FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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H.W. 3.7 In a steam power plant develops an output power of (48MW) the steam
enters the high pressure turbine at (70 bar) and (450°C) and leaves it at (10 bar)
and (210°C). The steam is then reheated under constant pressure to (400°C) before
it expands in the low pressure turbine to the condenser pressure of (0.07 bar)and
dryness fraction of (0.93). Neglect the pump work and calculate:
1. The isentropic efficiency of each stage of turbine.
2. The cycle thermal efficiency.
Answers: (1) 87.7%. (2) 36.6%
Hint, find enthalpy, entropy at each state
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- 1. Steam at 14 Mpa and 700°C is received by a regenerative cycle. Before condensation at 70 kPa, steam extracted for feedwater heating at 5 Mpa. On the mass basis of 1 kg of throttle steam, find the thermal efficiency of the engine. PLEASE SHOW COMPLETE SOLUTION (DRAW THE TS DIAGRAM)arrow_forward1. In a steam power plant steam enters the turbine at 6 bar and 400°C and is expanded isentropic ally to the condenser pressure of 0.1 bar. If the isentropic efficiency of the turbine is 80%, find the actual net work output and the thermal efficiency.arrow_forwardSteam is supplied to a two-stage turbine at 48 bar and 400 °C. It expands in the firstturbine until it is just dry saturated, then it is re-heated to 400 °C and expandedthroughthe second-stage turbine. The condenser pressure is 0.04 bar. Determine the specific work output of the system to 3 d.p? what is the specific entalphy in kJ/kg for state 2?arrow_forward
- For each control volume analyzed, the thermodynamics model is the steam tables, the process is SSSF (steady state, steady flow), and the changes in kinetic and potential energies are negligible. Consider a reheat cycle utilizing steam. Steam leaves the boiler and enters the turbine at 4 Mpa, 400°C. After expansion in the turbine to 400 kPa, the steam reheated to 400ºC and then expanded in the low pressure turbine to 10 kPa. Determine the cycle efficiency.arrow_forwardWe need a steam turbine is to generate 10 MW of power. The feed steam is 200 bar at 500 C. The exhaust is a saturated mixture at 1 bar at 110 C. Calculate the flow rate of steam required.arrow_forwardPlease Answer all my Question .. Please help me , I don't want plagiarism.arrow_forward
- Steam at 5.2 MPa, 4000C expands in a Rankine turbine to 0.036MPa. For 136 kg/s of steam, determine the work, the thermal efficiency, and the steam rate (a) fot the cycle(b) for the turbine, (c) for an actual turbine with the same specifications, the brake steam rate is 4.80 kg/kwh ang the driven electric generator has an efficiency of 93%, Find brake thermal efficiency , brake engine efficiency, combined work, and quality or temperature of exhaust steam. Don't answer the given problem, just give me the schematic diagram and T-S diagram of the given problemarrow_forwardH.W. 4.1. Consider a regenerative cycle using steam as the working fluid . Steam leaves the boiler and enters the turbine at 4 MPa, 400 oC. After expansion to 400 kPa, some of the steam is extracted from the turbine for the purpose of heating the feedwater in an open feedwater heater. The pressure in the feedwater heater is 400 kPa and the water leaving it is saturated liquid at 400 kPa. The steam not extracted expands to 10 kPa. Determine the cycle efficiency. Answers: 37.5%arrow_forwardIn order for steam to turn the turbine in the generator of a heat engine, the steam must be Question 9 options: at high volume. at low temperature. under low pressure under high pressure.arrow_forward
- Pleae solve this problem and give an explanation of how you have picked up values from steam tables... Also explain how would we find enthalpy after fluid expansion in first turbinearrow_forwardPlease solve the given problem.arrow_forward2.) An actual Rankine Engine is used to power a generator. The steam enters its turbine at 4 MPa and 300C then expands in an irreversible adiabatic process where it becomes saturated vapor. It enters the condenser with a pressure of 5 kPa. Find Ec, W(W₁, W₁, Wk) the remaining engine efficiencies(n,, na, nx), thermal efficiencies (e₁, 3, ek), SR(SR₁, SR₂, SR), HR(HR, HR, HR) obtained if the turbogenerator has 85% mechanical efficiency and 90% generator efficiency. 2822.88 kg W 27 e SR HR I 399.2 39.08% 14.14% 25456.73 B 339.32 33.22% 12.02% 29949.35 305.39 29.89% 10.82% 33276.96 k kg kj kg kg kWh kg kWh kg kWh 9.02- 10.61 11.79 kWh kj kWharrow_forward
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What is entropy? - Jeff Phillips; Author: TED-Ed;https://www.youtube.com/watch?v=YM-uykVfq_E;License: Standard youtube license