Page 325 - Defrosting for Air Source Heat Pump

320 Defrosting for Air Source Heat Pump

120,000
First cost
110,000
Running cost in heating seasons
100,000 Running cost in cooling season
90,000
80,000 77,469.29
) 72,291.30
Y 70,000
N
C
( 60,000
t
s )
o %
c 50,000 7
l 6
a . 53,917.29 48,589.30
t 9
o 40,000 8
T ( (69.60%) (67.21%)
30,000 9 2 64,141.3 (88.73%)
.
9
20,000 6 4
,
9
10,000 6
15,552 (20.08%) 15,552 (21.51%)
0
Case D3 Case D4
Two typical cases
Fig. 10.10 Accumulated total costs in two cases in the 15 operating years.
90,000
80,000 Case D3 77,469.29
Case D4
70,000 Case D3 (Practical) 71,747.93
Case D4 (Practical)
) 60,000
Y 54,312.86
N
C
( 50,000
t 50,910.84
s
o
c
l 40,000
a
t 31,156.43
o
T
30,000 )
%
29,530.42 2
20,000 2 . 5
( 3402.02 (6.26%) 5178.03 (6.68%)
1
10,000 Case D3 > D4 0 . 6
2
6
0 1
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
System operating duration (year)
Fig. 10.11 Total costs in two cases in the 15 operating years.
which is about 7.64% of the $3359.26 in Case D3. Also, the economic performance of
the new ASHP unit with valves installed was improved in this season. It is obvious that
the difference value and ratio in this season were both less than those in the heating
season with frost formation. This reflects that the effects of valves on the economic
performance of an ASHP unit in heating season with frost formation were higher than