July 09 Floor Swirls Floor Swirls Models BZD and SZD Features Model BZD Circular Floor Swirl Model SZD Circular Step Diffuser Grilles Diffusers Louvres Chilled Beams Ruskin Air Management Limited www.ruskinuk.co.uk
Floor Swirls Contents Model BZD Model BZD Circular Swirl Diffuser, having a perforated steel front plate, incorporating a secondary swirl device suitable for most floor applications. Pages 3 9 Model SZD Circular Diffuser having a perforated steel front plate and connecting spigot suitable for most low sidewall/step applications. Pages 10 12 Application The floor diffuser BZD is an air diffuser that can be mounted flush with the floor and be used from low to average temperature differences between supply air and room air. The diffuser can be used for cooling and heating with a maximum temperature difference of approximately 6K. Sizes BZD 0/125 0 Two types of floor diffusers BZD 0 are available: BZD is a diffuser for light load, e.g. underneath permanently fixed seats in cinemas, theatres and concert halls. The supply grille, which is the perforated top element of the diffuser, is manufactured from either steel, powder coated (BZD-N) or stainless steel (BZD-E). BZD 0/160 125 0 BZD + BG incorporates reinforcement for heavy duty (»domestic«according to the European standard for static loading criterias) in open floor areas. Function The supply air is discharged from the diffuser in eight swirling jets, which flow along the floor. The air movement is distinguished by a low air velocity without draughts. BZD 250/225 160 250 The primary induction at the centre point of the diffuser already reduces the temperature difference between supply air and room air as the air is discharged from the diffuser. This primary induction enables the diffuser to operate at a higher temperature difference than is normally possible in the case of floor diffusers. 160 2 www.air-diffusion.co.uk
Floor Swirl Model BZD Model BZD Construction BZD 0 The diffuser BZD 0 consists of inlet spigot (1) with integral swirl diffuser (2). The perforated top element is manufactured from steel (3) and is fitted above the swirl diffuser. The heavy duty type incorporates reinforcement (4). The dirt trap manufactured from steel (5) together with the internal control damper can be fastened to the inlet spigot by means of a bayonet lock. Components BZD 0 3 4 2 1 5 6 A 70 Ø D Ø C outside Ø D1 Ø 2 3 cross-slotted hexagon head screws M4 x (A - 10) h 10 Mounting flange Floor diffuser BZD 0 Non-reinforced diffuser BZD-N (perforated top element of the diffuser manufactured from steel and powder coated) BZD-E (perforated top element of the diffuser manufactured from stainless steel) Floor diffuser BZD 0 Reinforced diffuser BZD-N+BG BZS-E+BG Dirt trap SF Damper ring D 7 Ø d Ø 3 Counterflange 3 clamps staggered by 1 Back plate MB Dimensions BZD 0 Component Dimension BZD (mm) 0/125 0/160 D 198 198 C 123 158 D1 1 165 h 90 125 d 150 170 Back plate with floor clamps MR Plenum box AK www.air-diffusion.co.uk 3
Floor Swirl Model BZD Model BZD Construction and dimensions BZD 250/225 The construction of size 250 is similar to size 0. However, the dirt trap is fastened to the diffuser with a centre screw. Size 250 has a one-piece back plate with three clamping screws fastened to the floor tile. Custom-made mounting frames are available for special installation situations. Design and surface treatment of the supply grille The supply grille, which is the perforated top element of the diffuser, is either powder coated or manufactured from stainless steel (standard). The stainless steel surface can be rolled or treated with glass beads. The perforation of the supply grille can be either 5.5mm or 4.5mm in diameter. Ø 256 12 70 Ø 223 Floor diffuser BZD 250/225 5.5mm perforated face with centre screw, rolled stainless steel surface Ø 224 inside 105 Dirt trap for BZD 250/225 Ø 280 Ø 257 4.5mm perforated face with clamp fastening at the side 80 Back plate for BZD 250/225 4 www.air-diffusion.co.uk
Floor Swirl Model BZD Model BZD Performance Functional diagram To represent the function of the floor diffusers Type BZD, Figure 1 and 2 show the vertical sections for the temperature and velocity distribution for the diffuser BZD 0/125 by calculating the flow simulation. Volume flow: 17 l/s. Temperature difference supply air/room air: 3 K for cooling Fig. 1. Vertical section of velocity distribution BZD 0/125 Volume flow: 17 l/s, temperature difference: 3 K for cooling. Fig. 2. Vertical section of temperature distribution BZD 0/125 Volume flow: 17 l/s, temperature difference: 3 K for cooling. www.air-diffusion.co.uk 5
Floor Swirl Model BZD Model BZD Performance Air velocities The swirling jets of the discharged supply air right above the floor causes a quick reduction of air velocity in the horizontal plain. The maximum air velocities are at a height of 50mm. Fig. 3 and Fig. 4 show for BZD 0 and BZD 250 the distance, up to which the air velocity at a height of 50mm is decreased to 0.2 m/s. The values are valid for cooling with 3 K. Fig. 5. Local air velocities for BZD 0 at a distance of 450 mm to the centre of the diffuser for volume flows from 8-17 l/s with also 3 K for cooling. Decrease in temperature difference supply air/room air Fig. 6. The rapid reduction in temperature difference and percentage decrease of the temperature difference supply air/room air for BZD 0 for volume flows between 11 and 22 l/s across the distance from the centre of the diffuser. The values are valid for temperature difference between 2 and 4 K. 11 12 14 16 18 22 242628 [l/s] 9 10 11 12 13 14 15 16 [l/s] Distance to diffuser centre [m] 0.8 0.6 0.4 0.3 0.2 0.1 11 14 17 22 28 Air velocity [m/s] 0. 0.16 0.12 0.10 0.08 0.06 0.04 0.02 H = 50 H = 100 8 11 14 17 Decrease in temperature difference [%] 100 80 60 40 0 0.1 0.2 0.4 0.6 0.8 1.0 V = 11 l/s V = 17 l/s V = 22 l/s Volume flow V [l/s] Volume flow V [l/s] Distance to diffuser centre [m] Fig. 3. BZD 0, distance from the centre of the diffuser to the point, at which the air velocity at a height of 50mm is reduced to 0.2 m/s. Fig. 5. BZD 0, local air velocity at a distance of 450mm from the centre of the diffuser for volume flows from 8 to 17 l/s. Fig. 6. BZD 0, percentage reduction of the temperature difference supply air/room air across the distance from the centre of the diffuser. Distance to diffuser centre [m] 1.5 1.4 1.2 1.0 0.8 0.6 23 26 34 38 42 24 28 32 36 40 44 l/s 0.4 22 28 33 39 44 Volume flow V [l/s] Fig. 4. BZD 250, distance from the centre of the diffuser to the point, at which the air velocity at a height of 50mm is reduced to 0.2 m/s. 6 www.air-diffusion.co.uk
Floor Swirl Model BZD Model BZD Performance Noise level and pressure loss The noise level in NR L w and pressure loss in Pa are shown in Figures 7 to 9. 12 14 16 18 22 24 26 28 32 [l/s] 23 24 26 28 32 34 36 38 40 42 44 [l/s] Pressure loss Δpt [Pa] 60 50 40 25 35 Pressure loss Δpt [Pa] 40 25 35 10 Lw [NR] 10 15 Lw [NR] 5 11 17 22 28 33 Volume flow V [l/s] 5 22 28 33 39 44 Volume flow V [l/s] Fig. 7. BZD 0/125, pressure loss and noise level. Fig. 9. BZD 250/225, pressure loss and noise level. 12 14 16 18 22 24 26 28 32 [l/s] Pressure loss Δpt [Pa] 60 50 40 15 25 Lw [NR] 35 10 5 11 17 22 28 33 Volume flow V [l/s] Fig. 8. BZD 0/160, pressure loss and noise level. www.air-diffusion.co.uk 7
Floor Swirl Model BZD Model BZD Installation Options Ø 0 1 Installation into raised floors: Air supply via raised floor plenum. Installation into raised floors: Air supply via individual connection with plenum box. Ø 0 50 Ø 261 0 160-380 150 Special BZD 250 for a low noise level with special mounting frame. Ø 1 400-660 Special BZD with long dirt trap and acoustic chamber. 80 Ø 0 Special BZD for heavy duty and low noise level with special mounting frame. Ordering Information Example Model and Finish Fixing Accessories Size BZD-E Central Screw SF and D 0/160 BZD-E - Perforated Plate in Stainless Steel BZD-N - Steel Perforated Plate, Power Coated to RAL Colour Fastening via central screw Clamp fastening using rim BG - Reinforcement for light load (domestic) MR - Back Plate SF - Dirt Trap D - Damper Ring MR - Back Plate with wall clamps 0/125 0/160 250/225 AK - Plenum Box Important Note: All orders must be addressed to Air Diffusion, Ruskin Air Management Limited. 8 www.air-diffusion.co.uk
Floor Swirl Model SZD Model SZD Staircase Riser Application The staircase diffuser SZD is designed for draught-free introduction of supply air into cinemas, theatres, lecture halls and other assembly rooms. It is vertically mounted into the steps and introduces the supply air near the ground. The staircase diffuser SZD 125 is used for volume flow rates from 6 to 11 l/s with temperature differences between supply air and room air of up to ±6 K. Construction The visible part of the staircase diffuser is a round (or square) perforated plate, behind which the diffuser with 8 blades (2) and inlet spigot (3) is located. The perforated plate (4) is used as flow straightener as well as a variable flow controller. Function The swirling jets leave the diffuser with radial action and flow towards the floor. The air velocity and temperature difference is rapidly reduced. This guarantees draught-free conditions at a short distance between the diffuser and legs of the audience. Mounting Two types of installation are possible: Front mounting: SZD 125F The diffuser is screw fixed to the front side of the step and is then fastened to the diffuser perforated plate. Insertion into ductwork: SZD 125R The entire diffuser is inserted into a duct having an inside diameter of 125mm and fastened by tightening the middle screw. This enables an easy, quick and extremely inexpensive mounting procedure. Ø150 8 70 1 2 Ø123 Ø125 Insertion into ductwork : SZD 125 R Ø150 Outside Ø1 3 hole Ø 4 staggered by 1 3 4 67±1 Ø123 Ø125 Front mounting: SZD 124 F www.air-diffusion.co.uk 9
Floor Swirl Model SZD Model SZD 600mm Velocity profile vs. supply flow rate 0.0 Velocity profile vs. supply flow rate The staircase diffuser type SZD is usually used with a volume flow between 5 and 11 l/s. Figure 1 shows the velocity profile of 0.2 m/s for 6, 8, 11 l/s at a temperature difference of 3 K (cooling) between supply air and room air at a height of 100mm. m 3 /h 5.6 l/s m 3 /h 8.3 l/s 40 m 3 /h 11.1 l/s 0.2 0.4 0.6 0.8 m The staircase diffuser type SZD is usually used with a volume flow between 6 to 11 l/s. Figure 1 shows the velocity profile of 0.2 m/s for 6, 8, 11 l/s at a temperature difference of 3 K (cooling) between supply air and room air at a height of 100mm. 1.0 0.8 0.6 0.4 0.2 0.0 0.2 0.4 0.6 0.8 Figure 1 Pressure loss and noise level Figure 2 shows the pressure loss and noise level for the individual diffuser against volume flow. The diffuser resistance can be varied without affecting the noise level by changing the free air of the perforated plate. pressure loss Δp t [Pa] 80 60 50 40 10 15 L w [NR] 25 perforated plate F 0 = % perforated plate F 0 =32% 5 6 7 8 Figure 2 40 50 60 m 3 /h 9 10 12 14 16 l/s Volume flow V Ordering Information Example Model Finish Fixing Size SZD White (RAL9010) Duct Mounting 125 SZD- Standard stair riser consisting of a perforated front plate, base plate having punched swirl vanes and an inlet spigot of 125mm diameter. Standard finish is powder coat white to RAL9010 Fastened to duct using diffuser spigot Front fastening using spigot screws 0/125 0/160 250/225 Important Note: All orders must be addressed to Air Diffusion, Ruskin Air Management Limited. 10 www.air-diffusion.co.uk
Floor Swirls Product Range Modular Active Chilled Beams Ceiling Swirl Diffusers Displacement Ventilation Units High Induction Slot Diffusers Square Louvre Face Diffusers Perforated Diffusers Linear Slot Diffusers Fixed Blade Linear Diffusers Cylinder Jet Diffusers Jet Nozzle Diffusers Circular Adjustable and Fixed Diffusers Air Valves Panel Floor Grilles Linear Floor Grilles Floor Swirl Diffusers Wall and Ceiling Grilles External Weather Louvres Systempac Fan Coil Unit and Diffuser Package www.air-diffusion.co.uk 11
Model Floor Swirls SA Louvre Face Ceiling Diffuser Ruskin Air Management Limited a BS EN ISO 9000 registered company The statements made in this brochure or by our representatives in consequence of any enquiries arising out of this document are given for information purposes only. They are not intended to have any legal effect and the company is not to be regarded as bound thereby. The company will only accept obligations which are expressly negotiated for and agreed and incorporated into a written agreement made with its customers. Due to a policy of continuous product development the specification and details contained herein are subject to alteration without prior notice. Ruskin Air Management Limited Stourbridge Road, Bridgnorth, Shropshire, WV15 5BB England. Tel: 01746 761921 Fax: 01746 760127 Email: sales@air-diffusion.co.uk Website: www.air-diffusion.co.uk BROCHURE PRODUCTION www.geoffstrange.co.uk