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RRA diffuser - 26 Pages

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Catalogue excerpts

Boréalis, Magog, Canada

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Duct Diffuser RRA model Description, areas of application and benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Operation and direction of airflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Range of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Selecting the number of slots with eccentric rollers . . . . . . . . . . . . . . . . . . . . . . . 5 Selecting...

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2020, University, Montreal, Québec

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Duct Diffuser Description, areas of application and benefits The RRA is a high induction diffuser made to address the ventilation needs of spaces with low and medium heights. The RRA diffuser is made of galvanneal steel covered with powder coated paint. The standard manufacture size is 1500mm (5 ft) long. Alternatively, it is available indifferent lengths to meet your needs It is ideal for applications where the technology must be not only efficient but also integrated into the architectural design. Integrated eccentric rollers and/or nozzle rollers, the circular RRA diffuser offers a multitude...

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Duct Diffuser Composition The RRA in-duct diffuser is a smooth circular pipe on which the slots are mounted in the direction of the length. The number of slots is determined by the quantity of air flow and by the diameter of the duct. The slots contain 100 mm long UL94 certified ABS eccentric rollers or ABS nozzle rollers (black, cream or white). The eccentric rollers are provided with alphanumeric guides which allow adjustment of the airflow pattern across a 180°range. The RRA diffuser is constructed in diameters from 200mm up to 1419mm. Metallic reinforcements are installed on the interior of...

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Duct Diffuser Operation and direction of airflow Eccentric roller RRA with eccentric rollers RRA with eccentric rollers Figure E Eccentric roller Adjustment code Nozzle roller DRB (With roller nozzle) 1.8 m (6 ft) RRA with roller nozzles BC-DE Diffuse DFH DRB (With roller nozzle) The length of the rollers is adjustable up to 100mm. As a result, the combinations of airflow are almost infinite. In manufacturing, the ducts are individually adjusted for each project. The standard setting for the rollers is set to diffusion mode in the positions “21” and “65” alternately. This setting produces strong...

 Open the catalogue to page 7

Duct Diffuser Maximum installation space Installation height of of the RRA H Recommended sspace between RRA X MAXIMUM Air flow by meter of slot of . RRA Vo m3/h/m (cfm/li. ft) Cooling only: keep the maximum distance X depending on the height, but keep the airflow by meter of the slot at 50 – 120m3/h/m. Aerodynamic balancing and reducer placement To optimize a uniform airflow in the RRA diffuser, the total length must not exceed 7.5 meters (25 ft) without using a reducer or a balancing damper. For a diffuser greater than 7.5 meters (25 ft), a reducer must be installed at the center (see 1) or to...

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Duct Diffuser Selecting the number of slots RRA with eccentric rollers 1000 (179) ( ) Research: 1- Airflow per meter of slot section 2- Number of slots n Solution: 1-The length of RRA slot is determined by the following : LS = LR - 200 mm = 1300 mm We find the airflow by meter of slot section: . . Vo [m3/h RRA] X F = Vo[m3/h/m] 420 [m3/h] X 0.77 = 323 [m3/h/m] 1 Using the diagram “Selecting the number of slots”, for a height of 4m and with a heating application, we find the number of slots: n=3 2 Duct diameter Subject to technical changes. Version 01 / 01 / 2016 Air Flow by meter of slot of RRA...

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Duct Diffuser Selecting the number of slots RRA with roller nozzles 3000 ( 538 ) 2800 ( 502) Specifications: Height at the bottom of the duct: H = 5 m . Airflow by diffuser: Vo = 1040 m3/h Heating: ∆T = +10°C Length of the RRA: LR = 1500 mm Research: 1- Airflow per metre of slot section 2- Number of slots n Important : To facilitate the selection of the RRA, the total airflow should be calculated for lengths of the active vents of 1m. Solution: The length of the slots of the RRA is determined by the following: LS = LR - 200 mm = 1300 mm The airflow s calculated by number of slot section metres...

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Duct Diffuser Air flow velocity diagrams RRA with eccentric rollers For installation height 3 m (10 ft.) à 4.3 m (14 ft) Airstream pattern (roller position) V max= k1 x Vmax diagram Subject to technical changes. Version 01 / 01 / 2016 Vertical penetration depth ymax [m] ft. m3/h/m slot cfm/li. ft/ slot 7 ˙ Volume flow V0 Path after impact y[m] pi. 8.2 7,26.6 2,2 Divergence (half left 2 1 half right 6 5)

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NAD Klima Duct Diffuser Vertical deflection RRA with eccentric rollers Additionnal airflow deviation Ay as a result of the airflow discharge angle a Subject to technical changes. Version 01/01 /2016

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Duct Diffuser Airflow speed RRA with nozzle roller For installation height 4.3 m (14 ft.) to 9 m (30 ft.) m3/h/m slot 170 30 cfm/li. ft/ slot Air flow V ˙ Vertical penetration in cooling ymax Vertical penetration in heating RRA with nozzle roller Subject to technical changes. Version 01 / 01 / 2016

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Duct Diffuser Acoustic power with eccentric rollers - Total airflow: - Number of RRA sections: - Number of slots per RRA: - Length of the RRA: - Length of the slot: 1. Air flow by meter of slot ? 2. Critical air flow distance X ? 3. Vertical penetration in heating Y max ? 4. Acoustic power generated L WA ? ro Acoustic power level L WA [dB(A)] 1. From total air flow, the number of section of RRA and the slots, we find : (2080 m3 /h ÷ 4 RRA) ÷ 3 slots = 173 m3/h by slot For a 1300 mm slot lenght, we calculate the air flow by meter of slot 173 m3 /h X 0.77 = 133 m3 /h/m slot 1 2. From diagram of...

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Duct Diffuser Eccentric rollers Nozzle rollers ΔP Loss of pressure over all rollers (1A/F6) Pa ( " water ) Air flow for slot length of 1 meter ΔP Pressure drop by diameter of regular duct ΔP * Pressure loss by diameter in elbows *ΔPL Equivalence in lenght of pressure loss Correction factor for different air velocity in duct : ΔP = F x ΔP (v=1000 fpm) Air velocity in duct ΔP Pressure drop by diameter in straight duct ΔP Pressure drop in elbows for different adjustments of rollers : ΔP = F x ΔP (standard adjustment) ΔP Pressure drop in reducer Subject to technical changes. Version 01 / 01 / 2016

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