In a residential heat pump system the refrigerant rate is 412.2 kg/hr and the electric energy supplied to the compressor is 25,480 kJ/hr. The properties of the refrigerant at the inlet (state 1) and at exit (state 2) of the compressor are as given below:
|
State
|
t
(0C)
|
p
(bars)
|
h
(kJ/kg)
|
s (kJ /kg K)
|
|
1
|
–1
|
2.6
|
226.35
|
0.8636
|
|
2
|
93
|
15.0
|
286.40
|
0.9222
|
Determine the amount of available energy destroyed in the compressor in kJ/hr. All heat transfer, if it occurs, takes places at T0. Assume T0 = 273 K, P0, = 1 atm.