Design Guide
General information Ceiling Swirl Diffuser Design Guide General information 2-3 Product selection 4 Operational characteristics 5 Applications - general guidelines 6-9 Easy Product Finder - Room Wizard Operation 10-11 Air distribution systems 12 Swirl diffuser advantages over traditional diffusers Allow lower distances between diffusers Allow higher volume flow per square of surface of the ambient Higher volume of air changes per hour making them and ideal solution for clean room applications Can be installed in rooms with a height of up to 13 ft (4m) with air Δt ±18 F (10K) - with some swirl diffuser models designed for a higher ceilings Ideal for low-ceiling spaces of 7.8 ft (2.4m) Can be freely suspended in the space while still maintaining air distribution pattern (consult TROX USA engineers for more details) Can be mounted above reticulated ceilings keeping a minimum distance of 0.5 ft (150mm) Ideal solution with VAV systems Ventilation Technology Air change rate/h 10 10-20 20-30 Volume flow control Key CAV: constant air volume system VAV: variable air volume system ROOM HEIGHTS UP TO 13 ft (4 m) Grille Slot diffuser Swirl diffuser Ceiling diffuser Swirl diffuser w/ perforated plate CAV + + + + + + + + + + VAV + + + + + + CAV + +* + + + + + + VAV + +* + + + + CAV + + VAV + + + + Very well suited + Well suited Not suitable * Horizontal discharge on alternating sides 2 01/2016 US
General information TDF Metal blades Horizontal discharge Made in the USA Made in the USA TDV Adjustable plastic blades Horizontal discharge Manufactured in USA VDW Adjustable plastic blades Horizontal discharge VDL Adjustable horizontal/vertical discharge Can be automatedi RFD-D Horizontal discharge RFD Horizontal discharge FD Metal blades Horizontal discharge XARTO Design swirl diffuser for architectural 01/2016 US 3
Ceiling diffusers Product selection Product selection VDW TDV- SilentAIR RFD FD TDF- SilentAIR VDL XARTO Diffuser face style Circular Square Diffuser face Circular Square Galvanized sheet steel Aluminium Plastic Air control blades Fixed Adjustable Plastic, black and white Duct connection Horizontal Vertical FLEXTRO Attachments Damper blade Pressure tap Actuator Accessories Lip seal Protective cage Extended border Nominal sizes Circular diffuser face Square diffuser face Inlet* Technical data 300, 400, 500, 600, 625 300, 400, 300, 400, 500, 600, 625, 825 500, 600, 625 125, 160, 200, 250, 315, 400 300, 400, 500, 600, 625 300, 400, 500, 600, 625 315, 400, 630, 800 600 600, 625 Volume flow rate range [cfm] 15 996 23 667 8 699 19 498 21 625 138 2288 66 561 Volume flow rate range [l/s] 7 470 11 315 4 330 9 235 10 295 65 1080 31 265 Volume flow rate range [m³/h] 25 1692 40 1134 14 1188 31 846 36 1026 234 3888 110 954 Supply air to room air temperature difference 12 +10 K +15K 12 +10 K Possible Not possible *Nominal diameter 4 01/2016 US
Operational characteristics Swirl diffuser operational characteristics Although offered in various shapes and sizes, TROX Swirl diffusers all share a similar core design. A series of linear slots are aligned radially around the center of the diffuser face. These slots divide the supply air to the diffuser into a number of high velocity jets. This increase in supply jet surface area enables the diffuser to induce large quantities of room air. In most designs, the slots are subdivided along their length to further enhance the induction rate. The supply jets are also discharged in a cyclonic pattern, which forces the air jets to travel in a rotating manner around the diffuser center. During this travel, the jets induce additional room air and rapidly dissipate the velocity and temperature differentials between the jet and the ambient air, minimizing the distance at which high velocities and/or drafts exist. This high induction performance also enables them to perform equally well without an adjacent ceiling surface, making swirl diffusers an excellent choice for areas where exposed ductwork is employed. The unique discharge characteristics of swirl diffusers make them ideal for high air change applications involving air change rates up to forty (40) per hour. A section of this brochure is dedicated to such applications Swirl diffuser application guide APPLICATION FACILITY TYPE TDF TDV VDW RFD RFD-D FD VDL XARTO Offices, Schools, etc... (see p. ) Clean rooms, Labs Minimal velocity disturbance Animal Laboratories High sensible cooling loads Offices, Schools, etc... High ceiling heating/cooling Convention Halls, Gymnasiums Clean room application Labs, Hospitals, etc... Ideal solution for this application Frequently used for this application Rarely used for this application Suitable product not available 01/2016 US 5
Application - General application TDF and TDV Series TDF TDV TDF series features a fixed swirl discharge pattern. Suitable for surface mount or lay-in applications TDV series incorporates adjustable pattern control elements to allow field discharge pattern modification. Suitable for surface mount or lay-in applications Size 600 models are specifically designed to fit 2x2 lay-in ceiling modules. TDF and TDV models include a top entry (type V) plenum boxes (type H) are also available. Also available with integral HEPA filter Material: Galvanized steel Finish: White powder-coat paint VDW Series VDW VDW-R VDW series features an adjustable swirl discharge pattern. Suitable for surface mount or lay-in. Incorporates adjustable pattern control elements to allow field discharge pattern modification. Size 600 models are specifically designed to fit 2x2 lay-in ceiling modules Includes a top entry (type V) plenum box suitable for connection to round or flexible duct. Side-entry plenum boxes (type H) are also available. Also available with integral HEPA filter Material: Galvanized steel Finish: White powder-coat paint 6 01/2016 US
Application - General application FD Series FD FD-R FD series features a fixed swirl discharge pattern. Suitable for surface mount or lay-in. Size 600 models are specifically designed to fit 2x2 lay-in ceiling modules Includes a top entry (type V) plenum box suitable for connection to round or flexible duct. Side-entry plenum boxes (type H) are also available. Also available with integral HEPA filter Attractive design element for building owners and architects with demanding aesthetic requirements Material: Galvanized steel Finish: White powder-coat paint RFD Series RFD-R series diffusers is designed for surface mount or eposed duct application Model RFD-Q is designed for surface mount applications RFD models with type K entry can be direct connected to flexible duct All models are also available with (type H) side entry plenum (optional). RFD-Q RFD-R Material: Galvanized steel Finish: White powder-coat paint 01/2016 US 7
Application - General application RFD-..-D Series RFD-Q-D RFD-R RFD-.. -D series diffusers incorporate a bell mouth discharge for enhanced performance and aesthetics. Model RFD-R-D is designed for surface mount or exposed duct applications. Models with type K entry can be direct connected to flexible duct. RFD-R-D and RFD-Q-D models are also available with type H side entry plenums (optional). Model RFD-Q-D is designed for surface mount applications. RFD-EP-D models are designed for lay-in applications. Material: Galvanized steel Finish: White powder-coat paint VDL Series VDL-A VDL-B-V-L VDL models incorporate swirl performance on cooling While providing maximum vertical throw during heating. Designed for exposed duct applications. Optional electric operators allow remote reset or automatic control of diffuser discharge pattern, allowing horizontal discharge during cooling operation and vertical spot projection of heated air. Available with top or side entry plenum boxes. Material: Galvanized steel Finish: White powder-coat paint 8 01/2016 US
Application - General application XARTO Series Select designs shown - 10 styles available XARTO design diffusers are for more refined comfort zones with special demands on architecture and design Fixed air control blades High architectonic appeal HVAC and design Circular and square ceiling swirl diffusers for high volume flow rates at low sound power levels and low differential pressure For variable and constant volume flows Suitable for all types of ceiling systems Extended border suitable for freely suspended installation Swirl unit inside for the best swirl effect and high induction levels Plenum box with acoustically optimized and lockable damper blade Ideal for comfort zones Material: Galvanized steel and plastic Finish: Special colors upon request 01/2016 US 9
Selection Sizing with the help of this catalog This catalogue provides convenient quick sizing tables for ceiling diffusers. The tables give supply air volume flow rates for all nominal sizes. The maximum volume flow rates are for an open damper blade. A smaller opening of the damper blade results in higher sound power levels and a higher total differential pressure. The tables show values for damper blade positions 45 and 90. Sizing data for other volume flow rates and damper blade positions can be determined quickly and precisely using the Easy Product Finder design program. Sizing example Given data = 474 cfm Square ceiling diffuser, steel, with fixed air control blades Maximum NC 37 with damper blade position 0 Swirl diffuser for better air distribution Quick sizing Type TDF-SA Nominal sizes: 600 Selected: TDF-SA-Q-Z-H-M Easy Product Finder The Easy Product Finder allows you to size products using your project-specific data. You will find the Easy Product Finder on our website. 10 01/2016 US
Selection Room Wizard in EPF It is possible to create an edification schedule and define all rooms in the Easy Product Finder (EPF). The algorithms developed by TROX allow the designer to obtain quick answers for the best diffuser selection to achieve the comfort levels required by the customer Room wizard Step 1 - Room Room wizard Step 2 - Air flow definition Step 3 - Arrangement of diffusers Room wizard Results Room Wizard results show list of swirl diffuser options available which meet the room requirements. Based on this selection, the ideal solution is the US-made VDW series swirl diffuser. 01/2016 US 11
Air distribution systems Air distribution systems Development goals for swirl diffusers Rapid reduction of temperature differences Rapid reduction of the airflow velocities Low sound power level Airflow velocity The recommended airflow velocity in the occupied zone 200 fpm (0.2 m/s) Simulation of air discharge Velocity A rapid reduction of airflow velocities requires as many individual jets as possible. These jets should be stable and have a highly inducing effect. Simulation of airflow through blade Optimum air distribution from numerous CFD simulations Prototype (rapid prototyping) confirms results Importance of geometry Geometry Three-dimensional blade contours Various entry flow and discharge angles Purpose To prevent eddies To prevent return flows To prevent rough flow behavior at the edges 12 01/2016 US