Air distribution systems. Radial outlet RA-N2...

Transcription

1 Air distribution systems Radial outlet RA-N... DS E 0.01

2 Radial outlet RA-N Preliminary remark KRANTZ KOMPONENTEN radial outlets RA-N have fixed radial vanes and are available with circular or square face. They generate high-quality diffuse air flow according to the principle of turbulent mixing air flow. They can be installed flush with closed false ceilings or square tile ceilings, above open grid or expanded metal ceilings, or freely suspended from the ceiling. Installation options The following connection types are available for connection to the duct system: RA-N radial outlets achieve a high level of thermal comfort and can be used for volume flow rates up to l/s [1 0 m /h] at temperature differences up to 1 K when cooling and + K when heating ( m) or + K (> m)., with reducer for duct connection Mode of operation The radial outlet 1 discharges the supply air in the horizontal direction, a feature which is enhanced by the slanting exit. The high-turbulence supply air jets induce a large proportion of indoor air, which leads to fast temperature equalization of supply air and indoor air as well as to a rapid decrease in jet velocity. Thanks to its stable supply air distribution pattern at low sound power levels this outlet can be used safely for a wide range of air volume flow rates. Connection type D, with connection box for closed false ceilings Construction design The RA-N outlet with circular face is available in sizes (DN 0 to DN 00) and is fitted on the outside with a flush contact edge for ceiling attachment (see detail Y on page ). The RA-N outlet with square face is available in sizes r(dn 0 to DN 0). The square face with all-side 0 turn-up (Q1 and Q) is designed for installation in square tile ceilings (see detail Z on page ). Connection type F, with connection box for square tile ceilings Both outlet models are made of powder coated sheet metal and are fastened to the reducer or connection box with a screw whose head is concealed by a cap a having the same powder coating as the outlet. Application Volume flow rate DN l/s V A min m /h l/s V A max m /h Max. temperature difference supply air indoor air DJ 1 K when cooling + K when heating ( m) + K when heating (> m) DS E p

3 Radial outlet RA-N The A reducer is fitted with or suspension brackets for fixing to the ceiling as well as with a threaded device for the central fastening of the outlet. The reducer can be connected to spiral seam or flexible ducts. For installation in a closed false ceiling upon completion of said ceiling, the radial outlet with flush contact edge shall be inserted into the reducer through the ceiling cutout and screwed up. Connection type D The RA-N outlet is connected to the duct system via the lateral spigot of a flat connection box. This connection type is well suited for outlets to be installed above open or closed false ceilings. The connection box is fitted with suspension brackets for fixing to the ceiling and a threaded device for the central fastening of the outlet. The optional volume flow damper positioned in the lateral connection spigot can be adjusted through the openings of the radial outlet. Connection type F This connection type is particularly suitable for square tile ceilings. The square radial outlet with connection box is inserted into the ceiling from the top, in place of a ceiling tile. The connection box is fixed to the load-bearing ceiling and the outlet is screwed to the connection box via the central fastener. Design specifications Basically, the radial outlet RA-N can also be installed freely suspended from the ceiling regardless of its connection type. Radial outlets discharging supply air may be positioned close to return air openings or inlets. Disruptions in jet dispersion or risks of short-circuiting are ruled out if the height difference between the planes of return air intake and supply air discharge is minimum 0. If the radial outlet and the return air opening or inlet are in the same plane, the horizontal centre spacing should be at least five times the nominal diameter ( x DN) of the outlet. Sketches of installation options 1) Closed false ceiling 1 x DN Open grid ceiling Installation in closed false ceiling Placement above open grid ceiling 1 x DN 1 Connection type D 1) t DS E p Supply air duct Radial outlet with connection type D Open grid ceiling Return air duct Concrete ceiling Radial outlets installed above an open grid ceiling. The return air is removed evenly through the whole ceiling and extracted by the return air duct positioned iediately above the outlets. d a d Installation in a closed false ceiling with medium thickness 'd' (d a) and very low ceiling plenum Connection type F H Installation in a square tile ceiling with d < H (air outlet with square face) 1) For circular or square face

4 Radial outlet RA-N Dimensions of outlet element and connection type A Circular outlet RA-N-RS Y ø DN 1 ø DN ø D 1) ø D ø DN+0 ) ø D X H H H Y ; a ø DN ø D 1) ø D ø 0 1 H H Detail X Square outlet RA-N-Q1 or RA-N-Q Detail Y RS - circular face Flush contact edge for ceiling attachment Detail Z Q1 and Q - square face 0 turn-up for installation in square tile ceilings Z ø D 1) E H H Key for all pages Material 1 Radial outlet galvanized sheet metal, powder coated Reducer aluminium Duct connection Connection box galvanized sheet metal Fastening screw a Screw cap brass, powder coated Acoustic lining (optional) mineral wool Sleeve at box D Connection spigot at box Volume flow damper (optional) galvanized sheet metal 1 Bore for suspension by others 1 Threaded rod or quick fastener (by others) 1 Adjustment device for volume flow damper Central fastener for radial outlet Suspension bracket RA-N-RS RA-N-Q1 RA-N-Q RA-N-RS with reducer A Nom. ø DN D 1) H D H W E ) W E ) W D H H W ) Ceiling cutout ) Nominal diameters ³ ø DN have a third suspension bracket at a 0 angle DS E p ) Other dimensions on request

5 Radial outlet RA-N Dimensions of connection types D and F Connection type D L B L 1 L B 0 ø D 1 0 H H 1a B 1 B L 0 X B 1 a H 1 ; a ø DN ø D 1) ø D View A Suspension with quick fastener (by others) 0. Connection type F ) Detail Y RS - circular face Flush contact edge for ceiling attachment 1b View A Suspension with threaded rod M and lock nuts (by others) L 1 L B 1 Detail X ø ø D 1 ø x 0 A 1 H 1 ; a ø DN E Z DS E p Nom. ø DN D 1) L D L 1 X B L B B/ B H Connection type D H H D L a t W E ) B B 1 Connection type F ) Ceiling cutout ) Other dimensions on request 1 Detail Z Q1 and Q - square face 0 turn-up for installation in square tile ceilings H L L W ) ) Connection box F for square face Q1 or Q ) Weight inclusive of air outlet for E =

6 Radial outlet RA-N Comfort criteria and minimum air outlet centre spacing Comfort criteria 1) The outlet layout must comply with the maximum allowable indoor air velocities u in the occupied zone in the cooling mode. The indoor air velocity depends on the cooling load that is to be removed from the room. The maximum specific cooling capacity q depends on the discharge height and the maximum allowable indoor air velocity u (Graph 1). Graph 1 enables to determine for the cooling mode the maximum specific volume flow rate V Sp max in relation to the maximum specific cooling capacity and the maximum temperature difference DJ max. The volume flow rate supplied to the room V Sp tats may not exceed this value. Key for layout: V A = volume flow rate per air outlet in l/s V A max = max. volume flow rate per air outlet when cooling in l/s V A min = min. volume flow rate per air outlet when cooling in l/s V Sp max = max. specific volume flow rate per m of floor area in l/(s m ) V Sp tats = actual specific volume flow rate per m of floor area in l/(s m ) u = max. allowable indoor air velocity in m/s q = max. specific cooling capacity in W/m DJ max = max. temperature difference supply air to return air in K t min = minimum air outlet centre spacing in m H = discharge height in m L WA = sound power level in db(a) ref. -1 W Dp t = total pressure drop in Pa Graph enables to determine the minimum centre spacing between two outlets on the basis of the maximum specific volume flow rate. Temperature difference max K K 1 K Maximum allowable indoor air velocity u in m/s Maximum specific volume flow rate V Sp max in l/(s m ) Maximum specific cooling capacity q in W/m Discharge height H in m. Graph 1: Maximum specific volume flow rate 1) See our brochure ref. TB Layout specifications for thermal comfort Minimum air outlet centre spacing t min in m Minimum air outlet centre spacing t min in m Max. specific volume flow rate V Sp max in l/(s m ) Air outlet volume flow rate V A in l/s Max. specific volume flow rate V Sp max in l/(s m ) 00 Graph : Minimum air outlet centre spacing 0 Air outlet volume flow rate V A in l/s DS E p. 0.01

7 Radial outlet RA-N Layout sheet D and F The diagram values for sound power level and pressure drop of connection types D and F apply to volume flow damper position open and connection box without acoustic lining. With acoustic lining the sound power level is approx. db(a) lower than mentioned in the diagram. The pressure drop is not influenced by the acoustic lining. V A min applies to the freely suspended design. V A max m /h l/s V A l/s DN DN 00 DN V A min DN 00 V A min DN 0 DN DN 1 DN 0 DN 00 DN DN 0 DN 00 DN DN 1 DN 0 DN 0 DN 0 DN 00 DN DN 1 DN 0 DN 0 00 DN 0 V A min DN V A min DN 0 V A min DN V A min DN 0 0 Connection types D/F V 0 A min DN Discharge height H in m Sound power level L WA in db(a) ref. -1 W Total pressure drop p t in Pa DS E p Layout examples Connection type DN A DN 0 F Application Office Department store 1 Supply air volume flow rate V l/s 0 0 Discharge height H m Floor area A m 1 00 Max. allowable sound power level L WA db(a) ref. -1 W 0 Temperature difference DJ max K 1 1 Comfort criteria (see page ) Max. allowable indoor air velocity u m/s Max. specific volume flow rate V Sp max l/(s m ) Actual specific volume flow rate [from 1 : ] V Sp tats l/(s m ) Criterion is met if V Sp tats < V Sp max From nomogram DN DN 0 V A max l/s 1 Z [³ V : V A max] units V A [V : Z] l/s 1 0 L WA db(a) ref. -1 W 1 Dp t Pa 0 1 t min [Graph, p. ] m».1».

8 Radial outlet RA-N Sound power level and insertion loss of RA-N used as supply air outlet Connection types D and F DN 0 DN 0 DN 1 DN DN 00 DN 0 DN 00 Air outlet volume flow rate V A Total pressure drop Dp t Connection types D and F Sound power level L W in db ref. -1 W Air outlet volume flow rate Total Sound power level L W in db ref. -1 W pressure Octave band centre frequency in Hz V A drop Octave band centre frequency in Hz L WA Dp t L WA l/s m /h Pa db(a) K K K l/s m /h Pa db(a) K K K Insertion loss in db Insertion loss in db Connection box without acoustic lining Connection box with acoustic lining Octave band centre frequency in Hz Octave band centre frequency in Hz DN K K K DN K K K DS E p. 0.01

9 Radial outlet RA-N Sound power level of RA-N used as return air inlet V E m /h l/s V E m /h l/s Connection types D and F Air inlet volume flow rate V E DN 00 DN 0 DN 00 DN DN 1 DN 0 DN 0 DN 00 DN 0 DN 00 DN DN 1 DN 0 DN 0 Air inlet volume flow rate V E DN 00 DN 0 DN 00 DN DN 1 DN 0 DN 0 DN 00 DN 0 DN 00 DN DN 1 DN 0 DN Sound power level L WA Total pressure drop in db(a) ref. -1 W p t in Pa Sound power level L WA in db(a) ref. -1 W Total pressure drop p t in Pa DS E p DN 0 DN 0 DN 1 DN DN 00 DN 0 DN 00 Connection types D and F Air inlet Total Sound power level L W in db ref. -1 W Air inlet Total Sound power level L W in db ref. -1 W volume flow pressure volume flow pressure rate drop Octave band centre frequency in Hz rate drop Octave band centre frequency in Hz V E Dp t L WA V E Dp t L WA l/s m /h Pa db(a) K K K l/s m /h Pa db(a) K K K

10 Radial outlet RA-N Features Type code For high-quality diffuse indoor air flow Discharge height from. to. m depending on outlet size Maximum temperature difference between supply air and indoor air: 1 K when cooling, + K when heating (+ K up to m room height) Low sound power level Stable supply air jets, even at minimum volume flow rate For installation flush with ceiling, above open grid or expanded metal ceilings, or freely suspended from the ceiling Outlet element mountable from room side Available with circular or square face Outlet element made of powder coated sheet metal, connection box made of galvanized sheet metal Low construction height Combinable with reducer or connection box Optional volume flow damper adjustable from room side Optional acoustic lining Can be used as return air inlet, regardless of connection type RA-N DN Radial outlet Geometry Connection type Damper Insulation Surface finish Geometry RS = circular face Q1 = square face for square tile ceiling 00 x 00 Q = square face for square tile ceiling x 0 = DN 0 00 = DN 00 0 = DN 0 0 = DN 0 1 = DN 1 00 = DN 00 = DN Connection type O = no connection piece (only outlet element) A = reducer (connection type A) D = connection box (connection type D), external sleeve F = connection box (connection type F), for square face Damper O = no volume flow damper R = with volume flow damper adjustable from room Insulation O = without acoustic lining I = with acoustic lining (connection type D) Surface finish 0 = face painted to RAL 0, semi-matt. = face painted to RAL. Tender text... units Radial outlet for high-quality indoor air flow with minimal temperature gradient in the occupied zone, consisting of: radial outlet element in low construction design with spigot and radial vanes vane undersides flush with surrounding face area, either with circular face for ceiling attachment or with square face with all-side turn-up for installation in a square tile ceiling, and with central fastening screw with cap; connection to the duct system either via a reducer fitted with lateral suspension brackets and connection for the central fastener of the outlet, or via a connection box with connection spigot for circular outlet or a connection box for square outlet, with central fastener for fixing the outlet and flange bores for suspension; optional volume flow damper adjustable from room side; optional acoustic lining (only for connection type D). Materials: Radial outlet made of galvanized sheet metal, powder coated to RAL 0, pure white, or RAL... Reducer made of aluminium Connection box made of galvanized sheet metal Make: Type: Subject to technical alterations. KRANTZ KOMPONENTEN RA-N DN DS E p Krantz GmbH Uersfeld, 0 Aachen, Germany Phone: Fax: info@krantz.de