PASCO TD-8564 THERMAL EFFICIENCY APPARATUS - Manual (Page 23)

012-05443A Thermal Efficiency Apparatus
19
Questions
➀ If the difference between the temperature of the hot side and the cold side was decreased,
would the maximum COP increase or decrease?
➁ Calculate the rate of change in entropy for the system which includes the hot and cold
reservoirs. Since the reservoirs are at constant temperature, the rate of change in entropy is
∆
S
∆
t
=
∆
Q /
∆
t
T
=
P
T
for each reservoir. Is the total change in entropy positive or negative? Why?
T
H
(k
Ω
) T
C
(k
Ω
) T
H
(K) T
C
(K) V
W
I
W
P
W
actual max adj % diff
COP COP COP
Table 3.1 Heat Pump Data and Results