t_2_2_5_fde

Swirl DiffusersType FDEwith fixed air control bladesfor high volume flow rates

T 2.2/5/EN/2

TROX GmbH Telephone +49/28 45/2 02-0Telefax +49/28 45/2 02-2 65

Heinrich-Trox-Platz e-mail [email protected] Neukirchen-Vluyn www.troxtechnik.com

Contents · Description ·Materials

2

Description 2Materials 2Construction · Dimensions · Installation 3Nomenclature 4Acoustic Data 4Aerodynamic Data 5Order Details 6

Type FDE Type FDE-...-H (with plenum box)

DescriptionType FDE swirl diffusers as supply or extract air units are particularlysuitable for comfort areas like office and department stores.

The horizontal swirl type discharge of supply air ensures highinduction and hence rapid reduction in jet velocity and temperaturedifferential.

The air diffusers are suitable for supply air temperature differentialsin the range of +10K to –10K and room heights from 2.80 m.

Swirl diffusers type FDE consist of the square face plate withcontinuous rear perimeter seal, fixed radially arranged air controlblades and the rear frame. The supply air construction also containsa perforated plate mounted on the rear frame to optimise the airdistribution. To obtain low sound power levels especially at highvolume flow rates, the triangular shaped, angled air control bladesextend into the corners of the square diffuser.The plenum box is supplied with side entry spigot. Volume controldamper and/or lip seal are available on request.

MaterialsSwirl diffuser and rear frame with perforated plate are made ofgalvanised sheet steel. The standard finish of the swirl diffuser ispowder-coated white (RAL 9010, gloss level 50 %), any other RALcolour on request (gloss level 70 %) (RAL 9006, gloss level 30 %).Rear frame and perforated plate are powder-coated black (RAL 9005). The plenum box is made of galvanised sheet steel, the lip seal is of rubber.

Construction · Dimensions · Installation

3

Installation

Surface mounting on ceiling

Installation flush to ceiling

Installation with cut outin ceiling

Type FDE swirl diffusers are suitable for flush installation in theceiling.The plenum box is suspended by wires or slotted strips using thedrilled holes provided in the plenum. A self adhesive seal, suppliedloose, must be fitted to the plenum box by the client.The diffuser face is fitted to the plenum box by means of a centrefixing screw located in a cross channel in the plenum box. Thehead of the fixing screw is covered by a decorative cap.

Measuring the Reference PressuresFor simple adjustment of the volume flow, on request the plenumbox can be provided with a test connection for measurement of areference pressure and a volume control damper operated bysheathed cables. The characteristic curve of pressure readingversus volume flow rate for each size of plenum box is supplied.

598

(623

)

598(623)

A A

� K

ØD

� Q

~32

H8

Swirl diffuser type FDE

FDE with plenum box

� Q

546

478

View A-A

6

Suspension by customer

on siteusing holes provided

Seal must be attached to

plenum box by customer

Fixing the diffuser face usingcentre screw

� Test nipple� Plastic tube� Plenum box� Diffuser face� Inclined manometer� Green sheathed cable for closing

the damper� White sheathed cable for opening

the damper� Code

�pw

��

�

�

�

�

�

�

Constructions · DimensionsPlenumSize box ØD H �K �Q

600/625 AK004 248 345 567 Size600/625 AK011 313 410 567 –2 mm

Nomenclature · Acoustic Data

4

1 Sound power level and pressure dropType FDE-A (extract air)

2 Sound power level and pressure dropType FDE-Z (supply air)

‡ in l/s (m3/h): Volume flow rate per diffuserA, B in m: Spacing between two diffusersL in m: Distance horizontal + vertical (X + H1) when discharging

towards the wallX in m: Distance from centre of diffuser to the wallH1 in m: Distance between ceiling and occupied zoneAeff in m2: Effective outlet area 0.04467 m2 (supply air)ƒL in m/s: Max. time average air velocity at the wallƒH1 in m/s: Max. time average air velocity between two diffusers

at distance H1 from the ceiling∆tZ in K: Temperature difference between supply air and room air∆tL in K: Difference between core and room temperature at

distance L = A/2 or B/2 + H1 or L = X + H1

∆pt in Pa: Total pressure dropLWA in dB(A): A-weighted sound power levelLWNC : NC rating of sound power levelLWNR : LWNR = LWNC + 2LpA, LpNC : A-weighting and NC rating respectively of room sound

pressure levelLpA ~ LWA -8 dBLpNC ~ LWNC -8 dB

� in °: Damper angle

Nomenclature

25

l/s

m3/h

Dru

ckve

rlust

∆p

t in

Pa

5

10

‡

15

20

30

40

50

100

120 150 200 250 300 400 450

600 800 1000 1200 1400 1600

350

30

35

40

45

50

25

30

35

40

45

LWA in

dB(A

)

LWNC

AK004

AK011

440

l/s

m3/h

Dru

ckv

erlust

∆p

t in P

a

5

AK004

AK011

25

120 150 200 250 300 350 400 450

440 600 800 1000 1200 1400 1600

30

35

40

45

50

55

LWA in

dB(A

)20

25

30

35

40

45

50

10

15

2530

40

50

100

20

LWNC

‡

H

Pre

ssur

e d

rop

∆p

tin

Pa

Pre

ssur

e d

rop

∆p

tin

Pa

Correction to diagram 1: Volume control damper settingPlenum box AK004

FDE-A 45° 90°

∆pt x 2 x 5.2

LWA +5 +11

LWNC +5 +10


FDE-A 45° 90°

∆pt x 1.5 x 3.5

LWA +1 +5

LWNC +1 +5


FDE-Z 45° 90°

∆pt x 1.6 x 3.4

LWA +5 +11

LWNC +10 +17


FDE-Z 45° 90°

∆pt x 1.3 x 2.6

LWA +2 +5

LWNC +2 +5

Aerodynamic Data

5

ExampleData given:

A room (10 x 10 m) to be equipped with 4 FDE-Z-H/625 x 313square difusers with spacing 5 m between the diffusers and 2.5 m to the wall. The diffusers are mounted at 3.6 m height, i.e. 1.9 m above the occupied zone. The air change rate has tobe 10 per hour. The room attenuation is 8 dB.

In the cooling mode the supply air temperature is -10K.

Questions:Is this possible with acceptable noise levels and comfort critera?What is the pressure drop created by the diffusers?

Procedure / results:‡tot = 10 m ·10 m · 3.6 m · 10 h-1 = 3600 m3/hper diffuser ‡ = 900 m3/h (250 l/s)

Diagram 2 (page 4):LWA = 39 dB(A), ∆pt = 24 PaSound pressure level in the room LpA = 39 dB(A) + 6 dB(A) (increase for 4 diffusers)-8 dB(A) (room attenuation)= 37 dB(A)Acceptable noise level

Diagram 5:A = 5 m and ‡ = 900 m3/hH1 = 3.6 m – 1.7 m = 1.9 mƒH1 = 0.12 m/sAcceptable comfort conditions

Diagram 6:L = X + H1 = 2.5 m + 1.9 m = 4.4 mƒL = 0.23∆tL/∆tZ = 0.072∆tL = 0.072 · (-10K) = -0.72KThe air velocity in the occupied zone at a distance of 0.5 m fromthe wall is approx. 0.5 · ƒL = 0.12 m/s

3 Air velocity, diffuser arrangement more than one row,if B = 4.0 m

4 Air velocity, diffuser arrangement single row or morethan one row, if B � 6.0 m

0.10

0.15

0.20

0.25

0.30

0.40

H1=1.0

1.8

1.2 1.6 2.4 m2

350

250

200

150

125

300

400

l/s (m3/h)

(450)

(540)

(720)

(900)

(1080)

(1260)

(1440)

2.4 3 4 5 6 7 8

ƒ H1

in m

/s

Spacing A in m

‡=100 (360)

0.10

0.15

0.20

0.25

0.30

0.40

H1=1.0

1.8

1.2 1.6 2.4 m2

350

250

200

150

125

300

400

l/s

‡=100 (360)

(m3/h)

(450)

(540)

(720)

(900)

(1080)

(1260)

(1440)

2.4 3 4 5 6 7 8

ƒ H1

in m

/s

Spacing A in m

6 Air velocity with square arrangement of diffusers (A = B)

5 Air velocity and temperature quotient at the wall

0.15

A=1.8 3 5.4m

1.8

0.20

0.25

0.30

0.40

0.50

0.60

0.02

0.03

0.04

0.05

0.06

0.08

0.10

0.12

Tem

per

atur

e q

uotie

nt ∆

t L /

∆t Z

Distance L in m

100150

200250

‡ = 400 l/s

350

(1440m3/h)

300

(1260)

(1080)

(900)(720)(540)

(360)

ƒ L in

m/s

2.4 3 4 5 6 7 8

2.4

∆tZ∆tL

3.6

H1=1.0 1.2 2.4 m

Spacing A or B in m

1.8

0.40

0.30

0.25

0.20

0.15

1.6 2

0.10 2.4 3 4 5 6 7 8

ƒ H1

in m

/s

l/s(m

3/h)

300‡ = 400

200150125100

(1440)

(1080)

(720)

(540)

(450)(360)

Order DetailsD

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ange

s re

serv

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right

s re

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TR

OX

Gm

bH

(8/2

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6

Specification textType FDE swirl diffuser with square face and fixed air controlblades for swirling horizontal discharge with high induction.Diffuser face consists of angled triangular shaped bladeswhich extend into the corners includes a rear mounted frame complete with perforated plate to optimise the airdistribution.Type FDE swirl diffuser is supplied with plenum box and – on request – with damper and/or lip seal.Also on request to measure the reference pressure theplenum can be provided with a sheathed cable adjustedvolume control damper and measuring nipple.The diffuser face is fitted and removed by means of a centralscrew into a channel section in the plenum.

MaterialsDiffuser face and rear frame with perforated plate are madeof galvanized sheet steel.The surfaces are pre-treated (ET-L grey-white RAL 9002) and powder-coated white (RAL 9010, gloss level 50 %), or, if required, any other RAL colour (gloss level 70 %) (RAL 9006, gloss level 30 %). Rear frame and perforatedplate are powder-coated black (RAL 9005).The plenum box is made of galvanised sheet steel, the lipseal is of rubber.

Order Code No specification for standard construction

/ / / / /FDE - Z - H - M - L 625 x 248 0 0 P1 RAL 9016

Order exampleMake: TROX Type: FDE-Z-H-M-L / 625 x 248 / P1 / RAL 9016

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0 Standard finishpowder-coated to RAL 9010 (GE 50%)1)

P1 Powder-coated to RAL 9006 (GE 30%)1)

other colours to RAL . . .(GE 70%)1)

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State colour

Not used600 x 248600 x 313625 x 248625 x 313Size x Ø D

Supply air ZExtract air A

Universalplenum box H

Volume control damper M

Volume control damperwith test nipple MN

Spigot with lip seal L

1) GE = gloss level

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