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Second Law of Thermodynamics
Units and Variables
e - thermal efficiency
W - work done by a heat engine, in Joules
COP - coefficient of performance
e
=
1
-
|
Q
c
|
|
Q
h
|
W
=
|
Q
h
|
-
|
Q
c
|
COP (heating)
=
Q
h
W
COP (cooling)
=
|
Q
c
|
W
Carnot Engines
|
Q
c
|
|
Q
h
|
=
T
c
T
h
e
C
=
1
-
T
c
T
h
COP (heating)
=
T
h
ΔT
COP (cooling)
=
T
c
ΔT
e
=
1
-
1
V
1
/
V
2
γ
-
1