Work and Entropy
Engine Efficiency and Refrigerator Coefficient of Performance
Entropy Change for a Carnot Cycle
100

Work

W = Integral (p dV)

100

Engine Efficiency

e = W/QH

100

Entropy Change

∆S = QH/TH + QC/TC= 0

200

Entropy

∆S = integral (dQ/ T)

200

Refrigerator Coefficient of Performance

K = QC/−W

300

S

S = k ln(w)

300

Refrigerator Coefficient of Performance (heat pump in heating mode)

K = −QH/−W (heat pump in heating mode)


M
e
n
u