LTG Incorporated Swirl Diffusers Type DLA 7 and DLA 8 LTG Incorporated 1 Corporate Drive, Suite D Spartanburg, SC 93 PO Box 889, Spartanburg, SC 9 USA Tel: 86-599-63 Fax: 86-599-63 e-mail: info@ltg-inc.net Internet: http://www.ltg-inc.net LTG Aktiengesellschaft Grenzstrasse 7, D-7035 Stuttgart PO Box 05, D-705 Stuttgart Germany Tel: 9-711-81-180 Fax: 9-711-81-7 e-mail: raumluft@ltg-ag.de Internet: http://www.ltg-ag.de DLA7/DLA8-USA-TP-01 (1/0) 19-17
Swirl Diffusers can improve the function of air conditioning and ventilating installations Application Diffusers with swirl characteristics are often used for a direct ventilation of occupied zones in commercial and industrial facilities which require high air exchange rates e.g. restaurants, shopping centers, laboratories, offices, meeting rooms. New swirl diffuser forms of the type DLA with adjustable air distributing components offer an attractive, modern design and flexibility in terms of air flow pattern. As DLA diffusers are easily adjustable the patterns can be set to suit varying room conditions, even after installation. The highly inductive, fanned rotational flow makes it possible to handle high cooling loads and still maintain comfortable air conditions. This effect is created by flow from many individual air jets which make the diffuser suitable for small or large volume flows and variable volume systems. The recommended installation height is.5... 5 meters. above: type DLA 7 below: type DLA 8 Example for the installation of a swirl diffuser type DLA 7 E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 3
Swirl Diffusers Type DLA 7 Function The LTG Swirl Diffuser type DLA 7 is a highly inductive diffuser which may either be integrated in the ceiling or free suspended, thus offering a wide variety of possibilities and presentation. Advantages Design / Appearance - The diffuser plate is available either powder coated, to RAL reference, or chromium plated. The swirl disc is available in black or white. - All metal construction. Economy / Flexibility - Fast installation as pattern can be factory-set but subsequently modified to suit new room conditions. Comfort - Good comfort in the occupied zone is ensured by rapid decay of velocity and temperature difference of the supply jet. - Direct, efficient, ventilation of occupied zones. Range of products Model sizes: (diffuser plate nominal size) square: 0, 0, 600, 6, 800 mm round: 0, 0, 600, 6, 800 mm Air distribution plenum box galvanized sheet steel Versions: pyramid box rectangular box cylindrical box - with adjustable flow restrictor inside the spigot*, adjustment from below through the diffuser plate. * not possible with the rectangular spigot connection option. Duct connection Side or top entry (the round spigot must be bayonet installed by the customer). For small box heights a side entry rectangular connection is available. Diffuser plate Steel galvanized, visible side powder coated to RAL reference or chromium plated. Diffusing components Steel galvanized, painted in black or white Flow types The swirl disc can be set for two flow types : the tangential flow 1 and, or vertical flow. Tangential flow 1- standard setting - the air jets will attach strongly to the ceiling resulting in a fully mixed turbulent flow structure in the room, with rapid temperature and velocity decay of the jet. tangential setting 1 and vertical setting swirl disc diffuser plate swirl disc diffuser plate Tangential setting, prefered for lower volume flow rates and large cooling differentials. The outlet cross-section is reduced, thus diffusing the air with increased momentum, ensuring that the jet remains powerfully attached to the ceiling. As a result, induction effect is increased. Vertical setting, prefered setting during heating operation. In the case of the vertical flow, the air is projected conocally downwards. Flow development with: tangential setting vertical setting E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications.
Swirl Diffusers Type DLA 8 Function The LTG Swirl Diffuser type DLA 8 is a highly inductive diffuser which may either be integrated in the ceiling or free suspended, thus offering a wide variety of possibilities and presentation. Advantages Design / Appearance - The diffuser plate is available either powder coated, to RAL reference, or chromium plated. The swirl disc is available in black or white. - All metal construction. Economy / Flexibility - Fast installation as pattern can be factory-set but subsequently modified to suit new room conditions. Comfort - Good comfort in the occupied zone is ensured by rapid decay of velocity and temperature difference of the supply jet. - Direct, efficient, ventilation of occupied zones. Range of products Model sizes: (diffuser plate nominal size) square: 600, 6 mm round: 600, 6 mm Air distribution plenum box galvanized sheet steel Versions: pyramid box rectangular box cylindrical box - with adjustable flow restrictor inside the spigot*, adjustment from below through the diffuser plate. * not possible with the rectangular spigot connection option. Duct connection Side or top entry (the round spigot must be bayonet installed by the customer). For small box heights a side entry rectangular connection is available. Diffuser plate Steel galvanized, visible side powder coated to RAL reference or chromium plated. Diffusing components Steel galvanized, painted in black or white Flow types The swirl disc can be set for two flow types : the tangential flow or vertical flow. Tangential flow - standard setting - the air jets will attach strongly to the ceiling resulting in a fully mixed turbulent flow structure in the room, with rapid temperature and velocity decay of the jet. swirl disc diffuser plate tangential flow swirl disc vertical flow diffuser plate Vertical setting, prefered setting during heating operation. In the case of the vertical flow, the air is projected conocally downwards. Flow development with: tangential setting vertical setting E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 5
Swirl Diffusers type DLA 7 and DLA 8 Diffuser plate versions Model / Design 0 0 600 6 800 DLA 7 Version: square DLA 7 Version: round DLA 8 Version: square DLA 8 Version: round E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 6
Selection diagram for DLA 7 with DEU (flow restrictor), model 0, spigot 199 mm (tangential setting) - 1 t[k] cmax [cm/s] a(c max )[m] 5 3 1,5 1 0,5 H> m H= 3,5m H= 3..,75m exhaust with diffusing element + 8 db air mode 90_ without diffusing element - 1 db 0 1 35 5 0 0 3 0 0 stated acoustics at tangential setting 1 α V. 0 p [Pa] 0 80 60 15 8 6 [m 3 /h] Legend V = volume flow [m 3 /h] t zu = supply air temperature [ C] t RA = room air temperature [ C] t = temperature difference between supply air and room air [K] p = pressure loss [Pa] L WA = sound power level [db(a)] a(c max )= spread at which the maximum speed of the jet air has been measured [m] c max = maximum speed of jet air with uniformly distributed heat loads [cm/s] H = installation height [m] Note: The stated L WA -values are valid for the tangential setting 1. With the vertical setting, the level is db lower, with the tangential setting the level is 1 db higher. Model 0 recommended volume flow V [m 3 /h] recom. height of diffused air H [m].5...5.0 recom. distance between two diffusers (distance to wall a/) a [m] 3.0...3.5 Selection example see page 9 E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 7
Selection diagram for DLA 7 with DEU (flow restrictor), model 0, spigot 3 mm (tangential setting) - 1 t[k] cmax [cm/s] a(c max )[m] 5 3 1,5 1 0,5 H> m H= 3,5m H= 3..,75m 35 5 α 0 p [Pa] 0 80 60 15 8 6 exhaust with diffusing element + 3.5 db air mode 90_ without diffusing element - 15 db 1 0 0 3 0 0 600 V. stated acoustics at tangential setting 1 [m 3 /h] Legend V = volume flow [m 3 /h] t zu = supply air temperature [ C] t RA = room air temperature [ C] t = temperature difference between supply air and room air [K] p = pressure loss [Pa] L WA = sound power level [db(a)] a(c max )= spread at which the maximum speed of the jet air has been measured [m] c max = maximum speed of jet air with uniformly distributed heat loads [cm/s] H = installation height [m] Note: The stated L WA -values are valid for the tangential setting 1. With the vertical setting, the level is db lower, with the tangential setting the level is 1 db higher. Model 0 recommended volume flow V [m 3 /h] 0 recom. height of diffused air H [m].5...5.0 recom. distance between two diffusers (distance to wall a/) a [m] 3.0...3.5 Selection example see page 9 E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 8
Selection diagram for DLA 7 with DEU (flow restrictor), model 600/ 6, spigot 80 mm (tangential setting) - 1 t[k] cmax [cm/s] a(c max )[m] 5 3 1,5 1 0,5 H> m H= 3,5m H= 3..,75m exhaust with diffusing element + 0 db air mode 90_ without diffusing element - 13 db Legend V = volume flow [m 3 /h] t zu = supply air temperature [ C] t RA = room air temperature [ C] t = temperature difference between supply air and room air [K] p = pressure loss [Pa] L WA = sound power level [db(a)] a(c max )= spread at which the maximum speed of the jet air has been measured [m] c max = maximum speed of jet air with uniformly distributed heat loads [cm/s] H = installation height [m] Selection example in the diagram DLA model 600/6: V zu = 0 m 3 /h 35 0 0 3 0 0 600 800 stated acoustics at tangential setting 1 5 α V. 0 p [Pa] 0 80 60 15 8 6 5 [m 3 /h] p = 17 Pa L WA = 38 db(a) t = K a(c max ).3 m c max 15 cm/s H =.75 m Note: The stated L WA -values are valid for the tangential setting 1. With the vertical setting, the level is db lower, with the tangential setting the level is 1 db higher. Model 600/6 recommended volume flow V [m 3 /h] 0 recom. height of diffused air H [m].5...5.0 recom. distance between two diffusers (distance to wall a/) a [m] 3.0...3.5 E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 9
Selection diagram for DLA 7 with DEU (flow restrictor), model 800, spigot 80 mm (tangential setting) - 1 t[k] cmax [cm/s] a(c max )[m] 5 3 1,5 1 0,5 H> m H= 3,5m H= 3..,75m exhaust with diffusing element + 5 db air mode 90_ without diffusing element - 5 db 35 5 0 0 30 0 600 800 00 stated acoustics at tangential setting 1 V. [m 3 /h] α 0 p [Pa] 0 80 15 8 6 Legend V = volume flow [m 3 /h] t zu = supply air temperature [ C] t RA = room air temperature [ C] t = temperature difference between supply air and room air [K] p = pressure loss [Pa] L WA = sound power level [db(a)] a(c max )= spread at which the maximum speed of the jet air has been measured [m] c max = maximum speed of jet air with uniformly distributed heat loads [cm/s] H = installation height [m] Note: The stated L WA -values are valid for the tangential setting 1. With the vertical setting, the level is db lower, with the tangential setting the level is 1 db higher. Model 800 recommended volume flow V [m 3 /h] 7 recom. height of diffused air H [m].5...5.0 recom. distance between two diffusers (distance to wall a/) a [m] 3.0...3.5 Selection example see page 9 E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications.
Selection diagram for DLA 7 with DEU (flow restrictor), rectangular box, model 800, spigot 315 mm (tangential setting) - 1 t[k] cmax [cm/s] a(c max )[m] 5 3 1,5 1 0,5 H> m H= 3,5m H= 3..,75m exhaust with diffusing element - 1 db air mode 90_ without diffusing element - 13 db 35 0 80 p [Pa] 8 0 3 0 0 600 800 00 V. stated acoustics at tangential setting 1 [m 3 /h] 5 15 6 Legend V = volume flow [m 3 /h] t zu = supply air temperature [ C] t RA = room air temperature [ C] t = temperature difference between supply air and room air [K] p = pressure loss [Pa] L WA = sound power level [db(a)] a(c max )= spread at which the maximum speed of the jet air has been measured [m] c max = maximum speed of jet air with uniformly distributed heat loads [cm/s] H = installation height [m] Note: The stated L WA -values are valid for the tangential setting 1. With the vertical setting, the level is db lower, with the tangential setting the level is 1 db higher. Model 800 recommended volume flow V [m 3 /h] 7 recom. height of diffused air H [m].5...5.0 recom. distance between two diffusers (distance to wall a/) a [m] 3.0...3.5 Selection example see page 9 E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 11
Selection diagram for DLA 8 with DEU (flow restrictor), pyramid box, model 600/ 6, spigot 80 mm (tangential setting) t[k] cmax [cm/s] a(c max )[m] t[k] t[k] t[k] 35 5 α 0 80 p [Pa] 15 8 6 exhaust with diffusing element + db air mode 90_ without diffusing element - db 0 0 30 0 600 800 00 V. stated acoustics are also valid fort vertical setting [m 3 /h] Legend V = volume flow [m 3 /h] t zu = supply air temperature [ C] t RA = room air temperature [ C] t = temperature difference between supply air and room air [K] p = pressure loss [Pa] L WA = sound power level [db(a)] a(c max )= spread at which the maximum speed of the jet air has been measured [m] c max = maximum speed of jet air with uniformly distributed heat loads [cm/s] H = installation height [m] Selection example in the diagram DLA model 600/6: V zu = 700 m 3 /h p = 9 Pa L WA = 36 db(a) t = K a(c max ).1 m c max 1 cm/s H =.75 m Model 600/6 recommended volume flow V [m 3 /h] 7 recom. height of diffused air H [m].75...5.0 recom. distance between two diffusers (distance to wall a/) a [m].0...3.0 E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 1
Selection diagram for DLA 8 with DEU (flow restrictor), pyramid box, model 600/ 6, spigot 315 mm (tangential setting) t[k] cmax [cm/s] a(c max )[m] t[k] t[k] t[k] 35 5 α 0 80 p [Pa] 15 8 6 exhaust with diffusing element + 3 db air mode 90_ without diffusing element db 0 30 0 600 800 00 V. 1 [m 3 /h] stated acoustics are also valid fort vertical setting Legend V = volume flow [m 3 /h] t zu = supply air temperature [ C] t RA = room air temperature [ C] t = temperature difference between supply air and room air [K] p = pressure loss [Pa] L WA = sound power level [db(a)] a(c max )= spread at which the maximum speed of the jet air has been measured [m] c max = maximum speed of jet air with uniformly distributed heat loads [cm/s] H = installation height [m] Model 600/6 recommended volume flow V [m 3 /h] 7 recom. height of diffused air H [m].75...5.0 recom. distance between two diffusers (distance to wall a/) a [m].0...3.0 Selection example see page 1 E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 13
Swirl diffusers type DLA 7 and DLA 8 53 C H at model 600/6 Dimensions of ceiling diffuser DLA with pyramid box, circular connection X installation plaster ceiling G installation grid ceiling ca.1 model 6 ca.6 ca.1 model 6 ca.6 Dimensions air distribution box DLA with pyramid box and lateral connection for round supply ducts BG 0 0 600 6 800 V A* 398 98 598 63 798 B 66 118 117 117 C 8 0 35 35 58 Ød 199 3 79 G 79 G 79 G E 31 31 31 31 F 81 81 81 93 81 G 6 86 86 86 - H 9 363 375** 375** 575 * Tolerance + 1/ - 0.5 mm ** box executed as pyramid stump G at DLA 8: Ø d = 31 Features - Minimum loss of energy on the surface. - Stacking boxes with a minimum transport volume. - Integrated flow restrictor, to be adjusted from below, through the diffuser. Delivery in closed position. - Diffuser plate is delivered separately. - Detached connecting piece enclosed. - Flexible hose connection. For insertion and removal of the box, simply tilt. No need to disconnect. - The pyramid boxes, sizes 0-6, are being fastened in the center. The air diffuser plate of size 800 is being fastened from the outside using 8 screws. Acoustics and drag reduction of flow restrictor Please consider the flap s direction of rotation! p The setting of the flow restrictor should be performed according to the direction of rotation shown in the diagram. E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 1
Swirl Diffusers type DLA 7 and DLA8 9 (3x) Dimensions of the air distribution box DLA with cylindrical box and lateral connection for round supply ducts. Dimensions of swirl diffuser DLA, lateral round connection Model 0 0 600 6 800 A* [mm] 398 98 598 63 798 B [mm] 377 77 577 577 777 H [mm] 0 335 375 375 67 d [mm] 199 3 79 79 79 L [mm] 60 60 60 Dimensions DLA, circular lateral connection. Other dimensions on request. DLA with cylindrical box and circular connection from above 9 (3x) Swirl diffuser DLA, round connection from above (sound powerlevel + 3 db) Model 0 0 600 6 800 A* [mm] 398 98 598 63 798 Dimensions DLA, circular connection B [mm] 377 77 577 577 777 from above. Other dimensions on re- quest. d [mm] 199 3 79 79 79 L [mm] 6 66 66 66 66 * Tolerance +1/-0,5 mm E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 15
Swirl Diffusers type DLA 7 and DLA 8 Dimensions of the air distribution box DLA with rectangular box and lateral connection for round supply ducts. Dimensions of swirl diffuser DLA, lateral round connection Model 0 0 600 6 800 A* [mm] 398 98 598 63 798 B [mm] 366 66 566 566 766 Dimensions DLA, circular lateral H [mm] 0 335 375 375 70 connection. Other dimensions on re- d [mm] 199 3 79 79 79 quest. L [mm] 60 80 80 80 80 DLA with rectangular box and lateral rectangular connection (Meinig). Swirl diffuser DLA, lateral rectangular connection DLA with rectangular box and circular connection from above. Swirl diffuser DLA, round connection from above (sound power level + 3 db) Model 0 0 600 6 800 Dimensions DLA, circular connection A* [mm] 398 98 598 63 798 from above and lateral rectangular connection. Other dimensions on re- B [mm] 366 66 566 566 766 quest. d [mm] 199 3 79 79 79 E [mm] 315 0 0 0 7 L [mm] 6 66 66 66 66 * Tolerance +1/-0,5 mm E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 16
Swirl Diffusers Type DLA 7 and DLA 8 Installation The LTG diffuser DLA can be installed flush to ceiling or covering the joints in intermediate ceilings or freely suspended on the existing suspension holes of the box. The diffuser plate is connected to the air supply box with screws. Installation flush to ceiling for intermediate ceilings, with lateral duct connection. Nomenclature DLA Free suspension above a grid ceiling. 600 / Q / D / 7 / P90 / W / SR / DEU Model (side length or in mm) 0; 0; 600; 6; 800 (DLA 8 only model 600 and 6) Form of diffuser plate Q = square R = round Diffusing element O = exhaust air, without nozzles D = swirl disc Version / Design 7, 8 Surface of the diffuser plate P... = powder coated similar to RAL (state RAL number!) Colour of swirl disc S, W, or similar to RAL (state colour code!) Air distribution box with spigot - - = without SR = box with lateral round spigot and flow restrictor (DEU) OR= box with round spigot on top and flow restrictor (DEU) SE = box with lateral rectangular spigot (only rectangular box) P = pyramid box with lateral round connection and flow restrictor (DEU) Flow restrictor DEU = flow restrictor, adjustable through the diffuser, from below (not possible for box type SE) E LTG Incorporated PO Box 889 Spartanburg, SC 9/USA 86/599-63 Fax 86/599-63 DLA7/DLA8 -USA -TP (1/0) e -mail: info@ltg -Inc.net Internet: www.ltg -Inc.net Former editions are invalid. Subject to technical modifications. 17