FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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In a steam power plant operating according to the ideal Rankine cycle at 4MPa pressure and 400CIt enters and condenses in the condenser at a pressure of 100kPa. Determine the efficiency of the cycle.What would the efficiency be if the steam entered the turbine at 5MPa pressure and condensed at 90kPa pressure.
A Rankine Cycle operates with 4500 kW of heat added to the boiler while 3300 kW of heat is rejected in the condenser. What is the efficiency of this cycle?
A Carnot vapor power cycle operates
its boiler at 3.0 MPa and its condenser
at 50 kPa. What is the thermal
efficiency of this cycle?
O 40 %
O 30%
O 20 %
O 50 %
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- In an ideal Rankine cycle, steam is generated at 4.1 MPa and 480°C. The condenser is at 32°C. Determine the ideal pump work in KJ/kg.arrow_forwardIn an ideal Rankine cycle, steam is generated at 4.1 MPa and 480°C. The condenser is at 32°C. For an engine with the same end states, determine its mean effective pressure in kPa.arrow_forwardThe net work for a given reheat Rankine cycle is 80MW. Steam at 10 MPa and 500C enters the first turbine and then, the second turbine at 1.2 MPa and 500C. Saturated liquid exits the condenser at 20 kPa. Draw the schematic and T-S diagrams. Label the points by setting point 1 at the condenser outlet, point 2 at the pump outlet, point 3 at the boiler outlet, point 4 at the reheater inlet, point 5 at the reheater outlet, and point 6 at the condenser inlet. Use 2 decimal places for the enthalpy and other energies in solving and for the final answers. For the steam quality (x) and entropy (s), use 4 decimal places in solving. For the specific volume, use 6 decimal places. IMPORTANT: USE THE STEAM TABLES FROM CENGEL'S BOOK ONLY (uploaded already in the files section). Determine the following: Enthalpy at point 2 in kJ/kg = Enthalpy at point 4 in kJ/kg = Enthalpy at point 5 in kJ/kg = Enthalpy at point 6 in kJ/kg = Thermal Efficiency in % = Heat added in kJ/kg = Heat rejected in…arrow_forward
- Calculate the work done in the low-pressure turbine (LPT) of a Rankine cycle with reheat. The steam enters the LPT at 425°C & 60 MPa and leaves LPT as superheated steam at 375°C & 50MPA. Suggest what would be the dryness fraction of the working fluid entering the condenser.arrow_forwardIn a reheat-regenerative Rankine cycle, the condenser pressure is 10 KPa. Steam enters the first turbine at 12.5 MPa and 500 oC. Steam is reheated at 3 MPa at the same temperature before entering the second turbine. For the regeneration, steam is extracted from the second turbine at 0.5 MPa to an open feedwater heater (OFWH). Draw the schematic and T-S diagrams. Label the points by setting point 1 at the condenser outlet, point 2 at the 1st pump (right after the condenser) outlet, point 3 at the OFWH outlet, point 4 at the 2nd pump outlet, point 5 at the boiler outlet, point 6 at the reheater inlet, point 7 at the reheater outlet, point 8 for the extraction of steam to OFWH and point 9 at the condenser inlet. Use 2 decimal places for the enthalpy, steam quality (%), thermal efficiency (%), and other energies. For the fraction of steam (y) and entropy (s), use 4 decimal places. For the specific volume, use 6 decimal places. IMPORTANT: USE THE STEAM TABLES FROM CENGEL'S BOOK ONLY…arrow_forwardA solar-energy-powered ideal Rankine cycle uses water as the working fluid. Saturated vapour leaves the solar collector at 170°C, and the condenser pressure is 10 kPa. Determine the thermal efficiency of this cycle.arrow_forward
- In an ideal reheat-regenerative cycle, steam enters the turbine at 6 MPaa and 400°C. After expansion to 1.4 MPaa steam is withdrawn and reheated to 300°C. Extractions for regenerative heating occur at 0.15 MPaa and 1.4 MPaa and the condenser pressure is 0.01MPaa. Use mass flowrate of 1 kg/s.arrow_forwardA power plant is to be operated on a Rankine Cycle with superheated steam exiting the boiler at 4 MPa and 500°C. The condenser pressure is 20 kPa. Compute the specific steam consumption of the cycle in kg/kWharrow_forwardA power plant is to be operated on a Rankine Cycle with the superheated steam exiting the boiler at 4 MPa and 500°C. The condenser pressure is 20 kPa. Compute for the actual thermal efficiency of the cycle in % if the isentropic efficiencies of the steam turbine and pump are both 83.98%.arrow_forward
- Thermodynamicsarrow_forward12. Refrigerant 134a is used as the working fluid in an OTEC power plant, which utilizes a simple Rankine cycle without superheat. The condenser is at 12°C and the boiling of R-134a occurs at 28°C. The efficiency of the turbine is 76%. What is the thermal efficiency of this cycle and how much heat input is required for the cycle to produce 0.5 MW?arrow_forwardA ideal rankine power plant cycle uses ammonia as the working fluid.Saturated vapor leaves the boiler at a temperature of 85 o C. The condenser temperatureis 40 o C. Calculate the heat transfer to the boiler, the work done by the turbine, and thethermal efficiency of the cycle.arrow_forward
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Power Plant Explained | Working Principles; Author: RealPars;https://www.youtube.com/watch?v=HGVDu1z5YQ8;License: Standard YouTube License, CC-BY