for Pleasant & Healthy Air-Distribution ISO 9001:2000 Linear Slot Diffusers Product Bulletin 133-D

Transcription

1 for Pleasant & Healthy Air-Distribution ISO 9001:2000 Product Bulletin 133-D Linear Slot Diffusers

2 Pleasant.. Serene.. YOU & DASCO... Since 1964 Partners for good health

3 INTRODUCTION Linear slot diffusers are always considered as the most attractive air distribution devices. They are specially designed for ceiling mounting in a wide range of applications in heating, ventilation and air conditionin systems. At a perfect setting, linear slot diffusers provide a stable pattern of diffusion to produce an optimum performance for both supply and return air in addition to their pleasant appearance. To satisfy both architectural and engineering needs, curved slot diffusers have been also developed and designed. Whether it requires a continuous linear run, ellipse, complete circle orserpentine curve,. LINEAR/CURVED SLOT DIFFUSERS CAN ALWAYS BE IORPORATED INTO ANY DESIGN. 1 Introduction

4 LINEAR SLOT DIFFUSERS GENERAL Dasco linear slot diffusers for both supply and return applications DLD-C(S/R) are designed to give unobstrusive continuous air diffusion with a pleasing aesthetic appearance. Hairline joints ensure clean continuous runs of linear slot diffusers for both active and dummy sections. They are normally connected to the main ducting system by means of connection boxes (Plenums), and are adjustable in height for accurate lining-up with the ceiling. Linear Slot Diffuser ( 3 Slots) Linear Slot Diffuser ( 2 Slots) In general, DLD-C(S/R) linear slot diffuser is considered as a unique type of an air distribution device, dispenses proper air quantities, controls air pattern for ultimate human comfort and adapts to any design concept perceived by architect / design engineer. Mitered Corner ( 90º ) 2 Linear Slot Diffusers

5 DESCRIPTION Dasco linear slot diffusers DLD-C(S/R) are designed to give a comprehensive and full range of air flow patterns and volumes. Their deflector blades and volume control dampers give a full flexibility in air patternand volume control. These are fully adjustable from the face of the diffuser. Single or multiple slot arrangements can provide any combinations of horizontal, vertical or any intermediate setting of air flow pattern over a full range of 180º adjustment, as each slot is individually adjustable. Volume control dampers consist of two strips of extruded aluminium profiles, one fixed and one movable. They can be also usedas equalizing grids. Mitered Corners (Different angles) SINGLE SLOT ADJUSTMENTS Horizontal right Horizontal left Fully Vertical Dampered Horizontal Fully Closed MULTIPLE SLOT ADJUSTMENTS (TWO TO EIGHT SLOTS ) Horizontal one-way Horizontal two-way Fully Vertical Horizontal two-way Dampered(unequal flow) Vertical Horizontal 3 Linear Slot Diffusers

6 Two types of linear slot diffusers are available: Linear slot diffusers with 3 / 4 slot width. Linear slot diffusers with 1 slot width. Both are manufactured in one up to eight slots with a maximum one piece length of 6 meters as a standard, permitting complete control of flow rate without disturbing the selected air pattern. Linear slot diffusers with other lengths and /or number of slots can also be provided on request. End caps on both sides are supplied on one piece linear slot diffusers, and on one side of end sections of continuous units. Sections are connected by using alignment strips. MATERIAL & FINISH High quality and heavy gauge extruded aluminium profiles. They are available in white polyester powder coated finish. However, any other RAL standard colours are also available upon customer s request. Deflector blades and dampers are also made from extruded aluminium profiles normally in black colour. Plenum boxes are made from galvanized steel. LINEAR DIFFUSER (3-SLOTS) WITH DAMPERS 4 Linear Slot Diffusers

7 Linear Slot Diffuser (Hexagonal Shape) Linear Slot Diffuser (T-Shape) Linear Slot Diffusers (2Slots) Special Geometric Shapes Vertical outside Mitered corner section 2 Slots Diffuser Circular Shape Vertical inside Mitered corner section Vertical inside Mitered corner section Chamfered type 5 Linear Slot Diffusers

8 ACCESSORIES A complete variety of accessories and options are always available for DLD-C(S/R) 1. MOUNTING BRACKETS Are used normally for ceiling installations. They are made from Z-27(gauge 20 ) galvanized steel and are arranged with holes for easy installations. Mounting Brackets 2. ALIGNMENT STRIPS Are used for continuous sections and are made from aluminium sheets. Alignment strips 3. END CAPS L-Shape flanges, manufactured from aluminium extruded profiles and are available in different lengths to match different number of slots and widths. They are usually fixed at the end of linear slot diffusers and are very easy to install and remove. Alignment strips End caps Without end caps End cap (left or right) End caps (both sides) 6 Accessories

9 4. DUMMY SECTIONS With exactly the same construction of supply air linear slot diffusers but with blank off damper sheets. Are used along with continuation sections of supply and /or return linear slot diffusers for decoration purposes. Linear Diffuser (3 Slots) - Dummy Type 5. MITERED CORNERS Are usually used when slot diffusers are designed to form closed loops. They are available in one to eight slots and can have any combination of L1, L2 and angle ø. Mitered Corners 7 Accessories

10 PLENUM BOXES DESCRIPTION It is designed to ensure even air distribution along the associated linear slot diffusers, and therefore maintaining correct performance characteristics. Plenum boxes, are available with or without internal lining of thermal and acoustic insulation and are available for single or continuous installations. All joints are sealed for a perfect tightness and in most cases are Lock formed, which adds to maintain rigidity. INSULATION Fiberglass 25 mm thick (16kg/m3) with black tissue face for acoustic and thermal insulation (Available as optional) Plenum Box with insulation MATERIAL Galvanized sheet steel Z-27 (Gauge 24 ) Plenum Box without insulation 8 Plenum Boxes

11 SIZES Available in various neck openings (5 to12 ) suitable for fixing linear slot diffusers (1 to 8 slots). Maximum plenum length is 240 cm per piece. Longer lengths are provided with special joints to fit continuous shape. Insulated Plenum Plenum without Insulation Single Installation DLD-C with Plenum box DPB-C Table 1. Dimensions of plenum boxes ( with /without ) insulation 9 Plenum Boxes

12 ORDERING CODE Dasco Linear Slot Diffuser a =Version b =Number of slots c =Slot width d =Length,cm e =Number of end caps Dasco Plenum Box S :Supply R :Return RD :Return with volume control damper D :Dummy 1,2,3,4,5,6,7,8 1 :3/4 slot width 2 :1 slot width (Maximum 600) 0 : Without 1 : One end cap 2 : Two end caps DLD-C a - b - c - d - e DPB-C a - b - c - d - e a =Installation b =Number of slots c = Slot width d =Length, cm e =Thermal insulation S I :Single Unit :In - Line 1,2,3,4,5,6,7,8 1 : 3 / 4 slot width 2 :1 slot width (Maximum 240) 0 : Without thermal insulation 1 : With thermal insulation 10 Ordering Code

13 DIMENSIONAL DATA Linear slot diffuser with 3 / 4 slot width Linear slot diffuser with 1 slot width 11 Dimensional Data

14 DIMENSIONS OF LISTED SIZES: a) Linear slot diffusers with 3/4 slot width Table 2. Dimensions of linear slot diffusers with 3/4 slot width a) Linear slot diffusers with 1 slot width Table 3. Dimensions of linear slot diffusers with 1 slot width Woodall Colour Curved Diffusers Arched Shape 12 Dimensional Data

15 ENGINEERING DATA DEFINITIONS Throw (T) : Throw of an outlet, in m (feet), is the distance from the center of the outlet to a point in the mixed air stream where the highest sustained velocity of the mixed air stream has been reduced to a specified level, i. e, 100 and 50 FPM. CFM : Is the air flow rate in cubic feet per minute. Velocity (Vk) : Discharge or intake velocity of an outlet or inlet, in m/s (FPM) measured with an approved calibrated velometer at specified locations relative to the face of the outlet or inlet. Sometimes referred to as jet velocity. Terminal velocity (Vt) : Terminal velocity from an outlet, in m/s (FPM), is the highest sustained velocity in the mixed air stream arbitrarily specified and used to determine throw. Area factor (Ak) : Is the area factor of an outlet or inlet which is also a flow factor determined from the discharge or intake velocity ( V k ), and the volume flow rate (CFM). A CFM k = V k Static Pressure (Ps) : The outward force within a duct measured in mm (inch) W.G. Velocity pressure (Pd) : The forward moving force of an air stream within a duct measured in (Dynamic pressure) mm ( inch) W.G. Total pressure (Pt) : The sum of the velocity pressure and static pressure measured in mm (inch) W.G. The following table could be helpful before starting the selection of a linear slot diffuser. Table 4. CFM range for supply linear slot diffusers (1 to 8 slots). 13 Engineering Data

16 NOISE CRITERIA Noise criteria : The sound pressure level of 8 octave bands acceptable to human ears and are estimated from table 5. The sound caused by an air outlet is directly proportional to the velocity of the air passing through it. Ambient sounds a) b) c) ENVIRONMENTAL SOUND Existing within the space with air conditioning Equipment off EXTERNAL SOUND Entering a space from outdoors. INTRUDING SOUND Entering from adjacent spaces. Prior to selection of level from table 5, the three ambient sounds above must be considered. The room effect : Is the difference between the sound power level of a terminal and the sound pressure level sensed by human ears in the room, and is affected by room size, sound absorption characteristic of the room surfaces, ceiling height, space volume, distance of listener to terminal, terminal location and number of terminals. Curved Slot Diffuser Concave Shape Curved Slot Diffusers Convex Shape 14 Noise Criteria

17 RECOMMENDED NOISE CRITERIA FOR ROOMS Table 5. Recommended range of noise criteria from ASHRAE GUIDE. 15 Noise Criteria

18 BASIC PERFORMAE DATA FOR DLD-CS A. Supply linear slot diffusers with 3/4 slot width Note Number of slots Throw (Ft) <20 <20 < 20 <20 <20 <20 < 20 < Throw (Ft) <20 <20 < Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Table 6. Performance data for supply linear slot diffusers with 3 / 4 Slot width Throw data (Ft) is based on terminal velocities of 100 & 50 FPM for horizontal discharge. values are for horizontal discharge. For vertical discharge subtract(5) from values. values are for 4 Ft long unit and assume room attenuation 10 db Performance Data

19 Number of Slots Supply P.D. W.G Curve 1. Static pressure drop Vs. Air flow for DLD-CS ( 3 / 4 Slot width) Note Static pressure drop in inch W.G. for horizontal discharge. For vertical discharge multiply by 0.6 EFFECTIVE FREE AREA (A k ) Table 7. Effective free area A k (Ft 2 /Ft run) for DLC-CS ( 3 / 4 Slot width) 17 Performance Data

20 BASIC PERFORMAE DATA FOR DLD-CS B. Supply linear slot diffusers with 1 slot width Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Throw (Ft) Number of slots <20 <20 < 20 <20 <20 <20 < < 20 < 20 < 20 < < < Note Table 8. Performance data for supply linear slot diffusers with 1 slot width Throw data (Ft) is based on terminal velocities of 100 & 50 FPM for horizontal discharge. values are for horizontal discharge. For vertical discharge subtract(5) from values. values are for 4 Ft long unit and assume room attenuation 10 db. 18 Performance Data

21 Supply P.D. W.G. Number of Slots Curve 2. Static pressure drop Vs. Air flow for DLD-CS ( 1 slot width) Note Static pressure drop in inch W.G. for horizontal discharge. For vertical discharge multiply by 0.6 EFFECTIVE FREE AREA (A k ) Table 9. Effective free area A k (Ft 2 /Ft run) for DLC-CS (1 Slot width) 19 Performance Data

22 BASIC PERFORMAE DATA FOR DLD-CR A. Return linear slot diffusers with 3/4 slot width Static Pressure Drop W.G Number of slots < 20 < 20 <20 <20 < 20 < 20 < 20 < <20 < Table 10. Performance data for return linear slot diffusers with 3 / 4 slot width Note Performance data are for return linear slot diffusers with deflection blades. values are for 4 Ft long unit and assume room attenuation 10 db. Static pressure values are in inches W.G. EFFECTIVE FREE AREA (A k ) 8 Table 11. Effective free area A k (Ft 2 /Ft run) for DLC-CR ( 3 / 4 Slot width) 20 Performance Data

23 BASIC PERFORMAE DATA FOR DLD-CR B. Return linear slot diffusers with 1 slot width Static Pressure Drop W.G Number of slots < 20 < 20 < 20 <20 < 20 < 20 < <20 <20 < < Table 12. Performance data for return linear slot diffusers with 1 slot width Note Performance data are for return linear slot diffusers with deflection blades. values are for 4 Ft long unit and assume room attenuation 10 db. Static pressure values are in inches W.G. EFFECTIVE FREE AREA (A k ) Table 13. Effective free area A k (Ft 2 /Ft run) for DLC-CR (1 slot width) 21 Performance Data

24 CORRECTION FACTORS A) Supply Linear slot diffusers Throw and values in performance tables are based on supply linear slot diffusers with active length of 4 Ft. To determine throw and values for other lengths, use the correction factors in the following table : Table 14. Correction factors for throw and values at different active lengths of supply linear slot diffusers Static pressure drop and values in performance table/curves are based on 100% damper opening. Use the following correction factors for different damper adjustments. Table 15. Correction factors for static pressure drop and values at different damper adjustments B) Return linear slot diffusers values in performance tables are based on return linear slot diffusers with active length of 4 Ft. To determine values for other lengths, use the correction factors in the following table: Table 16. Correction factors for values at different active lengths of return linear slot diffusers. 22 Correction Factors

25 AIR BALAING ADJUSTMENT To determine the CFM, follow up the following procedure: 1) Use measuring tools for air velocity like ALNOR 2220 A or 2220 probe, or anemotherm air meter model 60. 2) Take number of measuring points ( should be not less than 4)based on 4 Ft long linear difffuser, and probe should be located and adjusted as to measure the maximum air velocity by facing the probe to the air flow direction on the face of the linear slot diffuser as shown. 3) Take the arithmetic average of velocity readings to obtain the Vk (average) as follows: V k ( average ( V1+V2+...+V ) = k ) K 4) 5) Determine the area factor (Ak) from previous tables considering the linear diffuser length and number of slots. Calculate the air volume ( CFM ) with the following formula : CFM = V k (average) x Ak Note Right Flow Left Flow Vertical Flow Return If the air volume calculated from above procedure is not satisfactory, repeat the same proceddure after adjusting the deflector angle. DEFLECTOR SETTING The deflector blades of the supply linear slot diffusers can be fully adjusted to give either a horizzontal / vertical air pattern, or any combination of them. The horizontal air flow adjustment may be set for either left or right hand throw. 23 Air Balancing

26 STANDARD FIXING METHOD Linear Diffuser (2 slots) with end cap from one side Linear Diffuser (2 slots) without end caps 24 Fixing Method

27 CONVERSION TABLE Quantity Imperial Unit Metric Unit From Imperial To From Metric To Metric Multiply By Imperial Multiply By Area Square foot Square meter (m 2 ) Square inch Square millimeter (mm 2 ) Density Pounds per cubic foot Kilograms per cubic meter (kg/m 3 ) Length inch millimeter (mm) foot millimeter (mm) foot meter (m) yard meter (m) Pressure inch of water column Kilopascal (kpa) foot of water column inch of mercury column ounces per square inch pounds per square inch Kilopascal (kpa) Kilopascal (kpa) Kilopascal (kpa) Kilopascal (kpa) Temperature fahrenheit celcius (ºC ) 5/9 (ºF-32) (9/5 ºC ) + 32 Velocity feet per second meters per second (m/s) feet per minute ( fpm) meters per second (m/s) miles per hour meters per second (m/s) Volume Flow Cubic feet per minute (cfm) Liters per second (L/s) Cubic feet per minute (cfm) Cubic meters per second (m 3 /s) Cubic feet per hour ( cfh) Milliliters per second( ml/s) Gallons per minute(u.s.) Liters per second( L/s) Gallons per minute(imperial) Liters per second( L/s) Table 17. Metric guide conversion factors. 25 Conversion Table

28 TESTING AND APPROVAL Different samples from DASCO air terminal devices (Linear Slot Diffusers) were tested at ITS (Intertek Testing Services) labs in accordance with: Air diffusion council test code for grilles, registers and diffusers No. ADC 1062: GRD-84. ISO 5219 Air distribution and air diffusion laboratory aerodynamic testing and rating of air terminal devices. ANSI/ASHRAE , Method of testing for rating the performance of air outlets and inlets. LINEAR SLOT DIFFUSERS WERE TESTED FOR: a. b. c. d. Sound ( Noise Criteria). Static pressure in inches W.G. Throw, feet. Ak (Area factor). 26 Testing & Approval

29 COATING WITH POWDER NOW YOU CAN ACHIEVE OPTIMAL COATING PERFORMAE ON ALL PRODUCTS YOU PAINT! DASCO offers a first class service by introducing a wide range of perfect polyester powder coating on all of its aluminium products of air terminal devices. The best quality of polyester powder Corro-Coat are used in according to the internnational standards (BS,ISO,DIN,ASTM). PE-F architectural grade polyester powders are used perfectly with pre-treatment, electrostatic spray and curing in accordance with the above standards recommendations. A complete range of RAL-Standard colours are always available in addition to a vast range of special compound colours as per our customers request. RAL Standard Colour Chart Swatch 27

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32 Since 1962 P.O. Box: 6192 Hawalli Kuwait. Tel: Fax: Product Bulletin 133-D