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A 2-stroke oil engine has bore pf 20 cm, stroke 30 cm, speed 350 r. p. m, i. m. e. p 275 kN/m2, net brake load 610 N, diameter of brake drum 1m,oil consumption 4.25 kg/hr, calorific value of fuel 44. 103 kj/kg. The indicated thermal efficiency will be?
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A 2-stroke oil engine has bore pf 20 cm, stroke 30 cm, speed 350 r. p....
Indicated Thermal Efficiency of a 2-Stroke Oil Engine
Given data:
Bore (d) = 20 cm
Stroke (l) = 30 cm
Speed (N) = 350 r.p.m
IMEP (p) = 275 kN/m2
Net Brake Load (Pb) = 610 N
Diameter of Brake Drum (D) = 1 m
Oil Consumption (m) = 4.25 kg/hr
Calorific Value of Fuel (CV) = 44.103 kJ/kg
Formula:
Indicated Thermal Efficiency (ηi) = Pb x LHV / m x CV x 3600
where, LHV is the Lower Heating Value of fuel
Calculation:
The stroke length in metres (L) is:
L = l / 100
L = 30 / 100
L = 0.3 m
The swept volume (Vs) is:
Vs = π/4 x d2 x L
Vs = 3.14/4 x (0.2)2 x 0.3
Vs = 0.0188 m3
The engine displacement (Vd) is:
Vd = Vs x N / 2
Vd = 0.0188 x 350 / 2
Vd = 3.29 m3/min
The mass of fuel burned per minute (mf) is:
mf = m / 60
mf = 4.25 / 60
mf = 0.071 kg/min
The Brake Mean Effective Pressure (BMEP) is:
BMEP = Pb x 2π x L x N / 60 x d2
BMEP = 275 x 2π x 0.3 x 350 / 60 x (0.2)2
BMEP = 1955.76 kPa
The Brake Power (P) is:
P = Pb x 2π x N x D x Pb / 60 x 1000
P = 610 x 2π x 350 x 1 / 60 x 1000
P = 11.96 kW
The Lower Heating Value (LHV) is:
LHV = CV - 2440 x (0.065 + 0.008 x (CV / 44.7))
LHV = 44.103 - 2440 x (0.065 + 0.008 x (44.103 / 44.7))
LHV = 41.477 MJ/kg
Now, putting all the values in the formula for Indicated Thermal Efficiency:
ηi = Pb x LHV / m x CV x 3600
ηi = 610 x 41.477 x 1000 / 0.071 x 44.103 x 3600
ηi = 31.93%
Therefore, the indicated thermal efficiency of the 2-stroke oil engine is 31.93%.
Given data:
Bore (d) = 20 cm
Stroke (l) = 30 cm
Speed (N) = 350 r.p.m
IMEP (p) = 275 kN/m2
Net Brake Load (Pb) = 610 N
Diameter of Brake Drum (D) = 1 m
Oil Consumption (m) = 4.25 kg/hr
Calorific Value of Fuel (CV) = 44.103 kJ/kg
Formula:
Indicated Thermal Efficiency (ηi) = Pb x LHV / m x CV x 3600
where, LHV is the Lower Heating Value of fuel
Calculation:
The stroke length in metres (L) is:
L = l / 100
L = 30 / 100
L = 0.3 m
The swept volume (Vs) is:
Vs = π/4 x d2 x L
Vs = 3.14/4 x (0.2)2 x 0.3
Vs = 0.0188 m3
The engine displacement (Vd) is:
Vd = Vs x N / 2
Vd = 0.0188 x 350 / 2
Vd = 3.29 m3/min
The mass of fuel burned per minute (mf) is:
mf = m / 60
mf = 4.25 / 60
mf = 0.071 kg/min
The Brake Mean Effective Pressure (BMEP) is:
BMEP = Pb x 2π x L x N / 60 x d2
BMEP = 275 x 2π x 0.3 x 350 / 60 x (0.2)2
BMEP = 1955.76 kPa
The Brake Power (P) is:
P = Pb x 2π x N x D x Pb / 60 x 1000
P = 610 x 2π x 350 x 1 / 60 x 1000
P = 11.96 kW
The Lower Heating Value (LHV) is:
LHV = CV - 2440 x (0.065 + 0.008 x (CV / 44.7))
LHV = 44.103 - 2440 x (0.065 + 0.008 x (44.103 / 44.7))
LHV = 41.477 MJ/kg
Now, putting all the values in the formula for Indicated Thermal Efficiency:
ηi = Pb x LHV / m x CV x 3600
ηi = 610 x 41.477 x 1000 / 0.071 x 44.103 x 3600
ηi = 31.93%
Therefore, the indicated thermal efficiency of the 2-stroke oil engine is 31.93%.
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A 2-stroke oil engine has bore pf 20 cm, stroke 30 cm, speed 350 r. p. m, i. m. e. p 275 kN/m2, net brake load 610 N, diameter of brake drum 1m,oil consumption 4.25 kg/hr, calorific value of fuel 44. 103 kj/kg. The indicated thermal efficiency will be?
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A 2-stroke oil engine has bore pf 20 cm, stroke 30 cm, speed 350 r. p. m, i. m. e. p 275 kN/m2, net brake load 610 N, diameter of brake drum 1m,oil consumption 4.25 kg/hr, calorific value of fuel 44. 103 kj/kg. The indicated thermal efficiency will be? 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 A 2-stroke oil engine has bore pf 20 cm, stroke 30 cm, speed 350 r. p. m, i. m. e. p 275 kN/m2, net brake load 610 N, diameter of brake drum 1m,oil consumption 4.25 kg/hr, calorific value of fuel 44. 103 kj/kg. The indicated thermal efficiency will be? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 2-stroke oil engine has bore pf 20 cm, stroke 30 cm, speed 350 r. p. m, i. m. e. p 275 kN/m2, net brake load 610 N, diameter of brake drum 1m,oil consumption 4.25 kg/hr, calorific value of fuel 44. 103 kj/kg. The indicated thermal efficiency will be?.
A 2-stroke oil engine has bore pf 20 cm, stroke 30 cm, speed 350 r. p. m, i. m. e. p 275 kN/m2, net brake load 610 N, diameter of brake drum 1m,oil consumption 4.25 kg/hr, calorific value of fuel 44. 103 kj/kg. The indicated thermal efficiency will be? 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 A 2-stroke oil engine has bore pf 20 cm, stroke 30 cm, speed 350 r. p. m, i. m. e. p 275 kN/m2, net brake load 610 N, diameter of brake drum 1m,oil consumption 4.25 kg/hr, calorific value of fuel 44. 103 kj/kg. The indicated thermal efficiency will be? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 2-stroke oil engine has bore pf 20 cm, stroke 30 cm, speed 350 r. p. m, i. m. e. p 275 kN/m2, net brake load 610 N, diameter of brake drum 1m,oil consumption 4.25 kg/hr, calorific value of fuel 44. 103 kj/kg. The indicated thermal efficiency will be?.
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