Page 340 - Defrosting for Air Source Heat Pump

Technoeconomic performances 335

4000
3516.75 D5–D8 D6–D7
3500
3000 3200.36
)
Y
N 2500 2289.50
C
(
e
c 2000
n 2088.58
e
r
e
f 1500
f
i
d 1062.25
t
s
o 1000
c
l 976.78
a
t
o 500
T
0 0.65
–500
–2 0 2 4 6 8 10 12 14 16
Operating time (year)
Fig. 10.26 Total cost differences between the four cases in the 15 operating years.
100
Case D5
90
Case D6
)
% Case D7
( 80

t Case D8
s
o
c 70

l
a
t
o
t 60

n
i 1.9

t
s 50
o
c
2.9
t
s 40 D8 ≈ D7 > D6 ≈ D5
r
i
f
4.5
f
o 30

n
o
i 7.6
t
r 20
o
p 15.0
o
r 10
P
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Operating time (year)
Fig. 10.27 Proportion of the first cost in the total cost in the 15 operating years.
Cases D5 and D8. It was demonstrated that the running cost of the new ASHP unit in
the heating season without frost formation could decrease by as much as 7.64%.
Therefore, after optimizing the ASHP unit with trays and/or valves, its economic per-
formance would be better.