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The hot and cold reservoirs of a Carnot engine are 273°C and 71.7°C respectively. The temperature...

The hot and cold reservoirs of a Carnot engine are 273°C and 71.7°C respectively. The temperature of the hot reservoir is raised by 43°C in order to increase the efficiency of the engine. (a) What is the efficiency after the increase in temperature? .41 Incorrect: Your answer is incorrect. % (b) Instead of raising the temperature of the hot reservoir, if the temperature of the cold reservoir is decreased by 43°C, what would be the efficiency of the engine? %

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Homework Answers

Answer #1

a)

Temperature of hot reservoir is

T h= 273+43 =316oC

in Kelvin

T=316+273.15=589.15 K

Temperature of Cold reservoir is

Tc = 273.15+71.7 =344.85 K

The carnot efficiency is given by

in percentage is

%

b)

Now

Temperature of hot reservoir is

T h= 273+273.15 =546.15 K

Temperature of Cold reservoir is

Tc = 344.85 -43 =301.85 K

Therefore

%

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