Swirl Diffuser Type VDW
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2/7/EN/6 Swirl Diffuser Type VDW recommended for room heights from approx. 2.60 ... 4.00 m

Description 2Discharge Characteristics > In addition to the existing range of TROX swirl diffusers, thetype VDW swirl diffuser with manual adjustment has been developed. This enables the direction of discharge to be altered on site to cater for changes in room layout or partitions. Due to the rotary swirling motion of the air discharge, induction of roomair occurs very quickly, resulting in a rapid decay of supply air velocity and temperature differential. Air change rates of 30 per hour can be achieved with supply air temperature differentials of +10K to ז10K. The diffuser can be supplied...

The flow visualisation opposite shows the air dischargecharacteristics, control blades set for internal swirl. > External swirlVerticalInternal swirl(normal position)air discharge > for sizes 300x8, 400x16, 500x24, 600x24 and 625x24 All air control bladesAir control blades setAir control blades in each quartile ofset to external swirlhalf to external andface are set in the same direction, adjacenthalf internal to swirlquartiles set one internal one external swirl >

300 298 600625 598 623 400 398 Test nipple Inclined manometer Plastic tube Code White sheathed cable damper open Diffuser face > 500 498 Green sheathed cable damper closed Plenum box >

The face plate is in galvanised sheet steel. The surfaces arepre-treated and powder coated white (RAL9010).The control blades are made from Polystyrol (PS 476L),with black (similar to RAL 9005) as standard or white (similar to RAL 9010) on request.The plenum box is made from galvanised sheet steel, therubber lip seal. All sizes are suitable for flush mounting into a ceiling.If the diffuser is installed below a closed ceiling (i.e. freelysuspended) a stable discharge can be achieved if a peripheral collar 50 mm is provided available onrequest. > The plenum box is suspended using wires or...

Vin l/s:Supply air volume per diffuserV׷in m > 3 /h:Supply air volume per diffuserA, Bin m:Spacing between two diffusers Xin m:Distance between diffuser centre and wallH > 1 in m:Distance between ceiling and occupied zonev- > H1 in m/s:Time average air velocity between two diffusersat distance from ceiling H > 1 Lin m:Horizontal + vertical distance (X+H > 1 )discharge to the wallv- > L in m/s:Time average air velocity at wall t > Z in K:Temperature difference between supply airand room air t > L in K:Difference between core and room temperatureat distanceL = A/2 + H > 1 orL = B/2 + H > 1...

in Pa t p in Pa t p Pressure drop Pressure drop in Pa t p in Pa t p Pressure drop Pressure drop

15010070 2010720305070150l/s100150200300400m 15010070 201074070100200300l/s200300400500m in Pa in Pa t t 5030 500 5030 900 p p in dB(A) L WA in dB(A) 202530354045L Pressure drop WA Pressure drop L 15 1540 10040 1540 15050 202530354045L 20253035404550 WNC 15 253035404550 WNC 200 400 3 /hV 3 /hV׷ 7001200

100702010750070100200300l/s4002200300500m 1007020107500100200300l/s40022003000500m 5030 1200 5030 1200 in Pa in Pa t t p p in dB(A) 1540 150 in dB(A) L WA 1540 150700 WA Pressure drop 202530354045L Pressure drop 202530354045L L 253035404550 15 253035404550 15 20 20 WNC WNC 700 1000 3 /hV׷ 90016004 3 /hV 90016004

Size Size in Pa in Pa t t p p Pressure drop Pressure drop Size Size in Pa in Pa t t p p Pressure drop Pressure drop

Correction!For an installation below a continuous ceiling, the valuesv > L , and t > L / t > Z must be multiplied by a factor of 0.71! > Diffuser arrangement: Temperature Quotientsingle row or more than one row ifB 4.00 m Z t / L t Temperature Quotient Spacing A Distance L Diffuser arrangement: Square diffusermore than one row if B = 3.00 m Spacing A Spacing A 13 >

Correction!For an installation below a continuous ceiling, the valuesv > L , and t > L / t > Z must be multiplied by a factor of 0.71! > Diffuser arrangement: Temperature Quotientsingle row or more than one row if B 4.00 m Z t / L t Temperature Quotient Spacing A Distance L Diffuser arrangement: Square diffusermore than one row if B = 3.00 m Spacing A Spacing A or B 14 >

Correction!For an installation below a continuous ceiling, the valuesv > L , and t > L / t > Z must be multiplied by a factor of 0.71! > Diffuser arrangement: Temperature Quotientsingle row or more than one row if B 4.00 m Z t / L t Temperature Quotient Spacing A Distance L Diffuser arrangement: Square diffusermore than one row if B = 3.00 m Spacing A Spacing A 15 >

L should not exceed0.2 m/s. The regenerated noise level of each diffuser is limited to L Data given:A hall measuring BxLxH = 24mx24mx3.40m is to be designed using VDW swirl diffusers for supply air.Total volume flow rateV=16000 l/s (57600 m > WA = 30 dB(A).Initial observation:Since the diffusers have to be arranged at a distance of X = 3 m from the external facade, the remaining area available for installation is 18 m x 18 m. Consider a distance between rows B = 3.0 m This results in 7 rowsV׷per row = 16000 l/s 2280 l/s7For spacing of diffusers along the rows select A = 1.0 m.This results...

Diagram 11:Sound power level and pressure dropL > WA =27 dB(A) (L > WNC = 21 NC) p > t =12 PaDiagram 36:Square diffuser: more than one rowif B = 3.00 mH > 1 =H 1.70 = 1.70 mv > H1 =0.17 m/sDiagram 37:Temperature QuotientL=H > 1 + A/2 = 2.20 mbetween two diffusers t > L / t > Z =0.05 t > L =֖ 8 x 0.05 = 0,4 KL=H > 1 + X = 4.70 mat the wallv > L =0.18 m/s t > L / t > Z =0.023 t > L =֖ 8 x 0.023 = 0.2 K Result:133 off VDW- Q - Z - H / 600x24 At the required air change rate of 30 per hour, the noiselevel requirements are met and the limiting air velocities not exceeded. Correction!For an...

Correction!For an installation below a continuous ceiling, the valuesv > L , and t > L / t > Z must be multiplied by a factor of 0.71!For adjustment of blade rings for external swirl, the diagram values must be multiplied by 1.25! > Diffuser arrangement: Temperature Quotientsingle row or more than one row if B 4.00 m Z t / L t Temperature Quotient Spacing A Distance L Diffuser arrangement: Square diffusermore than one row if B = 3.00 m Spacing A Spacing A or B 18 >