7 kg/s and leaves at 2 MPa. Steam enters the turbine at 6MPa and 450C and is condensed in the condenser at 20 kPa. The rest of the steam is reheated to 500 C and is expanded in the lowpressure turbine to the condenser pressure of 10 kPa. The angle of the nozzles is 20⁰ to the direction of motion of the blades and the blade velocity is 380 m/s. If the power output of the turbine is 6 MW, determine (a) the mass flow rate of the steam flowing through the turbine and (b) the isentropic efficiency of the turbine. Lower qualities mean water droplets are forming before the steam leaves the turbine. H7 m 2 =mass of extraction steam in H. In a reheatcycle power plant, steam enters the highpressure turbine at 5 MPa, 450°C, and expands to 0. When the pressure is 1000 kPa, 10 percent of the steam is removed from the turbine for other uses. Find the necessary boiler exit temperature and the total mass flow rate. In this example the HP turbine expands the steam from 15 MPa to 1 MPa, and the steam is subsequently reheated back to 600°C before being expanded in the LP turbine to 10 kPa. Determine…. 1 bar with an isentropic efficiency 0. The steam flow rate is 1. 12 1 C C W wvPP m. Steam enters a group of nozzles of a steam turbine at 12 bar and 2200 C. An air standard Limited pressure cycle has a compression ratio of 15 and compression begins at 0. The discharge from the adiabatic, reversible turbine is at 25C. Liquid water density is 997 kg/m3, c p of liquid water is 4. A Rankine cycle operates between pressures of $$80$$ bar and $$0. Steam is then reheated at constant pressure to 450°C before it expands in the lowpressure turbine. Some steam is extracted from the turbine at a pressure of 0. Determine the maximum amount of work that can be delivered by this turbine. Dry saturated steam at a pressure of 8 bar enters the convergent divergent nozzle and leaves it at a pressure 1. The power output of the turbine in MW is (A) 6. Consider the twostage, adiabatic steam turbine, shown below. It expands in the first stage to a state of 2 M P a and 350 ∘ C. Steam enters the high pressure turbine at 10 MPa and 500˚C and the low pressure turbine at 1 MPa and 500˚C. [551] Steam enters an adiabatic turbine at 10 MPa and500°C and leaves at 10 kPa with a quality of 90 percent. 87 kj/kg At 4 MPa: h = 3330. The isentropic efficiency of the turbine is. 5 MPa and 500°C at a rate of 25 kg/s and exits at 10 kPa and a quality of 0. 47 kj/kg, hg = 2645. Determine power developed by the Turbine, assuming it to be adiabatic. 001010 m3/kg. 5 MPa, 400 C, and enters the turbine at 3. Determine a) the turbine steam mass flow rate, b) the isentropic efficiency of the turbine. In a power plant, employing a Rankin cycle with reheat modification, the steam enters the turbine at 3 MPa and 500 °C. 0 Mpa, 480 o C and expands to 0. The Specific Enthalpy is then multiplied by the Mass Flow to get the Energy Flow: Pressure = 540. Steam enters an adiabatic turbine steadily at 3 MPa and 400°C and leaves at 50 kPa and 100°C. Saturated liquid exits the open feedwater heater at 1 MPa. Using the Steam Property Calculator, properties are determined using Inlet Pressure and the selected second parameter (Temperature, Specific Enthalpy, Specific Entropy, or Quality). heat loss to the surroundings. c) the entropy change in the expansion process. 6 kJ/kg: Feedback:. Wɺ out mɺ out 2 mɺ in 1. The refrigerant enters the condenser at 1. Determine (a) the change in kinetic energy, (b) the power output, and (c) the turbine inlet area. Determine the work output of the turbine per unit mass of steam if the process is reversible. Gateway Generating Station, a 530megawatt combined cycle natural gasfired power station in California. 861 Steam enters an adiabatic turbine at 6 MPa, 600°C, and 80 m/s and leaves at 50 kPa, 100°C, and 140 m/s. Determine the maximum amount of work that can be delivered by this turbine. Steam enters an adiabatic turbine at 8 MPa and 500°C at a rate of 3 kg/s and leaves at 20 kPa. The turbine produces work at a rate of 177. Steam enters the turbine at 10 MPa and 500 °C and is cooled in the condenser at a pressure of 10 kPa. Steam enters an adiabatic turbine at 10 MPa and 500°C and leaves at 10 kPa with a quality of 90 percent. 5 MPa and 550°C at a rate of 7. The constant. Neglecting the changes in kinetic and potential energies, determine the mass flow rate required for a power output of $5 \mathrm{MW}$. 5 MPa and 500°C at a rate of 25 kg/s and exits at 10 kPa and a quality of 0. ) The mass flow rate of steam in kg/s b. BPE 211 APPLIED THERMODYNAMICS Musadoto ISBNIWRD20160011 QN 16/4 Steam enters an adiabatic turbine at 8 MPa and 500o C with a mass flow rate of 3 kg/s and leaves at 30 kPa. Wɺ out mɺ out 2 mɺ in 1. The remainder of the steam is further expanded in the second stage and leaves the turbine at 20 kPa. The condenser is cooled by water which enters at a temperature of 5°C and leaves at a temperature of 25°C. Neglecting the changes in kinetic and potential energies, determine the mass flow rate required for a power output of 6MW. In [34]: #Given Inputs: P_1 = 8000 # turbine inlet pressure [kPa]. Find the plant. High pressure air at 1300 K flows into an aircraft gas turbine and undergoes a steadystate, steadyflow, adiabatic process to the turbine exit at 660 K. a he entire expansion process by the steam through the turbine is reversible and adiabatic. Air enters the compressor of a gas turbine at 100 kPa and 25° C. What is the velocity at that point? a. Steam leaves a power plant steam generator at 3. Determine the turbine work output, in kJ/kg, and the thermal efficiency of the cycle. thermal 3:21 V. If the power generated by the turbine is MW, determine the rate of entropy generation for this process. Steam is then reheated to 800°F before it expands to a pressure of 1psia. 80, and the condensate leaves the condenser at a temperature of 30°C. Steam enters the turbine at 10 MPa and 600°C and exhausts to the condenser at 5 kPa. The inlet conditions of the steam are 10 MPa, 450°C, and 80 m/s, and the exit conditions are 10 kPa, 92 percent quality, and 50 m/s. 4—81 Steam enters an adiabatic turbine at 10 MPa and 4000C and leaves at 20 kPa with a quality of 90 percent. Liquid water (Vi 0. (b) C p;av at the average temperature is used. heat loss to the surroundings. From the steam tables, at 600°C and 2 MPa, With the above value for s we see that state 2 is in the quality region. 7B2 : Work Output of an Adiabatic, Reversible Turbine: 5 pts: Steam enters an adiabatic turbine at 5 MPa and 450 o C and leaves at a pressure of 1. 7 kg/s and leaves at 2 MPa. If the power output of the turbine is 6 MW, determine (a) the mass flow rate of the steam flowing through the turbine and (b) the isentropic efficiency of the turbine. The gas constant of Ar is R = 0. Determine the power produced (kW) by the turbine if the mass flow rate is 1. Steam enters an adiabatic turbine at 5 MPa and 400°C and leaves at a pressure of 200 kPa. The condenser operates at a pressure of 20kPa. Solved: Steam enters an adiabatic turbine at 10 MPa and [math]500^{\circ} \mathrm{C}[/math]and leaves at 10 kPa with a quality of 90 percent. 5 MPa and 550°C at a rate of 7. 2 MPa and reheated to 350 °C and finally expanded to the condenser pressure of 10 kPa. 5 MPa, after which it is reheated to 450°C. Steam is then reheated at constant pressure to 450°C before it expands in the lowpressure turbine. 5 MPa and 550Â°C at a rate of 7. Steam flows into a turbine with the characteristics below at a rate of 10 kg/s and 10 kw of heat are lost from the turbine. Find (a) the velocity at the nozzle exit, and (b) the volume flow rate at the nozzle exit. The pressure at the exit of the turbine is 0. EXAMPLE 7–5 Isentropic Expansion of Steam in a Turbine Steam enters an adiabatic turbine at 5 MPa and 450°C and leaves at a pressure of 1. For the same initial conditions and final pressure the turbine is now run without. A steam turbine receives superheated steam at 1. Steam enters an adiabatic turbine at 5 , 500 and with a veloci ty of 50 / and ex its at 50 , 100 and with a velocity of 150 /. the heat loss from the steam turbine to the surroundings is 250kw. Steam enters an adiabatic turbine at 5 MPa and 450 degree C and leaves at a pressure of 1. The exit pressure is 1 bar. output is nearest (A) 5. Analysis of a TwoStage, Adiabatic Turbine  6 pts : Problem Statement : A wellinsulated twostage turbine operating at steadystate is shown in the diagram. If the power generated by the turbine is 4 MW, determine the rate of entropy generation for this process. Assume the expansion inside the turbine to be reversible and adiabatic. 0 MPa and 600oC at a mass flow rate of 2. The steam is losing heat to the surrounding air at 100 kPa and 25 oC at a rate of 300 kW, and kinetic and potential energies are negligible. 43 MW (C) 7. An air standard Limited pressure cycle has a compression ratio of 15 and compression begins at 0. 4 USC pressure thermal power plant. The steam leaves the turbine at 0. the question can simply be solved by using the. Irreversibilities in the turbine of Problem 9 cause the steam quality at the turbine outlet to be 80%. 1 bars = 0. An illustration of a heart shape Donate. Determine power developed by the Turbine, assuming it to be adiabatic. The mass flow rate of the steam is 12 kg/s. In this example the HP turbine expands the steam from 15 MPa to 1 MPa, and the steam is subsequently reheated back to 600°C before being expanded in the LP turbine to 10 kPa. Feed water leaves the closed heater at 205 o C and 8. What is the velocity at that point? a. Show the cycle on a Ts diagram with respect to the saturation lines and determine (a) the quality of steam at the turbine exit, (b) the thermal efficiency of the cycle, and (c) the mass flow rate of the steam. The inlet conditions of the steam are 10 MPa, 450°C, and 80 m/s, and the exit conditions are 10 kPa, 92 percent quality, and 50 m/s. 7 kg/s and leaves at 2 MPa. If the power output of the turbine is 2 MW, • Unlike turbine, they produce pressure drop without work • Often pressure drop comes If the mixture leaves the mixing chamber at. Steam enters the turbine at 6 MPa and 450^0 C at a rate of 20 kg/s and expands to a pressure of 0. A Rankine reheat cycle has water as the working fluid. The remaining steam expands through the second turbine stage to the condenser pressure of 6 kPa. 3  4 Reversible adiabatic (isentropic) expansion producing power output. If the power output of the turbine is 6 MW, determine (a) the mass flow rate of the steam flowing through the turbine and (b) the isentropic efficiency of the turbine. 9, where steam enters the highpressure turbine at 3 MPa and 400 C and then expands to 0. The power output of the turbine is 800 kW. The rest of the steam is reheated to 500°C and is expanded in the lowpressure turbine to the condenser pressure of 10 kPa. Changes in kinetic and potential energies asked Aug 19, 2019 in Physics by Juhy ( 63. 4 USC pressure thermal power plant. Steam flowing at 25 kg/s, 10 MPa, and 400 oC is expanded in an adiabatic turbine. Answer the following. Neglect kinetic and potential energy changes, determine the mass flow rate of liquid, in kg/h, for a steam mass flow rate of 50,000 kg/h. Calculate the thermal efﬁciency and the moisture content of the steam leaving the lowpressure turbine. 549E: Steam flows steadily through a turbine at a rate of 45,000 lbm/h, e 5. 3361 [turbine5000kPa] Steam enters a turbine, operating at steady state, at 5000 kPa and 500 o C with a mass flow rate of 5 kg/s. If the power output of the turbine is 2. Neglecting the kinetic energy change of the steam, determine (a) the temperature at the turbine exit and (b) the power output of theturbine. The rest of the steam is reheated to 500 C and is expanded in the lowpressure turbine to the condenser pressure of 10 kPa. Problem 2 The net power output of an adiabatic steam turbine is 5 MW.

