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Slot Diffuser

Slot Diffuser
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Slot Diffuser Type VSD15 with 15 mm wide diffuser face 2/1/EN/4 TROX GmbH Telephone +49/28 45/2 02-0 Telefax +49/28 45/2 02-2 65 Heinrich-Trox-Platz e-mail trox@trox.de D-47504 Neukirchen-Vluyn www.troxtechnik.com

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Contents 2 Air Diffuser Discharge Characteristics (horizontal) 2 Description 3 Air Diffuser Discharge Characteristics (alternating) 3 Construction · Dimensions 4 Materials 4 Installation · Assembly 5 Air discharge horizontal, right Air discharge horizontal, left Nomenclature 7 Acoustic Data 7 Spectral Data 7 Aerodynamic Data 8 Order Details 11

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3 Description The recommended volume flow range is 8 to 25 l/s/m with a supply air temperature difference of up to ± 10 K. Because of their stable discharge characteristics, slot diffusers are suitable for use in systems with constant or variable volume air flows. The direction of air discharge can be adapted to the room conditions required. The air control blades are set as specified on the order. If the discharge direction has to be subsequently changed, this can easily be done by rotating the air control blades on site. The type VSD15 slot diffuser is ideal for use where suspended...

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Construction · Dimensions · Materials 4 Construction The diffuser is supplied with the rear-mounted plenum box, which, if required, can be fitted with internal acoustic lining. The plenum has circular side entry spigot into which can, if required, be fitted volume control damper which can be adjusted from the diffuser face. The integral border, Z0, can be supplied for constructions A, F and D versions. Materials The diffuser face consists of aluminium extruded section. The visible surfaces of VSD15 are black (RAL 9005), powder coated. Visible surfaces of VSD15-Z0 natural anodised (E6-C-0)....

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5 Installation · Assembly Fig. 1 Slot diffusers of type VSD15 are also suitable for mounting onto the sides of light troffers. The method of fixing and components required must be agreed. All necessary provisions/components will then be supplied by Trox, i.e. inserts, clamping angles etc. Fig. 4 shows an example with clamping angle and threaded insert. Fig. 2 Standard installation of slot diffusers using 4 suspension brackets fitted to the plenum box. Fig. 3 When slot diffusers are to be installed in panelled ceilings with external radius R 10 mm, they can be mounted up to 7 mm above the...

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Installation · Assembly 6 Fig. 7 The air flow rate can be adjusted from the diffuser face. The air control blade under the spigot should be rotated until the damper can be adjusted by a screwdriver or rod (max. 3.5 mm, approx. 100 mm long). The control blade can then be reset. Fig. 5 When slot diffusers are fitted in a linear format, connecting pins are used to align the front face. The connecting pins (2 per section) are first inserted into one section and then pushed halfway into the other section. Fig. 6 For an airtight seal on the first and last diffuser in a linear format, an end seal...

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7 Nomenclature · Acoustic Data · Spectral Data Nomenclature V . in l/s · m: Volume flow per unit length V . in m3/h · m: Volume flow per unit length V . t in l/s: Total volume flow V . t in m3/h: Total volume flow A in m: Spacing between two diffusers H1 in m: Distance between ceiling and occupied zone H1 max in m: Max. penetration depth when heating L in m: Distance from diffuser L = A/2 + H1 or L = X + H1 v– H1 in m/s: Time average air velocity between two diffusers at distance H1 from the ceiling v– L in m/s: Time average air velocity at the wall at distance L veff in m/s: Effective jet...

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Aerodynamic Data Air discharge: horizontal one direction 8 Example Data given: VSD15 Slot length L1 = 1000 mm Total volume flow V . t = 15 l/s Required: Octave band sound power level for regenerated noise LW 2 Air velocity between two diffusers and at the wall 3 Temperature Quotient Diffuser Layout Diagram 1: Sound power level and pressure drop LWA = 24 dB(A) pt = 18 Pa Effective jet velocity veff: veff= = = 3.75 m/s V . t seff · L1 · 1000 15 0.004 · 1 · 1000 Effective jet velocity V . t in l/s vt eff= = [m/s] V . t seff · L1 · 1000 V . t in m3/h seff = 0.004 m L1 = length of slot diffuser...

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9 Aerodynamic Data Air discharge: alternating, horizontal Example Data given: VSD15; air discharge horizontal, alternating Slot length L1 = 1000 mm Volume flow per unit length . V = 15 l/s · m Supply air temperature differential horizontal for cooling tZ = – 10 K Spacing between diffusers A = 2.0 m Distance between ceiling and occupied zone H1 = 1.0 m Distance between diffuser centre line and wall X = 2.4 m Diagram 1: Sound power level and pressure drop LWA = 24 dB(A) (LWNC = 18 NC) pt = 18 Pa Diagram 4: Air velocity between the two diffusers v– H1 = 0.12 m/s Diagram 5: Temperature quotient...

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Aerodynamic Data Air discharge: alternating, angled 10 Example Data given: VSD15; air discharge alternating, angled Slot length L1 = 1000 mm Volume flow per unit length . V = 15 l/s · m Supply air temperature differential tZ = – 8 K or + 8 K Spacing between diffusers A = 2.4 m Distance between ceiling and occupied zone H1 = 1.2 m Diagram 1: Sound power level and pressure drop LWA = 24 dB(A) (LWNC = 18 NC) pt = 18 Pa Diagram 7: Air velocity between the two diffusers v– H1 = 0.19 m/s Diagram 8: Temperature quotient for cooling tH1/tZ = 0.042 tH1 = 0.042 · (– 8) = – 0.336 K for heating tz = +...

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11 0 Standard finish VSD15 black RAL 9005 VSD15-Z0 E6-C-0 P1 Powder-coated to RAL 9006 (GE 30%)2) other colours to RAL … (GE 70%)2) Note! Black air control blades standard. If required state “Air control blades white“ (similar RAL 9010). Order Details Order Code VSD15 -A-M- Z0 - L 900 600 700 800 900 1000 1100 1200 1300 1400 1500 L1 (mm) / / / Plenum box A Plenum box with lining D Face section F Volume control damper M1) Integral border Z0 Spigot with lip seal L1) 1) Only for construction with spigot 2) GE = gloss level 0 Not used State colour HL Horizontal left HR Horizontal right WH...

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