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Thermodynamics system, properties, Quasi-static process, laws of thermodynamics and concept of entropy
Typology: Study notes
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=
(^)
=
(^) α α
Pulley Thermometer Pulley
Z
W
Water Adiabatic vessel
Paddle
1
2 W (^) 1-2(In)
Q (^) 2-1(out)
V
P
Σ (^) (^) = Σ
Engine E
Q
Heat source
Q = W
W
Heat source TH
QH
Engine E
Heat sink T 2
Q 2
A Possible Engine
W = Q (^) H – Q 2
An Impossible Engine
High temperature sink
Heat Pump or Refrigerator
W=
System boundary
Low temperature source
Impossible
γ −
− = (^) −
^
η = (^) −
^
− η =
η = − = − = − =
Hot reservoir T 1
Reversible engine h=60%
100 kJ (^) 80 kJ
Irreversible energy =15% assumed
h
Cold reservior
40 kJ
(assumed) 20 kJ
Reversible engine
Irreversible energy
Cold reservoir T 2
40 kJ 25 kJ
100kJ
H =60 KJ w = 15 kJ
= (^) ∫ =
T 1
T
T 2
0
2
S1 S
1
S
η =
=