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xinlan
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Homework Statement
We have stressed that the Carnot engine does not exist in real life: It is a purely theoretical device, useful for understanding the limitations of heat engines. Real engines never operate on the Carnot cycle; their efficiency is hence lower than that of the Carnot engine. However, no attempts to build a Carnot engine are being made. Why is that?
a. A Carnot engine would generate too much thermal pollution.
b. Building the Carnot engine is possible but is too expensive.
c. The Carnot engine has zero power.
d. The Carnot engine has too low an efficiency.
and also,
A real heat engine operates between temperatures Tc and Th. During a certain time, an amount Qc of heat is released to the cold reservoir. During that time, what is the maximum amount of work (Wmax) that the engine might have performed?
Homework Equations
for question 2.
Wmax = eff*Qc
The Attempt at a Solution
for question 1.
I think (d) and (c) are not correct, because carnot engine was made because its efficiency can reach up to 100%. That's why it is an ideal engine. so, it also can't have 0 power.
then I don't know the answer is (a) or (b) ..
for question 2.
I calculated but I got wrong
here is the calculation:
Wmax = ((Th-Tc)/Th)*Qc
Please help me..
thank you