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FDD diffuser - 20 Pages

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Catalogue excerpts

Flexible diffuser FDD model Description, areas of application and benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mode of operation General operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heating from the ceiling (control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Heat recovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

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Flexible diffuser Description, areas of application and benefits Benefits - High induction diffuser which allows homogeny of the air in a room: temperature, humidity and air density. - Increased comfort in the occupied zone • Comfortable movement of air • Low temperature variances • Low noise The FDD is a high induction air diffuser fabricated of fully waterproof permeated polyester PVC (Polyvinyl Chloride). This diffuser is made to address the ventilation needs of spaces with very large volumes of air. The precise perforations of the FDD are created by laser according to the data provided by...

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Gymnasium, Lévis, Canada Subject to technical changes. Version 01 / 01 / 2016

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Flexible diffuser Composition The FDD diffuser is a flexible circular diffuser with perforations. Each sections can reach up to 15 metres (50 ft.) in length. The FDD diffuser is available in any diameter from 200 mm (8 in.) to 1473 mm (58 in.). A PVC extrusion is integrated into the diffuser to allow its suspension. At each of the ends, a metal collar or a zipper is used to join sections of the FDD diffuser together. Accessories The elbows, reducers and end cap are available in polyvinyl. All of the standard accessories (elbows, sleeves, reducers, multi-branch connectors, etc.) are available in...

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Flexible diffuser General operation General operation Representation of the induction effect generated by the FDD The FDD diffuser is made to surpass the technical limits of traditional air diffusion systems. Its function is based on the principal of high induction diffusion. The perforations of differing diameters and their positioning on the FDD promote the displacement of a large quantity of ambient air (see the illustration below). The thermal exchange between the blown air and the ambient air occurs close to the FDD and the temperatures rapidly near isothermal levels. The risk of stratification...

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The particularity of the FDD allows the diffusion of air to be configured to the room. In effect, for areas with elevated heights [ H > 6 m (20 ft)], the FDD is perforated to diffuse the air downwards for both heating and cooling modes. For rooms with lower ceilings ( H < 5 meters), the air is pushed upwards through the FDD (see figure B). For the cooling mode, the multitude of perforations with differing diameters allow the air to be pushed upwards to mix with the hot air of the space which often accumulates at ceiling height. In the case of heating mode, the air is directed downwards to combat...

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Flexible diffuser General operation Heating from the ceiling (control) When the diffuser is installed at 4.6m (15 ft) and higher and the air flow is being used for heating, it must be controlled with two temperature sensors. T The first sensor is installed at 1.5m (5’) from the ground and the second at the ceiling. The average temperature reading between the two (2) sensors allow the system to start and stop in heating. This will provide the quickest response to heating needs when there is a large variation in temperature. This phenomenon is produced for example when there is a change from night...

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Flexible diffuser General operation Heat recovering Representation of internal heat recovery by the FDD All spaces, regardless of its use, require proper ventilation compliant to establish norms. This aeration is only possible if the ventilation system in place is efficient. Supplying a room with outside air in winter without heating is dependent on external temperatures and the internal heat generated by heat sources (heat generated by machines, lighting and by the employees etc.) is possible with the high induction diffuser FDD. In this type of situation in a space where internal heat sources...

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Flexible diffuser General operation Design guide Progressive method of operation: We recommend a rigid straight section the length of which is three (3) times the diameter before the coupling of the FDD diffuser. When the driver is square with a square to round transition, 1.5 times the diameter in length is necessary before the rigid section. This assures an optimal level of air stability at the diffuser inlet. The majority of FDD diffusers are sensitive to vibrations and the jolt effect provoked by a sudden start of the ventilation unit. The air balancing key must be located before the straight...

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Flexible diffuser Recommended spacing between FDD X MAXIMUM m (ft) RRA recommended Selecting the diameter for a flow less than 1400 cfm Selection of the diameter of the FDD diffuser should be made using the parameters on the following table. Ø recommended For higher flow to 1400 cfm, select a diffuser diameter (see diameters in the codification on page 15) For a diffuser longer than 15 meters (50 ft), a reducer must be installed at the center (see bottom) . spiral duct Aerodynamic balancing and reducer placement To optimize the uniform airflow in the FDD diffuser, the total length must not exceed...

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Flexible Diffuser Pressure Loss ΔP Loss of pressure by diameter of the duct Static pressure at the entrance of FDD Pa (’’ water) ΔPL* Loss of pressure in the reducer ΔP * Loss of pressure in the elbows L - What are the total losses of pressure ∆Pt ? * ΔP Pressure drop equivalent length Correction factor for different air velocity in duct : ΔP = F x ΔP (v=1000ppm) Speed of air in the duct ΔP Loss of pressure by diameter of the duct ΔP Loss of pressure in the elbow Data : - Total air flow : 2500 cfm - Height of installation : 25 feet - Air speed in the duct : 1000 ppm The loss of pressure in a circuit...

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