Page 337 - Defrosting for Air Source Heat Pump

332 Defrosting for Air Source Heat Pump

1600
Heating season with frost formation
1500 Heating season without frost formation

1400
1416.76 169.35
) 1396.83
Y 1300
N
C
(
t
s 1200 1250.57 1247.41
o
c
g
n
i 1100
n
n
u 76.09
R
1000
995.74 995.74
900
919.65 919.65
800
Case D5 Case D6 Case D7 Case D8
Four typical cases
Fig. 10.20 Running costs in two heating seasons over an operating year.
1600
Electricity cost on frosting
Total running cost
1500
)
Y 169.35
N
C 1400
( 1416.76
t
s 1396.83
o
c
g
n 127.00
i 1300
n
n
u
R 1284.15 1284.15
1250.57 1247.41
1200
1157.14 1157.14
1100
Case D5 Case D6 Case D7 Case D8
Four typical cases
Fig. 10.21 Running costs at the frosting stage in the four defrosting cases over 1 year.
was only 13,500–15,750 h, and that in the heating season without frost formation was
the shortest, at 10,800 h. In the four typical cases, the running costs in their cooling
seasons are the same at 31,104 CNY. This is because the effects the valves have on the
system COP in this operating season were neglected. For the running cost in the
heating season with frost formation, the differences in the four typical cases were