Isothermal process on p-V, T-V, and p-T diagrams
Isothermal process on p-V, T-V, and p-T diagrams
Isothermal process on p-V, T-V, and p-T diagrams
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p<br />
a<br />
Q in<br />
W < 0<br />
Q out<br />
For a refrigerator, the<br />
cycle is always<br />
counterclockwise.<br />
Expansi<strong>on</strong> happens at<br />
low pressure,<br />
compressi<strong>on</strong> at high<br />
pressure <strong>and</strong> this takes<br />
work. Heat is drawn in at<br />
T C <strong>and</strong> expelled at T H .<br />
c<br />
V<br />
Refrigerators (heat pumps)<br />
Q C = Q in<br />
Q H = Q out<br />
W in = –W<br />
PHYS 1101, Winter 2009, Prof. Clarke 37<br />
p<br />
a<br />
S 1<br />
T C<br />
S2 Qout d<br />
adiabats<br />
b<br />
isotherms<br />
T H<br />
Q in<br />
c<br />
V<br />
As for an engine, the most<br />
optimal thermodynamical<br />
cycle for a refrigerator is the<br />
Carnot cycle traversed in<br />
the counterclockwise<br />
directi<strong>on</strong> (opposite to the<br />
engine).