what is the solution to these problems? 1.A heat engine operates between two res
ID: 1672942 • Letter: W
Question
what is the solution to these problems? 1.A heat engine operates between two reservoirs attemperatures of 18°C and304°C. What is the maximumefficiency possible for this engine?% A steam engine has a boiler that operates at 305°F, and the temperature of the exhaust is130°F. Find the maximum efficiencyof this engine.
% What is the change in entropy of 4.0 kg of liquid water at 100°C as it changesto steam at 100°C?
J/K
what is the solution to these problems? 1.A heat engine operates between two reservoirs attemperatures of 18°C and304°C. What is the maximumefficiency possible for this engine?
% A steam engine has a boiler that operates at 305°F, and the temperature of the exhaust is130°F. Find the maximum efficiencyof this engine.
% What is the change in entropy of 4.0 kg of liquid water at 100°C as it changesto steam at 100°C?
J/K
Explanation / Answer
(1).Given T ‘ = 18 oC = 18 + 273 = 291 K
T =304 oC = 304 + 273 = 577 K
Maximum efficiency n = 1-( T ‘ / T )
= 0.4956= 49.56 %
(2). Given F = 305 oF
We know ( F-32) / 180 = ( T-273) / 100
(305-32) / 180 = ( T -273 ) / 100
T-273 = 151.6666
T = 424.666 K
Anf F ‘ = 130 oF
(130-32) / 180 = ( T ‘ – 273 ) / 100
T ‘ = 327.44 K
So, maximum effiecncy n ‘ = 1-( T ‘ / T )
=0.2289 = 22.89 %
(3).. mass m = 4 kg
Chang ein entropy ds = mL / T
Where T =100 oC = 373 K
L = latent heat of vaporization = 540 *4186 J / kg
Plug th values wegt dS = 24240.6 J / K
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