Displacement Flow Diffusers

Transcription

1 T 1.3/1/EN/2 Displacement Flow Diffusers Types QLE QLF for low turbulence air supply TROX GmbH Telephone +9/28 / Telefax +9/28 /26 Heinrich-Trox-Platz D0 Neukirchen-Vluyn

2 Contents Description Description 2 Construction Dimensions 3 Materials 3 Nomenclature Quick Selection Selection Examples Pressure Drop Acoustic Data 6 Aerodynamic Data QLE 8 Aerodynamic Data QLF 9 Order Details 16 The displacement flow units types QLE and QLF are primarily employed in comfort conditioning. As opposed to the familiar principle of mixed air flow through ceiling or wall diffusers, displacement flow units guarantee low-turbulence air supply. The discharge velocity is very low. While with mixed flows it is preferable to achieve as high an induction as possible (by mixing room air with the supply air stream), the principle of displacement flow ventilation is to achieve an induction rate as low as possible. Depending on the degree of activity of the persons in the occupied zone, the supply air can enter the space with a temperature difference of -1K to K in relation to the room air. The air spreads out on the floor and is lifted up by convection currents from heat sources (machines, electrical equipment, people, etc.). The fresh air, therefore, finds its own path to the heat source from which the heat load must be removed. Should the heat source be people, this provides them also with fresh air. With the principle of displacement ventilation, the exhaust air locations should be arranged at high room level. With an even distribution of displacement flow diffusers, even large halls (e. g. auditoria, industrial factories) can be air-conditioned without draughts in an economical manner. Type QLE Type QLF-O-1 Type QLF-O-3 2

3 Construction Dimensions Materials Construction The displacement flow diffusers types QLE and QLF are manufactured with rectangular spigots optionally located at the top or at the bottom. An inserted perforated sheet steel basket is fitted to ensure even air distribution. Special features of the type QLE: The perforated metal face plate is hooked onto the casing. This enables easy removal. Special features of the type QLF: These units can be supplied on request with a single direction of discharge (face area) or a three way discharge (face and side areas). Materials Casing, perforated face plate and perforated sheet steel basket are made of galvanised sheet steel. Casing and perforated face plate are pre-treated and powder-coated white RAL 90, gloss level 0%. The rear surface of the casing and the perforated sheet steel basket are coated black RAL 900. Standard sizes QLE QLF H* B* in mm in mm QLE QLE QLE 0 QLE QLE QLE 0 QLF QLF QLE QLE QLE 600 QLF QLF QLF QLE QLE QLE 0 QLF QLF QLF QLE QLE QLE 00 QLF QLF 120 QLF QLF 00 QLF QLF QLF QLF QLF 00 QLF QLF *H x B = Dimensions of perforated area of the face plate (QLF) = Discharge opening in the casing (QLE) Construction types QLE QLE-O * B x H (mm) = Discharge opening in the casing QLE-U Dimensions QLE Size A H applicable for all widths (00 / 120 / 00) Removal of the face plate Fitting of the face plate 3

4 Construction Dimensions Nomenclature Nomenclature: in l/s m; m 3 /h m: Volume flow rate per meter (width) t in l/s; m 3 /h Total volume flow rate per diffuser L in m: Distance from diffuser to calculate ƒ L and t L ƒ L in m/s: Maximum flow velocity at distance L from diffuser and distance 0.1 m above floor t Z in C: Supply air temperature t 1,1 in C: Temperature at 1.1 m room height in C: Temperature at 0.1 m above floor t 0,1 t L t 0,1 p t1 p t3 L WA t L : Temperature difference t t Z : Temperature difference t t in Pa: Pressure drop for discharge in one direction in Pa: Pressure drop for discharge in three directions (~ 0.9 x p t1 ) in db(a): A-weighted sound power level : Temperature difference at distance L between room and core temperature v totmin = 0.1 m/s v totmax = 0.3 m/s Construction QLF Type QLF-O Type QLF-U 1-directional discharge 3-directional discharge A C C 3 H+0 H* H+0 H* 3 B* B+0 A B* B+0 Rectangular air connection spigot, either on top or bottom Perforated face plate Casing Integral perforated sheet steel basket Perforated side plates right and left for 3-directional discharge T Dimensions QLF Size Dimensions in mm H* x B* A C T 0 x x x x x x x x T

5 Quick Selection Examples H x B Quick Selection QLE V. t min V. t max V. t min V. t max V. min V. max l/s l/s m 3 /h m 3 /h l/s m l/s m 0 x x x x x x x x x x x x x x x H x B Quick Selection QLF - 1 V. t min V. t max V. t min V. t max L WA min L WA max l/s l/s m 3 /h m 3 /h db(a) db(a) 0 x < 26 0 x < x < x < x < 28 0 x < 0 x < 2 0 x < 2 00 x < x < x < x < x < x < 29 x < 26 x < x < x < 00 x < 33 Quick Selection QLF - 3 H x B V. t min V. t max V. t min V. t max L WA min L WA max l/s l/s m 3 /h m 3 /h db(a) db(a) 0 x < 0 x < x < 600 x < 600 x < 0 x < 0 x < 2 0 x < x < 3 00 x < x < x < x < x < 2 x < 39 x < 2 x < 3 00 x < 3 00 x < 3 Selection example QLE Data given: Volume flow rate per meter Distance from diffuser: Supply air temperature difference: Max. allowed air velocity on the floor: = 80 l/s m L = 2 m t z = K Size and width of the displacement flow diffuser have to be determined. Quick selection table: ƒ L max = 0.3 m/s Rough estimate: Size 0, 600 or 0 selected: at B = 00, 120 Size 600 or 00 IEOEP Width 120 Diagramme 2: Total pressure drop t = (80 l/s m) 1.2 = 0 l/s p t1 = 1. Pa Diagramme 18: ƒ L = 0.26 m/s Air flow velocity Diagramme 19: Temperature difference at t Z = - K results in a t L = - 2 K Selection example QLF Data given: Total volume flow rate: t = 00 m 3 /h Distance from diffuser: L = 1. m Supply air temperature difference: t z = K Quick selection table QLF-1: Size selected: Height 120 Width 0 Diagramme 8: L WA < db(a); p t1 < Pa Diagramme : ƒ L = 0.21 m/s Diagramme : t L = 1.9 K

6 Pressure Drop Acoustic Data Type QLE 1 Pressure drop QLE B = 00 mm 2 Pressure drop QLE B = 120 mm Pressure drop p t1 in Pa Size 3 Pressure drop QLE B = 00 mm Note: Applicable for all QLE sizes: L WA < db(a) Pressure drop p t1 in Pa Pressure drop p t1 in Pa Size Size Type QLF ( p t3 = 0,9 x p t1 ) Sound power level and pressure drop QLF 0 x... Pressure drop p t1 in Pa t L WA in db(a) l/s m 3 /h Pressure drop p t1 in Pa t Sound power level and pressure drop QLF 600 x l/s m 3 /h L WA in db(a)

7 Pressure Drop Acoustic Data 6 Sound power level and pressure drop QLF 0 x Sound power level and pressure drop QLF 00 x Pressure drop p t1 in Pa 2 3 L WA in db(a) Pressure drop p t1 in Pa 2 3 L WA in db(a) t 60 l/s t 80 l/s m 3 /h m 3 /h Sound power level and pressure drop QLF 120 x Sound power level and pressure drop QLF 00 x Pressure drop p t1 in Pa 2 3 L WA in db(a) Pressure drop p t1 in Pa 2 3 L WA in db(a) 0 l/s t 0 00 m 3 /h l/s t m 3 /h Sound power level and pressure drop QLF x Sound power level and pressure drop QLF 00 x Pressure drop p t1 in Pa 2 3 L WA in db(a) Pressure drop p t1 in Pa 2 3 L WA in db(a) l/s t 00 m 3 /h l/s t 00 m 3 /h

8 Aerodynamic Data QLE Type QLE (Diagramme values referring to m) 12 Air flow velocity size 0 13 Temperature difference size 0 1 Air flow velocity size 0 Temperature difference size 0 16 Air flow velocity size 0 1 Temperature difference size 0 8

9 Aerodynamic Data QLE QLF 18 Air flow velocity size Temperature difference size 600 Air flow velocity size 0 21 Temperature difference size 0 Type QLF 22 Air flow velocity size 0 x 0 23 Temperature difference size 0 x 0 t=2 (90) (2) () (36) t L 0,

10 Aerodynamic Data QLF 2 Air flow velocities size 0 x 0 2 Temperature difference size 0 x 0 t= (8) 2 (90) (2) () t L 0, Air flow velocities size 600 x 0 2 Temperature difference size 600 x 0 = K (2) () t= (8) (1) t=0 (180) (1) (8) 2 (90) t in l/s 0 2 m 3 /h t L t L 0, Air flow velocities size 600 x 0 29 Temperature difference size 600 x 0 0, 1 2 3

11 Aerodynamic Data QLF Air flow velocities size 600 x Temperature difference size 600 x 600 (216) 0 (180) (1) (8) t=60 t in l/s 60 0 m 3 /h = K t=0 (8) (2) (180) (1) t L t L 0, Air flow velocities size 0 x 0 33 Temperature difference size 0 x 0 0, Air flow velocities size 0 x Temperature difference size 0 x 600 = K 60 (216) 0 (180) (1) t=0 (22) t L 0,

12 Aerodynamic Data QLF 36 Air flow velocities size 0 x 0 3 Temperature difference size 0 x 0 = K t=0 (360) 80 (288) 60 (216) 0 (180) t L 0, Air flow velocities size 00 x Temperature difference size 00 x 600 = K t=1 (32) 0 (360) 80 (288) 60 (216) t L 0, Air flow velocities size 00 x 0 1 Temperature difference size 00 x 0 = K t=1 (32) 0 (360) 80 (288) 60 (216) t L 0,

13 Aerodynamic Data QLF 2 Air flow velocities size 120 x Temperature difference size 120 x 600 = K t=1 (68) 1 (396) 90 (32) 0 (22) = K t=1 (0) 1 (32) 0 (360) 90 (32) t L t L 0, Air flow velocities size 120 x 0 Temperature difference size 120 x 0 0, Air flow velocities size 00 x 0 Temperature difference size 00 x 0 t=160 (6) 1 (68) 0 (360) 0 (22) t L 0,

14 Aerodynamic Data QLF 8 Air flow velocities size 00 x 00 9 Temperature difference size 00 x 00 t=20 (900) () (360) () t in l/s m 3 /h t L 0, Air flow velocities size x 0 1 Temperature difference size x 0 0 t=20 (900) 0 () 0 () 0 (360), t L Entfernung L in in m 0, Air flow velocities size x 00 3 Temperature difference size x 00 0 t = 0 (1) 0 (80) 0 () 0 (), t L 0,

15 Aerodynamic Data QLF Air flow velocities size x 120 Temperature difference size x 120 = 0 K t L, , Entfernung L in in mm 6 Air flow velocities size 00 x 00 Temperature difference size 00 x , t in l/s m 3 /h t L 0, Air flow velocities size 00 x Temperature difference size 00 x 120 = 0 K t in l/s m 3 /h t L, , 1 2 3

16 Order Details Specification Text The displacement flow units types QLE and QLF consist of a casing with a perforated metal face plate (for one-directional discharge) or additional perforated metal side plates (for threedirectional discharge), a rectangular spigot located either on top or at the bottom of the unit as required, and an internal perforated plate basket for even air distribution. Materials Casing, perforated face plate and perforated sheet steel basket are made of galvanised sheet steel. Casing and perforated plates are pre-treated and powdercoated white RAL 90, gloss level 0 %, any other RAL colour is optional. The rear surface ot the casing and the perforated sheet steel basket are coated black RAL 900. Order code These codes do not need to be completed for standard products QLE - O - 1 / 0 x 120 / 0 / 0 / P1 / RAL 9016 Design changes reserved All rights reserved TROX GmbH (9/08) Type QLE Type QLF IEOEP Air connection spigot top bottom O U Discharge 1) 1-directional 1 3-directional 3 1) Only for type QLF 2) GE = gloss level Accessories Fixing material QLF-BM / P1 / RAL9016 (2 fixing angles, self tapping screws) Order example Make: TROX Type: QLE - O / 0 x 120 IEOEP IEOEP QLE in mm H x B 0 x x x x x QLF in mm H x B 0 x x x x x x 0 00 x x Not used Order example Make: TROX Type: QLF - O - 3 / 0 x 600 / P1 / RAL 9016 TEZEU IEOEP State colour 0 Standard finish powder-coated to RAL 90 (GE 0 %) 2) P1 Powder-coated to RAL 9006 (GE %) 2) other colours to RAL... (GE 0 %) 2) 16