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Cyclic processes and their effeciency, Carnot cycle The Carnot cycle markscheme.docx
The Carnot Cycle (Mark Scheme)
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|
Parts |
Isoprocesses |
Q |
∆T |
Description |
|
a - b |
Isothermal expansion |
W |
0 |
The gas is first expanded isothermally, with the addition of heat QH, along the path “ab” at temperature TL. |
|
b - c |
Adiabatic expansion |
0 |
- |
Next, the gas expands adiabatically from “b” to “c” – no heat is exchanged, but the temperature drops to TL. |
|
c - d |
Isothermal compression |
W |
0 |
The gas is compressed at constant temperature TL, path “cd”, and heat QL flows out. |
|
d - a |
Adiabatic compression |
0 |
+ |
Finally, the gas is compressed adiabatically, path “da”, back to its original state. |
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