Duct diffuser

Catalog 1.1.4
Duct diffuser
RRA
Orford Arts Centre, Orford, Canada
Duct Diffuser
NAD Klima
content
RRA model
Description, areas of application and benefits . . . . . . . . . . . . . . . . . . . . . . . . . RRA 1
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 2
Range of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 3
Selecting the number of slots with offset drums . . . . . . . . . . . . . . . . . . . . . .. . RRA 4
Selecting the number of slots with roller nozzles . . . . . . . . . . . . . . . . . . . . . . RRA 5
Functioning, airflow and direction of airflow . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 6
Performance diagrams
Airflow speed – RRA with offset drums. . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 7
Vertical airflow speed (offset drums). . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RRA 8
Airflow speed – RRA with roller nozzles . . . . . . . . . . . . . . . . . . . . . . . . . .
RRA 9
Acoustic power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 10
Loss of pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 11
Calculation example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 12
Dimensions and weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 13
Suspension of the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 14
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 17
Codification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 18
Codification of the anchorage system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RRA 20
1.1.4
RRA
C
Munich Airport, Germany
NAD Klima
Duct Diffuser
Description, areas of application and benefits
The RRA is an in-duct diffuser developed for commercial, industrial and
rest areas.
It is ideal for applications where the
technology must be not only efficient
but also integrated into the architectural design. Thanks to NAD Klima’s
technology of integrated offset drums
and/or the clean nozzles and drums,
the circular RRA diffuser offers a multitude of air direction choices. All air
conditioning and heating solutions are
found in one application which
combines technology, aesthetics and
comfort.
Areas of application
- Commercial industry
- Ventilated or large rooms
- Office areas
- Entry halls, Atriums
- Commercial and industrial areas
- Buildings with wood frames
- Public spaces
- Air curtains with nozzles
Benefits
- Adjustment of the jet of air between
diffusers; divergent, vertical and all
other intermediate positions.
- Easy adaption of the airflow for use
in various spaces.
- A combination of all types of jet in
one diffuser.
- Rapid reduction in speeds and
differences of temperature thanks to
strong induction
- Installation in any kind of system of
ducts (horizontal, vertical etc.)
- Connects to any duct or accessory
which complies with SMACNA
standards.
- Powder coated paint from the RAL
color chart.
- Its finish allows easy cleaning (with a
multifilament cloth)
RRA in-duct diffuser
with offset drums
- Eliminates secondary attachments
and traditional diffusers.
RRA in-duct diffuser
with roller nozzle
- Offset drums allow an adjustment of
the airflow in a 180° range
- Possibility of reducing the total
airflow up 25% in VAV.
- Possibility of removing additional
heating sources in certain conditions.
Subject to technical changes. Version 17 / 06 / 2015
1.1.4
RRA
1
Duct Diffuser
NAD Klima
Configuration
Operation of the RRA
Assembly
The in-duct diffuser can be installed in
any type of system and in any position
(horizontal, vertical etc.)
The flow of air traverses the diffuser
along its length and the expelled air is
intercepted by perpendicular fins and
the offset rollers. Many diffusers can be
mounted in the duct one after the
other but must be balanced using
accessories and ducts.
Composition
The RRA in-duct diffuser is a smooth
circular pipe on which the slots are
mounted in the direction of the length.
The number of slots is only limited by
the diameter of the duct and is
regulated by the amount of air to be
circulated by the diffuser.
The slots contain the ABS offset drums
or ABS roller nozzles (black, cream or
white) with a length of 100mm. The
drums are provided with alphanumeric
guides which allow adjustment of the
airflow pattern across a 180° angle. The
RRA diffuser is constructed in diameters
from 200mm up to 1419mm. Metallic
reinforcements are installed on the
interior of ducts wider than 433mm to
maintain the circular shape. At each
extremity, a groove with an EPDM
gasket is installed to provide a seal if
multiple sections are to be attached.
The RRA diffuser sections are
connected by connection sleeves
which are adapted to the diameter of
the duct.
Accessories
All of the standard accessories (elbows,
connection sleeves, reduction connectors, multi-branch connectors, etc.) are
available in the exact dimensions of the
duct.
Standard Sleeve (120 mm) (RRA are joined)
X
X=0
The RRA diffuser is generally installed in
visible areas and is recommended for
many reasons, one of which being
aesthetics. The same finish is used for
all the accessories which are situated in
the same visible area. Passive ducts
without slots are available in the same
dimensions as the active RRAs.
120
X
Special Sleeve ( Spacing
between RRA )
X = from 1 mm to 1380 mm
X
Ducts
Active duct
Bivelled end cap
Passive duct
Accessories
Sleeve
Sleeve
inside
Cap
Wheel
cone
Centric
Reducer
Excentric
reducer
Branch “ S”
Branch “ T ”
Branch “ W ”
Branch “ D ”
Elbows
15°
2
30°
1.1.4
45°
RRA
60°
90°
curved
90°
straight
Branch “ Q ”
Subject to technical changes. Version 01 / 05 / 2015
Duct Diffuser
NAD Klima
Range of application
Maximum installation space
Installation
height of
of the RRA
H
Recommended
sspace
between RRA
X MAXIMUM
m (ft)
m (ft)
50 - 120 (9 - 22)
≤ 3 (10)
5 (16)
120 - 150 (22 - 27)
3 - 4.5 (10 - 15)
7 (22)
150 - 170 (27 - 31)
4.5 - 7 (15 - 23)
8 (26)
Air flow by
meter of slot
of .RRA
Vo
m3/h/m (cfm/li. ft)
x
x
x
x
x
x
x
Cooling only: keep the maximum distance X depending on the
height, but keep the airflow by meter of the slot at
50 – 120m3/h/m.
Aerodynamic balancing and placement of
the reducers
To optimize the uniform airflow in the sections of
the RRA diffuser, we recommend the installation of a
reducer after the fifth (5th) active section (see 1).
To preserve the uniformity of diameter in a diffusion
section, a balancing key can replace the reducer
after the fifth (5th) active section (see 2).
If there is no balancing key or a reducer, we recommend the installation of a balancing register before
or after the fourth (4th) section as shown (see 3).
x
Selection of the diameter
For a lower flow
than 1400 cfm,
use the following table:
perforated register
3
exterior wall of
duct RRA
Slot
3
Ø recommended
below 280 cfm
200 mm (8 in.)
281cfm to 460 cfm
251 mm (10 in.)
461cfm to 650 cfm
303 mm (12 in.)
651 cfm to 1100 cfm
353 mm (14 in.)
1101 cfm to 1400 cfm
403 mm (16 in.)
For higher flow to 1400 cfm,
select a duct diameter (see diameters in
the codification on page 18) for a maximum air speed of 1000 cfm.
eccentric drum
3
section with register
2
1
Subject to technical changes. Version 29 / 05 / 2015
Flow range
3
3
1.1.4
RRA
3
Duct Diffuser
NAD Klima
Selecting the number of slots
with offset drums
Important :
To make the selection of RRA, the total
airflow must be calculated for a 1m length
of active slots.
m3/h/m (cfm/li.ft)
1500 (269)
1360 (243)
1300 (233)
(179)
900 (161)
850 (152)
(143)
750 (134)
700 (125)
680 (122)
.
Air flow V by active slot lengths of 1 m
600 (108)
600 (107)
(90)
510 (91)
Specifications:
Height at the bottom of the duct:. H = 4.00 m
Airflow by diffuser:
Vo = 520 m3/h
Cooling:
∆T = - 10°C
Heating:
∆T = +10°C
Length of the RRA:
LR = 1500 mm
1190 (213) 1200 (215)
1020 (183) 1050 (188)
960(172)
900 (161)
840 (150)
720 (129)
Research:
1- Airflow per meter of slot section
2- Number of slots n
600 (107)
480 (86)
Solution:
1 1-The length of RRA slot is determined
by the following :
LS = LR - 200 mm = 1300 mm
We find the airflow by meter of slot
section:
.
.
Vo [m3/h RRA] X F = Vo[m3/h/m]
520 [m3/h] X 0.77 = 400 [m3/h/m]
450 (81)
(72)
340 (61)
(54)
(36)
(18)
360 (64)
300 (54)
240 (43)
2
170 (30)
150 (27)
120 (21)
2
(9)
number of slots (n)
1
2
3
4
5
6
7
.
Using the diagram “Selecting the
number of slos”, for a height of 4m and
with a heating application, we find the
number of slots: n=3
8
m3/h/m/slot
(cfm/li.ft/slot)
Air Flow by meter of slot of RRA V0
Cooling only for all heights.
Airflow conversion by meter of slot
length :
.
.
Vo [m3/h/m RRA] X F = Vo [m3/h/m]
.
.
Vo [cfm/RRA] X F = Vo [cfm/li.ft.]
50 - 120 (10-22)
Heating and cooling or cooling only for heights ≤ 3.0m
Heating and cooling or heating only for heights of 3.0m – 4.5m *
120 - 150 (22 - 27)
Heating and cooling or heating only for heights of 4.5m – 7.0m*
* validate the sound level
150 - 170 (27 - 31)
Lenght of
In the case where heating mode is being used for heights greater than 3m it cannot be selected for
RRA
the initial flow, reduce the length of the slot Ls in respect to the airflow by meter of vent recommended.
active slots lengths of 1 m
active slots lengths
of 1 ft
LR
75
DN 200 - 1400
75
60
4
LS (ex : 1300)
LR (ex : 1500)
1.1.4
RRA
60
1
1000
1100
1200
1300
1400
1500
1600
1700
1800
Slot lenght
LS
(mm)
(800)
(900)
(1000)
(1100)
(1200)
(1300)
(1400)
(1500)
(1600)
[Li.ft.]
Multiplication
factor
F
[2.62]
[2.95]
[3.28]
[3.60]
[3.94]
[4.27]
[4.60]
[4.92]
[5.25]
Standard
Subject to technical changes. Version 26 / 06 / 2015
[0.382]
[0.339]
[0.305]
[0.278]
[0.254]
[0.235]
[0.217]
[0.203]
[0.190]
Duct Diffuser
NAD Klima
with roller nozzles
Important :
To facilitate the selection of the RRA, the
total airflow should be calculated for
lengths of the active vents of 1m.
m3/h/m (cfm/li.ft)
2800 (501)
2720 (487)
2600 (466)
2400 (423)
2380 (426)
2400 (423)
Specifications:
Height at the bottom of the duct: H = 6.5 m
.
Airflow by diffuser:
Vo = 1040 m3/h
Heating:
∆T = +10°C
Length of the RRA:
LR = 1500 mm
2200 (388)
2000 (358)
2040 (365)
1800 (322)
2100 (376)
1800 (322)
1700 (304)
1600 (287)
1500 (269)
1400 (250)
1360 (243)
.
Air flow V by active slot lengths of 1 m
1200 (215)
Research:
1- Airflow per metre of slot section
2- Number of slots n
1200 (215)
1000 (179)
1020 (183)
Solution:
1- The length of the slots and nozzles of
the RRA is determined by the following:
LS = LR - 200 mm = 1300 mm
The airflow s calculated by number of
slot section metres
V. o [m3/h RRA] X F = V. o[m3/h/m]
1040 [m3/h] X 0.77 = 800 [m3/h/m]
800 (143)
800 (143)
680 (122)
600 (107)
400 (72)
600 (107)
2
340 (60)
300 (53)
240 (42)
200 (36)
number of slots (n)
1
2
3
4
5
6
7
.
Air Flow by meter of slot of the RRA V0
2- We find the airflow by meter of slot with
the diagram “Selecting the number of
slots” and for a height of 6.5m and with
a heating application we find the
number of slots: n=3
8
m3/h/m/slot
(cfm/li.ft/slot)
Heating only for ceiling heights of 4,5 m - 6,0 m
240 - 300 (43 - 54)
Heating only for ceiling heights of 6,0 m - 7,5 m
300 - 340 (54 - 61)
-If the heating mode to the heights above 3 m can be selected to an initial rate, reduce the length Ls
of the slot in accordance with the air flow per meter of recommended slot.
active slots lengths of 1 m
active slots lengths
of 1 ft
75
Lenght of
the RRA
LR
DN 200 - 1400
75
Conversion and airflow by length for a
1 meter slot :
.
.
Vo [m3/h/m RRA] X F = Vo [m3/h/m]
.
.
Vo [cfm/RRA] X F = Vo [cfm/li.ft.]
60
LS (ex : 1300)
LR (ex : 1500)
60
1
1000
1100
1200
1300
1400
1500
1600
1700
1800
Slot lenght
LS
(mm)
(800)
(900)
(1000)
(1100)
(1200)
(1300)
(1400)
(1500)
(1600)
[Li.ft.]
[2.62]
[2.95]
[3.28]
[3.60]
[3.94]
[4.27]
[4.60]
[4.92]
[5.25]
Multiplication
factor
F
1.25
1.11
1.00
0.91
0.83
0.77
0.71
0.67
0.63
[0.382]
[0.339]
[0.305]
[0.278]
[0.254]
[0.235]
[0.217]
[0.203]
[0.190]
Standard
Sous réserve de modifications techniques. Version 26 / 06 / 2015
1.1.4
RRA
5
NAD Klima
Duct Diffuser
Functioning, airflow and direction of airflow
Control the direction of the air jet
Due to the different pressure zones
created by the offset rollers, the airflow
can be adjusted through a 180° range.
Application examples
– slots at 0° air direction
Direction of the air
21/DE
Diffuse
DFR
1.8 m
(6 ft)
figure A
BC/EF
Diffuse
DFE
AB /DE
Diffuse
DFA
1.8 m
(6 ft)
AB/EF
Diffuse
DFH
figure B
max. 6 m (20 ft)
1.8 m
(6 ft)
figure C
RRA diffuser with offset drums and/or nozzles
RRA diffuser with offset drums
RRA diffuser with offset drums
As a result, the combinations of airflow
are almost infinite. In manufacture, the
ducts are individually adjusted for each
project. The standard setting of the
drums is set to diffusion mode in the
positions “21” and “65” alternately.
As a result, the divergent mode allows
jets to blow in better defined directions. This mode also allows a longer
projection of the airflow. In specific
zones which are habitually difficult to
cover, a specialized setting can be
created. Figures C and D, show the
relationship between the position of
the offset drum and the direction of the
exiting airflow.
Note, to maximize the air projection,
multiple jets can be orientated in the
same direction to optimize the
coverage of a zone, even when
heating.
This setting produces strong induction
which can be used to meet heating and
cooling needs thereby creating high
mixing levels. Figures A and B show the
settings which are most frequently
used.
CD
Diverging
DVV
AB-EF
Diffuse
DFH
CD
Diverging
DVV
Application examples
slots at +90°
All
Heights
CD/ EF
Diffuse
DFT
AB/ CD
Diffuse
DFN
21- 65
Diverging
DVS
1.8 m
(6 ft)
max. 5.4 m (18 ft)
21/65
Diffuse
DFS
max. 4 m (13 ft)
65/BC
Diffuse
DFL
max. 3 m (10 ft)
(This is demonstrated in the figure below)
1.8 m
(6 ft)
figure D
RRA diffuser with offset drums and/or nozzles
180°
(12h)
Indexing range
Air Flow
min. max.
offset Drum
-90°
(9 h)
0°
(6 h)
+90°
(3 h)
Note :
Coding faces the air jet
Direction of air low
Roller Nozzle (DRB)
6
1.1.4
RRA
Subject to technical changes. Version 26 / 06 / 2015
Duct Diffuser
NAD Klima
Performance diagrams
RRA with offset drums
V max= k1 x Vmax diagram
Airstream pattern
(drum position)
Diffuse
(1 x 2 1 / 1x 6 5)
standard
3
2
Number of slots n
Divergence
(half left 2 1 half right 6 5)
See example on page 10 1
m3/h/m slot
cfm/li. ft/ slot 7
Volume flow V˙ 0
Airflow distance after the blast y[m]
9
11
13
14
16
133
21 24 27
18
29
2,2
4
m
)
v
00
y
(1
cit
)
lo
4m
(1
20
ve
y
air
flo
w
Air flow distance x [m]
y = 2.2 m
ax
=
0,4
m
(6
/s
0)
6
(8
(5
0p
0)
i/m
)
(4
0)
(3
0)
5
1.8 m
8
X
X
X
7
°F
X
°C
41
y
Vertical
(All C D)
Subject to technical changes. Version 29 /05 / 2015
Vertical penetration depth ymax [m]
y
T
∆
ce
ren
e
ff
di
ure
rat
e
mp
Te
°F
°C
50
°C
°F
68
°C
°F
86
°C
4°F
10
1.1.4
RRA
7
Duct Diffuser
NAD Klima
Vertical airflow speed
22
18
16
14
13
11
Ai
rF
low
V˙
9c
fm
/p
/hi.li./f
/m en
slote
t
with offset drums
3
3
6
24
27
13
5
1
2
7
4
Temperature ∆T [°C]
number of slots n
x[m]
y
X
Vertical deviation y [m]
The values of y are valuable for the
“horizontal jet diffusion” setting.
For the setting “horizontal jet divergence”, the value is multiplied by the
factor 0.9.
8
1.1.4
RRA
Additionnal airflow deviation ∆y as a
result of the airflow discharge angle
Subject to technical changes. Version 29 / 05 / 2015
Duct Diffuser
NAD Klima
Airflow speed
3
2
200 266 300
170
cfm/li. ft/ slot 30
Volume flow V˙ 0
36
48
54
350 400 500
600 800
1000
1200
63
107 143
179
215
72
0f
pm
)
11
90
in heating
)
)
40
00
)
60
)
00
0)
(4
00
3,5
(7
5,0
)
3,0
(6
00
5,5
)
2,2
5(
45
2,0
6,0
4,5
4,0
3,0
1°F
C4
5°
6,5
Vertical penetration ymax [m
(2
0,8
air
Air Flow distance y or x+y [m]
flo
1,0
4
8,5
8,0
7,5
7,0
Subject to technical changes. Version 29 / 05 / 2015
(1
0,7
(1
(1
20
)
(1
00
)
50
cit
ve
lo
5
w
6,5
y
7,0
0,6
v ma
x
=
7,5
y
)
30
0,2
0,1
8,0
5(
0,1
m
9,0
)
/s
(2
10
0,5
x
See example on page 5
1
m3/h/m slot
5(
Number of slots n
with roller nozzles
6,0
ce
n
ere
5,5
5,0
4,5
re
7
e
mp
6
Te
u
rat
diff
∆T
C
0°
=1
°F
50
°F
20
°C
68
°F
86
F
°C 104°
0
3
C
°
40
4,0
3,5
1.1.4
RRA
9
Duct Diffuser
NAD Klima
Acoustic power
with offset drums
Data:
figure E
2080 m3/h
4
3
LR = 1500mm
LS = 1300mm
- Total airflow:
- Number of RRA sections:
- Number of slots per RRA:
- Length of the RRA:
- Length of the slot:
2
37
Research:
po
sit
1A
io
n
A o
CD
B rF
or 6
EF
- What is the acoustic power generated LWA ?
Solution :
dr
um
To determine the acoustic power generated by the RRA diffuser,
it is necessary to calculate the air flow by meter of slot.
Acoustic power level L WA [dB(A)]
1
From the total airflow, the number of RRA sections and slots we find:
2080m3/h ÷ 3 slots = 173 m3/h per slot.
For a slot length of 1300mm, we calculate the airflow by meter of slot:
173 m3/h X 0.77 = 133 m3/h/m /slot (see page 4). 1
In the acoustic power diagram we read:
L WA diagram= 37 dB(A) 2
The table below and the number of slots n=3 : ∆L WA= 6.8 dB(A) 3
Finally, the acoustic power generated is:
LWA = LWA diagram + ∆LWA = 43.8 dB(A) - 10 dB(A) = 33.8 dB(A)
1
m3/h/m slot
cfm/li. ft/ slot 7
Volume flow V˙ 0
9
11
13
14
18
133
22 24 25
29
Note : The absorption of the room has not been taken into consideration.
For a comparison with North American values, reduce the acoustic power
by -10.
LWA = LWA Diagram + ∆LWA
Number
of slot
LR
n
∆LWA
S
LR
LR
S
∆LWA
S
∆LWA
3
LR = duct length
10
1.1.4
RRA
LS = slot length
Standard
Subject to technical changes. Version 26 / 06 / 2015
Duct Diffuser
NAD Klima
Loss of pressure
"D"
D
5 m/s (1000 fpm)
mm (in.)
D
D
D
90°
60°
45°
Pa / m
(" water / 100ft)
Pa
in. water
Pa
ΔP drum
ΔPL* Reducer
d
L
ΔP
Pressure drop
by diameter of
regular duct
Diameter
of the duct
r
__
= 1.5
D
ΔP * Pressure loss by diameter in elbows
ΔP duct
14°
in. water
Pa
in. water
Pa
in. water
0.8
0.003
Air flow for slot length
of 1 meter
Excentric
drums
Jet
nozzles
m /hm (cfm/ft)
ΔP
Loss of pressure
over
all drums
(1A/F6)
Pa ( " water )
200 (8)
1.63 (0.20)
2.5
0.010
2.0
0.007
1.5
0.005
50 (9)
100 (18)
21 (0.08)
251 (10)
1.31 (0.16)
3.6
0.011
2.1
0.008
1.6
0.006
55 (10)
110 (20)
22 (0.09)
302 (12)
1.06 (0.13)
3.0
0.012
2.3
0.009
1.8
0.008
60 (11)
120 (22)
22 (0.09)
353 (14)
0.82 (0.10)
3.7
0.014
2.9
0.011
2.3
0.009
65 (12)
130 (24)
23 (0.09)
403 (16)
0.73 (0.09)
3.9
0.014
3.0
0.012
2.5
0.010
70 (13)
140 (26)
24 (0.09)
454 (18)
0.65 (0.08)
4.1
0.016
3.3
0.013
2.6
0.010
75 (13)
150 (26)
24 (0.10)
505 (20)
0.57 (0.07)
4.2
0.017
3.3
0.013
2.8
0.011
80 (14)
160 (28)
25 (0.10)
556 (22)
0.49 (0.06)
4.6
0.018
3.5
0.014
3.1
0.011
85 (15)
170 (30)
26 (0.10)
607 (24)
0.41 (0.05)
5.0
0.020
3.8
0.016
3.6
0.012
90 (16)
180 (32)
27 (0.11)
657 (26)
0.41 (0.05)
5.1
0.020
3.9
0.017
3.6
0.012
95 (17)
190 (34)
27 (0.11)
708 (28)
0.37 (0.045)
5.3
0.021
4.0
0.017
3.7
0.014
100 (18)
200 (36)
28 (0.11)
759 (30)
0.37 (0.045)
5.4
0.021
4.1
0.018
3.7
0.014
105 (19)
210 (38)
29 (0.12)
810 (32)
0.33 (0.040)
5.5
0.022
4.2
0.018
3.9
0.015
110 (20)
220 (40)
30 (0.12)
861 (34)
0.29 (0.035)
6.0
0.024
4.4
0.019
4.3
0.016
115 (21)
230 (42)
31 (0.12)
911 (36)
0.29 (0.035)
6.1
0.024
4.4
0.019
4.3
0.016
120 (22)
240 (44)
33 (0.13)
962 (38)
0.24 (0.030)
6.5
0.025
4.9
0.022
4.8
0.017
125 (22)
250 (44)
34 (0.14)
1013 (40)
0.24 (0.030)
6.5
0.025
4.9
0.022
4.8
0.017
130 (23)
260 (46)
35 (0.14)
1064 (42)
0.24 (0.030)
6.5
0.025
5.0
0.022
4.8
0.017
135 (24)
270 (48)
36 (0.14)
1115 (44)
0.20 (0.025)
6.9
0.027
5.3
0.023
5.3
0.018
140 (25)
280 (50)
38 (0.15)
1165 (46)
0.20 (0.025)
7.0
0.029
5.4
0.023
5.3
0.018
145 (26)
290 (52)
39 (0.16)
1216 (48)
0.20 (0.025)
7.0
0.029
5.4
0.023
5.3
0.018
150 (27)
300 (54)
40 (0.16)
1267 (50)
0.16 (0.020)
8.0
0.031
6.1
0.026
6.3
0.022
155 (28)
310 (56)
42 (0.17)
1318 (52)
0.16 (0.020)
8.1
0.032
6.2
0.026
6.3
0.022
160 (29)
320 (58)
43 (0.17)
1369 (54)
0.16 (0.020)
8.1
0.032
6.2
0.026
6.3
0.022
165 (30)
330 (60)
44 (0.18)
1419 (56)
0.16 (0.020)
8.2
0.033
6.3
0.026
6.3
0.022
170 (31)
340 (62)
45 (0.18)
*ΔPL Equivalence in lenght of pressure loss
** Based on ∆P = 0.82 Pa/m (0.1 " of water / 100ft)
Correction factor for different air velocity in duct :
ΔP = F x ΔP (v=1000 fpm)
Air velocity
in duct
ΔP
Pressure drop
by diameter
in straight duct
Factor of correction
ΔP
Pressure drop
in elbows
for different adjustments of drums :
ΔP = F x ΔP (standard adjustment)
ΔP
Pressure drop
in reducer
m/s (fpm)
F
F
F
Roll
adjustment
1A/F6
3 (600)
0.4
0.8
0.4
AB/EF
1.0
4 (800)
0.7
0.9
0.6
CD
1.1
5 (1000)
1.0
1.0
1.0
21/65
1.1
6 (1200)
1.4
1.1
1.4
32/54
1.4
7 (1400)
1.8
1.2
2.0
CD/65-CD/21
1.1
Subject to technical changes. Version 01 / 05 / 2015
Recommended
F
1.0
1.1.4
RRA
11
NAD Klima
Duct Diffuser
Calculation example
20 m
Zone 1
Zone 2
1500
10 m
Total air flow : 1232 m3/h (725 cfm)
Direction of the air flow
4m
5m
Total air flow : 4160 m3/h (2908 cfm)
Data:
Air diffusion in two zones
Air speed in the duct
5 m/s (1000 ppm)
Temperature difference
∆T = +10°C
Height at the bottom of the duct
4m
Zone 1:consists of two(2) sections
Section n° 1:
- 4 x (active RRA, L = 1500 mm, D = 657 mm )
- airflow per RRA: 520 m3/h
Section n° 2:
- 1 reducer (657 mm to 505 mm)
- 4 x (active RRA, L = 1500 mm, D = 505 mm )
- 1 x (passive RRA, L = 1500 mm, D = 505 mm)
- 2 x (90° elbow, D = 505 mm )
- airflow per RRA: 520 m3/h
Zone 2 : consists of one section
- 1 reducer (505 mm to 302 mm)
- 4 x (active RRA, L = 1500 mm, D = 302 mm )
- 1 x (end cap, D = 302 mm)
- airflow per RRA: 308 m3/h
Questions:
1. What are the total airflows by meter of slot in
each zone and the number of corresponding
slots?
2. What will the acoustic level LWA be?
3. What are the pressure losses of the installation?
Note: For a system height of 3m, a single RRA circular
tube is sufficient to cover an area of 10m.
- The placement of vents at 0° (6 o’clock) with
the drums set in position A B/E F (diffusion).
12
1.1.4
RRA
Solutions :
1. The total airflow by meter of slots depends
on the airflow diffused by the RRA.
Zone 1: For airflow per RRA of 520m3/h 1
and a length of 1500mm, we calculate the
airflow by meter of slots:
520 m3/h x 0.77 = 400 m3/h/m
The table “Selecting the number of slots”, on
page four (4) and for heating mode with a
duct height of 4m, we determine the
number of slots: n=3. 2
Zone 2: the same way, we calculate the airflow
by meter of slot sections:
308 m3/h x 0.77 = 237 m3/h/m
We determine the number of slots: n=2.
2. The diagram of acoustic power, the offset
drum set in positions 2 1/6 5 (diffusion) and
three (3) slots per RRA:
400 m3/h/m ÷ 3 = 133 m3/h/m
LWA = LWA DIAGRAM + LWA =
37 + 6.8 - 10 dB(A) = 33.8 dB(A) 3
3. The loss of pressure of the system is due to
the restriction of air traversing the drums
and air friction against the inner walls of the
straight ducts, elbows and reducers.
Zone 1, section 1
- The total length of 4 x active RRAs of a diameter
D=657mm is:
L = 4 x 1500 mm = 6 m, where:
∆P3.2.1 = 6 m x 0.41 Pa/m = 2.5 Pa
Zone 1, section 2
- The total length of 4 x active RRAs and
1x passive RRA of diameter D=505mm
Is: L=4 x 1500mm = 6m, where:
∆P 3.2.3 = 6 m x 1.06 Pa/m = 6.4 Pa
- The total loss of pressure in the straight ducts
is: ∆P3.2 = 2.5 + 4.3 + 6.4 = 13 Pa
3.3 The loss of pressure in the elbows.
3.4 The equivalent in length of the loss of
pressure for two (2) 90° elbows with a diameter
D=505 mm is: ∆PL = 2 x 5.13 m = 10.3 m ,
where : ∆P3.4 = 10.3 m x 0.57 Pa/m = 6 Pa
Finally the total loss of pressure of the system is:
∆P3 = ∆P3.1 + ∆P3.2 + ∆P3.3 + ∆P3.4
so : ∆P3 = 58
3.1 Loss of pressure at the drums: “Loss of
pressure” table and an airflow by meter of
slots of 133m3/h/m, we read ∆P3.1 = 35 Pa
3.2 The loss of pressure by diameter of the ducts is
Note: The first section is sized to fit into a standard spiral
without sleeve
Subject to technical changes. Version 01 / 05 / 2015
Duct Diffuser
NAD Klima
Dimensions and weight
Duct lenght - LR
1000
1500
1700
Slot lenght - LS
800
1300
1500
Weight per slot (Kg)
0.30
0.48
0.56
Weight of the passive RRA (Kg)
Diameter of RRA
(mm)
Sheet thickness : 0.85 mm
200
4.20
6.38
7.15
251
5.28
7.92
8.97
302
6.35
9.52
10.79
353
7.42
11.13
12.69
403
8.47
12.71
14.40
454
9.70
14.48
16.38
Sheet thickness : 1.00 mm
505
12.67
18.93
21.43
556
13.94
20.83
23.58
607
15.69
23.21
26.22
657
16.93
25.07
28.32
708
18.97
27.74
31.25
759
20.33
29.74
33.50
810
21.70
31.73
35.75
861
23.07
33.73
38.00
911
24.40
35.69
40.21
962
26.40
38.31
43.08
1013
27.79
40.35
45.37
1064
29.19
42.38
47.65
1115
30.59
44.41
49.93
1165
31.96
46.40
52.17
1216
33.36
48.43
54.46
1267
34.76
50.46
56.74
1318
36.16
52.49
59.02
1369
37.56
54.52
61.31
1419
38.93
56.51
63.55
Standard
Subject to technical changes. Version 26 / 06 / 2015
1.1.4
RRA
13
NAD Klima
Duct Diffuser
Suspension of the system
The RRA diffuser is suspended by
threaded rods supplied by the ventilation system vendors (standard method
of suspension). On request, rod covers
which are the same color as the duct
can be supplied to cover the threaded
rods.
Other methods of suspension are
available; suspended from an aluminum
rail or suspended by a metallic cable
increase the ease of installation. These
alternative methods of suspension can
also be supplied by NAD Klima.
Suspension by threaded rod
Rod covers available
(optional)
flow
Air
Rod covers available
(optional)
Suspension by rail
flow
Air
Rails junction
Suspension by metallic cable
flow
Air
14
1.1.4
RRA
Subject to technical changes. Version 26 / 06 / 2015
Sport Centre Thibault/GM, Sherbrooke, Québec
Library room of the Cegep de Granby
Duct Diffuser
NAD Klima
Specifications
1. Description and physical characteristics
1.1 RRA in-duct diffusers are constructed in 22 gauge (0.853mm
caliber) brushed steel for a diameter smaller than 508mm and
1mm (20 gauge) for the diameter greater than or equal to
508mm. These will be supplied with integrated slots which
contain offset drums and/or roller nozzles in ABS (black, cream
or white). The offset drums are supplied with alphanumeric
guides which allow airflow pattern setting across a range of
180°.
2.5 As an option, for a neat finish, when the diffusers pass through
a wall or partition, a flange which corresponds to the dimensions of the diffuser and of the same color can be supplied by
the manufacturer.
1.2 The same diffuser can be used as a passive duct without slots
and without offset drums.
3.
1.3 The exterior of the duct can be painted with a coat of powder
coated paint with a “TGIC-free polyester” base, and has a
smooth surface which is easy to clean. The color can be chosen
by the architect or the client from the standard RAL color chart
or other colors on request. The interior of the duct can be
painted upon request.
1.4 The circular RRA in-duct diffuser will have a diameter between
200mm and 1419mm. The RRA diffuser is supplied, at each end,
with a groove which has an integrated EPDM 65 DURO gasket
which ensures a seal when multiple sections are connected.
The RRA diffuser sections are joined using connector sleeves.
1.5 To optimize a uniform airflow in the RRA diffuser sections,
balancing keys can be installed in the same duct, otherwise
reduction connectors must be installed between the sections.
Registers must be installed from the fourth (4th) section.
1.6 The ducts have the smoothest surface possible because of
integrated joints which are less than 3mm, offering a very neat
architectural appearance. The diffusers can be cleaned with a
feather duster on an extendable aluminum pole which
eliminates the need for a large ladder or lifting basket.
1.7 To maintain the circular shape of the duct and to optimize the
smooth exterior surface, metal reinforcements are installed on
the interior of ducts more than 433mm (17 inches) in diameter.
2. Installation and method of suspension.
2.1 Suspension of the RRA diffuser is enabled by threaded rods
which are supplied by ventilation vendors.
2.2 Optional rod covers in the same color as the RRA diffuser are
available and can be supplied by the manufacturer to cover the
threaded rods.
2.3 As an option, aluminum suspension rail can also be supplied by
the manufacturer. The aluminum rail can be suspended and
the RRA diffuser will be zipped onto it, offering another
solution for different ceiling types. The rail can be painted the
same color as the duct.
2.4 As an option, suspension by “aviation cable” style metallic
cables 7x7 or 7x19 in galvanized or stainless steel (304 or 316).
Medium to high tensile strength can be supplied by the manufacturer.
Subject to technical changes. Version 10 / 06 / 2015
2.6 The standard accessories to be supplied by the manufacturer
(elbows, connector sleeves, reduction connectors,
multi-branch connectors etc.).
Performance
The manufacturer will give an approval demonstration.
3.1 The performance curves indicate the speed of air in the
distance, the loss of pressure and the level of acoustic power
generated by the RRA diffuser.
3.2 A simulation of the airflow trajectory takes into account the
physical space and level of comfort in the occupied zone for
the three ventilation modes: in cooling mode, in isothermal
mode and in heating mode.
4. Setting
4.1 The setting of the offset drums can be adapted to each installation. This setting allows comfortable ventilation throughout
the occupied zone with acceptable air speeds at head height
(1.8m). This setting should be made by the manufacturer
during construction.
4.2 Each RRA diffuser is identified by a label. This label features the
number of the RRA diffuser section, the direction of air, the
number of slots and the offset drums setting.
4.3 In situations when the internal configuration of the room
changes, adjustment of the offset drums is possible even after
installation of the RRA diffusers and this can be adapted to the
new air diffusion needs.
4.4 The adjustment of the offset drums after installation of the
circular diffusers should be made according to the specifications of the manufacturer.
5. Balancing
5.1 The balancing of the RRA diffusers must be executed by a
ventilation balancing technician who has a recognized professional qualification.
5.2 The technician must know the offset drum settings for
divergent and diffusion modes, the data for which are
available in our documentation.
6 - Certification
6.1 The duct diffuser RRA meet the standard of ASTME 162
"Surface Flammability of Materials Using a Radiant Heat
Energy Source"
7.
Required quality: NAD Klima RRA model.
1.1.4
RRA
17
Duct Diffuser
NAD Klima
Codification
Codification for RRA
RRA
Product
Lenght of duct LR
1000, 1500, 1800
0800, 1300, 1600
____ = Special lenght, write the lenght in mm
XXXX = Non applicable (passive duct)
Lenght of slots LS
200, 251, 302, 353, 403, 454, 505, 556, 607, 657, 708, 759, 810, 861, 911, 962,
1013, 1064, 1115, 1165, 1216, 1267, 1318, 1369, 1419
Ø Duct diameter
X = Passive
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
039
639
612
AAA
XXX = Passive duct
006 = Slots at 0° (6h)
003 = Slots at +90°(3h)
009 = Slots at -90° (9h)
012 = Slots at 180° (12h)
XXX
DFS
DFR
DFL
DFF
DFT
=
=
=
=
Quantity of slots
Slots at +90° (3h) and at -90° (9h)
Slots at 0° (6h), +90° (3h) and at -90° (9h)
Slots at 0° (6h) and at 180° (12h)
Other (specify in annotation)
= Passive
= Diffuse standard 21/ 65
= Diffuse window DE / 21
= Diffuse window BC / 65
= Diffuse height AB / EF
= Diffuse CD / EF-slots at 3 o’clock
Slots position
DFN = Diffuse CD / AB - slots at 9 o’clock
DFH = Diffuse height BC / DE
DFA = Diffuse AB / DE
DVS = Diverging 21 / 65
DVV = Diverging vertical CD
DRB = Diverging with roller nozzle
W = White drum or white roller nozzle (RAL 9003)
C = Cream drum or cream roller nozzle (RAL 9010)
B = Black drum or black roller nozzle
X = Without drum
Drums and roller nozzles
Color
9003 = White
9010 = Cream
00SB = Solar black (Standard matte black )
00SB = Silver mat (Stamdard metallic grey)
____ = RAL color* (write the color number of RAL)
Diffuser color
A = With closed-cell acoustic insulation
X = Without insulation
Acoustic insulation
D = With damper
R = With register (perforated plate)
X = Without damper
RRA - 1500 - 1300 - 200 - 1 - 006 - DFS - W - 9003 - X - X
Air flow
Balancing damper /
Register
Annotation
Example
Codification for reducers
Product
RED = Reducer
254, 305, 356, 406, 457, 508, 559, 610, 660, 711, 762, 813, 864, 914, 965,
1016, 1067, 1118, 1168, 1219, 1270, 1321, 1372, 1422
203, 254, 305, 356, 406, 457, 508, 559, 610, 660, 711, 762, 813, 864, 914,
965, 1016, 1067, 1118, 1168, 1219, 1270, 1321, 1372
T = Flat on Top (standard)
C = Center
T
B = Flat on Bottom
S = Standard α = 14°
A = Other (specify in annotation)
A = With closed-cel acoustic insulation
X = Without insulation
Annotation
ød
14°
Ø D - Input diameter
Ø d - Output diameter
Configuration
C
9003 = White, 9010 (Cream),
00SB = Solar black (Standard matte black )
00SB = Silver mat (Stamdard metallic grey)
____ = RAL color * (write the color number of RAL)
RRA - RED - 305 - 203 - T - S - 9003 - X
ØD
RRA
B
Length
Color
Acoustic insulation
Example
Blue: Standard
18
1.1.4
RRA
Subject to technical changes. Version 01 / 05 / 2015
Duct diffuser
NAD Klima
Codification
Codification for elbows
RRA
Product
ELB = Elbows
15°
15, 30, 45, 60, 90, QA
30°
45°
60°
90°
QA
Angle
203, 254, 305, 356, 406, 457, 508, 559, 610, 660, 711, 762, 813, 864, 914, 965,
1016, 1067, 1118, 1168, 1219, 1270, 1321, 1372, 1422
S = Standard ( based on : r = 1.5 D)
A = Other ( specify in annotation)
9003 = White, 9010 = Cream,
00SB = Standard matte black, 00SM = Standard metallic grey
____ = RAL colors * (write the color number of RAL)
A = With closed-cell insulation
X = Without insulation
RRA - ELB - 15 - 203 - S - 9003 - X
Annotation
Ø Diameter
Radius
Color
Insulation
Example
Codification for the branches
RRA
BRA = Branches
Product
203, 254, 305, 356, 406, 457, 508, 559, 610, 660, 711, 762, 813, 864, 914, 965,
1016, 1067, 1118, 1168, 1219, 1270, 1321, 1372, 1422
203, 254, 305, 356, 406, 457, 508, 559, 610, 660, 711, 762, 813, 864, 914, 965,
1016, 1067, 1118, 1168, 1219, 1270, 1321, 1372, 1422
203, 254, 305, 356, 406, 457, 508, 559, 610, 660, 711, 762, 813, 864, 914, 965,
1016, 1067, 1118, 1168, 1219, 1270, 1321, 1372, 1422
T, D, W, S, Q
T
ØD - Input diameter
Ød1 - Output diameter
Ød2 - Output diameter
Q
S
W
D
9003 = White, 9010 = Cream,
00SB = Standard matte black, 00SM = Standard metallic grey
____ = RAL colors * (write the color number of RAL)
Configuration
Color
A = With closed-cell insulation
X = Without insulation
RRA - BRA - 305 - 305 - 203 - T - 9003 - X
Annotation
Insulation
Example
Codification for endcap and collar
CAP (End cap), BEC (Bevelled endcap), BES (Bevelled endcap + slots -return), BEG (Bevelled endcap + grid -return), WCO (Collar)
203, 254, 305, 356, 406, 457, 508, 559, 610, 660, 711, 762, 813, 864, 914, 965,
1016, 1067, 1118, 1168, 1219, 1270, 1321, 1372, 1422
9003 = White, 9010 = Cream,
00SB = Standard matte black, 00SM = Standard metallic grey
____ = RAL colors (write the color number of RAL)
Product
Ø Diameter
ØD
RRA
CAP
WCO
Color
BEC
A = With closed-cell insulation
X = Without insulation
RRA - CAP - 203 - 9003 - X
Insulation
Annotation
Example
Codification for sleeves
SLE (Sleeve) , SLI (Inner sleeve )(no lenght available)
203, 254, 305, 356, 406, 457, 508, 559, 610, 660, 711, 762, 813, 864, 914, 965,
1016, 1067, 1118, 1168, 1219, 1270, 1321, 1372, 1422
200, 251, 302, 353, 403, 454, 505, 556, 607, 657, 708, 759, 810, 861, 911, 962,
1013, 1064, 1115, 1165, 1216, 1267, 1318, 1369, 1419
Ø Diameter of SLE
SLI
SLE
120
XXXX = Non applicable (SLI)
0000 = Standard (The distance between RRA is 0 mm)
____ = Special - write the «x» value (distance between RRA)- from 0001 mm to 1380 mm maximum
9003 = White, 9010 = Cream, 00SB = Standard matte black,
00SM = Standard metallic grey , ____ = RAL colors (write the color number of RAL)
A = With closed-cell insulation
X = Without insulation
RRA - SLE - 203 - 0000 - 9003 - X
Annotation
Product
X
ØD
RRA
Ø Diameter of SLI
Length of the SLE
Color
Insulation
Example
Blue: Standard
Subject to technical changes. Version 07 / 05 / 2015
1.1.4
RRA
19
Duct diffuser
NAD Klima
Codification of the anchorage system
Anchorage by rail
Anchorage by cable
Product code
Product code
Description
RAI
Description of anchors for the ceiling
CPA
ALU Aluminium rail
(1 1/4" X 1 3/4" X 10 pi.)
S33 Steel rail
(1 5/8" X 7/8" X 10 ft.)
A : 2 in.
9003
9010
____
XXXX
A
B
B : 7/8 in.
00SB = Solar black
= White
= Cream 00SM = Silver Mat Color
= Color RAL * (write the # )
= Unpainted
RAI - ALU - 9003
CPP
Flat anchor with pins and
throttle adjustment
2 screws (#4 wood) included
Anodized aluminum only.
Ø 40 X ø 15 X 70 mm
(Ø 1 5/8" X ø 9/16" X 2 3/4")
CPS
Anchor with pin and throttle
adjustment
Screw (#4 wood) included
Nickel plating finish
13 X 55 mm
(1/2" X 2 3/16")
Exemple
RCT Rod cover for threaded rod
16 mm X 3.05 m (5/8" X 10 pi )
00SB = Solar black
9003 = White
00SM = Silver Mat
9010 = Cream
____ = Color RAL * (write the # )
XXXX = Unpainted
RCT - 9003
Ø 13 mm
Description of anchors for the diffuser
Color
Exemple
Anchor with adjustable hook
and nickel plating finish
Ø 13 mm
(Ø 1/2" X 2 3/4" X 9/16")
CCA
Adjustable anchor for duct
with a nickel plate finish.
Ø19 X 50 mm
(Ø 3/4" X 2")
CCP
Pivoting anchor finished in
nickel plating
Not adjustable
Ø19 X 25 mm
(Ø 3/4" X 1")
CCS
Pivoting anchor finished in
nickel plating
Not adjustable
Ø19 X 25 mm
(Ø 3/4" X 1")
Product code
Accessories supplied for aluminum rail (ALU)
RKG
RKJ
RKC
Nylon guides assembly
Junction bar plate
200 X 28 X 12 mm
(7 13/16" X 1/2" X 1 1/16"))
Coupling assembly
with bolt and washer
3/8”
Accessories supplied for steel rail (S33)
RKS
Slide bolt and washer
assembly
RKG
Example
Accessories supplied with the aluminum rail (ALU)
- RKG - Nylon guides assembly
- RKJ - Junction bar plate assembly
- RKC - Coupling assembly
5/16”
XXXX = Without cable
3048 mm - standard
_____ Write the lenght in mm
Cable lenght
A = Nickel plated steel (standard)
S = Stainless Steel (optionnal)
CCS - 3048 - A
Example
Accessories supplied with the steel rail (S33)
- RKS - Slide blot and washer assembly
20
1.1.4
RRA
Subject to technical changes. Version 01 / 05 / 2015
TVA building, Montréal, Québec
www.nadklima.com
NAD Klima 144, Léger street, Sherbrooke (Québec), Canada J1L 1L9 • T : 819 780-0111 • 1 866 531-1739 • F : 819 780-1660 • info@nadklima.com