Linear cylinder diffuser
pag. A-74
LC
Description
Linear rotating cylinder diffuser for ceiling or wall installation. Each slot houses inside a range of cylinders, that, by rotation, allow differents launch configurations. Compared to the traditional linear slot
diffuser, it offers more flexibility and best performances. In fact, it’s possible to guarantee comfortable
environment’s conditions (absence of air-flows) also
in presence of high specific loads, due to the jet splitting (alternate throw), which allows a fast reduction of
velocity. Characterized by pressure drops and limited noise levels, thanks to the big versatility, it’s used
both for cooling and for heating both for ceiling and
for wall. To maintain the aesthetic uniformity, the LFR
(LF) linear diffuser can be used in intake.
Dimensions
Nominal length (L) : 1000, 1500, 2000 mm*
Slots’ number (N) : 1, 2, 3, 4
* Different lengths on request (by increments of 100 mm)
Construction
Extruded anodised aluminium (LC), extruded natural
painted aluminium (LCW). Plastic material cylinders.
Finish
Anodised aluminium, with black cylinders (LC). Gloss
white RAL 9010, powder-coated polyester type, with
white cylinders (LCW).
Specifications
Linear rotating cylinder diffuser for ceiling or wall installation. Ceiling diffusion with horizontal launch and
alternate throw, with or without Coanda effect. Ceiling
diffusion with vertical launch. Wall diffusion. Possibility to rotate cylinders in closing position, in order to
partialize the jet. Anodised aluminium or white painted aluminium RAL 9010 and plastic material (cylinders) construction.
N
1
2
3
4
qv
DP
d
LWA
qv
DP
d
3
LWA
(m /h)
(Pa)
(m)
(dBA)
100
20
0,7
33
150
40
1,8
43
200
75
4,5
50
100
10
0,8
27
200
25
1,6
39
300
50
3,7
46
200
15
0,9
32
300
30
2,0
41
400
50
4,6
47
300
20
1,5
34
400
35
3,5
40
500
50
5,5
45
air flow per meter (L = 1000 mm)
pressure drop
distance from the wall (hi = 3 m)
noise rating (rif. 10-12 W)
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
Accessories
PLSA-LC: standard plenum type“A”
PLSB-LC: standard plenum type “B”
PLSC-LC: standard plenum type “C”
PLIA-LC: insulated plenum* type “A”
PLIB-LC: insulated plenum* type “B”
PLIC-LC: insulated plenum type “C”
*internal polyurethane insulation thickness 6mm, cl. 1
N
A*
B*
C
D**
F***
H
(mm)
(mm)
(mm)
(mm)
(mm)
(mm)
1
35/31
51/31
100
30/37
158
230
2
64/60
80/60
90
59/66
198
270
3
93/89
109/89
70
88/95
198
270
4
122/118
138/118
70
117/124
248
320
* LC / LCSB
** type “A” / type “B”
*** external diameter, single inlet for L = 1000 mm, double inlet for
L = 1500 mm and L = 2000 mm.
C
D
BF
H
43
A
B
Plenum type “A”
06.06.16
Linear cylinder diffuser
LC
pag. A-75
Other versions
LCSB: like LC but without lateral frame, for plasterboard
installation.
B-20
For wall installations it is used the plenum type “C”, with
the wall hanging of the plenum or ceiling hanging and
diffuser’s fixing to the plenum through apposite screws,
through slots.
Mounting scheme
The basic mounting scheme provides the employment of
plenum type “A” with hanging of the diffuser to the ceiling
through specific brackets. These allow also the diffuserplenum junction (with gasket). The regulation damper
can be controlled through a fine tool (for ex.: screwdriver). As alternative, by employment of plenum type “B”,
it’s possible to fix diffuser to plenum, working on special
suspension screws, through slots.
C
A*
B*
E
F***
G
(mm)
(mm)
(mm)
(mm)
(mm)
35/31
51/31
113
158
220
N
1
2
64/60
80/60
113
198
290
3
93/89
109/89
113
198
320
4
122/118
138/118
143
248
400
* LC / LCSB
*** external diameter, single inlet for L = 1000 mm, double inlet
for L = 1500 mm and L = 2000 mm.
D
E
BF
H
BF
50
12.5
G
A B
12.5
A
B
Plenum type “C”
Plenum type “B”
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
06.06.16
Linear cylinder diffuser
pag. A-76
Plenum
Plenum type “B”
Plenums are equipped with single inlet in case of L =
1000 mm and with double inlet for L = 1500 mm and for
L = 2000 mm. Other different executions are possible at
request.
Plenum type “A”
H1
H2
H
(mm)
(mm)
(mm)
1
88
132
220
2
108
152
260
3
108
152
260
4
133
177
310
N
* LC / LCSB
H1
H2
H
(mm)
(mm)
(mm)
1
100
130
230
2
120
150
270
3
120
150
270
4
145
175
320
N
* LC / LCSB
Adjustable damper from ambient
(in photo PLSB-LC)
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
06.06.16
LC
Linear cylinder diffuser
LC
pag. A-77
Plenum type “C”
550
1000
The composition foresees the use of 2000 mm sectionsin the center and of elements of different lenght at the
two ends, according to following rule (nominal lenght L):
450
H1
H2
H
1035/1005*
1500
800
350
350
H1
H2
H
1535/1505*
2000
1000
550
The composition of the plenums follow same rules of
the diffusers. On request different compositions are
possibile.
In the case of composition of elements disposed at 90°,
shaped angles are available (ANGLC) that allow a fast
and nice connection.
450
H1
H2
L=2500 mm: 1000+1500
L=3000 mm: 1000+2000
L=3500 mm: 2000+1500
L=4000 mm: 2000+2000
L=4500 mm: 1000+2000+1500
L=5000 mm: 1000+2000+2000
L=6000 mm: 2000+2000+2000
L=7000 mm: 1000+2000+2000+2000
L=8000 mm: 2000+2000+2000+2000
H
RA
2035/2005*
H1
H2
H
(mm)
(mm)
(mm)
1
90
130
220
2
110
180
290
3
110
210
320
4
135
265
400
N
R9
* LC / LCSB
B
Diffusers composition (L > 2000)
In case of L > 2000 mm, the execution is made in more
parts. The composition of two side by side LC is made
through grooved pins and connection plates to be
mounted where there are the fixing screws, which can
be normally found at the end of the diffuser.
A
B
(mm)
(mm)
1
60
51
2
89
80
3
118
109
4
147
138
N
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
06.06.16
Linear cylinder diffuser
pag. A-78
Launch configuration
By adequate cylinder’s positioning (which have asymmetric profile) into the slot and by using the proper reference marks, it’s possible to obtain the following diffusion
geometries:
LC
2) Horizontal bilateral ceiling diffusion with alternate
throw and without Coanda effect.
1) Horizontal bilateral ceiling diffusion with alternate
throw and Coanda effect (alternate tangent).
It’s the standard configuration. Cylinders are disposed
so that the consecutive elements could generate opposite directions launches. This allows elementary stable
jet splitting, with larger induction’s surface, compared to
the traditional linear slot diffusers, and then a faster reduction of velocity and temperature difference. The vein
adhere to the ceiling and to the walls, in the conventionally occupied zone with a residual velocity that must be
the plan’s one.
Cylinders disposition
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
It’s the alternative configuration to the 1) when installation height or distance from walls don’t allow its employment (inadequate residual velocity in the conventionally occupied volume). Cylinders are disposed so that
the consecutive elements could generate wide apart
launches without Coanda effect (angles between jets ≤
50°). The elementary stable jets splitting, offers a larger
induction’s surface and then a faster reduction of velocity and temperature difference.
Cylinders disposition
06.06.16
Linear cylinder diffuser
LC
3) Vertical ceiling diffusion.
It’s the maximum vertical penetration configuration.
Cylinders are disposed so that vertical elementary jets
could form a single front.
pag. A-79
4) Alternate throw wall diffusion.
It represents the alternative solution to the traditionals
wall grilles. Cylinders are disposed so that the consecutive elements could generate wide apart launches (angles
between jets ≤ 50°). The elementary stable jets splitting,
ensure a faster reduction of speed and temperature difference.
Cylinders disposition
Cylinders disposition
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
06.06.16
Linear cylinder diffuser
pag. A-80
It’s otherwise possible to opt for “mixed” configurations,
by adequated match of the previous cases and proper
cylinder disposition. For example it’s possible to orient
a part of the jet to the ceiling and another part along the
wall, however keeping alternate throw.
LC
5) Diffusion with interruption fringes (closed cylinder).
Sometimes it can be useful to rotate cylinders until
complete slot closure: this option increases even more
the diffuser’s versatility. For example in case of vertical
launch, when you want to increase the penetration through throw’s velocity increment, or in case of unexpected
obstacle, in correspondence of which, it becomes necessary to nullify the jet.
Cylinders disposition
Cylinders disposition
Asymmetrical cylinder
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
06.06.16
Linear cylinder diffuser
LC

pag. A-81
Performances: L=1000, N=1 (alternate tangent)
50
1
LwA (dBA)
45
40

35
120
100
Key to symbols
Distance from wall
qv
Air-flow per single diffuser
Pressure drop
LWA Sound power level weighed “A”
(rif. 10-12 W)
Selection
1 At the requested air-flow qv, according to diagram 1,
determine slots number N so that the sound power
level LWA can’t exceed the maximum allowed one for
plan’s value.
2 At the requested air-flow qv, known N, from point 1
and known the installation height hi, from diagram 2,
determine the minimum distance from wall d.
3 At the requested air-flow qv, known N, from point 1,
verify from diagram 3 that the pressure drop DP is in
accordance with the plan’s value.
Correction factors
In the case of diverging horizontal ceiling diffusion or alternating wall diffusion, consider a pressure drop increase equal to 70%. In the case of vertical exhaust, consider a pressure drop increase equal to 60%.
200
qv (m3/h)
5
hi=2,5 m
4
d (m)
DP
180
2
Installation height
d
160
3
hi=3,0 m
2
hi=3,5 m
1
hi=4,0 m
0
100
80
70
120
140
160
180
qv (m3/h)
200
3
60
50
P (Pa)
hi
6
140
40
Note
The minimum distance from wall d has been determined
so that the residual velocity in the occupied volume does
not exceed 0,20 m/s. Velocity probes have been disposed at 0,6 m distance from wall, and at a height from
floor corresponding to UNI-EN-ISO 7726 norm.
In the case project concerns diffusers disposed on parallel rows, it’s recommended to consider 2d as minimum
wheelbase.
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
30
25
20
100
120
140
160
qv (m /h)
3
06.06.16
180
200
Linear cylinder diffuser
pag. A-82
Performances : L=1000, N=2 (alternate tangent)
50
LC
Performances : L=1000, N=3 (alternate tangent)
50
1
1
45
40
LwA (dBA)
LwA (dBA)
45
35
35
30
25
100
5
40
120
140
160
180
200
250
300
30
200
qv (m3/h)
6
2
250
qv (m3/h)
300
350
2
5
4
d (m)
d (m)
hi=3,0 m
2
hi=2,5 m
4
hi=2,5 m
3
400
3
hi=3,0 m
2
hi=3,5 m
1
hi=3,5 m
1
hi=4,0 m
hi=4,0 m
0
0
100
60
50
150
200
250
qv (m3/h)
300
200
50
3
250
300
qv (m3/h)
350
400
3
40
40
30
P (Pa)
P (Pa)
30
25
20
15
25
20
15
10
100
120
140
160
180
200
250
qv (m3/h)
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
300
10
200
250
qv (m3/h)
300
06.06.16
350
400
Linear cylinder diffuser
LC
pag. A-83
Performances : L=1000, N=4 (alternate tangent)
45
Air-flow calculation
For air-flow calculation must be employed hot-wire anemometers. The probe must be positioned as shown in
the picture, in correspondence to cylinders’ middle line,
orienting the “window” against the flow. Reference cylinders are: 5° and 6° for L = 1000 mm, 4°, 5°, 11°, 12° for
L = 1500 mm, 5°, 6°, 15°, 16° for L = 2000 mm (result is
the same counting from right or from left). In each point,
the average velocity must be measured in a minimum
breaktime of at least 1 minute (average in time). In order
to obtain the air-fow, calculate the arithmetic average of
the so measured values (ṽk), and multiply it for value Ak,
carried in the table, which refers only to diffusion with
alternate tangent throw.
1
LwA (dBA)
40
35
30
300
7
350
qv (m3/h)
400
450
2
500
N=1
N=2
N=3
N=4
L = 1000 mm
0,0095
0,0153
0,0234
0,0315
L = 1500 mm
0,0143
0,0230
0,0351
0,0473
L = 2000 mm
0,0190
0,0306
0,0468
0,0630
qv = ṽk x Ak
hi=2,5 m
6
Ak (m2)
d (m)
5
hi=3,0 m
4
3
hi=3,5 m
2
1
hi=4,0 m
0
300
50
350
400
qv (m3/h)
450
500

3
45
40

P (Pa)
35

30
25
20
300
350
qv (m3/h)
400
450
F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy
phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - [email protected]
500
06.06.16