Supply air nozzle. Dimensions. DAD-0 With flange for mounting on a wall or duct side.
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1 A imensions A-0 With flange for mounting on a wall or duct side. Ø ( ) 0 Ø F Ø Nom 0 0 Ø A Ø B Ø E escription A is an adjustable supply air nozzle suitable for ventilation of large areas where long throws are reuired. The nozzle can be freely rotated 0 degrees in any direction in relation to the central line of the nozzle. The nozzle can be used for both heated and cooled air. The nozzle can be installed directly into a circular duct, fitting, wall or duct side. Supplied with screw holes through flange (A-0). ØF = min. hole dimension Ø nom Size ØA ØB ØE ØF Weight kg Flexible adjustable nozzle Long throws Simple installation Maintenance The visible parts of the diffuser can be wiped with a damp cloth. Materials and finish Material: Aluminium Standard finish: Powder-coated Standard colour: RAL 00, gloss 0 A- Installation in circular duct. Ø B Ø Nom 0 0 Ø A 0 The diffuser is available in other colours. Please contact Lindab s sales department for further information. Order code Product A a bbb Type with flange 0 for circular ducts Size ØNom includes male connection measure Ø nom Size ØA ØB Weight kg Free area for A nozzle see section Nozzle calculations. We reserve the right to make changes without prior notice
2 A Technical data apacity Volume flow v [l/s] and [m /h], total pressure Δp t [Pa], throw l 0. and sound level L WA [db(a)] can be seen in the diagrams. Supply air l 0. [m] A Throw l 0. Throw l 0. can be seen in the diagrams for isothermal air at a terminal velocity of 0. m/s Resulting sound effect level The sound effect level from the nozzles must be added logarithmically to the sound effect level from the flow noise in the duct. See sample calculation, section Nozzle calculations. Freuency-related sound effect level The sound effect level in the freuency band is defined as L wok = L WA + K ok. K ok values can be seen in the table below. Table entre freuency Hz Size 0 00 K K K K l 0. [m] V [l/s] V [m /h] We reserve the right to make changes without prior notice
3 alculation Resulting sound effect level To calculate the resulting sound effect level from the nozzles, add the sound effect level from the nozzles (L WA nozzle) and the sound effect level from the flow noise in the duct (L WA duct) logarithmically. iagram, sound effect duct, L WA duct. iagram, addition of sound levels. ifference to be added to the highest db value (db) ifference between the db values (db) Sample calculation: LA-00 = 00 l/s ΔP t nozzle 0 Pa uct size: In order to achieve a sensible distribution of the air out to the nozzles without using a damper, it is recoended that the pressure loss in the nozzle be times higher than the dynamic pressure in the duct system. Selected duct dimension Ø 00 Number of nozzles at joint Volume of air in the duct x 00 = 00 l/s L WA duct (can be seen in diagram ) db(a) L WA nozzle (can be seen in product diagram) db(a) ifference between db values db(a) Value to be added to the highest db value (diagram ) db(a) Resulting sound effect level: + = db(a) L W v uct uct L W v Nozzle Nozzle Extension of throw for two nozzles, positioned side by side: If two nozzles are positioned next to each other, the air jets will be amplified, thereby extending the throw. To calculate this, use the diagram below, in which the distance between the nozzles is designated. The calculation factor K must be multiplied by the throw l 0. The throw is not extended further with more nozzles. Sample calculation: LA-. istance =. metres. Volume of air: = l/s iagram throw under selected nozzle Specified throw: l 0. = m [m] / l 0. [m]. / = 0. K calculation factor an be seen in the diagram K =. Resulting throw: K x l0. =. x m =. m 0 We reserve the right to make changes without prior notice
4 alculation Supply air with cooled air α L Supply air with heated air H Y Sample calculation: Heated air LA-00: = 00 m /h Fan Final velocity Δt = -K α = 0 v x = 0, m/s = K = 0,00 00 = m 0, v x Y = K Δt = =, m 00 H = sin α = 0, =, m L = cos α = 0, =, m α H Y L = L cos α = H = L tan α Terminal velocity V : H sin α 0 v x = K eflection Y: Y = K Δt Sample calculation: ooled air LA-00: = 00 m /h Fan Final velocity Δt = -K α = 0 v x = 0, m/s v x = K = K = 0,00 00 = m v x 0, Y = K Δt = =, m 00 H = sin α = 0, =, m L = cos α = 0, =, m 00 We reserve the right to make changes without prior notice
5 alculation alculation factors: Free area K K K Size A m m /h l/s m /h l/s m /h l/s LA A G GTI Vertical supply air with heated air Sample calculation: = K x Δt LA-0 = 00 m /h Δt = 0 K (m) The distance to the turning point of the air jet: = K x (m) Δt = 0, x 00 (m) 0 =, m We reserve the right to make changes without prior notice 0
6
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