BGH GMV6 - Calculation Method on Adding Quantity of Piping Refrigerant

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CALCULATION METHOD ON ADDING QUANTITY OF PIPING REFRIGERANT
Adding quantity of refrigerant R=Adding quantity of piping refrigerant A+∑adding quantity of
refrigerant B of each module
Adding quantity of refrigerant R=Adding quantity of piping refrigerant A+∑adding quantity of
refrigerant B of each module
(1) Calculation method on adding quantity of piping refrigerant A:
Adding quantity of piping refrigerant A=∑Liquid pipe length×adding quantity of liquid pipe refrigerant
in each meter.
Liquid pipe
diameter(mm)
Φ
28.6
Φ
25.4
Φ
22.2
Φ
19.05
Φ
15.9
Φ
12.7
Φ
9.52
Φ
6.35
kg/m 0.680 0.520 0.350 0.250 0.170 0.110 0.054 0.022
(2) Calculation method on adding quantity of refrigerant of each module B:
Adding quantity of ODU refrigerant B(kg)** ODU capacity(kW)
Allocation rate of rated
capacity of IDU and ODU C*
Allocation
quantity of IDU
22.4 28 33.5 40 45 50.4 56 61.5 68
50%≤C≤70%
<4 0 0 0 0 0 0 0 0 0
≥4 0.5 1 1 1 1 0.5 1 1.5 1.5
70%
＜
C≤90%
<4 0.5 1 1 2 2 1.5 2 2 2
≥4 1 1 1 2 2 2.5 3 3.5 3.5
90%
＜
C≤105%
<4 1 1 1 2 2 2.5 3 3.5 3.5
≥4 2 2 2 4 4 4 5 5 5
105%
＜
C≤135%
<4 2 2 2 3 3 3.5 4 4 4
≥4 3.5 4 4 5 5 5.5 6 6 6
NOTES:
a.
*
Allocation rate C of rated capacity of IDU and ODU=Total sum of rated cooling capacity of IDU/total
sum of rated cooling capacity of ODU.
b.
**
If all the IDUs are energy recovery ventilated IDU, then adding quantity B of refrigerant of each
module is 0kg.
c. When energy recovery ventilated IDU is connected with normal multi VRF IDU, the charging method is
the same as that of normal IDU.
Example
：
Example 1：
The ODU is consisting of two modules with the capacity of 28kW and 45kW and IDU is consisting of 5
sets of duct type unit with the capacity of 14kW.
Allocation rate C of rated capacity of IDU and ODU=140×5/(280+450)=96%, the number of IDU is
over 4, from the above table we can see:
Adding quantity B of refrigerant of the module with the capacity of 28kW is 2.0kg.
Adding quantity B of refrigerant of the module with the capacity of 45kW is 4.0kg.
Therefore,
Adding quantity B of refrigerant of each module=2.0+4.0=6.0kg.
Assuming the adding quantity A of piping refrigerant=Liquid pipe length×adding quantity of liquid pipe
refrigerant in each meter=20kg.
Total adding quantity R of system refrigerant=20+6.0=26.0kg.
Example 2
：
The ODU is consisting of the module with the capacity of 45kW and IDU is consisting of 1 set of energy
recovery ventilated IDU with the capacity of 45kW. Adding quantity B of refrigerant of the module is 0kg.
Therefore,
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