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- Show the COMPLETE SOLUTIONS and DIAGRAM (pv and Ts) including the switching of table and interpolations/extrapolations: NO Calculator Technique and Applications. 1. Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine at 3 MPa and 350°C and is condensed in the condenser at a pressure of 75 kPa. Determine the thermal efficiency of this cycle.A power plant using a Rankine power generation cycle and steam operates at a temperature of 81.25°C in the condenser, a pressure of 5 MPa in the boiler and a maximum boiler temp of 775°C. The cycle operates at steady state with a mass flow rate of 2.5kg/s. Use the steam tables in the appendix of Sandler (p. 917 to 925). a.) Draw out the cycle, calculate the work required for the pump, the work output by the turbine, the heat into the boiler, and the heat out of the condenser. b.) What is the efficiency of this power plant? c.) If the turbine was only 89% efficient but still adiabatic (only generates 89% of the calculated work from part b), what is the overall efficiency of the cycle?Steam is supplied to a two-stage turbine at 40 bar and 350 o It expands in the first turbine until it is just dry saturated, then it is reheated to 350 oC and expanded through the second stage turbine; the isentropic efficiencies of the first and second stage turbines are 84 % and 78 % respectively. The condenser pressure is 0.035 bar. Sketch the process on a T-s diagram and calculate; i. The work output and heat supplied per kg of steam for the plant assuming ideal processes ii. The thermal efficiency of the cycle iii. The specific steam consumption
- 1. Consider a steam power plant that operates on a simple ideal Rankine cycle and has a net power output of45 MW. Steam enters the turbine at 7 MPa and 500°C and iscooled in the condenser at a pressure of 10 kPa by runningcooling water from a lake through the tubes of the condenserat a rate of 2000 kg/s. Show the cycle on a T-s diagram withrespect to saturation lines, and determine (a) the thermal efficiency of the cycle, (b) the mass flow rate of the steam, and(c) the temperature rise of the cooling water. Answers:(a) 38.9 percent, (b) 36 kg/s, (c) 8.4°C 2. Consider a 210-MW steam power plant that operateson a simple ideal Rankine cycle. Steam enters the turbine at10 MPa and 500°C and is cooled in the condenser at a pressure of 10 kPa. Show the cycle on a T-s diagram with respectto saturation lines, and determine (a) the quality of the steamat the turbine exit, (b) the thermal efficiency of the cycle,and (c) the mass flow rate of the steam. Answers: (a) 0.793,(b) 40.2 percent, (c) 165…In a Reheat Cycle steam enters the turbine @ 40 bar and 400 C. It expands isentropic ally to 6 bar and is reheated at constant pressure to 400 C. This steam expanded isentropic ally to 1 bar and is reheated at constant pressure to 200 C. Finally this steam is expanded isentropic ally in the condenser pressure of 0.1 bar. Determine the thermal efficiency and the capacity of the boiler if 10,000 KW of power output is required.An ideal regenerative cycle is executed with steam generation at 10 MPa and 600 deg C. Before condensation at 0.005 MPa, steam is extracted for feedwater heating first at 2.5 MPa and second at 0.6 MPa. On the basis of 1 kg of throttle steam, find: a. m1 and m2 in kg/kg b. ec in percent c. ee in percent Reminder: 1. For values taken from the steam tables: Use them as is, do not round off. 2. For values obtained by interpolation and final answers obtained by solving, use FOUR (4) decimal places.
- An ideal regenerative cycle is executed with steam generation at 10 MPa and 600 deg C. Before condensation at 0.005 MPa, steam is extracted for feedwater heating first at 2.5 MPa and second at 0.6 MPa. On the basis of 1 kg of throttle steam, find: a. m1 and m2 in kg/kg b. ec in percent c. ee in percent Reminder: 1. For values taken from the steam tables: Use them as is, do not round off. 2. For values obtained by interpolation and final answers obtained by solving, use FOUR (4) decimal places. please use this steam table https://drive.google.com/drive/folders/1jGaspdm5O-DfZylEuR2bnxBshJQrq0Ww?usp=sharingA refrigerator operating using vapor-compression cycle uses R-134a as a working fluid. The condenser temperature is 65oC and the evaporator temperature is -15oC. The compressor operates at 80% efficiency. Suppose that we replace the expansion valve in the vapor-compression cycle with a turbine that operates at 80% efficiency. Determine the coefficient of performance of the refrigeration cycle. Provide the new state properties (i.e. H, P, T and S) for this changes and use CATT for any values neededThe Problem: Supposedly you are a cadet engineer in a certain steam power plant that employ a reheat-regenerative ideal Rankine cycle. You are told that it will utilized one open feed heater (OFH). The condition are as follows: Steam is supplied with a condition of 2175.57 psia and 1112 °F. Also, it was measured that condenser pressure is 10 kPa. It was also observed that there are some steam is extracted from the turbine at 40 bar for closed feed water heater while the unextracted steam is reduced at 4000 kPa to 600°C. You are also reminded that the extracted steam is totally liquified in this closed feed water heater and then is pumped to 150 bar before joining with the feed water heater. Note that steam for the open feed water heater is bled from L.P. turbine at 5 bar. Determine : (i) Determine the amount of steam fraction that was extracted from the turbines (at each bled heater) (ii) What is the thermal efficiency of the system. (ii) Provide the process diagram for this problem.
- A steam power plants operates between a boiler pressure of 40 bar and a condenser pressure of 0.04 bar. If steam entry to the turbine with dry saturated calculate for a carnot cycle : i. Sketch the T-s diagram ii. Find T1 and T2 iii. Find h1 and h2 iv. Calculate the efficiency Carnot cycleQ3. Consider a refrigerator operating on an ideal vapour-compression refrigeration cycle between pressures of 0.8435 and 8.8672 bar and using R134a as the working fluid. Pressure drops in the evaporator and condenser may be neglected. (a) . Sketch the cycle on the T-s diagram. ii. Sketch the cycle on the p-h diagram including labels for the components on the diagram, heat and work transfers, as well as the pressure values given above. i. Name three assumptions made about the compression process in an ideal vapour compression refrigeration cycle. (b) i Determine the specific enthalpy before and after the evaporator (kl/kg). i. Determine the refrigerant duty (Q.) if the mass flow rate of the refrigerant is 15.3 x 10 kg/s. i. Determine the specific enthalpy after the compressor (kl/kg). iv. Determine the compressor power and the coefficient of performance.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.