Heat Engines
– Concept of heat engine, and schematic drawing.
– Important quantities: Definitions of Th,
Tc (need for a heat engine to operate
at two different
temperatures), Qh, Qc,
W.
– Efficiency of a heat engine: Definition and
maximum value it can have,
e:= W/Qh , e ≤ 1 – Tc/Th . The Carnot Engine
– Concept of Carnot engine: Different parts of the cycle, efficiency.
– Be able to calculate work, entropy change, and energy change
for each part of the cycle.
Refrigerators
– Concept of heat engine, and schematic drawing.
– Important quantities: Same as for a heat engine, but difference in meaning/signs.
– Coefficient of performance of a refrigerator: Definition and
maximum value it can have,
COP:= Qh/W
, COP ≤ Tc/(Th –
Tc) .
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