Outdoor Units
Heat pump 60Hz/R410A
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11
1. DC Inverter SINGLE ZONE
SINGLE ZONE
1.8 Capacity coefficient factor
1) Rate of change in capacity due to the Main piping length
5(16.4)
10(32.8) 15(49.2) 20(65.6) 30(98.4) 40(131.2) 50(164.0) 60(196.9) 70(229.7) 75(246.0)
24k 100 99.3 97.9 96.6 93.8 91.1 88.4 - - -
42k 100 99.3 97.9 96.6 93.8 91.1 88.4 85.6 82.9 81.5
Piping length(m(ft))
Rate of change
in capacity(%)
Rate of change in cooling capacity
24k 100 99.7 99.2 98.7 97.7 96.6 95.6 - - -
42k 100 99.7 99.2 98.7 97.7 96.6 95.6 94.6 93.5 93
Piping length(m(ft))
Rate of change
in capacity(%)
Rate of change in heating capacity
①
Outdoor unit standard maximum capacity
Q
rated
[from specification table]
②
Outdoor unit capacity at Ti, To temperature.
Q
(Ti, To)
[from capacity table]
③
Outdoor unit capacity coefficient factor
F
(Ti, To)
= Q
(Ti, To)
/ Q
rated
④
Piping correction factor
F
piping
for piping length [from capacity coefficient factor table]
⑤
Indoor Unit actual capacity
Q
actual
= Q
rated
x F
(Ti, To)
x F
piping
Example)
2) Calculation of actual system capacity
• Outdoor unit model : AUUW24GD2 [LUU247HV]
• Indoor units (ATNH24GPLE2 [LCN247HV])
• Outdoor temperature : 104℉DB
• Indoor temperature: 66.2 ℉WB
• Piping length (ODU to IDU):49.2 ft
• Indoor unit actual cooling capacity in A room?
- Q
rated
: 24,000 Btu/h
- Q
(Ti, To)
: 23,160 Btu/h
- F
(Ti, To)
: 23.16 / 24.0 = 96.5%
- F
piping
= 97.9%
- Q
actual
= 24,000 x 0.965 x 0.979 = 22,673.6 Btu/h
5(16.4)
10(32.8) 15(49.2) 20(65.6) 30(98.4) 40(131.2) 50(164.0) 60(196.9) 70(229.7) 75(246.0)
