TPI 19 VVKR

Diffusers
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Calculation of v
H1
and ΔT
L
for a swirl diffuser at basic deector conguration
Flow length between the occupied zone and the ceiling H
1
= H - H
0
(Obr. 7)
H
1
= 3,65 - 1,8 = 1,85 m
Distance between two anemostats A = B = 3 m
Diagram 2 for VVKR-A-600×40 with a horizontal connection, at q
v
= 540 m
3
• h
-1
, A = 3 m and distance H
1
= 1,85 m shows:
1. v
H1
= 0,18 m • s
-1
Diagram 3 shows the temperature differential ΔT
L
/ ΔT
0
for VVKR-A-S-600×40,
at distance L
t
= A/2 + H
1
= 1,5 + 1,85 = 3,35 m is:
2. ΔT
L
/ ΔT
0
= 0,06
ΔT
L
= ΔT
0
× 0,06 = -8 × 0,06 = -0,48 K
NOTE: In the calculation, it is important to use a lower L
t
amount, i.e. the worst case scenario (by a wall or between two diffusers).
Conclusion:
The requests in the example will be fullled by anemostat
VVKR - A - S - 600 × 40 in the amount of 35 pieces
with the PB - VVK - S - 600 - S - H plenum box in the amount of 35 pieces,
distributed according to the example solution
V
H1
(m
•
s
-1
)
0,15
0,60
0,50
0,40
0,30
0,25
0,20
0,8 1 1,5 2
3
4 5
6
Distance A or B
0,9 1,2 1,6 2 (m) H
1
=
q
v
= 800
650
500
400
300
(m)
(m
3
• h
-1
)
540
0,18
1,85
Temperature differential ΔT
L
/ (ΔT
0
)
0,5
0,4
0,3
0,20
0,15
0,10
0,05
0,04
0,03
0,02
0,01
80
48
40
24
16
8
32
Number of deflectors
Distance L
t
0,8 1 1,5 2 5
(m)
3 4
92
3,35
0,06
36
Diagram 1: Supply air pressure drop and sound
power level, VVKR - A - 600 × 40
Diagram 2: Air ow throw and air ow velocity,
VVKR - A - 600 × 40
Diagram 3: Temperature differential
VVKR - A - 600 × 40
Pressure drop ΔP
t
(Pa)
100
70
50
30
20
10
200
5
H
H
V
V
q
v
300 400 600 800 1000 1200
(m
3
• h
-1
)
L
W
dB(A)
15
20
25
30
35
40
45
50
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