ltg incorporated swirl diffusers type dla 7 and dla 88... · ltg incorporated swirl diffusers type...

LTG Incorporated

Swirl DiffusersType DLA 7 and DLA 8

LTG Incorporated101 Corporate Drive, Suite DSpartanburg, SC 29303PO Box 2889, Spartanburg, SC 29304USATel: 864--599--6340Fax: 864--599--6344e--mail: [email protected]: http://www.LTG--INC.net

LTG AktiengesellschaftGrenzstrasse 7, D--70435 StuttgartPO Box 40 05 25, D--70405 StuttgartGermanyTel: 49--711--8201--180Fax: 49--711--8201--720e--mail: [email protected]: http://www.LTG--AG.de

DLA7/DLA8-USA-TP-01 (12/02) 419-147

E LTG Incorporated · PO Box 2889 · Spartanburg, SC 29304/USA · 864/599--6340 · Fax 864/599--6344 DLA7/DLA8--USA--TP (12/02)e--mail: [email protected] · Internet: www.LTG--Inc.net · Former editions are invalid. · Subject to technical modifications. 3

Swirl Diffusers can improve the function of air conditioningand ventilating installationsApplicationDiffuserswith swirl characteristics are often used for a di-rect ventilation of occupied zones in commercial and in-dustrial facilities which require high air exchange ratese.g. restaurants, shopping centers, laboratories, offices,meeting rooms.

New swirl diffuser forms of the typeDLAwith adjustableair distributing components offer an attractive, moderndesign and flexibility in terms of air flowpattern. AsDLAdiffusers are easily adjustable the patterns can be set tosuit varying room conditions, even after installation.

The highly inductive, fanned rotational flow makes itpossible to handle high cooling loads and still maintaincomfortable air conditions. This effect is created by flowfrom many individual air jets which make the diffusersuitable for small or large volume flows and variable vol-ume systems.

The recommended installation height is 2.5 ... 5 meters.

Example for the installation of a swirl diffuser type DLA 7

above: type DLA 7 below: type DLA 8


Swirl Diffusers Type DLA 7

FunctionThe LTG Swirl Diffuser type DLA 7 is a highly inductivediffuser which may either be integrated in the ceiling orfree suspended, thus offering a wide variety of possibili-ties and presentation.

AdvantagesDesign / Appearance

- The diffuser plate is available either powder coated, toRAL reference, or chromium plated. The swirl disc isavailable in black or white.

- All metal construction.

Economy / Flexibility

- Fast installation as pattern can be factory--set but subse-quently modified to suit new room conditions.

Comfort

- Good comfort in the occupied zone is ensured by rapiddecay of velocity and temperature difference of the sup-ply jet.

- Direct, efficient, ventilation of occupied zones.

Range of productsModel sizes: (diffuser plate nominal size)square: 400, 500, 600, 625, 800 mmround: 400, 500, 600, 625, 800 mm

Air distribution plenum boxgalvanized sheet steelVersions: pyramid box

rectangular boxcylindrical box

- with adjustable flow restrictor inside the spigot*, adjust-ment from below through the diffuser plate.* not possible with the rectangular spigot connection op-tion.

Duct connectionSide or top entry (the round spigot must be “bayonet”installed by the customer). For small box heights a sideentry rectangular connection is available.

Diffuser plateSteel galvanized, visible side powder coated to RAL ref-erence or chromium plated.

Diffusing componentsSteel galvanized, painted in black or white

Flow typesThe swirl disc canbe set for two flow types : the tangentialflow 1 and 2, or vertical flow.

Tangential flow 1-- standard setting -- the air jets will at-tach strongly to the ceiling resulting in a fully mixed tur-bulent flow structure in the room, with rapid temperatureand velocity decay of the jet.

tangential setting 1 and 2

vertical setting

swirl discdiffuser plate

swirl discdiffuser plate

Tangential setting 2, prefered for lower volume flow ratesand large cooling differentials. The outlet cross--sectionis reduced, thus diffusing the air with increased momen-tum, ensuring that the jet remains powerfully attached tothe ceiling. As a result, induction effect is increased.

Vertical setting, prefered setting during heating opera-tion. In the case of the vertical flow, the air is projectedconocally downwards.

Flow development with:

tangential setting

vertical setting


Swirl Diffusers Type DLA 8

FunctionThe LTG Swirl Diffuser type DLA 8 is a highly inductivediffuser which may either be integrated in the ceiling orfree suspended, thus offering a wide variety of possibili-ties and presentation.

AdvantagesDesign / Appearance

- The diffuser plate is available either powder coated, toRAL reference, or chromium plated. The swirl disc isavailable in black or white.

- All metal construction.

Economy / Flexibility

- Fast installation as pattern can be factory--set but subse-quently modified to suit new room conditions.

Comfort

- Good comfort in the occupied zone is ensured by rapiddecay of velocity and temperature difference of the sup-ply jet.

- Direct, efficient, ventilation of occupied zones.

Range of productsModel sizes: (diffuser plate nominal size)square: 600, 625 mmround: 600, 625 mm

Air distribution plenum boxgalvanized sheet steelVersions: pyramid box

rectangular boxcylindrical box

- with adjustable flow restrictor inside the spigot*, adjust-ment from below through the diffuser plate.* not possible with the rectangular spigot connection op-tion.

Duct connectionSide or top entry (the round spigot must be “bayonet”installed by the customer). For small box heights a sideentry rectangular connection is available.

Diffuser plateSteel galvanized, visible side powder coated to RAL ref-erence or chromium plated.

Diffusing componentsSteel galvanized, painted in black or white

Flow typesThe swirl disc canbe set for two flow types : the tangentialflow or vertical flow.Tangential flow -- standard setting -- the air jets will attachstrongly to the ceiling resulting in a fully mixed turbulentflow structure in the room, with rapid temperature andve-locity decay of the jet.

swirl disc

diffuser plate

swirl disc

diffuser plate

tangential flow

vertical flow

Vertical setting, prefered setting during heating opera-tion. In the case of the vertical flow, the air is projectedconocally downwards.Flow development with:

tangential setting

vertical setting


Swirl Diffusers type DLA 7 and DLA 8

Diffuser plate versions

Model / Design 400 500 600 625 800

DLA 7

Version: square

DLA 7

Version: round

DLA 8

Version: square

DLA 8

Version: round


Selection diagram for DLA 7 with DEU (flow restrictor),model 400, spigot 199 mm (tangential setting)

10

20

30

10

20

30

H = 3,5 m

H > 4 m

H = 3 .. 2,75 m

∆t [K] --12--10--8--6--4

10

20

30

h = 1,8 m

h = 1,8 m

h = 1,8 m

0,511,52345a (cmax) [m]

stated acoustics at tangential setting 1

c max[cm/s] ∆t [K] --12

--10--8--6--4

∆t [K] --12--10--8--6--4

exhaust with diffusing element + 8 dBair mode 90_ without diffusing element -- 12 dB

250 350200 300 400 500

6

810

20

30

405060

80

100

200

V.

α

15

25

150100

25

30

35

40

45

50

--4--6--8--10--12

∆t [K]

∆p [Pa]

[m3/h]

LegendV = volume flow [m3/h]tzu = supply air temperature [°C]tRA = room air temperature [°C]∆t = temperature difference between

supply air and room air [K]∆p = pressure loss [Pa]LWA = sound power level [dB(A)]a(cmax)= spread at which the maximum

speed of the jet airhas been measured [m]

cmax = maximum speed of jet airwith uniformly distributedheat loads [cm/s]

H = installation height [m]

Note:The stated LWA-values are valid for the tangential setting 1.With the vertical setting, the level is 2 dB lower, with thetangential setting 2 the level is 12 dB higher.

Model 400recommended volume flow V [m3/h] 220

recom. height of diffused air H [m] 2.5...5.0

recom. distancebetween two diffusers(distance to wall a/2) a [m]

3.0...3.5

Selection example see page 9



stated acoustics at tangential setting 1exhaust with diffusing element + 3.5 dBair mode 90_ without diffusing element -- 15 dB

10

20

30

10

20

30

H = 3,5 m

H > 4 m

H = 3 .. 2,75 m

∆t [K] --12--10--8--6--4

10

20

30

h = 1,8 m

h = 1,8 m

h = 1,8 m

0,511,52345a (cmax) [m]

c max[cm/s] ∆t [K] --12

--10--8--6--4

∆t [K] --12--10--8--6--4

250 350200 300 400 500 600 V.

α

150

25

30

35

40

45

50

--4--6--8--10--12

∆t [K]

6

810

20

30

405060

80

100

200

15

25

[m3/h]

∆p [Pa]










3.0...3.5



Selection diagram for DLA 7 with DEU (flow restrictor),model 600/ 625, spigot 280 mm (tangential setting)

10

20

30

10

20

30

H = 3,5 m

H > 4 m

H = 3 .. 2,75 m

∆t [K] --12--10--8--6--4

10

20

30

h = 1,8 m

h = 1,8 m

h = 1,8 m

0,511,52345a (cmax) [m]

c max[cm/s] ∆t [K] --12

--10--8--6--4

∆t [K] --12--10--8--6--4

250 350200 300 400 500 600 800

456

810

20

30405060

80100

200

V.

25

30

35

40

45

50

α

15

25

--4--6--8--10--12

∆t [K]

∆p [Pa]

[m3/h]

stated acoustics at tangential setting 1exhaust with diffusing element + 0 dBair mode 90_ without diffusing element -- 13 dB






Selection example in the diagramDLA model 600/625:Vzu = 500 m3/h

∆p = 17 PaLWA = 38 dB(A)∆t = -- 6 Ka(cmax)≈ 2.3 mcmax ≤ 15 cm/sH = 2.75 mNote:The stated LWA-values are valid for the tangential setting 1.With the vertical setting, the level is 2 dB lower, with thetangential setting 2 the level is 12 dB higher.

Model 600/625recommended volume flow V [m3/h] 500


recom. distance between two diffusers(distance to wall a/2) a [m] 3.0...3.5


10

20

30

10

20

30

H = 3,5 m

H > 4 m

H = 3 .. 2,75 m

∆t [K] --12--10--8--6--4

10

20

30

h = 1,8 m

h = 1,8 m

h = 1,8 m

0,511,52345a (cmax) [m]

c max[cm/s] ∆t [K] --12

--10--8--6--4

∆t [K] --12--10--8--6--4

α

200 250 300 350400 500 600 800 1000

V.

2

4

6810

15

2025304050

80100

200

20

30

40

50

25

35

45

1200

--4--6--8--10--12

∆t [K]

∆p [Pa]

[m3/h]


stated acoustics at tangential setting 1exhaust with diffusing element + 5 dBair mode 90_ without diffusing element -- 5 dB










3.0...3.5



10

20

30

10

20

30

H = 3,5 m

H > 4 m

H = 3 .. 2,75 m

∆t [K] --12--10--8--6--4

10

20

30

h = 1,8 m

h = 1,8 m

h = 1,8 m

0,511,52345a (cmax) [m]

c max[cm/s] ∆t [K] --12

--10--8--6--4

∆t [K] --12--10--8--6--4

250 300 350 400 500 600 800 1000

V.

2

4

6

810

15

202530

4050

80100

20

30

40

50

25

35

45

1200

--4--6--8--10--12

∆t [K]

[m3/h]

∆p [Pa]

Selection diagram for DLA 7 with DEU (flow restrictor),rectangular box, model 800, spigot 315 mm (tangential setting)

stated acoustics at tangential setting 1exhaust with diffusing element -- 1 dBair mode 90_ without diffusing element -- 13 dB










3.0...3.5



a (cmax) [m]

c max[cm/s]

∆t [K] --10--8--6--4

∆t [K] --10--8--6--4

∆t [K] --10--8--6--4

α

200 250 300 350400 500 600 800 1000 V.

2

4

6810

15

2025304050

80100

20

30

40

50

25

35

45

--4--6--8--10

∆t [K]

[m3/h]

∆p [Pa]

Selection diagram for DLA 8 with DEU (flow restrictor),pyramid box, model 600/ 625, spigot 280 mm (tangential setting)

stated acoustics are also valid fort vertical settingexhaust with diffusing element + 4 dBair mode 90_ without diffusing element -- 2 dB






Selection example in the diagramDLA model 600/625:Vzu = 700 m3/h∆p = 9 PaLWA = 36 dB(A)∆t = -- 8 Ka(cmax)≈ 2.1 mcmax ≤ 21 cm/sH = 2.75 m



recom. distance between two diffusers(distance to wall a/2) a [m] 2.0...3.0


a (cmax) [m]

c max[cm/s]

∆t [K] --10--8--6--4

∆t [K] --10--8--6--4

∆t [K] --10--8--6--4

α

250 300 350400 500 600 800 1000 V.

2

4

6810

15

2025304050

80100

20

30

40

50

25

35

45

1

--4--6--8--10

∆t [K]

[m3/h]

∆p [Pa]

Selection diagram for DLA 8 with DEU (flow restrictor),pyramid box, model 600/ 625, spigot 315 mm (tangential setting)

stated acoustics are also valid fort vertical settingexhaust with diffusing element + 3 dBair mode 90_ without diffusing element -- 4 dB








recom. distance between twodiffusers (distance to wall a/2) a [m] 2.0...3.0



Swirl diffusers type DLA 7 and DLA 8

53

Hatmodel600/625

C

XDimensions of ceiling diffuser DLAwith pyramid box, circular connection

ca.14model 625 ca.26

G

installation plaster ceiling

installation grid ceiling

ca.14model 625 ca.26

Dimensions air distribution boxDLAwith pyramid box and lateral connection for roundsupply ductsBG 400 500 600 625 800V A* 398 498 598 623 798B 66 118 117 117 230C 228 300 345 345 458Ø d 199 223 279G 279G 279G

E 31 31 31 44 31F 81 81 81 93 81G 26 86 86 86 --H 292 363 375** 375** 575

* Tolerance + 1/ -- 0.5 mm** box executed as pyramid stumpG at DLA 8: Ø d = 314Features

- Minimum loss of energy on the surface.- Stacking boxes with a minimum transport volume.- Integrated flow restrictor, to be adjusted from below,through the diffuser. Delivery in closed position.

- Diffuser plate is delivered separately.- Detached connecting piece enclosed.- Flexible hose connection. For insertion and removal ofthe box, simply tilt. No need to disconnect.

- The pyramid boxes, sizes 400--625, are being fastened inthe center.The air diffuser plate of size 800 is being fastened fromthe outside using 8 screws.

p

Acoustics and drag reduction of flow restrictorPlease consider the flap’s direction of rotation !

The setting of the flow restrictor should be perfor-med according to the direction of rotation shown inthe diagram.


Swirl Diffusers type DLA 7 and DLA8

∅9 (3x)Dimensions of the air distribu-tion box

DLAwith cylindrical box and lateralconnection for round supply ducts.

Dimensions of swirl diffuser DLA, lateral round connection

Model 400 500 600 625 800A* [mm] 398 498 598 623 798

B [mm] 377 477 577 577 777Dimensions DLA circular lateral

H [mm] 300 335 375 375 467Dimensions DLA, circular lateralconnection. Other dimensions on re-

∅ d [mm] 199 223 279 279 279connection. Other dimensions on re-quest.

L [mm] 40 40 60 60 60q

∅9 (3x)

DLAwith cylindrical box and circularconnection from above

Swirl diffuser DLA, round connection from above (sound power level + 3 dB)

Model 400 500 600 625 800A* [mm] 398 498 598 623 798 DimensionsDLA, circular connection

B [mm] 377 477 577 577 777

,from above. Other dimensions on re-quest

∅ d [mm] 199 223 279 279 279quest.

L [mm] 46 66 66 66 66

* Tolerance +1/-0,5 mm


Swirl Diffusers type DLA 7 and DLA 8

Dimensionsof the air distribution box

DLAwith rectangular boxand lateral connection for round sup-ply ducts.

Dimensions of swirl diffuser DLA, lateral round connection

Model 400 500 600 625 800A* [mm] 398 498 598 623 798B [mm] 366 466 566 566 766 Dimensions DLA, circular lateralH [mm] 300 335 375 375 470

Dimensions DLA, circular lateralconnection. Other dimensions on re-

∅ d [mm] 199 223 279 279 279connection. Other dimensions on request.

L [mm] 60 80 80 80 80

q

DLA with rectangular box and lateralrectangular connection (Meinig).

Swirl diffuser DLA, lateral rectangular connection

DLA with rectangular box and circu-lar connection from above.

Swirl diffuser DLA, round connection from above (sound power level + 3 dB)

Model 400 500 600 625 800 DimensionsDLA, circular connection

A* [mm] 398 498 598 623 798

,from above and lateral rectangularconnection Other dimensions on re

B [mm] 366 466 566 566 766connection. Other dimensions on re-quest

∅ d [mm] 199 223 279 279 279quest.

E [mm] 315 400 500 500 710

L [mm] 46 66 66 66 66

* Tolerance +1/-0,5 mm


Swirl Diffusers Type DLA 7 and DLA 8

Installation

The LTG diffuser DLA can be installed flush to ceiling or covering thejoints in intermediate ceilings or freely suspended on the existing suspen-sion holes of the box. The diffuser plate is connected to the air supply boxwith screws.

Installation flush to ceiling for intermediate ceilings, with lateral duct connection. Free suspension above a grid ceiling.

Nomenclature

DLA 600 / Q / D / 7 / P9010 / W / SR / DEUModel(side length or ∅ in mm)400; 500; 600; 625; 800(DLA 8 only model 600 and 625)

Form of diffuser plateQ = squareR = round

Diffusing elementO = exhaust air, without nozzlesD = swirl disc

Version / Design7, 8

Surface of the diffuser plateP .... = powder coated similar to RAL (state RAL number!)

Colour of swirl discS, W, or similar to RAL (state colour code !)

Air distribution box with spigot---- = withoutSR = box with lateral round spigot and flow restrictor (DEU)OR= box with round spigot on top and flow restrictor (DEU)SE = box with lateral rectangular spigot (only rectangular box)P = pyramid box with lateral round connection and flow restrictor (DEU)

Flow restrictorDEU = flow restrictor, adjustable through the diffuser, from below (not possible for box type SE)

ltg incorporated swirl diffusers type dla 7 and dla 88... · ltg incorporated swirl diffusers type...

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