Dry saturated steam at 17.5 bar enters the turbine of a steam power plant and expands tothe condenser pressure of 0.75 bar. Determine the Carnot and Rankine cycle efficiencies.Also find the work ratio of the Rankine cycle. [0.2381, 0.873; 0.2162, 0.9967]Steam enters the turbine of a steam power plant, operating on Rankine cycle, at 10 bar, 300°C.The condenser pressure is 0.1 bar. Steam leaving the turbine is 90% dry. Calculate theadiabatic efficiency of the turbine and also the cycle n, neglecting pump work. [0.89, 0.25]In a single-heater regenerative cycle shown in figure 1 below, the steam enters the turbine at30 bar, 400°C and the exhaust pressure is 0.1 bar. The feed water heater is a direct contacttype that operates at 5 bar. Draw a fully labelled T-S and h-S diagrams of this cycle; Determinethe efficiency and steam rate of the cycle.[34.18%; 1.18%; 3.46 Kg/kWh]TurbineBoilerОрenFWHCondenserPump IIPump IConsider a steam power plant operating on the ideal regenerative Rankine cycle with oneopen feedwater heater. Steam enters the turbine at 15 MPa and 600°C and is condensed inthe condenser at a pressure of 10 kPa. Some steam leaves the turbine at a pressure of 1.2MPa and enters the open feedwater heater. Determine the fraction of steam extracted fromthe turbine and the thermal efficiency of the cycle. [0.8041; 46.3%]A 40 mW steam plant working on the Rankine cycle operates between boiler pressure of 4MPa and condenser pressure of 10 KPa. The steam leaves the boiler and enters the steamturbine at 400°C. The isentropic n of the steam turbine is 85%. Determine (i) the cyclen (ii)the quality of steam from the turbine and (iii) the steam flow rate in kg per hour. Consider pumpwork. [29.9%; 0.88; 44.2 kg/s]

Given dataProperties of steam entering turbine17.5 barsaturated steamProperties of steam entering…

Dry saturated steam at 17.5 bar enters the turbine of a steam power plant and expands to the condenser pressure of 0.75 bar. Determine the Carnot and Rankine cycle efficiencies. Also find the work ratio of the Rankine cycle. [0.2381, 0.873; 0.2162, 0.9967]

Dry saturated steam at 17.5 bar enters the turbine of a steam power plant and expands to the condenser pressure of 0.75 bar. Determine the Carnot and Rankine cycle efficiencies. Also find the work ratio of the Rankine cycle. [0.2381, 0.873; 0.2162, 0.9967]

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

Dry saturated steam at 17.5 bar enters the turbine of a steam power plant and expands to
the condenser pressure of 0.75 bar. Determine the Carnot and Rankine cycle efficiencies.
Also find the work ratio of the Rankine cycle. [0.2381, 0.873; 0.2162, 0.9967]
Steam enters the turbine of a steam power plant, operating on Rankine cycle, at 10 bar, 300°C.
The condenser pressure is 0.1 bar. Steam leaving the turbine is 90% dry. Calculate the
adiabatic efficiency of the turbine and also the cycle n, neglecting pump work. [0.89, 0.25]
In a single-heater regenerative cycle shown in figure 1 below, the steam enters the turbine at
30 bar, 400°C and the exhaust pressure is 0.1 bar. The feed water heater is a direct contact
type that operates at 5 bar. Draw a fully labelled T-S and h-S diagrams of this cycle; Determine
the efficiency and steam rate of the cycle.
[34.18%; 1.18%; 3.46 Kg/kWh]
Turbine
Boiler
Орen
FWH
Condenser
Pump II
Pump I
Consider a steam power plant operating on the ideal regenerative Rankine cycle with one
open feedwater heater. Steam enters the turbine at 15 MPa and 600°C and is condensed in
the condenser at a pressure of 10 kPa. Some steam leaves the turbine at a pressure of 1.2
MPa and enters the open feedwater heater. Determine the fraction of steam extracted from
the turbine and the thermal efficiency of the cycle. [0.8041; 46.3%]
A 40 mW steam plant working on the Rankine cycle operates between boiler pressure of 4
MPa and condenser pressure of 10 KPa. The steam leaves the boiler and enters the steam
turbine at 400°C. The isentropic n of the steam turbine is 85%. Determine (i) the cyclen (ii)
the quality of steam from the turbine and (iii) the steam flow rate in kg per hour. Consider pump
work. [29.9%; 0.88; 44.2 kg/s]

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T B A D Consider the cycle in the diagram (very similar to the Rankine Cycle) using water as the working fluid. Process A-B: A saturated mixture of water is pumped from low pressure to a high pressure saturated liquid in an iso-entropic (and adiabatic) process. Process B-C: The high pressure saturated liquid enters a boiler where it is heated at constant pressure process by an external heat source to a super-heated vapor. Process C-D: The super-heated vapor goes through a turbine, generating power exiting as a saturated vapor. Assume an iso-entropic (and adiabatic) process and neglect kinetic energy and potential energy changes. Process D-A: The saturated vapor then enters a condenser where it is condensed at a constant pressure process back to its original state. The boiler operates at 10 MPa (points B & C) and the condenser operates at 100 kPa (points A & D). Assume a mass flow rate of 1 kg/s. a) Make a table of the temperature, pressure, volume, internal energy, enthalpy, entropy…
3. 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. (vii) Using the highest and lowest temperature values in the cycle, recalculate the efficiency of the cycle and show that it is equivalent to the result in part (vi). (viii) Calculate the thermal efficiency of the power station if the isentropic efficiency of the steam turbine is 94%. (ix) State main disadvantages of using the Carnot cycle as the basis for a power station. (x) State the name of the cycle that is used in practice in power stations, along with three key benefits over the Carnot cycle.
A steam power plant working on Rankine cycle has the range of operation from 40 bar dry saturated to 1.2 bar. Draw the T-s and h-s diagrams and determine the following: (i) Steam quality at turbine exit (ii) Cycle efficiency (iii) Work ratio (iv) Steam rate
A generator uses a gas turbine cycle. Air enters the compressor at a pressure of 1 bar and a temperature of 30°C with a compressor efficiency of 0.85. Hot gas exits the combustion chamber at a pressure of 9 bar and a temperature of 900°C. The power generated by the turbine is 2400 kW with a turbine efficiency of 0.82. a. Draw installation diagrams and T-s cycle process diagramd b. Determine the work of the compressor and turbine and the mass rate of the air requirement c. Cycle thermal efficiency (air: Cp=1,005 kJ/kg. K dan γ=1.4; Gas hot: cp=1,005 kJ/kg K and γ=1.4)