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DAL 358 diffuser - 22 Pages

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Catalogue excerpts

Concordia University, Montréal, Canada

 Open the catalogue to page 2

Swirl diffuser DAL 358 model Description, areas of application and benefits . . . . . . . . . . . . . . . . . . . . Range of application and quick selection . . . . . . . . . . . . . . . . . . . . . . . . The distance (radius) in a view plan, to validate a maximum air speed of 0.15 m/s (30 fpm) at 1.3 m above the ground . . . . . . . . . . . . . . . . . Example of an application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Performance diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Critical distance of airflow in cooling...

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Cafeteria, CIMA+ ing. , Sherbrooke, Québec

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Swirl Diffuser Description, areas of application and benefits The DAL 358 swirl diffuser is made of steel. The receptacle and the eccentric rollers are integrated to the front plate (square or round). Each diffuser is supplied with a stabilising chamber, allowing for a uniform and silent airflow. The DAL 358 permits optimal configuration of the ventilation system to meet the ventilation requirements of a room. The eccentric rollers allow for a variety of airstream configurations, even after the unit has been installed. The DAL 358’s technology provides high speed air discharge with low acoustic...

 Open the catalogue to page 5

Swirl Diffuser Both the square and circular front plates have slots for the eccentric rollers arranged in a star pattern. DAL 358-Q-300/400 The diffuser is mounted on a plenum. The front plate is secured by a hidden center screw. For the nominal dimension 800, 4 additional screws in the corners of the plate to secure the frontal plate. The diffuser will be powder coated with a polyester TGIC-free paint, providing a smooth, easy-to-clean, chip and fade resistant finish. The colours are available from the RAL colour chart. Subject to technical changes. Version 01 / 01 / 2016

 Open the catalogue to page 6

Swirl Diffuser The 100 mm long UL 94 certified eccentric rollers can be rotated 360 degrees. In standard position (2 1), the eccentric rollers establish, through the profile of the slots, a streamline through which the air is carried along. At the outlet of the roller, a low pressure is created generating a high rate of induction. Controlling the direction of airflow Indexing range Helical (swirl) air stream When positioning all the rollers on 2 1, a rotating air stream is produced below the ceiling in a helical stream, creating a strong induction current. (Standard setting). One-sided air stream...

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Swirl Diffuser Airflow and direction of air VMAX = VMAX simulation X f ∆Pt = ∆Pt simulation X f LWA [dB] = LWA [dB] simulation X f DN 600 360° swirl airflow ST = Standard swirl airflow (21) HL = Flow rise (>5m) (exterior 21 and center CD ) VF = Vertical airflow (CD) DN 600 2 airflow direction at 90˚ 2C = Airflow 90° (corner) (21) DN 600 2 directions in the corner 2L = Airflow in two directions in an L shape (2 streams) (21) DN 600 2 opposing directions 2W =Airflow on two opposing directions (21 - 56) DN 600 1 direction 1W =Airflow on one side (21) Subject to technical changes. Vers

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Swirl Diffuser Range of applications and quick selection Min. distance Min. distance diffusers [2x] wall (m) (m) Acoustic Power level Lw(dBA) **Lw(dBA) : The absorption of the room is not considered. Column for any room from that height at the same volume of air per diffuser (isothermal values) Column in reference to the example Specifications : Location of the diffusers - Room: L x W x H = 10 m x 10 m x 2.44m ( 33 ft x 33 ft x 8 ft) - Total air flow in the room : 1400 cfm 4 - Initial temperature difference: ∆T = -10°C - Air velocity : 0.15 m/s (30 ft/m) 1.3 m (4.25 ft) from the floor - VAV :...

 Open the catalogue to page 9

swirl diffuser The distance (radius) in a view plan, to validate a maximum air speed of 0.15 m/s (30 fpm) at 1.3 m above the ground : X L - (y=h-1.3) V 0.15 In several cases, the air flow is felt at the height of 1.3 meters to over 0.15 m / s (30 fpm) for sitting (sedentary) person. German manufacturers of air diffusers also recommended a maximum air 0.15 m / sec (30 fpm) for a seated person, and 0.2 m / s (40 fpm) at the height of 1.8 meters for a standing person. 3. Limit the initial temperature difference of ± 27 ° F (15 ° C) or 37 ° C. 4. Set the heating mode VAV box to the specified maximum...

 Open the catalogue to page 10

Swirl Diffuser Illustration of circles and example of an application Example of application : DN 300 - Application: Office L/S CFM - Room height: 2.74 m (9 ') 30 14 - Diffuser Airflow: 280 fpm 40 19 - Operative Temperature: 22.5°C (72.5°F) 50 24 - Height of comfort level = 1.3 m (± 4 ') - Air Velocity to the comfort level: 60 28 0.15 m / s (30 fpm) 70 33 38 From the data of the ceiling height 1 90 42 and the diffuser air flow 2 , select the nominal size of the diffuser DAL 358 (according to the quick selection table) 3 DN 400 and choose the recommended distance between two diffusers in order to...

 Open the catalogue to page 11

Swirl Diffuser Performance diagrams Important Acoustic absorption of the room is not accounted for. For a comparison with north american values, reduce the acoustic power by ten (10) dB. Flow sub-ceiling The values are based on an isothermal flow. = L WA [dB(A)] Airflow distance after conjunction (y) Subject to technical changes. Version 01 / 01 / 2016

 Open the catalogue to page 12

Swirl Diffuser Critical distance of airflow in cooling and temperature ratio m pi. Research: 1. Nominal size of diffuser 2. Acoustic power LWA 3. Pressure drop ∆pt 4. Maximum air velocity at nominal head height (1.8 m) 5. Maximum temperature variation of ambient air at nominal head height 6. Critical path of airflow (stream detaching itself from ceiling when cooling) Solution: 1. From the "Range of Applications" diagram we note the nominal size of DN600 1 Critical airflow distance xcrit 2. 3. From the "Airflow from Ceiling" diagram with the DN 600 diffuser and an airflow rate of 600 m3/h 2 we...

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Laval University, Québec, Canada

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Swirl Diffuser Dimension / weight Size DN Square plenum Dimension / weight Round plenum square plenum - side inlet round plenum - side inlet Hanging braces ( 3 ) Perforated metal sheet Perforated metal sheet Axial damper round plenum - top inlet square plenum - top inlet ØD Radial damper Radial damper Perforated metal sheet Perforated metal sheet Subject to technical changes. Version 01

 Open the catalogue to page 16

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