Krantz Components. Twist outlet DD-N... for ceiling installation. Air distribution systems

Transcription

1 Krantz Components Twist outlet DD-N... for ceiling installation Air distribution systems DS E 0.

2 Twist outlet Preliminary remarks and construction design Preliminary remarks Twist outlets for ceiling installation are proven air outlets from Krantz Components for the coercial and industrial sectors. Thanks to their favourable aerodynamics and acoustics, their attractive appearance and easy installation, these outlets have been put to successful use for decades. They are particularly suitable for coercial rooms with high-quality indoor air flow requirements such as office buildings, schools, hospitals, etc. b a Construction design The twist outlet consists of the spigot a with shaped circular face b and built-in twist vanes c. The twist outlet is fastened centrally with the plug. Connection type A a b c Twist outlet Different connection types are available for connecting the twist outlet to the duct system: Connection type AF Connection type A ) In connection type A, a reducer is used for duct connection. On the one side of the reducer is the sleeve a for the twist outlet and on the other side is the duct connection spigot b. The reducer is fitted with two L-suspensions on opposite sides for fastening the outlet to the ceiling. Connection type A is largely used for fitting twist outlets into closed false ceilings or above open grid ceilings. Connection type AF ) Connection type AF is essentially the same as connection type A except that here the reducer with the flange is fitted on the false ceiling from above and the twist outlet is inserted from below through the false ceiling until it is flush with it. The distance between the circular face of the twist outlet and the support flange of the reducer AF is variable; it can be adjusted to the thickness of the false ceiling. Connection types D and E ) The connection to the duct system is made via a flat connection box. In connection type D, the twist outlet is fitted onto an external sleeve ; in connection type E, it is inserted into the connection box, with the face b being flush with the box bottom. The connection via connection box is effective in rooms with low ceiling plenums: connection type D with thicker false ceilings, connection type E with thinner false ceilings. Connection type E is also advantageous for outlets placed above an open grid ceiling or exposed. DS E p. 0. With connection types A and AF twist outlets can be used at very low cost. ) See also installation options on page Krantz Components

3 Twist outlet Mode of operation, return air inlets, sound power level and pressure drop In general: With all connection types the twist outlet is inserted from below and fastened at the plug with a central screw. A side of the connection box is fitted with a spigot for connection to a flexible or spiral seam duct. This spigot may be fitted with a volume flow damper adjustable from the room. The connection box is also available with acoustic lining for higher insertion loss. The advantages of the connection box are low height, simple volume flow rate setting and good insertion loss. Twist outlet with perforated cover screen Connection type D Mode of operation The vanes of the air outlet produce a twist effect and the curved exit causes an additional horizontal jet deflection. The horizontal, radial jets bring about an intensive admixture of indoor air and, as a result, rapid equalization of supply air temperature with indoor air temperature. Twist outlets from Krantz Components belong to the diffuse air distribution system where there is no steady air jet pattern in the occupied zone. Thanks to the very high induction effect of the supply air jets, the vertical and horizontal temperature distribution is extremely even in air-conditioned rooms. Twist outlets can be used up to a temperature difference of K when cooling and + K when heating. Return air inlets Twist outlets can also be used as return air inlets. This applies for all connection types. A return air inlet with cover screen (without twist vanes) is also part of our standard range of products. DS E p. 0. Connection type E Perforated cover screen Where a visually plane ceiling surface is required, a perforated cover screen is available for the twist outlet. This cover screen is fastened from below with the central screw. Sound power level and pressure drop Typical features of Krantz Components twist outlets are low sound power level and pressure drop. These depend on size, connection type and volume flow rate. For example, for a DN twist outlet with connection type D and a volume flow rate of about l/s [0 m /h]: sound power level = db(a) ref. - W pressure drop = Pa. For diagrams and tables see pages. Krantz Components

4 Twist outlet Design specifications and features Design specifications The twist outlets can be installed in closed false ceilings, visibly, or above open grid ceilings, i.e. invisible from the room. This is made very easy by the different connection types. The vertical distance between the upper edge of the open grid ceiling and the discharge level should be ³ x DN. In air distribution with twist outlets, supply air and return air openings may be located close together. Disruptions in jet dispersion or short-circuiting are ruled out if the height difference between the lower edge of the return air opening and the discharge level of the twist outlet is kept to min.. If the twist outlet and the return air opening are at the same level, the horizontal centre spacing should amount to at least five times the nominal diameter ( x DN). x DN Concrete ceiling Return air duct Twist outlet Open grid ceiling Supply air duct Features Diffuse air distribution system Maximum temperature difference between supply air and indoor air: K when cooling, + K when heating (+ K up to m room height) Example of supply air distribution via twist outlets above an open grid ceiling. The return air is removed evenly over the whole ceiling and extracted via a return air duct placed above the twist outlets. Stable jet pattern also at minimum volume flow rate Discharge height from. to. m Low sound power level Installation options: inside a false ceiling, above an open grid ceiling, or exposed Twist element easy to mount from below and to fasten with central screw Twist element made from polystyrene or aluminium Optionally available with perforated cover screen for visually plane ceiling surface Twist outlet installed in a closed false ceiling Connection types A and AF with reducer for connection to flexible duct Connection types D and E with connection box and spigot; connection box D with built-in volume flow damper adjustable from room; connection box E with volume flow damper adjustable at the spigot or from room; connection boxes D and E optionally available with acoustic lining The twist outlets (with all connection types) can also be used as return air inlets A return air inlet with cover screen is available as standard for sizes DN to DN DS E p. 0. Twist outlet in the entrance hall of DEA Mineralöl AG, Hamburg / D Krantz Components

5 Twist outlet Installation options Connection type A Connection type D Closed false ceiling H ) d Installation in closed false ceiling with larger thickness (d < H ). Connection type E Installation in closed false ceiling DS E p. 0. d = a ) x DN s x DN H ) Placement above open grid ceiling Connection type AF Open grid ceiling Visible installation (without false ceiling) d Installation in very thin false ceilings (from plasterboard or sheet metal) with low ceiling plenums. A seal is to be inserted by the client between the connection box and the false ceiling. H ) H ) Reducer with flange for fitting on false ceiling. The size a is variable; it corresponds to the thickness d of the false ceiling. Installation above open grid ceilings, particularly effective with very low plenums. ) See tables on pages and Krantz Components

6 Twist outlet, connection types A and AF Dimensions ø D ø DN + Connection type A ø D Connection type AF ø D X R H A H A H A ø D ø D R H AF a ) H AF H AF ø DN ø D ) Detail X ø DN ø D ) ø D ø D a ø DN + ø D ø D + DN 0 ø D + > DN 0 Y H ) H A + ø Connection type A with perforated cover screen ) Detail Y b H ) Key for all pages Material Twist outlet Polystyrene or aluminium Reducer Aluminium Connection box Galvanized sheet metal Plug with internal thread Polystyrene or aluminium Acoustic lining (optional) Sleeve Connection spigot Volume flow damper (optional) Fastener for twist outlet up to DN 0 with M thread from DN with M thread L-suspension ) Bore for suspension Suspension device a Quick fastener (by others) b Threaded rod (by others) Adjustment device for volume flow damper (optional) Flange Perforated cover screen a Spacer b Spacer ring (for DN to DN 0) Mineral wool with glass fibre mat, non-flaable Galvanized sheet metal or steel Aluminium Nom. ø Material of H A H A H A H AF H AF H AF H ) min D ) D D D D D R a ) Weight in kg DN twist outlet A AF Polystyrene 0 to Polystyrene to Polystyrene 0 0 to Polystyrene to 0..0 Polystyrene 0 0 to Aluminium 0 0 to.. Polystyrene to Aluminium 0 0 to..0 Aluminium 0 0 to..0 ) Ceiling cutout ) Size DN has a third L-suspension offset at 0 ) Other heights on request ) Variable ) Also available for connection types AF, D and E DS E p. 0. Krantz Components

7 L L L B B ø t Twist outlet, connection types D and E Dimensions ) Detail E ø D H H ø x A R H ø DN ø D ) Connection box D ø D a E View A Suspension with quick fastener B L L B b ø D H/ H View A Suspension with threaded rod M and lock nuts H L L ø DN ø D ) Connection box E ø D DS E p. 0. Nom. ø DN Material of twist outlet D ) D R L L B B H E Connection box D H H D ) Ceiling cutout ) With perforated cover screen, see connection type A on page L L t W kg L B H Connection box E Polystyrene Polystyrene Polystyrene Polystyrene Polystyrene Aluminium 0.. Polystyrene Aluminium.. Aluminium H D L L L W kg Krantz Components

8 Twist outlet Comfort criteria Comfort criteria ) 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 ). Graph 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 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. - 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 K 0 Maximum specific volume flow rate V Sp max in l/(s m ) Maximum specific cooling capacity q in W/m Graph : Max. specific volume flow rate 0. Discharge height H in m. Maximum allowable indoor air velocity u in m/s 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 ) DS E p. 0. ) See our brochure ref. TB Layout specifications for thermal comfort 0 0 Air outlet volume flow rate V A in l/s Graph : Minimum air outlet centre spacing Krantz Components

9 Twist outlet DN DN Connection types A, AF, D and E Nomogram Anschlussart A AF D und E V A max m /h l/s DN 0 V A l/s The sound power levels for connection types A and AF apply for vertical air supply to the air outlet. The chart values for sound power level and pressure drop for connection types D and E apply for damper position open and connection box without acoustic lining. With acoustic lining, the sound power levels are about db(a) lower than indicated in the chart. The pressure drop is not affected by the acoustic lining. For outlets with perforated cover screens, the sound power levels are approx. to db(a) higher than indicated in the chart and the pressure drops about % higher. DN DN 0 0 DN DN DN 0 0 DN V A min DN DN DN 0 DN 0 DN 0 DN 0 DN 0 DN 0 0 DN 0 V A min DN V A min DN DN DN DN DN DN DN V A min DN 0 DS E p. 0. V A min DN 0 Connection type Connection type A and AF A and AF V A min D and E D and E DN a. DN Discharge height H in m Sound power level L WA in db(a) ref. - W Pressure drop p t in Pa Layout example Size (Connection type D) DN 0 DN DN Application Office Bank Department store Supply air volume flow rate V l/s 0 0 Discharge height H m... Floor area A m Max. allowable sound power level L WA db(a) ref. - W Comfort criteria (see page ) Max. allowable indoor air velocity u m/s Max. specific volume flow rate V Sp max at DJ max = K l/(s m )... Actual specific volume flow rate V Sp tats [from : ] l/(s m )... Criterion is met if V Sp tats < V Sp max From nomogram Size DN 0 DN DN V A max l/s Z [V : V A] units V A [V : Z] l/s L WA db(a) ref. - W»»» Dp t Pa»»» t min [Graph on page ] m».».». Krantz Components

10 Twist outlet DN DN Connection types A, AF, D and E Sound power level Size DN DN DN 0 DN 0 DN DN DN Air outlet volume flow rate V A Total pressure drop ) Connection types A and AF Connection types D and E Sound power level L W in db ref. - W ) Total pressure Sound power level L W in db ref. - W ) L ) WA Octave band centre frequency in Hz drop +) L ) WA Octave band centre frequency in Hz l/s m /h Dp t in Pa db(a) Dp t in Pa db(a) ) Values apply for vertical air supply to the air outlet. They are higher for connection to flexible duct and 0 elbow. ) Applies for damper position open and connection box without acoustic lining. With lining, the values are lower by about db(a) ref. - W. The pressure drop is not affected by the acoustic lining. ) For outlets with perforated cover screens, the sound power levels are higher than in the table by approx. to db(a) ref. - W and the pressure drop values are higher by about %. Size Insertion loss in db Connection box without acoustic lining Octave band centre frequency in Hz DN Size Insertion loss in db Connection box with acoustic lining Octave band centre frequency in Hz DN DS E p. 0. Krantz Components

11 Single twist outlet element Dimensions and sound power level nomogram Nom. ø ø D ø D Material of twist outlet s H Plug with internal thread M or M D D ) D H s Plug internal thread D ø. Min. ) volume flow rate DN l/s m /h Polystyrene.0 Polystyrene.0 Polystyrene 0.0 M 0 Polystyrene Polystyrene 0.0 Polystyrene.0 0 Aluminium 0. Polystyrene M Aluminium. Aluminium. 0 ) The maximum volume flow rate depends on the discharge height, see nomogram (page ) ) Ceiling cutout Size Air outlet volume flow rate Total pressure drop Sound power level L W in db ref. - W V A Dp t L WA Octave band centre frequency in Hz DN l/s m /h Pa db(a) Note: The chart and table values apply for axial air supply to twist outlets with plugs. Single twist outlet elements are also available with perforated cover screens (for dimensions see page ). With perforated cover screen, the sound power levels are higher than indicated here by approx. to db(a) ref. - W and the pressure drops about % higher. DS E p. 0. Total pressure drop p t in Pa DN DN DN DN DN DN DN 0 DN 0 DN 0 DN 0 DN DN DN DN DN DN 0 Sound power level L WA in db(a) ref. - W 0 0 l/s m /h Air outlet volume flow rate V A Krantz Components

12 Twist outlet as return air inlet and return air inlet with perforated cover screen Connection types A and AF ) Connection types D and E ) Total pressure drop p t in Pa p t DN DN DN 0 DN 0 DN DN DN 0 Total pressure drop p t in Pa p t DN DN DN 0 DN 0 DN DN DN 0 L WA DN DN DN 0 DN 0 DN DN DN Sound power level L WA in db(a) ref. - W L WA DN DN DN 0 DN 0 DN DN DN Sound power level L WA in db(a) ref. - W 0 0 l/s 0 0 l/s m/h Return air volume flow rate V E Single element ) Return air volume flow rate V E Return air inlet with perforated cover screen ) m /h Duct connection Ceiling installation Total pressure drop p t in Pa H AF + * DN : p t < Pa at 0 l/s [ 000 m /h] p t L WA DN DN DN DN DN 0 DN 0 DN 0 DN 0 DN DN DN DN DN * 0 Sound power level L WA in db(a) ref. - W Total pressure drop p t in Pa p t L WA DN DN DN DN DN 0 DN 0 DN 0 DN 0 DN DN DN DN DN DN 0 Sound power level L WA in db(a) ref. - W DS E p l/s 0 0 l/s Return air volume flow rate V E Krantz Components m /h Dimensions as for application as supply air outlet: ) Pages and ; ) Page ; ) Page, type AF Return air volume flow rate V E m /h

13 Twist outlet Type code as supply air outlet DD-N _ DN _ as return air inlet DA-L DN Twist outlet Material Size Connection type Damper Insulation Painting Surface finish Accessories Return air inlet Size Surface finish Material K = Plastic A = Aluminium Size Plastic Aluminium = DN = DN = DN 0 = DN 0 0 = DN 0 = DN = DN = DN Size: = DN = DN 0 = DN 0 0 = DN 0 = DN = DN = DN Surface finish 0 = face painted to RAL 0, semi-matt 0 = face painted to RAL 0, semi-matt. = face painted to RAL Connection type O = no connection piece (only discharge element) A = reducer (connection type A) AF = reducer with support flange (connection type AF) D = connection box (connection type D), external sleeve E = connection box (connection type E), outlet flush with connection box L = perforated hood ) DS E p. 0. Damper O = no volume flow damper R = with volume flow damper adjustable from room S = with volume flow damper adjustable at spigot ) Insulation O = without acoustic lining I = with acoustic lining Painting P = powder-coated (for the aluminium type) N = wet painted (for the plastic type) E = body tinted (only for the plastic type) Surface finish 0 = face painted to RAL 0, semi-matt 0 = face painted to RAL 0, semi-matt. = face painted to RAL Accessories O = none L = perforated cover ) Available for connection box of type E ) Perforated hood for supply air to increase pressure upon request Krantz Components

14 Twist outlet Tender text Supply air outlet... units Twist outlet with high induction effect for diffuse air flow in room at minimum temperature gradients in the occupied zone, consisting of: twist outlet element with spigot, circular face and twist vanes, optionally fitted with perforated cover screen for visually plane ceiling surface, duct connection via reducer with lateral L-suspensions or reducer with support flange for placement on false ceiling and with lateral L-suspensions, each type of reducer with central fastener for air outlet, or connection via flat connection box with connection spigot and central fastener for air outlet, including flange bores for suspension, with optional volume flow damper adjustable from room or for connection type E adjustable at spigot, box optionally fitted with acoustic lining. Return air inlet with perforated cover screen )... units Return air inlet with perforated cover screen consisting of: perforated cover screen with circular face, reducer with flange and lateral L-suspensions, including central fastener for perforated cover screen. Material: Perforated cover screen made of aluminium, powder-coated to RAL 0, pure white Reducer made of aluminium with support flange Make : Type: Krantz Components DA-L DN Material: Twist outlet element made of polystyrene, body-tinted to RAL 0, agate grey, or wet painted to RAL 0, pure white ) Twist outlet element made of aluminium in natural colour or powder-coated to RAL 0, pure white + ) Perforated cover screen made of aluminium, powder-coated to RAL 0, pure white ) Reducer made of aluminium Reducer made of aluminium with support flange Connection box made of galvanized sheet metal Make : Type: Krantz Components DD-N _ DN _ Subject to technical alterations. ) Applies for return air inlet with perforated cover screen, see page. Where supply air outlets are used as return air inlets, the tender text is the same as for supply air outlets. ) Other colours on request ) Only sizes DN, DN and DN available Distributore in esclusiva per l Italia: F.C.R. Filtrazione Condizionamento Riscaldamento SpA Via E. Fermi, - 0 Cinisello Balsamo (MI) - Italy phone fax fcr@fcr.it DS E p. 0. Krantz Components