D A L 3 5 8®

WKD 381Industr ia l diffuserl

c a t a l o g 1 . 1 . 6

®

MADE IN

W K D 3 8 1®

Description and bene�ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Con�guration and mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Range of application and quick selection . . . . . . . . . . . . . . . . . . . . . . . . . 3

Performance diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Temperature and induction behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Speci�cations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Codi�cation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Table of content

© NAD Klima 2019 - All rights reservedWKD 381® and NAD Klima® are registred trademarks, operated under licenses by Equipement NAD inc.

The information contained in this catologue is subject to change.Refer to the digital version on www. nadklima.com

Version 2019

W K D 3 8 1®

1

Presentation and b ene�ts

Areas of application

- Commercial spaces- Theaters- Exposition Centres- Stores- Industrial spaces- Gymnasiums

Swirl chamber di�user

The WKD 381 di�user has been specially developed to meet air requirements in areas with high ceilings. Its design allows for an installation in free suspension.

The WKD 381 is a high induction swirl di�user with a round front plate, a turbulence chamber integrated in the plenum, and an ajustable nozzle.

The adjusting mechanisms of the WKD 381 with ajustable nozzle facilitates the variation of the air jet direction (horizon-tal to vertical).

Regardless of the ventilation mode, heating or cooling, the WKD 381 is e�cient in both industrial and commercial setting. The adjustment can be manual or motorized.

Bene�ts

- Adjustable air�ow - Low acoustic power - Rapid decrease of speeds and temperature di�erences - Reduction of energy costs for air treatment - Manual or motorized adjustment - Possibility of changing the air jet penetration force by

varying its intensity and induction - The long-range nozzle allows high vertical penetration in

heating mode

W K D 3 8 1®

2

Con�guration and mo de of op eration

1

4 22

Con�guration

1

3

4

5

2

CoolingHeating

3

Nozzle Position 1Stable vertical air �ow with long penetration

Nozzle Position 2Vertical jet with helical e�ect

Nozzle Position 4Horizontal air�ow (without in�uence from the ceiling) with a maximum horizontal scope and an elevated primary induction

Nozzle Position 3Horizontal air�ow with a reduced helical e�ect and a relatively low scope

Mode of operation

The air �ow entering the turbulence chamber (1) through the eccentric rollers (2) creates an intensive helical move-ment, depending on positioning of the nozzle (4). The air�ow at the de�ector’s outlet (3) will produce an induction and a variable penetration.

The WKD 381 di�user is composed of a cylindrical swirl chamber (1), around which are placed eccentric rollers to direct air (2) to the de�ector (3), and a manually or motorized adjustable long-range nozzle (4 ). These components are located in a plenum (5).

This di�user is available in nominal sizes 300 / 500 / 600. It is adapted for heights up to 8 m (26 ft) and speeds up to 2000 m3/h (1176 pcm) per di�user. The di�user ispowder coated with a polyester TGIC-free paint, providing a smooth, easy-to-clean, chip and fade resistant �nish. The colours are available from the RAL colour chart.

W K D 3 8 1®

3

R ange of applic ation and quick selec tion

DN 300 / 1

DN 500 / 1

DN 600 / 1

DN 600 / 2

DN 600 / 3

354045

303540

303540

303540

303540

1.31.72.0

1.31.72.2

1.11.41.8

1.72.33.0

1.62.02.4

7.09.011.0

3.03.75.0

2.83.64.7

4.55.57.7

7.59.011.0

~2~2~2

~2~2~2

~2~2 2

2 2 2

2 2 2

60100150

173050

152645

152545

203045

160200250

240300400

320400520

500650850

80010001200

Air �

ow

V0

Hauteur sous plafond

DN 600 / 3

DN 600 / 2

DN 600/ 1

DN 500 / 1

DN 300 / 1.

m3/h cfm1176

588

471

412

353

294

235

176

118

59mft 9.9 11.5 13.1 16.4 19.7 23 26.2

3 3.5 4 5 6 7 8

LWA (dB(A)) Vo (m3/h) ∆p (Pa) Minimum space (m) Xcrit (m) y (m)

Speci�cations: The minimum space for an installation height to 3 m for an air�ow speed in the occupied zone which will not exceed 0.2 m/s The penetration length when in heating mode is ∆T = +10°C. The critical distance for ∆T = - 8°C.

W K D 3 8 1®

4

Per formance diagrams

LWA (dB(A))=

LWA (dB(A))=

LWA (dB(A))=

LWA (dB(A))=

LWA (dB(A))=

max

5

4

3

2

1

6

7

cfmm3/h

94 118

147

176

206

235

294

353

412

471

588

706

824

1000

1176

1353

0.04

0.06

0.08

0.12

0.16 0.20.24 0.40.48 0.6 0.8

0.32

mft

3329.526.2

23

19.7

16.4

13.111.5

9.8

8.2

6.6

4.9

3.9

3.3

2.62.3

2

1.6

13.1 11.5 9.8 8.2 6.6 4.9 3.3 1.6 0

m/s ft/m

in

0.15 30

0.2 40

0.25 50

0.3 60

0.4 80

0.5 100

0.6 120

0.8 160

1 200

.

.

.

.

.

.

.

.

....

Pressure loss ∆pt

Air�

ow tr

ajec

tory

x

Air�ow distance y after blast

Air �

ow velocity V

Example 1

See example 1 on page 7

PaInch of water

Ceiling air�ow rating

Important:Acoustic absorption of the room is not accounted for. For a comparison with north american values, reduce the acoustic power by ten (10) dB. The values are based on an isothermal �ow.

˙Air �ow V0

W K D 3 8 1®

5

Per formance diagrams

LWA (dB(A)) =

LWA (dB(A)) =

LWA (dB(A))=

LWA (dB(A))=

.

.

.

.

LWA (dB(A))=

˙

max

Pressure loss ∆pt

Air �ow V0

Air �ow velocity t V

2

1 5

6

87

Example 3

See example 3 on page 7

cfm

m3/h

59 76 94 118

147

176

206

235

294

353

412

471

588

706

1000

1176

1352

824

Air

�ow

traj

ecto

ry y

ft m

3329.526.223

19.7

16.4

13.111.29.8

8.2

6.6

4.9

3.6

3.3

0.04

0,.06

0.08

0.12

0.16

0.20.24

0.32

0.4 0.48

0.6 0.8

PaInch of water

m/s ft/min

0..15 30

0.2 40

0.25 50

0.3 60

0.4 80

0.5 100

0.6 120

0.8 160

1 200

Vertical free air�ow rating

Important:Acoustic absorption of the room is not accounted for. For a comparison with north american values, reduce the acoustic power by ten (10) dB. The values are based on an isothermal �ow.

W K D 3 8 1®

6

Per formance diagrams

DN 300 - 1 DN 500 - 1

DN 600 -1 /- 2 DN 600 - 3

3

2

4

Example 2

-8°F

-11°F

-15°F

-22°F

m3/hcfm 59 82 100 118 135 153 176 206 235

-8°F

-11°

F-1

5°F

-22°

F

m3/hcfm 153 176 235 294 353 471 588 765 765 1176

-8°F

-11°F

-15°F

-22°F

m3/hcfm 118 135 153 176 206 235 294 353 412 471 588

-8°F

-11°F

-15°F

-22°F

m3/hcfm 294 353 412 471 588 765 941 1176 1471

ft m13.1

11.2

9.8

8.5

7.5

6.6

5.6

4.6

3.9

3.3

2.6

ft m19.7

16.4

14.8

13.1

11.2

9.8

8.5

7.5

6.6

5.6

4.6

3.9

3.,3

ft m19.7

16.4

14.8

13.1

11.2

9.8

8.5

7.5

6.6

5.6

4.6

3.9

3.3

2.6

ft m19.7

16.4

14.8

13.1

11.2

9.8

8.5

7.5

6.6

5.6

4.6

3.9

3.3

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

Tempera

ture

di�ere

nce ∆T 0 =

- 4°C

- 6°C

- 8°C

- 12°C

Criti

cal a

ir�ow

traj

ecto

ry x

crit

Criti

cal a

ir�ow

traj

ecto

ry x

crit

Air �ow V0 .

Tempera

ture

di�ere

nce ∆T 0 =

- 4°C

- 6°C

- 8°C

- 12°C

Tempera

ture

di�ere

nce ∆T 0 =

- 4°C

- 6°C

- 8°C

- 12°C

Tem

perat

ure d

i�er

ence

∆T 0

= - 4°C

- 6°C

- 8°C

- 12°

C

1 See example 2 on page 7

Air �ow V0 .

Air �ow V0 .

Air �ow V0 .

Criti

cal a

ir�ow

traj

ecto

ry x

crit

Criti

cal a

ir�ow

traj

ecto

ry x

crit

Critical air�ow trajectories in cooling mode

W K D 3 8 1®

7

Per formance diagrams

Vertical penetration in heating mode

Example 2Data Nominal size: DN 600 - 1Air �ow: 400 m3/hTemperature di�erence: - 6°C

RequiredCritical air �ow trajectory

SolutionFrom the critical air �ow trajectory we see:xcrit = 1.9 m

Example 3Data Air �ow: 600 m3/hTemperature di�erence: +10°C

Research1. Dimension of the di�user2. Vertical penetration depth in heating mode3. Acoustic power LWA and the total loss of pressure

Solution1. From the “Areas of application” diagram we

read the dimension DN 600 – 12. From the “Vertical penetration in heating

mode” diagram we follow y = 5.5 m3. From the “Horizontal air �ow” diagram we

follow: acoustic power = 48 dB(A) Total loss of pressure = 115 Pa

Note: If there is no modulation and the air is

100% vertical and isothermal to y = 5.5 we read VMAX: 0.48 m/s.

Example 1Data Height of the space: 3 m (10 ft)Maximum speed of the air�ow at head height (1.8m): 0.15 m/sAir�ow Vo: 400 m3/hRequired1. Dimension of the di�user2. Acoustic power LWA, loss of pressure, distance between the di�users.

Solution 1)From the “Areas of application” diagram we read the nominal dimension DN 500 / 1.2)From the “Horizontal air �ow” diagram we follow the DN 500 -1 and for an air�ow of 400m3/h: a. Acoustic power: 60 dB(A) b. Total loss of pressure: 50 Pa c. For y = h – 1.8 = 3.0 m – 1.8 m = 1.2 m

We deduce for v=0.15 m/s a distance between di�users of at least 2 x 1.5m = 3 m.

.5

12

2

1

4

56

78

33

4

1

23

46

57

5°C

Tem

perat

ure d

i�er

ence

∆T 0

= 10°

C15

°C

20°C

30

°C

DN 300-1 DN 500-1 DN 600-1/-2/-3

Vert

ical

pen

etra

tion

dept

h y

max

5°C

Tempera

ture

di�ere

nce ∆T 0 =

10°C

15°C

20°C

30°C

5°C

Temperature di�erence ∆T0 =

10°C

15°C

20°C

30°C

2

34

Air �ow V0 .

9°F

18°F27°F

36°F54°F

9°F18°F

27°F

36°F

54°F

9°F 18°F

27°F

36°F

54°F

m3/hcfm

100 120 130 140 200 230 250 300 350 400 200 230 250 300 350 400 500 600 700 800 1000 250 300 400 500 600 700 1000 1400 1800 2000 59 71 76 82 118 135 147 176 206 235

Air �ow V0 .

m3/hcfm 118 135 147 176 206 235 294 353 412 471 588

Air �ow V0 .

m3/hcfm 147 176 235 294 353 412 588 824 1059 1176

m

1098

7

65.5

54,5

4

3,5

3

2,6

2,3

2

1,7

1,4

ft.

3329,526,2

23

19,718

16,414,813,1

11,5

9,8

8,5

7,5

6,6

5,6

4,6Vert

ical

pen

etra

tion

dept

h y

max

m

1098

7

6

54.5

4

3.5

3

2.6

2.3

2

1.7

1.4

ft.

3329.526.2

23

19.7

16.414.813.1

11.5

9.8

8.5

7.5

6.6

5.6

4.6Vert

ical

pen

etra

tion

dept

h y

max

m

10

9

8

7

6

5

4.5

4

3.5

3

2.6

ft

33

29.5

26.2

23

19.7

16.4

14.8

13.1

11.5

9.8

8.5

W K D 3 8 1®

8

Temp erature and induc tion b ehavior

D imensions

V̇ XY /

V̇

∆T X

Y /

∆T 0

3.3 3.9 4.6 5.6 6.6 7.5 8.5 9.8 11.5 13.1 14.8 16.4 19.7 23 26.2 29.5 32.8mft

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.........

� A

C

ØD

50

ØA

300/1

500/1

600/1

600/2

600/3

300

502

603

603

603

403

403

403

503

603

150

200

250

350

400

133

186

133

134

186

.

� A ØA

BCØD

50

B C Ø D �A/ØA DN

Length of the air�ow direction x ou x+y

Displacement �ow

Axial - Radial Flow

Temperature behavior and the nozzle position’s in�uence on the jet

WKD 381, plenum with top inlet

WKD 381, plenum with side inlet

W K D 3 8 1®

9

Sp eci�c ations

Co di�c ation

1- Description and physical characteristics

1.1 The swirl air di�user shall be made of steel. The square or round di�user shall be equipped with an ajustable nozzle to guide the air �ow.

1.2 The di�user shall be equipped with a turbulence cham-ber composed of a round plate with vertically placed eccentric rollers.

1.3 The di�user adjustment mechanism shall be available in manual and motorized modes.

1.4 The di�user shall be powder coated with a polyester TGIC-free paint, providing a smooth, easy-to-clean, chip and fade resistant �nish. The architect or client shall choose a standard colour from the RAL colour chart.

2 - Performance

The performance shall be guaranted by using performance curves or simulation software for critical areas. These curve shall indicate the pressure drop, acoustic power generated as well as showing a cross-sectional view illustrating the critical air�ow path in cooling, isothermal and heating modes. This critical air�ow path shall have a rated speed at 1.8 m (6 ft) from the ground in occupied area or as requested by the engineer.

3 - Installation

The swirl di�user shall be mounted on a galvanized steel plenum supplied by the manufacturer.

4 - Balancing

4.1 The di�user balancing shall be executed by a ventilation system balancing technician holding a certi�cate of quali�cation.

5 - Quality Requirements: NAD Klima, model WKD 381

WKD 381 Product

ExempleWKD381 - Q - 300 - 300 - 1 - 9003 - T - H

300, 500, 600

300, 502, 603, RND

Nominal dimension

Outer size

Con�guration

Di�user color

Adjustment

Slot height

Plenum

H = Hand adjustmentM = Motorized adjustment

1 = 100 mm2 = 200 mm3 = 300 mm

(DN 600 only)(DN 600 only)

T = Plenum with top inlet S = Plenum with side inlet

9003 = White9010 = Cream00SB = Solar Black (Standard matte black)00SM = Silver Matte (Standard metallic grey)____ = RAL color (write the RAL color number)

Q = Square R = Round

(DN 600 only)

L i s t o f s y m b o l s a n d b a s i c c o n c e p t®

NAD Klima144, rue Léger,

Sherbrooke, QC, J1L 1L9 CanadaT : 819 780-0111 • 1 866 531-1739

F : 819 780-1660sinfo@nadklima.com

NAD Klima Ontario 2840, Argentia Road, Unit 6,

Mississauga, ON, L5N 8G4 CanadaT : 416-860-1067

ontario@nadklima.com

D A L 3 5 8®

®

www.nadklima.com

MADE IN