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BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
pressure inside the BS unit is within the range of 20~350 Pa below the pressure of
the surroundings. We use this 115 m³/h airflow rate for further calculations.
0
50
0
- 42.9
-50
-100
-150
-200
-250
-300
Note: These curves present the internal pressure of the BS unit compared to an
ambient pressure of 101325 Pa.
Use the curve of the outlet pressure (P
for the BS unit. With an airflow rate of 115 m³/h, the resulting pressure drop
generated by the BS unit is 47.5 Pa.
0
50
0
- 47.5
-50
-100
-150
-200
-250
-300
Use the curves, with instructions how to read them, of the manufacturer of the
components to find the pressure drop generated by all components in the
ductwork. A conversion of units might be required. Beware that for ducting, the
pressure drop from the manufacturer might be given per unit length of ducting
(units are for example Pa/m). Multiply this value by the duct length to find the total
pressure drop.
ΔP
Ducting
[Pa/m]
1
EXAMPLE
115
AFR
[m³/h]
Write down the pressure drop of each component in an overview table. Sum up
the pressure drops.
Nº
Indication
1
a
BS unit
2
b
3
c
4
b
5
c
6
b
7
d
Expander
8
e
9
f
Reducer
10
b
11
b
12
g
Non-return valve
13
b
14
h
Wall grill
13
Special requirements for R32 units
|
115
100
150
200
250
AFR
[m³/h]
OUT
) in function of the airflow rate (AFR
OUT
115
100
150
200
250
AFR
[m³/h]
OUT
ΔP
Bends
[Pa]
8
115
AFR
[m³/h]
Type
AFR [m³/h]
115
Duct
"
Bend
"
Duct
"
Bend
"
Duct
"
"
Duct
"
"
Duct
"
Duct
"
"
Duct
"
"
300
300
Length [m]
∆P [Pa/m]
-
-
5
1
-
-
10
1
-
-
2
1
-
-
6
0.5
-
-
2
1
1
1
-
-
1
1
-
-
Total pressure drop (sum of rows 1 to 14)
Installer and user reference guide
)
OUT
∆P [Pa]
47.5
5
8
10
8
2
4
3
6
2
1
11
1
15
123.5
49
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