Krantz Variable twist outlet with guide ring DD-VL... jet straightener DD-VG... Air distribution systems DS E 01.18
Variable twist outlet with guide ring or jet straightener Preliminary remarks The variable twist outlet with guide ring generates turbulent mixing ventilation and is used for air supply where there is no significant pollutant load. It is very well suited for high rooms or halls where it is placed above the occupied zone. The variable twist outlet with guide ring designed for duct connection has excellent acoustic properties. It can therefore be used in rooms calling for low sound pressure levels such as broadcasting studios, theatres and concert halls. If fitted with a jet straightener, this outlet can achieve large vertical penetration depths in heating mode, at high temperature differences between supply air and indoor air. For this reason it is also eminently suitable for use in high halls such as exhibition halls and painting hangars. Construction design and function The air outlet mainly consists of the outer cylinder 1, the core tube 2, the rounded exit 3 and the individual twist vanes 4. The twist vanes are fixed to the outer cylinder and the core tube. The rounded exit is fitted with a coaxially mobile guide ring whose height can be adjusted by a lift from 0 to resp. 1, depending on the outlet size. So the discharge direction of the air jets can be adjusted from horizontal (when cooling) to vertical down (when heating), manually or with an electric actuator. The variable twist outlet with guide ring is used for discharge heights of 3 to 12 m. A jet straightener 7 is inserted in the guide ring for discharge heights of up to m. Variable twist outlet Top: with guide ring; bottom: with jet straightener The air outlet can be connected to the duct system either directly using a circular duct to EN 1 or via a connection box. It may also be connected to the bottom of a rectangular duct via a spigot to be provided by the client (for details see page 3). Size DN DN 0 DN 0 DN 0 DN 0 Volume flow rate 1 Discharge height with guide ring jet straightener m 3 /h 0 m m Max. temperature difference DJ max between supply air and return air 3 9 3 1 0 9 3 0 4 10 4 0 1 0 1 0 0 4 10 4 22 8 2 0 9 000 11 2 1 100 3 0 4 000 1 12 when cooling + when heating, with guide ring + K when heating, with jet straightener www.krantz.de DS E p. 2 01.18 Jet dispersion made visible with smoke tracer Top: cooling mode - The cool supply air is discharged horizontally and flows downwards slowly and evenly Bottom: heating mode - The warm vertical supply air jets penetrate deep into the occupied zone, left: with guide ring, right: with jet straightener 2 Krantz
Variable twist outlet with guide ring or jet straightener Dimensions Connection to circular duct Connection to rectangular duct with spigot 8 ø D 1 ø D 1 14 1 H 8 4 1 12 2) H 2 3 12 12 Nom. ø DN 7 H 7 Nom. ø DN ø D 4 L L 3 L 1 Connection to connection box 1 11 9 12a ø D H H H 7 ø D 4 L L 3 ø 9 ø D 1 12a H 1 B ø DN + 2 2) B + 2 www.krantz.de DS E p. 3 01.18 Nom. ø DN ø D 4 12 2) 10 H 12 H 7 Key 1 Outer cylinder 2 Core tube 3 Exit 4 Twist vane Guide ring Actuator 7 Jet straightener 8 Circular duct 1 Connection box viewed from the top Size Dimensions Weight in kg 1) L L 1 L 3 B H H 1 H H H 7 max H 8 min ø D 1 ø D 3) 2 ø D 4 ø D Air outlet With connection box DN 3 3 0 19 0 90 0 4 0 4 1. DN 0 0 0 4 4 77 2 0 10 0 9 0 9 8 23.0 DN 0 0 9 2 0 100 7 9 8 9 11.0 DN 0 790 0 0 0 1 18 2 0 110 9 8 1 0 8 1.0 DN 0 8 100 790 7 7 1 2 0 1 1 0 9 1 0 1 2 9.0 ø 9 9 Connection box 10 Sleeve at connection box 11 Connection spigot 12 L-fastener 2) (on 2 sides) 12a Screw connection to box bottom 14 Rectangular duct 1 Spigot for duct connection 1 Hole for suspension 1) Without actuator; weight of actuator 0. 0.8 kg 3) Ceiling cutout 2) In case of connection to a box and mounting flush with the ceiling, the L-fastener is positioned inside (ø DN ) Krantz 3
Variable twist outlet with guide ring or jet straightener Comfort criteria Comfort criteria 1) The outlet layout must comply with the maximum allowable indoor air velocities u in the occupied zone in 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 act may not exceed this value. Graph 2 enables to determine the minimum centre spacing between two outlets on the basis of the maximum specific volume flow rate. Temperature difference max 8 K 2 0 2 0 1 1 10 100 10 Maximum specific volume flow rate V Sp max in l/(s m 2 ) Maximum specific cooling capacity q in W/m 2 Discharge height H in m 2.7 4 10 Key for layout: = volume flow rate per air outlet in min H = min. volume flow rate per air outlet in, when heating, with DJ =..K V Sp max = max. specific volume flow rate per m 2 in l/(s m 2 ) V Sp act = actual specific volume flow rate per m 2 of floor area in l/(s m 2 ) u = max. allowable indoor air velocity in m/s q = max. specific cooling capacity in W/m 2 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. 10-12 W Dp t = total pressure drop in Pa Z = Number of air outlets = duct connection, vertical discharge = duct connection, horizontal discharge = connection box, vertical discharge = connection box, horizontal discharge 1) See our brochure ref. TB Layout specifications for thermal comfort 8 10 0 0 0 0.1 0.2 0.3 0. Maximum allowable indoor air velocity u in m/s Graph 1: Maximum specific volume flow rate 4 Krantz Layout example Outlet type, Size Assembly shop for electrical equipment Guide ring, DN Aircraft assembly hangar Jet straightener, DN 0 Connection to Circular duct Connetion box 1 Supply air volume flow rate V 8 890 7 000 2 Discharge height H m 7 3 Floor area A m 2 1 4 0 4 Max. allowable sound power level L WA db(a) ref.10-12 W 7 Max. temperature difference supply air to indoor air: DJ cooling K DJ heating K Comfort criteria Max. allowable return air velocity u m/s Max. specific volume flow rate V Sp max l/(s m 2 ) Actual specific volume flow rate [from 1 : 3] V Sp act l/(s m 2 ) Criterion is met if V Sp act < V Sp max From nomogram 10 7. 0.2 7 min H 4 [at DJ =7.] 8 8 0. 14 2 111 [at DJ = ] 8 selected 2 83 9 Z [from 1 : 8] units 18 3 10 L WA max db(a) 7 11 Dp t max Pa 8 1 12 t min m 7.8 10.2 Min. air outlet centre spacing t min in m Min. air outlet centre spacing t min in m 7 Max. specific volume flow rate V Sp max in l/(s m 2 ) 2 1 0 0 0 0 0 0 Air outlet volume flow rate in 1 14 13 12 11 10 9 8 7 2 0 0 1 0 2 0 Air outlet volume flow rate in Graph 2: Minimum air outlet centre spacing 10 Max. specific volume flow rate V Sp max in l/(s m 2 ) 1 1 www.krantz.de DS E p. 4 01.18
Variable twist outlet DD-VL with guide ring Layout sheet DN to DN 0 min H DN 2 0 0 0 0 7. 0 0 0 + + + + 0 0 0 0 0 0 1 1 3 4 7 8 9 2 10 100 0 0 min H DN 0 3 0 0 7. 0 + + + 0 0 0 3 K 0 0 0 0 0 0 0 4 7 8 9 10 2 10 100 0 www.krantz.de DS E p. 01.18 000 000 4 000 min H 1 0 0 DN 0 7. 3 K 1 0 1 0 1 0 0 + + + + 0 0 0 0 1 0 0 0 4 7 8 9 10 7 10 100 1 0 Krantz
Variable twist outlet DD-VL with guide ring Layout sheet DN 0 to DN 0 min H DN 0 9 0 9 000 8 000 7 000 000 2 0 7. 2 0 + + + 000 3 K 4 000 8 8 7 8 9 10 11 12 100 1 min H DN 0 1 10 000 9 000 8 000 7 000 2 0 7. 2 0 + + + + 000 1 0 3 K 1 0 000 4 000 1 100 1 100 7 8 9 10 11 12 7 100 1 0 www.krantz.de DS E p. 01.18 Krantz
Variable twist outlet DD-VL with guide ring Layout sheet www.krantz.de DS E p. 7 01.18 Air outlet volume flow rate Duct connection Total pressure drop Sound power level L W in db ref. 10-12 W Connection box Total pressure drop Sound power level L W in db ref. 10-12 W Dp t L WA Octave band centre frequency in Hz Dp t L WA Octave band centre frequency in Hz m 3 /h Pa db(a) 12 2 0 1 K 2 K 4 K 8 K Pa db(a) 12 2 0 1 K 2 K 4 K 8 K Variable twist outlet with guide ring DN 0 1 0 DN 0 1 0 8 DN 0 2 0 1 110 4 000 1 0 0 DN 0 1 0 000 1 0 2 2 8 000 DN 0 1 0 000 2 2 8 000 3 0 1 27 27 11 11 17 19 77 81 81 1 1 10 10 13 13 3 3 22 22 24 24 3 23 29 8 14 1 23 2 17 19 2 2 10 90 90 1 1 24 24 9 9 107 107 2 2 84 84 12 12 102 102 193 193 3 27 29 14 1 2 82 87 18 19 <1 <1 11 23 Krantz 7
Variable twist outlet DD-VG with jet straightener Layout sheet DN to DN 0 min H DN 2 0 0 0 0 0 0 0 8 K 7 K K 0 0 0 0 0 0 1 3 4 1 7 8 9 10 11 12 13 14 1 2 7 10 100 0 min H 3 0 0 0 DN 0 8 K K 0 0 0 0 0 0 4 000 000 4 000 0 0 0 0 8 10 12 14 1 18 7 10 100 0 min H 1 0 0 DN 0 8 K K 1 0 0 + www.krantz.de DS E p. 8 01.18 0 0 0 0 1 0 8 Krantz 0 4 0 8 10 12 14 1 18 22 7 10 100 1 0
Variable twist outlet DD-VG with jet straightener Layout sheet DN 0 to DN 0 DN 0 9 0 9 000 min H 2 0 2 0 8 000 7 000 8 K K 000 000 4 000 1 10 000 9 000 8 8 10 1 2 10 100 0 min H 2 0 DN 0 8 K K 2 0 8 000 7 000 000 1 0 1 0 000 www.krantz.de DS E p. 9 01.18 4 000 1 100 1 100 8 10 12 14 1 18 22 24 2 7 10 100 1 0 Krantz 9
Variable twist outlet DD-VG with guide ring or jet straightener Sound power level and pressure drop Air outlet volume flow rate Duct connection Total pressure drop Sound power level L W in db ref. 10-12 W Connection box Total pressure drop Sound power level L W in db ref. 10-12 W Dp t L WA Octave band centre frequency in Hz Dp t L WA Octave band centre frequency in Hz m 3 /h Pa db(a) 12 2 0 1 K 2 K 4 K 8 K Pa db(a) 12 2 0 1 K 2 K 4 K 8 K Variable twist outlet with jet straightener DN 0 1 0 DN 0 1 0 8 DN 0 2 0 1 110 4 000 1 0 0 DN 0 1 0 000 1 0 2 2 8 000 DN 0 1 0 000 2 2 8 000 3 0 1 2 100 1 79 112 81 103 1 19 93 104 1 90 13 1 7 77 77 3 2 3 24 23 1 27 14 11 2 2 27 77 90 118 1 8 2 104 1 103 127 19 2 8 102 1 1 108 123 4 2 82 77 79 7 77 79 7 7 7 29 22 1 <1 2 18 19 23 7 www.krantz.de DS E p. 10 01.18 rantz
Variable twist outlet Type code, Features and tender text Type code Features www.krantz.de DS E p. 11 01.18 DD - DN Variable twist outlet Function / Kind Size Connection type Adjustment Surface finish Function / Kind VL = variable with guide ring VG = variable with jet straightener Size DN, DN 0, DN 0, DN 0, DN 0 Connection type R = duct connection with rivets or screws K = connection box 1) Adjustment DN + DN 0 DN 0 DN 0 MA = manual E7 = Belimo actuator, 0 10 V modulation, rotation drive type NM24A-SR E8 = Belimo actuator, 3-point drive, 24 V, rotation drive type NM24A E9 = Belimo actuator, 3-point drive, 2 V, rotation drive type NM2A E10 = Belimo actuator, 0 10 V modulation, rotation drive type SM24A-SR E11 = Belimo actuator, 3-point type, 24 V, rotation drive type SM24A E12 = Belimo actuator, 3-point type, 2 V, rotation drive type SM2A E13 = Siemens actuator, 0 10 V modulation, rotation drive type GLB1.1E E14 = Siemens actuator, 3-point type, 24 V, rotation drive type GLB1.1E E1 = Siemens actuator, 3-point type, 2 V, rotation drive type GLB1.1E E19 = Siemens actuator 0 10 V modulation, rotation drive type GEB1.1E E = Siemens actuator, 3-point type, 24 V, rotation drive type GEB1.1E E21 = Siemens actuator, 3-point type, 2 V, rotation drive type GEB1.1E Surface finish... = face painted to RAL... Turbulent mixing ventilation Volume flow rate range from 1 to 3 0 [0 to 1 m 3 /h] Jet penetration depth adaptable to room height and thermal load Even temperature and humidity distribution throughout the room Discharge direction adjustable from horizontal to vertical down Adjustment manually or with electric actuator Discharge height for outlet with guide ring: 3 to 12 m, for outlet with jet straightener: best from 3 to m Maximum temperature difference supply air to return air: when cooling and + when heating, with guide ring + K when heating, with jet straightener Sizes DN, DN 0, DN 0, DN 0 and DN 0 Low weight as the main components are made of aluminium The air outlet is powder coated to a RAL colour Different connection types Accelerated heating-up For coercial and industrial applications Tender text... units Variable twist outlet for air supply from great discharge heights, with high-induction radial air jets and discharge direction adjustable from horizontal to vertical down, suitable for cooling and heating with great temperature differences between supply air and return air, consisting of: outer cylinder with straight intake for connection to a circular duct, core tube, rounded exit, and twist vanes fixed between outer cylinder and core tube; with adjustable guide ring for discharge heights of 3 to 12 m and also with jet straightener for great discharge heights of 3 to m; adjustment either manually or with electric actuator. Connection to the duct system either directly to a circular duct to EN 1, with L-fasteners, or via a connection box with connection spigot. Material: Air outlet made of aluminium powder coated to RAL. Connection box made of galvanized sheet metal Make: Type: Subject to technical alteration. 1) L-fastener outside with ceiling-flush installation, inside with freely suspended installation Krantz DD - DN Krantz 11
Krantz GmbH Uersfeld 24, 0 Aachen, Germany Phone: + 2 4-1 Fax: + 2 4- info@krantz.de www.krantz.de DS E 01.18