Catalog Swirl diffuser DAL 358

Transcription

1 Catalog Swirl diffuser DAL 358

2 Concordia University, Montréal, Canada

3 DAL 358 model DAL DAL Method of operation DAL Flow and direction of the air DAL Range of application and Quick selection DAL Diagrams of performance DAL Dimensions and Weight DAL DAL DAL DAL content DAL 358 C

4 Cafeteria, CIMA+ ing., Sherbrooke, Québec

5 Swirl Diffuser Description, Areas of application and Benefits DAL 358 Swirl diffuser The DAL 358 is a high induction swirl airflow diffuser with a circular or square front plate. It has eccentric ABS cylinders and profiles controlling air stream. The DAL 358 permits optimal adaptation of the ventilation system to prevailing room requirements. Eccentric cylinders integrated into the front plate permit a variety of airstream configurations, even after installation. The DAL 358 technology provides high speed discharge air with relatively low sound power. The swirl airstream, the stability and the high induction generated from the very start of the discharge slot make the DAL 358 the diffuser of choice for high air flow rates and variable air volumes. Areas of application -High flow rate zones -Comfort zones -Offices with closed work spaces -Offices and clean rooms -Administrative centres -Computer(class-)rooms -Meeting rooms -Multi-purpose rooms -Systems with constant or variable airflow rates -Entrance halls (vertical air blast) Product benefits - Rapid reduction of speeds and temperature variations caused by high induction - Low sound power for high air flow rates - Stable swirl airflow and a variety of air blasts available in directions - Eccentric cylinders allowing 1800 air blast adjustment - Possibility of changing airflow, even after installation - Possibility of reducing total airflow rate as much as 25% in VAV - Three times as much induction as a conventional 4-way diffuser - Possibility of eliminating peripheral heating due to diffuser heating - Fewer diffusers required - Possibility of reducing total air volumes of the various units, while meeting requirements in air mix quantity - Possibility of adapting to systems requiring constant or variable airflow rates Subject to technical changes. Version 04 / 06 / DAL 358 1

6 Swirl Diffuser DAL 358 Configuration Whether on a square or circular front plate, the slots for the eccentric cylinders are generally arranged in a star pattern. DAL 358-Q-300/400 DAL 358-Q-300/603 DAL 358-R-300 The diffuser is mounted on a plenum. Up to a nominal size of 800, the front plate is secured by a concealed middle screw. In the case of the DN 60 however, a reinforcement crossbar is required to secure the plate. Only the DN 800 has a different fastening configuration; screws are fastened at the 4 corners of the plate DAL 358-Q-400/400 DAL 358-Q-400/603 DAL 358-R-400 DAL 358-Q-500/502 DAL 358-Q-500/603 DAL 358-R-500 DAL 358-Q-600/603 DAL 358-R-600 DAL 358-Q-800/800 DAL 358-R DAL 358 Subject to technical changes. Version 23 / 08 / 2012

7 Swirl Diffuser Method of operation The eccentric cylinders, 100 mm in length, can pivot a full In their initial position, (1A and F6), the airflow will deviate by 900 with a constant discharge blast. Turning the cylinders to positions 2 1 and 6 5, for example, will reduce the section without tapering off and the air blast will increase. Adjustments 2 1 and 6 5 are standard for North America because of the multiple VAV applications (variable air volume). The eccentric cylinder, aided by the profiles of the slots, creates a powerful channel into which the air is drawn. When nearing the exit of the cylinder, air depression takes place. Air Flow Behaviour The DAL 358 frontal plate has slots arranged in a characteristic star pattern. Turning the cylinders individually can produce a multitude of airstream patterns. In this manner, obstacles to efficient air flow can be avoided (lamp bases, ceiling drops, architectural columns, etc...). When installing in high ceilings (>5 m), a portion of the cylinders in the centre of the slot must be directed to produce a vertical blast (see figure 1). Use of the DAL 358 does not require a closed ceiling installation in order to produce a stable horizontal airflow. Despite the variety of air flow directions, all shapes have more or less the same sound power and pressure drop because of the specific design of the eccentric cylinder. Controlling the direction of airflow Air flow Indexing range min. max. Direction of airflow Cylinder position 1A Cylinder position 2 1 Cylinder position 4 3 Swirl air blast When positioning all the cylinders on 1 A, a rotating air blast under the ceiling is produced in a swirling stream, creating a strong induction current. (standard setting). One-Sided Blast This air flow is obtained by positioning all of the cylinders on 1 A. Two-Sided Blast This blast on two sides is obtained by positioning all cylinders of one half on 1A and those of the other half on F6. Cylinder position CD Schema 1 Subject to technical changes. Version 04 / 06 / DAL 358 3

8 CIMA+ ing., Sherbrooke, Québec

9 Swirl Diffuser Vmax = Vmax simulation X f Pt = Pt simulation X f LWA[dB] = LWA[dB] simulation X f Flow and Direction of the air DN helical flow ST = Standard helical flow (2 1) HL = Flow high-rise (>5m) (exterior 21 and center C D ) VF = Vertical flow (C D) DN 300 DN way helical 3W = Flow 180 (wall) ( ) DN 300 DN 400 DN 400 DN 500 DN 500 DN 600 Position 4 3 Position 2 1 DN 600 Correction factor : f V MAX 1.0 Pt 1.0 L WA [db] 1.0 DN 800 Correction factor : f V MAX 1.2 Pt 1.3 L WA [db] 1.1 DN 800 DN way 90 3C = Flow 90 (corner) (2 1) DN 300 DN way corner 2L = Flow on both side by L (2 corridors) (2 1) DN 300 DN 400 DN 400 DN 500 DN 500 DN 600 DN 600 Correction factor : f V MAX 1.4 Pt 1.0 L WA [db] 1.0 DN 800 Correction factor : f V MAX Pt L WA [db] DN 800 DN opposite ways DN way DN 300 2W = Flow on two opposite sides ( ) 1W = Flow on one side (2 1) DN 300 DN 400 DN 400 DN 500 DN 500 DN 600 DN 600 Correction factor : f V MAX 1.7 Pt 1.0 L WA [db] 1.0 DN 800 Correction factor : f V MAX Pt L WA [db] DN 800 Subject to technical changes. Version 08 / 05 / DAL 358 5

10 Range of application - Quick selection for DAL 358 Height of the room m 3 /h/m 2 cfm/sq ft Nominal size DN Quantity of m 3 /h cfm Min. distance (m) Min. distance wall (m) Critical X (m) Pressure P (Pa) Acoustic Power level Lw(dBA) DN m (8 ft) DN 500 DN DN DN m DN (10 ft) DN DN DN m (13 ft) DN 500 DN DN **Lw(dBA) : The absorption of the room is not considered. Column for any room from that height at the same volume of air by diffuser Column in reference to the example Specifications : - 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 : 1550 cfm 4 - Initial temperature difference: T = Air velocity : 1.8 m = 0.25 m/s (50 cfm) - VAV : 25% Using the data on ceiling height 1 and airflow rate by surface (m 2 or sq. ft. 2 ), 2 choose the nominal size (DN) of the DAL Divide the total airflow rate of the room 4 by the ideal value of the air flow rate for the selected size. Adjust the quantity of diffusers to achieve symmetry in the room while respecting the maximum airflow rate in the optimal setting range. 5 Watch for minimal distance between diffusers and between diffusers 6 and walls. 7 Location of the diffusers 1.8 m (6 ft) Y Airflow pattern comfort line Scale grid: 1 m Blue: Air velocity >= 0.25 [m/s] Connector diameter ød mm inches = minimum range of application = Optimal range of application = Maximal range of application DN 800 opt 540* DN 600 opt 360* DN 500 opt 240* DN 400 opt 130* DN 300 opt 65* * Ideal operating value in cfm cfm L/s m /h. Airflow V (m 3 /h) DAL 358 Subject to technical changes. Version 04 / 06 / 2012

11 Swirl Diffuser Stream rating diagram Notes : Room absorption is not factored in. For a comparison with North American values, reduce sound power by 10. Flow sub-ceiling Airflow V CFM [m /h] = L WA [db(a)] = L WA [db(a)] = L WA [db(a)] 1 3 L WA [db(a)] = L WA [db(a)] = Airflow distance after conjunction (y [m]) Ft 33 in./h 2 O Pressure loss Pt [Pa] m/s ft/min Airflow distance x [m] Airflow velocity v max DAL Subject to technical changes. Version 04 / 06 / DAL 358 7

12 Swirl Diffuser Airflow performance diagram and Example Critical airflow distance DN400 et DN300 Critical airflow distance x crit [m] Critical airflow distance x crit [m] 10 DAL DN 400 / 300 Airflow V Airflow V T Temperature difference (0) (100) (200) (300) (400) (500) Critical airflow distance x crit [m] [m /h] Airflow V T Temperature difference x crit [m] (DN300) Critical airflow distance x crit [m] [m /h] Airflow V DAL DN 500 [m /h] [m /h] T Temperature difference DAL DN 600 DAL DN 800 T Temperature difference Temperature ratio Specifications : Height of ceiling: H= 3.00 m Airflow rate by diffuser: V O = 600 m3/h Maximum cooling: T 0 = -10 Distance between diffusers: 2 x 1.7 = 3.4m Requirements: 1. Nominal size of diffuser 2. Sound power L WA 3. Pressure drop pt 4. Maximum air velocity at nominal head level (1.8 m) 5. Maximum temperature variation of ambient air at nominal head level 6. Critical path of airflow (blast detaching itself from ceiling when cooling) Solution: 1.From diagram" Range of Applications" we note the nominal size of DN , 3. From diagram "Airflow from Ceiling" for the DN 600 as diffuser and an airflow rate of 600 m3/h 2 we note the following values: Sound power: 39dB 3 (29 db when factoring in room absorption) Total pressure drop: 25 Pa 4 4. At nominal head level y = H = (3.00 m m = 1.20 m) and a horizontal airflow path of x-1.7 m 0.18 m/s 6 7 we note a maximum air velocity of 5. For an airflow distance of (x+y) = 1.70 m m = 2,90 m 8 and a DN 600, we note a temperature ratio of The maximum temperature variation reached between room air and air blast at head level is x 10 = From diagram "Critical Distance of Airflow" and an airflow rate of 600 m3/h with an initial temperature variation of T0 =-10 we come to a critical distance of airflow Xcrit = 1.7 m. 10 Txy T x bzw. x + y [m] DAL 358 Subject to technical changes. Version 13 / 08 / 2012

13 Laval University, Québec, Canada

14 TVA, Montréal, Canada

15 Swirl Diffuser Dimensions DAL358 Dimension / Weight Square plenum DAL358 Dimension / Weight Round plenum Size DN 300/ Size DN 300/ Cote A Cote B Cote C Cote ØD Cote E Cote F Poids [Kg] A eff [m 2 ] / Size ØA Size B Size C Size ØD Size E Size Ø F Weight [Kg] A eff [m 2 ] / with square plenum - lateral input Suspension hole, 4 x Ø6.3 with round plenum - lateral input Suspension bracket (3) Flow control (optional) ØD Flow control (optional) Perfored metal sheet Perfored metal sheet B E C 14 F A Ø F Ø A with square plenum - top input ØD with round plenum - top input Flow control (optional) Flow control (optional) Perfored metal sheet C Perfored metal sheet E ØD B E C 8 ØD C E F A 8 Ø F Ø A Subject to technical changes. Version 23 / 08 / DAL

16 Swirl Diffuser Correction factor of air flow for a reading with balometer DAL DN 300 Adjustment: Helical - adjustment Air flow - Balometer (cfm) Actual flow at diffuser (cfm) DAL DN 400 Adjustment: Helical - adjustment Air flow - Balometer (cfm) Actual flow at diffuser (cfm) To ensure adequate balancing of DAL 358 type diffusers, it is recommended to use the correction factors of the airflow rate equivalent to the resistance generated by the balometer. These factors are valid for a ventilation system comprising at least 3 diffusers after a VAV unit or box. For less than 3 diffusers with an automatic airflow rate setting, factors are lower than the stated ones. Such as indicated in the ALNOR manual, Appendix B - "Capture Hood Flow Resistance", the instrument's manufacturer recommends taking a reading at the ventilation duct and comparing it with one taken under the diffuser, with or without the balometer, in order to determine the correction factor. In order to avoid this procedure, we provide herein the correction factors needed for all DAL 358 diffuser models. Balometer (cfm) Factor Actual flow (cfm) DAL DN 500 Adjustment: Helical - adjustment Actual flow at diffuser (cfm) Air flow - Balometer (cfm) Balometer (cfm) Factor Actual flow (cfm) DAL DN 800 Adjustment: Helical - adjustment Air flow - Balometer (cfm) Balometer (cfm) Factor Actual flow (cfm) Actual flow at diffuser (cfm) Balometer (cfm) Factor Actual flow (cfm) DAL DN 600 Adjustment: Helical - adjustment 21 Actual flow at diffuser (cfm) Air flow - Balometer (cfm) Balometer (cfm) Factor Actual flow (cfm) Identification Chart Y X DN X (mm) Y(mm) DAL 358 Subject to technical changes. Version 04 / 06 / 2012

17 1 - Description and Physical Characteristics steel. Integrated slots in the frontal plate (circular or square) hold eccentric cylinders ensuring a high induc- 1.2 The eccentric cylinders, 100 mm in length, are individually adjustable by rotating as much as 360, each one on its own axis, inside the front plate. This design allows for a multitude of adjustments covering the range of air 360 ). 3 - Connection manufacturer. The plenum is made of 24-gauge galvanized steel and comprises a perforated stabilizing suspension points in accordance with paraseismic standards are provided. The input brace is centered on the side or on the top of the plenum, and its size is made The joints of the plenum are sealed with silicone caulking free of VOC emissions. ceiling or classic gypsum ceilings. (DAL 358 R and DAL 358 Q) 1.4 Every plate is coated inside and outside with a baked polyester TGIC-enamel paint, providing a smooth, colour from the RAL colour chart or among special-order colours. 1.5 Eccentric cylinders are available in black or white. 4 - Balancing 4.1 Balancing of the DAL 358 diffusers must be executed by a technician trained in ventilation system balancing with a professional certificate. 4.2 The technician must take into consideration the correction factor for use of a balometer when regulating air volume. 5 - Quality required: NAD Klima, model DAL Performance even in situations requiring variable air volume -- in order the room ( TXY = TR - TXY) and the initial temperature variation ( TO = TR - TO). This ratio must perform a minimum of TXY TO tion software. This software indicates the pressure drop and sound power generated as well as a cross-sectional isothermal and heating modes. Upon demand from the engineer, the software can demonstrate a nominal velocity in an occupied zone of 0.25 m/s and can adapt to various requirements of air volume (25% to 100% of mode. Subject to technical changes. Version 04 / 06 / DAL

18 DAL 358 Product Q = Square R = Round 300, 400, 500, 600, , 502, 603, 800 Nominal size (603 for 24''X24'' T-bar) Outer size HL = Flow high-rise (>5m) (exterior 21 and center CD) VF = 1W = Flow on one side (2 1) 2W = Flow on two opposite sides ( ) 2L = Flow on both side by L (2 corridors) (2 1) 3C = Flow 90 (corner) (2 1) 3W = Flow 180 (wall) ( ) W = White roll and receptacle (RAL 9003) C = Cream roll and receptacle (RAL 9010) B = Black roll and receptacle X = Without roll 9003 = White 9010 = Cream = RAL colour * (write the number of RAL colour) S = Plenum with lateral input T = Plenum with top input X = Without plenum X = Without insulation I = With acoustic insulation F = et X = Without damper D = With damper (for gypsum ceiling) Color of roll and receptacle Colour ( front plate) Plenum Insulation Damper DAL358 - Q ST - W S - X - X Example Notes : Blue : Standard, in stock Write the number of 4 digits of the RAL color chart Our powder paint colors are available in the RAL color chart only DAL 358 Subject to technical changes. Version 23 / 08 / 2012

19 Concordia University, Montréal, Canada

20 NAD Klima 144, Léger Street, Sherbrooke (Québec), Canada J1L 1L9 T : F : info@nadklima.com