Page 339 - Defrosting for Air Source Heat Pump

334 Defrosting for Air Source Heat Pump

100,000
First cost Running cost
90,000
80,000 75,291.63 75,007.65
71,807.29 71,774.88
70,000
)
Y
N 60,000
C
(
t
s 50,000
o
c 67,291.63 66,992.65 63,657.29 63,609.88
l
a 40,000
t 89.37% 89.31% 88.65% 88.62%
o
T
30,000
20,000
10,000
0
Case D5 Case D6 Case D7 Case D8
Four typical cases
Fig. 10.24 Total costs in the four typical cases over 15 operating years.

80,000
Case D5
70,000
Case D6
Case D7
60,000
Case D8
)
Y 50,000
N
C
(
t 40,000
s 76,000
o Case D5
c 74,000 Case D6
l Case D7
a Case D8
t 30,000 72,000
o )
T Y N 70,000
C
(
t
s
o
c 68,000
20,000 l a t o
T
66,000
64,000
10,000 62,000 D5 > D6 > D7 ≈ D8
13 14 15
Operation time (year)
0
0 2 4 6 8 10 12 14 16
Operation time (year)
Fig. 10.25 Total costs in the four typical cases in the 15 operating years.
valves were installed. In addition, for the running cost in the heating season without
frost formation, from Case D5 to Case D8, the values were 14,936.17 CNY, 14,936.17
CNY, 13,794.8 CNY, and 13,794.8 CNY, respectively. The effects of the water-
collecting trays on defrosting performance did not exist in this operating season.
But the effect of the valves was shown, with the difference of 1141.37 CNY between