VLD/VLV Industrial diffusers

Transcription

1 DAL358 MADE IN VLD/VLV Industrial diffusers catalog 116

2 Table of content Description and benefits 1 Configuration 2 Mode of operation 3 Range of application and quick selection 4 Performance diagrams Temperature behavior and examples 5 Vertical penetration 6 Dimensions 8 Installation sample 8 Specifications 9 Codification 9 NAD Klima All rights reserved VLD, VLV and NAD Klima are registred trademarks, operated under licenses by Equipement NAD inc The information contained in this catologue is subject to change Refer to the digital version on www nadklimacom Version 2019

3 Presentation and benefits VLD VLV The VLD and VLV diffusers have been specifically designed for industrial applications They are made of steel and aluminum and come with adjustable guide bladesthese blades orientate the air jet horizontaly and vertically orientation of the air jet without influencing airflow balance Blades adjustment can be done manually with cables or with a motor When the blades are closed, the VLD achieves a maximum range in cooling mode, due to the large holes in the wall In the closed position, the VLV, with its perforated surface, generates a short range horizontal air movement The VLV can create a decontaminated zone Benefits - Air flow direction adjustment from horizontal to vertical - Reduction of air speeds and temperature variances - Localized air diffusion in areas of high heat or pollution - Low pressure loss and low acoustic level - Manual blade adjustment with cable - Possibility of adapting a motorized system, even after installation - Installation without a plenum Areas of application Industrial workshops - Retail spaces - Laboratories - Polluted workplaces - Training rooms - For heights from 3 m to 15 m 1

4 Configuration The VLD / VLV consists of an outer surface (1) made of stainless steel with large holes or a perforated plate, a coupling collar (2) and four guide blades (3) modulating the diffuser according to the desired air flow (4) The blades are interconnected (5) to a rack gear (6), which is manually or mechanically activated All of these parts form a system that can be connected directly to a circular duct without a plenum VLD VLV NAD Klima, Sherbrooke, Qc NAD Klima, Sherbrooke Canada 2

5 Mode of operation When the blades are closed, air entering the diffuser exits horizontally through the side wall (Figure 1) By gradually opening the four blades, the flow will be directed downwards until it reaches a vertical pattern (Figure 2) The blades ratation axis produce a helical flow, especially when the blades are between 0 and 45 At low speed, and when the VLV blades are completely closed, the output speed will be relatively small and will produce a local displacement distribution (pollution control) (Figure 3) Figure 1: VLD with closed blades Figure 2: VLD with opened blades Figure 3: VLV with closed blades (low speed) Cooling mode / horizontal jet The internal and external sources of heat, which originate, for example, from production and / or solar radiation, must be removed by the ventilation system To do this, the cold air circulating horizontally allows a high induction of warm air above a workstation, without creating drafts Heating mode / vertical jet with the VLD diffuser When the four blades are opened, the hot air is blown with high momentum into the work area The same flow will be achieved with the VLV diffuser Stale air discharge with the VLV (cleanup) diffuser In high temperature working areas, it is possible to create a temperate zone In production areas with harmful substances, pollutants must be evacuated without beeing mixed with ambient air This is achieved by diffusion through displacement distribution Both applications are realized through a partial opening of the blades The flow expansion can be modified by changing blade position 3

6 Aerodynamic data, range of application and quick selection Aerodynamic data Range of application and quick selection Nominal size DN 250 L WA (db) V 0 (m 3 /h) p (Pa) Minimum space (m) ~2 2 4 y (m) DN 500 DN 315 DN < ~ DN 0 DN 315 DN < DN 250 Specifications: The minimum space for an installation height of 35m when the air speed in the occupied area doesn t exceed 02 m/s Heated air penetration height T = + 15 C m 3 /h cfm Débit d air V 0 Range of application : minimum ideal maximum VLV flow range for stale air ventilation to discharge (pollution) Kraft Canada, Montréal, Canada 4

7 Temperature behavior and examples Example 1 Data: Height of the room: Height of the installation: Temperature behavior Temperature ratio ΔTxy / ΔT0 v max = v maxlu x k 1 L WA = L WAlu - k 2 p t = ptlu x k 3 VLD: k 1 = 1 k 2 = 0 k 3 = 1 H = 600 m H = 0 m (free suspended) Air flow by diffuser: V 0 =1000 m 3 /h 1 Maximum air speed at head height (18 m): v = 02 m/s 5 Required: 1 Nominal dimension of the diffuser 2 Acoustic power L WA 3 Loss of pressure Δp t 4 Minimum clearance between diffusers Solution: 1 From the Areas of application diagram we deduce DN From the Horizontal airflow diagram for DN 315 and with an airflow of 1000 m3/h, we deduce the following values: Acoustic power: 35 db (A) 3 3 Total loss of pressure: 15 Pa 4 4 For y = H 180 = 0 m 180 m = 220 m and a maximum airflow speed at head height (18 m) of 02 m/s: - Air flow distance: x + y = 3 m 6 - Minimum clearance between diffusers: 2 x (x + y - H) = 2 x (3 m - 22 m) = 16 m 7 Example 2 Data: Nominal dimension: DN Airflow: V 0 =1000 m3/h 1 Temperature difference: + 5 C 7 Required: Vertical penetration Solution: From the Vertical penetration diagram we find: 41m VLV: k 1 = 08 k 2 = 2 k 3 = 085 m ft Clearance from diffuser x or x+y 8 L WA (db(a))= Clearance from diffuser x or x+y m 10 cfm m 3 /h L WA (db(a))= ft L WA (db(a))= L WA (db(a))= Pressure loss p t Air velocity v With the influence of the ceiling, the speeds must be multiplied by factor of 14 Note: The room s absorption has not been considered m/s ft/m Pa In of water max Example

8 DN 250 Vertical penetration depth Vertical penetration depth ymax m3/h cfm Air flow V 0 Temperature difference T 0 C F VLD / VLV Performance diagrams Vertical penetration and deviation Horizontal airflow, Vertical airflow deviation in cooling mode m3/h cfm Horizontal clearance from diffuser x ft m C F Temperature difference T 0 m ft Vertical deflection y See example 2 on page 5 DN 315 Depth of vertical penetration Vertical penetration depth ymax Temperature difference T 0 C F 8 Example 2 m3/h cfm Horizontal airflow, Vertical airflow deviation in cooling mode m3/h cfm Horizontal clearance from diffuser x ft m C F Temperature difference T 0 m ft Vertical deflection y 6

9 DN 0 Depth of vertical penetration Vertical penetration depth ymax m3/h Temperature difference T 0 C F cfm Air flowv VLD / VLV Performance diagrams Vertical penetration and deviation Horizontal airflow, Vertical airflow deviation in cooling mode m3/h cfm Horizontal clearance from diffuser x ft m C F Temperature difference T 0 m ft Vertical deflection y DN 500 Depth of vertical penetration Vertical penetration depth ymax m3/h cfm Temperature difference T 0 C F Horizontal airflow, Vertical airflow deviation in cooling mode m3/h cfm Horizontal clearance from diffuser x ft m C F Temperature difference T 0 m ft Vertical deflection y 7

10 Dimensions and installation Dimensions Installation sample DN 250 mm in /4 Ø / Mounting in free suspension installation with connecting to folded spiral-seam tubing Manual setting with cables Mounting in free suspension with a connection elbow 90 Setting with locker Ø /8 DN 315 Ø / / Ø /8 Ø / / Ø 602 3/4 Ø / DN /4 Mounting below a sub-ceiling Example with motorized adjustment Mounting in free suspension Example with control cable and deviation pulley (not supplied) DN /4 Ø /8 8

11 Specifications 1 - Description and physical characteristics 11 The air diffuser with adjustable jets shall be made of steel and aluminum It shall have adjustable blades guiding the air flow 12 The diffuser shall consist of a large hole in the outer wall or perforated wall 13 Blade adjustment shall be done manually, by cables or motorized 14 The diffuser shall be available with a galvanized finish or powder coated polyester-based TGIC The color, according to RAL color chart, will be chosen by the architect or client 2 - Installation The diffuser shall be designed to be connected directly to an air duct without a plenum 3 - Performance The performance shall be guaranteed by using performance curves or simulation software for critical areas These curves shall indicate the pressure loss and acoustic power, and show a sectional view of the air cooling, isothermal and heating modes with a rated speed in occupied zone at 18 m above the ground or as requested by the engineer 4 - Balancing Balancing the NAD Klima VLD and VLV diffusers shall be executed by a qualified air ventilation balancing technician holding a recognized professional certification 5 - Required quality: NAD Klima, VLD model Required quality: NAD Klima, VLV model Codification VLD, VLV 250, 315, 0, 500 VLD A - XXXX C = Cable adjustment H = Hand adjustment M = Motorized adjustment XXXX = Galvanized steel 9003 = White 9010 = Cream 00SB = Solar Black (Standard matte black) 00SM = Silver Mat (Standard metallic grey) = RAL color (write the RAL color number) Product Nominal dimension Adjustment Diffuser color Example Blue: Standard Note: The VLV galvanized steel will be painted Silver Matte color (00SM) 9

12 List of s y m b odls Aand L 358b a sic c oncept wwwnadklimacom NAD Klima 144, rue Léger, Sherbrooke, QC, J1L 1L9 Canada T : F : s info@nadklimacom NAD Klima Ontario 28, Argentia Road, Unit 6, Mississauga, ON, L5N 8G4 Canada T : ontario@nadklimacom MADE IN