A medium size power station is used to produce 30 MW net power for a refinery. The station uses steam as the operating fluid and operates according to the Carnot cycle between the pressure limits of 0.4 bar and 35 bar. Steam enters the boiler as a saturated liquid and leaves it as a dry saturated vapour.
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Q: A medium size power station is used to produce 30 MW net power for a refinery. The station uses stea...
A: Given data Upper pressure limit = 35 bar Lower pressure limit = 0.4 bar
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- I need the workings ASP the answers are there questionn 4 4. A boiler produces 6 tonnes/hour of steam at a pressure of 1.8 MPa and a temperature of 250ºC.Feedwater enters at a temperature of 39ºC. At exit from the economizer part of the boiler thetemperature is 72ºC. At exit from the evaporator part of the boiler the steam is 90 % dry.Energy is supplied by 650 kg of coal per hour, which has a calorific value of36 MJ/kg. The A/F ratio is 25 : 1. The temperature of the flue gas at entry to the economizerpart of the boiler is 430ºC. The average specific heat at constant pressure of the flue gas inthe economizer is 1045 J/kg.K.4.1 Calculate the efficiency of the boiler. [70.5 %] this one is the answer 4.2 Draw up an energy balance, on a kJ/kg coal basis, with percentages of the total energysupplied. [economizer 3.6 %, evaporator 59 %, superheater 8 %,other 29.4 %]A medium size power station is used to produce 30 MW net power for arefinery. The station uses steam as the operating fluid and operatesaccording to the Carnot cycle between the pressure limits of 0.4 bar and35 bar. Steam enters the boiler as a saturated liquid and leaves it as adry saturated vapour. (i) Calculate the thermal efficiency of the power station if theisentropic efficiency of the steam turbine is 94%. (ii) State main disadvantages of using the Carnot cycle as the basis fora power station. (iii) State the name of the cycle that is used in practice in powerstations, along with three key benefits over the Carnot cycle.A reversible refrigerator operates using a Carnot refrigeration cycle. It operates usingr-134a between 140 and 400 kPa. The refrigerant exits the compressor (and enters the condenser) assaturated vapor. It also leaves the condenser as saturated liquid.a. Sketch the P-v and T-s diagram of this cycle. Define the coordinate properties of each state oneach graph.b. Evaluate the specific heat and specific work properties of each (in kJ/kg). Indicate the sense.c. Evaluate the coefficient of performance using the specific heats and works from the previousitem. Did it match with the COPR obtained if you used the operating temperatures? Solve for states first. Then, show the solution to each of the above required in order.
- write legibly pls A simple gas-turbine operates with air as the working fluid, a pressure ratio of 18:1 and a maximum temperature of 700°C. The air enters the compressor at 100kPa and 20°C. Determine: a. Thermal Efficiency of the cycleb. The heat addedc. The state of the air exhausted by the turbineThank youA steam turbine produces 2.5 MW of work. Steam enters the turbine at 4 MPa and 400oC. Steam out turbine at 1.4 MPa and 300 C.a. What type of turbine is this (back pressure, condensing,extraction)! Why?b. Determine the steam flow rate (kg/hour)! (51963)c. Determine TSR and ASR (units must be stated)! (13,13 and20.79 kg/kWh)d. Determine the efficiency of the steam turbine!
- A reheater cycle is executed of 1 kg steam expanding initially from 12.547 Mpa and540.547 oC. The reheater pressures are 2.5547 Mpa and the steam leaves the reheaterat 420.547 oC. Condensation occurs at 0.02547 Mpa. Calculate W, ec and ee.(1) Steam generated in a Rankine steam power cycle at 80 bar and 600°C is fed to a turbine. Exhaust from the turbine enters a condenser at 100 kPa, where it is condensed to saturated liquid which is then pumped to a boiler. a. b. C. d. Determine the power of the turbine and compressor per kg of steam. Determine the efficiency of the Rankine cycle. If the Rankine cycle produces 100 MW of power, what is the mass flow rate of steam in kg/s? If the isentropic efficiency of the turbine and compressor are 75%, recalculate the mass flow rate of steam in kg/s.Q1) Steam is supplied to a turbine at 30 bar and 350°C, The turbine exhaust pressure is 0.08 bar. The main condensate is heated regene ratively in two stages by steam bled from the turbine at 5 bar and 1.0 bar respectively. Calculate masses of steam bled off at cach pressure per kg of steam entering the turbine and the theoretical thermal efficiency of the cycle. 1 kg Turbine m- me 1-m,-m: Condenser O 1- m, m. h, m he 1 kg fwwww www 1 kg Heater-1 (H.P.) Drain cooler m,+ m m, Heater-2 (LP.)
- Steam is generated at 4.10 Mpa and 440°C and condensation occurs at 0.105 MPa a. For a Rankine engine operating between these limits, computethe thermal efficiency and the heat rate b. Considering that a Rankine cycle occurs between same limits, determine QA, QR, Wnet and eth c. What mass flow rate is required for a net output of 30 000 kW Don't answer the given problem, just give me the schematic diagram and t-s diagram of the given problemDraw the schematic diagram for regenerative vapour power cycle with 2 steam blades. Represent the complete process in T-S diagram1) In the condenser of the power plant, Ammonia is isobarically condensed to saturated liquid state with 615.2??? and ? = 0.9, the mass flow rate is 4 ?/h. The heat rejected from the condensing ammonia is added to heat water, which is heated from 277K to 281K. Whar is the mass flow rate of water in ?/h 2) A flow of compressed liquid water at 15??? (In an advanced steam power plant), 308K is mixed adiabatically with a liquid-vapor mixture flow at the same pressure with quality of x=0.88 .The resulting mixture is in the saturated liquid state and the total mass flow is 5 ?/???. What is the mass flows of the incoming flows, and the entropy generation rate, and the work loss for the process (with respect to standard environment, ? = 298?)