Heat Pump Cycle
The shown figure describes a heat pump cycle using R-12a and its associated enthalpies. What is the coefficient of performance (COP)?
Expand Hint
For a heat pump cycle, the coefficient of performance is:
$$$COP_{hp}=\frac{h_2-h_3}{h_2-h_1}$$$
where
$$h$$
is the enthalpy.
Hint 2
For heat pumps and refrigeration cycles,
$$h_4=h_3$$
.
For a heat pump cycle, the coefficient of performance is:
$$$COP_{hp}=\frac{h_2-h_3}{h_2-h_1}$$$
where
$$h$$
is the enthalpy.
For heat pumps and refrigeration cycles,
$$h_4=h_3$$
. Thus,
$$$COP_{hp}=\frac{(450-300)}{(450-425)}\cdot \frac{kJ/kg}{kJ/kg}=\frac{150}{250}=6$$$
6
Time Analysis
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