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Системы кондиционирования VRV
REYQ34M7W1B
Технические данные Страница: 17

Daikin REYQ34M7W1B [17/32] Capacity correction ratio

• Selection procedure

• Systems • Selection procedure

2 Capacity correction ratio

2-12 REYQ16M7W1B

• Rate of change in cooling capacity • Rate of change in heating capacity

3D042144

NOTES

1 These figures illustrate the rate of change in capacity of a standard indoor unit system at maximum load (with the thermostat set to maximum)

under standard conditions.

Moreover, under partial load conditions there is only a minor deviation from the rate of change in capacity shown in the above figures.

2 With this outdoor unit, evaporating pressure constant control when cooling, and condensing pressure constant control when heating is carried out.

3 Method of calculating cooling / heating capacity (max. capacity for combination with standard indoor unit)

cooling / heating capacity

= cooling / heating capacity obtained from performance characteristics table x each capacity rate of change

When piping length differs depending on the indoor unit, maximum capacity of each unit during simultaneous operation is:

cooling / heating capacity = cooling / heating capacity of each unit x capacity rate of change for each piping length

4 When overall equivalent pipe length is 90m or more, the diameter of the main liquid pipes (outdoor unit-branch sections) must be increased.

5 When the main sections of the interunit gas pipe diameters are increased the overall equivalent length should be calculated as follows. (Heating only)

Overall equivalent length = Equivalent length to main pipe x 0.5 + Equivalent length after branching

Example

In the above case (Heating)

Overall equivalent length = 80m x 0.5 + 40m = 80m

The correction factor in capacity when H

= 0m is thus approximately 1.0

6 In the combination which does not include cooling only indoor unit, calculate the equivalent length pipe by the following when you calculate cooling

capacity.

Overall equivalent length = Equivalent length to main pipe x 0.5 + Equivalent length after branching

Example

In the above case (Cooling)

Overall equivalent length = 80m x 0.5 + 40m = 80m

The correction factor in capacity when H

= 0m is thus approximately 0.88

EXPLANATION OF SYMBOLS

: Level difference (m) between indoor and outdoor units with indoor unit in inferior position

: Level difference (m) between indoor and outdoor units with indoor unit in superior position

L: Equivalent pipe length (m)

α : Capacity correction factor

Diameter of above case

Model liquid

REYQ16MY1B ø 15.9

Diameter of gas pipes

Model liquid

REYQ16MY1B ø 12.7

80 m 40 m

Outdoor unit

Indoor unit

Equivalent length Equivalent length

Size increase

Branch