Selection Procedure - Daikin VRV Series Technical Data Manual

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Selection procedure

RXYHQ12-36P8
INTEGRATED HEATING CAPACITY COEFFICIENT
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:
Integrated heating capacity = A
Value given in table of capacity characteristics = B
Integrating correction factor for frost accumulation (kW) = C
A = B x C
Integrating correction factor for finding integrated heating capacity
Inlet port temperature of heat exchanger (°C/RH 85%)
Integrating correction factor for frost accumulation
Defrosting operation
+
0
-
N
OTE
1 The figure shows that the integrated heating capacity expresses the integrated capacity for a single cycle ( from defrost operation to defrost
operation) in terms or time.
Please note that, when there is an accumulation of snow against the outside surface of the outdoor unit heat exchanger, there will always be a
temporary reduction in capacity, although this will of course vary in degree in accordance with a number of other factors, such as the outdoor
temperature (°CDB), relative humidity (RH) and the amount of frosting which occurs.
• Outdoor Units • VRV HEAT PUMP • RXYHQ12-36P(8)
Defrosting operation
1 cycle
• VRV Systems • Outdoor Units
-7 -5 -3 0
0.96 0.93 0.87 0.81
Time
3 5 7
0.83 0.89 1.0
3TW27232-7
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