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Steam is supplied to a turbine at pressure 11 bar with a dryness fraction d The steam is expanded isentropically to pressure 0.07 bar. Calculate the fol (a) Heat supplied (b) Total change in entropy (c) Heat rejected (d) The thermal efficiency.?
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Steam is supplied to a turbine at pressure 11 bar with a dryness fract...
Given data:
Inlet pressure of steam (P1) = 11 bar
Dryness fraction of steam (d) = ?
Outlet pressure of steam (P2) = 0.07 bar
(a) Heat Supplied:
The heat supplied to the turbine can be calculated by using the equation:
h1 = hf + d * (hfg)
where,
hf = Enthalpy of saturated liquid at inlet pressure
hfg = Enthalpy of vaporization at inlet pressure
From steam tables, at 11 bar:
hf = 727.64 kJ/kg
hfg = 1936.8 kJ/kg
Therefore, h1 = 727.64 + d * 1936.8 kJ/kg
(b) Total Change in Entropy:
As the process is isentropic, the total change in entropy (ΔS) can be calculated by using the equation:
ΔS = s2 - s1
where,
s1 = Entropy of steam at inlet pressure
s2 = Entropy of steam at outlet pressure
From steam tables, at 11 bar:
s1 = 6.333 kJ/kg.K
From steam tables, at 0.07 bar:
s2 = 7.417 kJ/kg.K
Therefore, ΔS = 7.417 - 6.333 kJ/kg.K
(c) Heat Rejected:
The heat rejected by the turbine can be calculated by using the equation:
Qr = h1 - h2
where,
h2 = Enthalpy of steam at outlet pressure
From steam tables, at 0.07 bar:
h2 = 2507.2 kJ/kg
Therefore, Qr = h1 - h2 kJ/kg
(d) Thermal Efficiency:
The thermal efficiency (η) of the turbine can be calculated by using the equation:
η = (Wt / Qs) * 100%
where,
Wt = Work done by the turbine
Qs = Heat supplied to the turbine
The work done by the turbine can be calculated by using the equation:
Wt = h1 - h2
From the above calculations,
Qs = h1 - hf kJ/kg
Wt = h1 - h2 kJ/kg
Therefore, η = [(h1 - h2) / (h1 - hf)] * 100%
Note: The above calculations assume ideal conditions and do not take into account any losses that may occur in the turbine.
Inlet pressure of steam (P1) = 11 bar
Dryness fraction of steam (d) = ?
Outlet pressure of steam (P2) = 0.07 bar
(a) Heat Supplied:
The heat supplied to the turbine can be calculated by using the equation:
h1 = hf + d * (hfg)
where,
hf = Enthalpy of saturated liquid at inlet pressure
hfg = Enthalpy of vaporization at inlet pressure
From steam tables, at 11 bar:
hf = 727.64 kJ/kg
hfg = 1936.8 kJ/kg
Therefore, h1 = 727.64 + d * 1936.8 kJ/kg
(b) Total Change in Entropy:
As the process is isentropic, the total change in entropy (ΔS) can be calculated by using the equation:
ΔS = s2 - s1
where,
s1 = Entropy of steam at inlet pressure
s2 = Entropy of steam at outlet pressure
From steam tables, at 11 bar:
s1 = 6.333 kJ/kg.K
From steam tables, at 0.07 bar:
s2 = 7.417 kJ/kg.K
Therefore, ΔS = 7.417 - 6.333 kJ/kg.K
(c) Heat Rejected:
The heat rejected by the turbine can be calculated by using the equation:
Qr = h1 - h2
where,
h2 = Enthalpy of steam at outlet pressure
From steam tables, at 0.07 bar:
h2 = 2507.2 kJ/kg
Therefore, Qr = h1 - h2 kJ/kg
(d) Thermal Efficiency:
The thermal efficiency (η) of the turbine can be calculated by using the equation:
η = (Wt / Qs) * 100%
where,
Wt = Work done by the turbine
Qs = Heat supplied to the turbine
The work done by the turbine can be calculated by using the equation:
Wt = h1 - h2
From the above calculations,
Qs = h1 - hf kJ/kg
Wt = h1 - h2 kJ/kg
Therefore, η = [(h1 - h2) / (h1 - hf)] * 100%
Note: The above calculations assume ideal conditions and do not take into account any losses that may occur in the turbine.
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Steam is supplied to a turbine at pressure 11 bar with a dryness fraction d The steam is expanded isentropically to pressure 0.07 bar. Calculate the fol (a) Heat supplied (b) Total change in entropy (c) Heat rejected (d) The thermal efficiency.?
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Steam is supplied to a turbine at pressure 11 bar with a dryness fraction d The steam is expanded isentropically to pressure 0.07 bar. Calculate the fol (a) Heat supplied (b) Total change in entropy (c) Heat rejected (d) The thermal efficiency.? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Steam is supplied to a turbine at pressure 11 bar with a dryness fraction d The steam is expanded isentropically to pressure 0.07 bar. Calculate the fol (a) Heat supplied (b) Total change in entropy (c) Heat rejected (d) The thermal efficiency.? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Steam is supplied to a turbine at pressure 11 bar with a dryness fraction d The steam is expanded isentropically to pressure 0.07 bar. Calculate the fol (a) Heat supplied (b) Total change in entropy (c) Heat rejected (d) The thermal efficiency.?.
Steam is supplied to a turbine at pressure 11 bar with a dryness fraction d The steam is expanded isentropically to pressure 0.07 bar. Calculate the fol (a) Heat supplied (b) Total change in entropy (c) Heat rejected (d) The thermal efficiency.? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Steam is supplied to a turbine at pressure 11 bar with a dryness fraction d The steam is expanded isentropically to pressure 0.07 bar. Calculate the fol (a) Heat supplied (b) Total change in entropy (c) Heat rejected (d) The thermal efficiency.? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Steam is supplied to a turbine at pressure 11 bar with a dryness fraction d The steam is expanded isentropically to pressure 0.07 bar. Calculate the fol (a) Heat supplied (b) Total change in entropy (c) Heat rejected (d) The thermal efficiency.?.
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