Question
In: Mechanical Engineering
Steam leaves the boiler of a 100 MW Rankine cycle power plant at 400°C and 3.5MPa....
Steam leaves the boiler of a 100 MW Rankine cycle power plant at 400°C and 3.5MPa. The Turbine has an isentropic efficiency of 85% and exhausts at 15 kPa. In the condenser, the water is subcooled to 38°C by lake water at 13°C. The pump isentropic efficiency is 75% Draw and label the T-s diagram (4 points) for this cycle and determine: 1. The cycle’s thermal efficiency (7 points) 2. The mass flow rate of the steam in the boiler (kg/h) (7 points) 3. The back-work ratio (5 points) 4. The minimum required cooling water flow rate if regulations limit the cooling water temperature rise to 10°C (kg/h) (7 points)
Solutions
samet mamat answered 1 year agoRelated Solutions
Steam leaves the boiler of a 100 MW Rankine cycle power plant at 400°C and 3.5MPa....
Steam leaves the boiler of a 100 MW Rankine cycle power plant at
400°C and 3.5MPa. The Turbine has an isentropic efficiency of 85%
and exhausts at 15 kPa. In the condenser, the water is subcooled to
38°C by lake water at 13°C. The pump isentropic efficiency is
75%.
1. Draw and label the T-s diagram for this cycle
2. Determine the cycle’s thermal efficiency
3. Determine the mass flow rate of the steam in the boiler
(kg/h)
4. Determine...
A Rankine cycle with reheat produces 1 MW of net power. The boiler operates at 15...
A Rankine cycle with reheat produces 1 MW of net power. The
boiler operates at 15 MPa and has an outlet temperature of 800 K.
The condenser operates at atmospheric pressure (1 atm). The
operating point of this cycle is such that the water exiting the
low pressure turbine has no liquid present to prevent damageto the
turbine (hint: what does this say about quality at this point?).
Assume the pump and second turbine stage are both isentropic, but
the...
A steam power plant operates on a practical Rankine Cycle. The steam enters the turbine at...
A steam power plant operates on a practical Rankine Cycle. The
steam enters the turbine at 3 MPa and “648” K and is condensed in
the condenser at a pressure of 46 kPa. You are assigned on a
project to improve the thermal efficiency of this plant. a) Draw
the schematic of the plant and determine the thermal efficiency of
the practical cycle assuming that the efficiencies of pump and
turbine are 0.75 and 0.7, respectively. ( b) Draw a...
Consider a steam power plant operating on a simple ideal Rankine cycle in which the steam...
Consider a steam power plant operating on a simple ideal Rankine
cycle in which the steam enters the turbine at 3 MPa and 350C and
is condensed in the condenser at 75 kPa. Determine the thermal
efficiency of this cycle and sketch an appropriately labeled T-s
diagram. Also compare this thermal efficiency to that a Carnot heat
engine operating between these same two limits.
The change in enthalpy across the pump = work done by the pump:
h2-h1= v1(P2– P1)
A steam power plant operates on the simple ideal rankine cycle. the steam enters the turbine...
A
steam power plant operates on the simple ideal rankine cycle. the
steam enters the turbine at 4 MPa and 500 C and leaves it at 50 kPa
and 150 C. the water leaves the condenser as a saturated liquid and
is subsequently displaced to the boiler by means of a pump at a
temperature of 85 C, which is the isentrophic efficiency of the
turbine?
A steam power plant operates on a regenerative Rankine cycle. Steam enters the turbine at 6...
A steam power plant operates on a regenerative Rankine cycle.
Steam enters the turbine at 6 MPa at 700 ºC and the condenser at 10
kPa. Turbine has isentropic efficiency of 85% and pumps have
isentropic efficiency of 90%. Steam is extracted from the turbine
at 0.6 MPa to heat the feedwater in an open feedwater heater. Water
leaves the open feedwater heater as saturated liquid.
a) Draw the system with labels and show the ideal and the
non-ideal cycle...
Steam at 32 MPa, 520◦C leaves the steam generator of an ideal Rankine cycle modified to...
Steam at 32 MPa, 520◦C leaves the steam generator of an ideal
Rankine cycle modified to include three turbine
stages with reheat between the stages. The reheat pressures are
4 and 0.5 MPa, respectively, and steam enters the second-
stage turbine at 440◦C and the third-stage turbine at 360◦C. The
condenser pressure is 0.08 bar. Determine for the cycle
a) The net work per unit mass of steam flowing, in kJ/kg.
b) The thermal efficiency.
a.) What is the thermal efficiency of a steam power plant operating on the Rankine cycle...
a.) What is the thermal efficiency of a steam power plant
operating on the Rankine cycle if saturated steam is supplied to
the turbine at 1000 psia, and the condenser is at 1 psia. Use a
turbine efficiency of 95% and a pump efficiency of 85%. Refer to
Chapter 9, Sections 10-11, as necessary.
b.) Determine the thermal efficiency if the steam is superheated to
1000 F, assuming all else equal.
The net power of a steam power plant operating according to the simple ideal Rankine cycle...
The net power of a steam power plant operating according to the
simple ideal Rankine cycle is 30.5 MW. Water vapor enters the
turbine at 7 MPa pressure and 500 ° C, expands to 10 kPa condenser
pressure in the turbine. The steam is condensed in the condenser by
cooling it with water from a lake. The flow rate of the lake water
is 1950 kg / h. Get the pump and turbine adiabatic efficiency of
87%. Show the cycle...
Consider a steam power plant operating on the simple ideal Rankine cycle. Steam enters the turbine...
Consider a steam power plant operating on the simple ideal
Rankine cycle. Steam enters the turbine at 15 MPa and 600°C. The
steam condenses in the condenser at 10 kPa. Use the EES software to
study the effects of the following cases on the cycle performance
and to sketch the T-s diagram for each case:
Plot the variation of the cycle thermal efficiency with the
turbine isentropic efficiency. Take the isentropic efficiency of
the turbine in the range 70% to...
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