8. Operation Range
36
Defrosting correction factor
The heating capacity tables do not take account of the reduction in capacity, when frost has accumulated or while
the defrosting operation is in progress.
The capacity values, which take these factors into account, in other words, the integrated heating capacity values,
can be calculated as follows :
Formula : A = B × C
Integrated heating capacity = A
Value given in table of capacity characteristics = B
Integrating correction factor for frost accumulation (kW) = C
Outdoor temperature (°C, DB/WB)
-10/-10.4
-8/-8.5 -6/-6.5 -4/-4.6 -2/-2.7 0/-0.7 2/1.2 5/4.1 7/6
Capacity coefficient 0.99 0.98 0.96 0.95 0.91 0.88 0.86 0.91 1.00
1.05
1.00
0.95
0.90
0.85
0.80
0.75
1.05
1.00
0.95
0.9
0.85
0.75
-10 -8 -6 -4 -2 0 2 5 7
Capacity coefficient
Outdoor temperature ( C)
Capacity coefficient of outdoor unit on defrost operation
0.99
0.98
0.96
0.95
0.91
0.88
0.86
0.91
1.00
On heating operation, frost can be formed on heat exchanger according to outdoor temperature.
(Frost on heat exchanger results in decreasing the performance.)
To remove frost on heat exchanger of outdoor unit, defrost operation is carried out periodically.
During defrost operation, capacity of outdoor unit may decrease.
The decrement is not considered to the individual capacity tables.
This figure shows an effect of intelligence defrost operation
defrost operation
performance is improved
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