Mini Amazon III Series
10
Repeat Step 3: Select outdoor unit
Determine the required total heat load from the indoor units to the outdoor unit based on either the sum of the
peak loads of each room or the system peak load. In this example, it is determined based on the system peak load.
Therefore, the required heat load is 10.5kW.
Provisionally select an outdoor unit using the sum of the capacity indexes (CIs) of the selected indoor units (as shown
in Table 1-5.5), ensuring that the combination ratio is between 50% and 130%. Refer to Table 1-5.6. As the sum of CIs
of the indoor units is 120. For the 10kW unit is not suitable, try to select 12kW unit.
The number of connected indoor units is 4 and the maximum number of connected indoor units on the 12kW outdoor
unit is 7, so the number of connected indoor units is within the limitation.
Cal
culate the corrected capacity of the outdoor unit:
a)
The sum of the indoor unit CIs is 120 and the CI of the 12kW outdoor unit is 120, so the combination ratio is 120
/ 120 = 100%.
b)
Using the outdoor unit’s cooling capacity table, interpolate to obtain the capacity (“B”) corrected for outdoor air
temperature, indoor air temperature, and combination ratio. Refer to Tables 1-5.8 and 1-5.9.
Table 1-5.8: Extract from Table 2-7.3 KMF-120 DVN4
cooling capacity
Table 1-5.9: Cooling capacity calculated by interpolation
CR
Outdoor air
temp.
(°C DB)
Indoor air temp.
(°C DB / °C WB)
CR
Outdoor air
temp.
(°C DB)
Indoor air temp.
(°C DB / °C WB)
25.8 / 18.0
25.8 / 18.0
TC
PI
TC
PI
kW
kW
kW
kW
100%
31
11.2
2.46
100%
33
11.2
2.63
33
11.2
2.76
35
11.2
2.80
B = 11.2
90%
31
10.1
2.11
90%
33
10.1
2.26
33
10.1
2.37
35
10.1
2.40
c)
Find the correction factor for piping length and level difference (“K1”)
Figure 1-5.4: Mini rate of change in cooling capacity
d)
Calculate the corrected capacity of KMF-120 DVN4 (“C”) by using K1:
C = B × K1 = 11.2 × 0.968 =10.84kW
The corrected capacity 10.84 kW is larger than required total heat load 10.5kW, so selection is complete.
Содержание KMF-100 DVN4
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