supply, return, dummy linear slot diffusers - optimain.ae slot diffusers.pdf · supply, return,...

LINEAR SLOT DIFFUSERS

Supply, Return, Dummy Linear Slot Diffusers

OptimaAIR DIFFUSION PRODUCTS


OSLD-1

OPTIMA model OSLD-1 is a supply linear slot diffuser with integral volume control damper and hit andmiss air straightening deflectors.

Hit and miss air straighteners and integral damper arefully adjustable from the of the diffuser.

OSLD-2

OPTIMA model OSLD-2 is a return or extractlinear slot diffuser with air pattern controlling deflectors (Hit and miss damper).

Hit and miss damper is fully adjustable from the faceof the diffuser.

OSLD-3

OPTIMA model OSLD-3 is a dummy or non activelinear slot diffuser with hit and miss damper and ablanking plate to replace integral damper.

Available from 1 through 8 slots with 3 different slotwidths for low, medium and high capacity requirements.

More than 8 slots available on request.

B

A

S S 32

h

1


Supply, Return, Dummy Slot Diffusers



OSLD-3

OPTIMA model OSLD-3 is a supply linear slotdiffuser with integral volume control damper and hitand miss air straightening deflectors.

Hit and miss air straighteners and integral damper arefully adjustable from the face of the diffuser.

OSLD-4

OPTIMA model OSLD-4 is a return or extractlinear slot diffuser with air pattern controlling deflectors (Hit and miss damper).

Hit and miss damper is fully adjustable from the faceof the diffuser.

OSLD-5

OPTIMA model OSLD-5 is a dummy or nonactive linear slot diffuser with hit and miss damperand a blanking plate to replace integral damper.

For T‘S’ and T‘ER’ type models:N

N

W

L

A

B

S

=

=

=

=

=

=

=

Nominal size = Duct size = L x W

L x No. of Slots

Width of the plenum, indicated in No. of Slots

Length of the Slot Diffuser

Neck size = Width of the slot diffuser neck

Overall width from the face side of the slotdiffuser (flange to flange width)

Slot width = 16 mm / 20 mm / 25 mm ofmodels TL / TM / TH respectively

Coding:1.2.3.4.5.

Slot diffuserSlot widthIntegral damperHit and miss damperDiffuser flange

B

SS

A

h

2


Construction Details and Dimensions



Slot diffuser dimensions:

False ceiling opening size = (B - 30) mmError correction = + 1% due to manual work.

N

L

W

=

=

=

Nominal size = L x W

Length of linear slot diffuser

Width of linear slot diffuser

indicated in No. of Slots

No. of SlotsSlot 16 mm Slot 20 mm Slot 25 mm

A B A B

1

2

3

4

5

6

7

8

40

74

108

142

176

210

244

278

80

114

148

182

216

250

284

318

44

82

120

158

196

234

272

310

84

122

160

198

236

274

312

350

49

92

135

178

221

264

307

350

89

132

175

218

261

304

347

390

B

A

S 18 S 32

3





Slot diffuser dimensions:

No. of SlotsSlot 16 mm Slot 20 mm Slot 25 mm

A B A B

1

2

3

4

5

6

7

8

36

70

104

138

172

206

240

274

72

106

140

174

208

242

276

310

40

78

116

154

192

230

268

306

76

114

152

190

228

266

304

342

45

88

131

174

217

260

303

346

81

126

167

210

253

296

339

382

False ceiling opening size = (B - 26) mm.

Error correction = + 1% due to manual work.

N

L

W

=

=

=

Nominal size = L x W

Length of linear slot diffuser

Width of linear slot diffuser

indicated in No. of Slots

A

18B

S10 S 28

55 h

4





A with End Cap

B with End Flange

090 corner piece

0135 corner piece

300

300

300

300

C with open ends

D with one side End Cap/Flange

E with both side End Caps/Flanges

For positive alignment of adjacent sections alignment strips provided with each diffuser.

5


Construction Details and DimensionsPlenum box details:

OPTIMA acoustically lined plenum box is used for evenly distributing cool air over the surface of thelinear diffuser with minimum noise turbulence, thereby maintaining correct performance characteristics. Itsaves fabrication and installation labor.

Plenums are manufactured to suit the full range if linear diffusers from 1 to 8 slots.

All joints are welded and sealed for air tight functioning which adds to maintain rigidity.

Internal baffles are perforated sheet or splitters to suit the design, or a combination of both in special cases.

Maximum one piece length is 150mm. Above this length plenums are supplied in multiple sections of even

length each provided with an inlet spigot.

Material:

Plenum box is manufactured form galvanized sheet steel of 0.7 mm thickness and internally lined insulationis of 25 mm thickness mineral fibre.

Plenum dimensions with insulation: Plenum dimensions with insulation:

No. ofSlots

D H x Y

1

2

3

4

5

6

7

8

150

200

200

250

250

315

315

315

300

300

300

300

300

365

365

365

*A + 10

*A + 10

*A + 10

*A + 10

*A + 10

*A + 10

*A + 10

*A + 10

X + 100

X + 100

X + 100

X + 100

X + 100

X + 100

X + 100

X + 100

NOTE:

No. ofSlots

D H x Y

1

2

3

4

5

6

7

8

150

200

200

250

250

315

315

315

*A + 10

*A + 10

*A + 10

*A + 10

*A + 10

*A + 10

*A + 10

*A + 10

275

275

275

275

275

340

340

340

X + 50

X + 50

X + 50

X + 50

X + 50

X + 50

X + 50

X + 50

NOTE:

A = slot diffuser neck sizeThickness of the insulation = 25 mm

* A = slot diffuser neck size*

Y

H

X

D

25



6




Possible combinations of discharging of air by adjusting the Hit and miss damper.

50% horizontal along theceiling50% vertically downwards

100% horizontal along theceiling

100% vertically downwards

100% horizontal along theceiling

100% vertically downwards 50% horizontal along theceiling50% vertically downwards

Engineering and Performance Date

7





Air InductionIn ceiling application, the air induction ratio for slotdiffusers without any blade setting is low, comparedto air induction with ceiling diffusers.

Air induction increases very rapidly with the adjustment of the deflection blades.

For such reason, no deflection should be applied withfalse ceiling height of more than 4.00 meter.

For low ceiling height the deflection becomes necessary and throw must be adapted accordingly.

With slot diffusers, flow pattern can be adjusted toany local situation.

Influence on air induction with and without blade set-ting is shown on opposite graphs and photos aremade under following conditions:

standard mode with 20 mm slot widthno deflection setting

0deflection blades adjusted to 45 angle setting.no restriction on air flowdiffuser length 100 mm

This model gives an air flow pattern which is adjustable from full left to full right by simply adjusting thedeflection blades (Hit and miss damper). This can be easily done before or after installation.

This high capacity unit has been designed to serve the performance oriented market of today.

Air flow capacity can be controlled by the integral volume damper or inlet spigot damper in the plenum box.

Technical data

Induced Air Flow

Symbols

m/s

m/s3 3m /h or m /s3 3m /h or m /s3 3m /h or m /s

Formulae

i =VL

Vi

t = 0.8 . tx o

Vx

VoInduction ratio

Supply air temperature

Room temperature

Air temperature in the jet axis at a distance ‘X’

Supply air temperature differential

Temperature differential at a distance ‘X’

Vo

Vt

V

Vi

VL

Outlet air velocity

Terminal air velocity

Supply air flow rate

Induced air flow rate

Total air volume at end of throwV = V + VL i

I

to

tr

tx

to

tx

( t) ratio

OCOCOC

K

K

( t) = tx

to

t = t + tx r 0 ( t)

t = t + t0 0 r

t = t - tx x r

Air induction

3Induced air ratio to m /h supply air.

per m. length

Air

flo

w3

m/h

.

500

1,000

1,500

2,000

2,4000.5 1.0 1.5 2.0 2.5

2 slot

3 slot

4 slot

5 slot

8





Sound level

The sound level of a linear slot diffuser is in direct ratio to the velocity of the are passing through it.

Due to the reduced sound level of SLD diffusers, air passing through a properly selected outlet will not add anyappreciable noise to the sound level of the general air conditioning system.

When hit and miss damper or integral damper is partially closed for balancing purposes, noise level canincrease in function of the importance of the air distributing network.

For distributing network extending more than 50 meter, basic balancing should be made by volume controldampers in the ducting.

Adjustment of deflection blades does not add any complementary sound level.

Final sound attenuation in the distributing system can be obtained by inside sound insulation in the plenumboxes.

In order obtain reasonable sound level, velocity in the outlet should be selected as follows:

Ceiling height

3 m - max 3 m/sec.4 m - max 4 m/sec4.5 m. - max 5 m/sec.

Effect of damper adjustment on noise generation

Symbols

Total pressure drop through register, withdamper fully open (read from selectiondiagram)

Total pressure drop through register,with damper partially open

Ratio of pressure drops

Pa

Pa

Noise level with damper fully open(c.f. selection diagram)

Noise level with damper partially open

Increase in noise level

P1

P2

P1

P2

NR1

NR2

NR

Formula

NR2 = NR1 + NR

9





Throw Test Data

Product: Linear Slot Diffuser - 6 SlotRun No. 1 Air Volume L/s 75

Distance from Outlet (m)

cm 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

2.5

7.5

15

22

30

45

60

90

120

1.85

1.07

-

-

1.09

1.04

1.04

0.79

-

-

0.91

0.84

0.89

0.91

0.53

0.46

-

0.86

0.74

0.74

0.74

0.48

0.51

-

0.71

0.58

0.56

0.56

0.41

0.46

0.25

-

0.66

0.53

0.48

0.51

0.36

0.48

-

0.53

0.46

0.43

0.43

0.30

0.38

-

0.33

0.30

0.28

0.28

-

-

-

-

-

-

Velocity in m/s.

Run No. 2 Air Volume L/s 100Distance from Outlet (m)

cm

2.5

7.5

15

22

30

45

60

90

120

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

2.21

1.68

-

-

-

1.52

1.42

1.37

1.07

0.25

-

1.32

1.22

1.27

1.24

0.74

0.51

-

1.14

1.02

1.04

0.99

0.61

0.56

0.28

-

0.94

0.76

0.74

0.74

0.53

0.69

0.33

-

0.81

0.66

0.58

0.56

0.43

0.53

0.38

-

0.71

0.61

0.58

0.58

0.43

0.46

0.30

-

0.61

0.53

0.53

0.53

0.38

0.46

0.30

0.28

-

0.46

0.41

0.36

0.38

0.28

0.33

0.28

-

0.36

0.33

0.30

0.30

0.25

0.25

0.28

-

0.28

0.25

-

-

-

-

-

-

-

Velocity in m/s.

10


NC

45

40

35

30

25

20

100 150 200 300 400 500 700 1000 1500 2000 30003Air floe m /h‘TS’ ‘TM’ T‘ER’ ‘TM’

1 sl

ot

2 sl

ot

3 sl

ot

4 sl

ot

5 sl

ot6

slot

1 sl

ot

2 sl

ot

3 sl

ot

4 sl

ot5

slot

6 sl

ot


Sound Test Data

Octave BandCenter Frequency

Hertz

Linear Slot Diffuser - 6 Slot

Discharge Sound Power Level Lw-12 dB re 10 Watt

125250500

1000200040008000

49.541.537.029.023.521.5*27.5*

1 2 3 4

55.047.545.038.533.023.5*27.5*

60.553.552.047.044.035.027.5*

64.058.056.552.550.543.529.0*

Total Air Volume L/s

Inlet Total Pressure, Pa

**Noise Critetia

150

15

21

200

26

30

250

41

37

300

58

42

Sound power level data marked with an asterisk has reached ambient levels in the test room. Actual levels are less than or equal to the levels indicated.

Noise Criteria ratings were determined by subtracting 10 dB (room effect) from the Sound Power Levels.**

*

Noise level for Linear diffusers Model T‘S’ ‘TM’/T‘ER’ ‘Tm’



11



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30

20

15

50

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2010

0

87

65

43

21

50403020

350

300

250

200

150

125

100

75

2, 31

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15




87

65

43

21

8 9 10765432

No

. of

Slo

ts

350

300

250

200

150

125

100

504030

Air

volu

me

V =

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l Pre

ssur

e

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40

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.

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20

10

0

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y se

lect

ion

gra

ph

s fo

r L

inea

r S

lot

Dif

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lot W

idth

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0 m

m

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an

d P

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ata

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Per

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.

1 2, 3

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8

2520

1510

50

16

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