Broad multiplex outlet BF-V...

Transcription

1 Air distribution systems Broad multiplex outlet BF-V... DS 40 E 04.0 Technical Selection

2 Preliminary remarks In many applications in the commercial sector, supply air is discharged via simple grilles built into a room wall near the ceiling. Air jets produced by such large-surface grilles have only a low momentum. They are prone to instability and tend above all when cooling to descend early, which causes draughts. The resultant thermal discomfort occurs frequently in many hotel rooms. Nowadays, hotel guests demand high standards. They want comfortable furnishings and fittings in the room and thermal comfort, i.e. comfortable room temperatures without draught. To meet these requirements many hotels are refurbished, renovated or redeveloped. This includes improving indoor air flow in the guest rooms. To meet this need KRANTZ KOMPONENTEN provides the broad multiplex outlet, which is ideal for replacing grilles while retaining the ventilation system to raise thermal comfort in the room substantially at low conversion costs. In the following, the broad multiplex outlet is described and its function in hotel room applications explained. Construction design and function The main components of the broad multiplex outlet (Figure and 2) are the frontal plate with built-in nozzle disks 2 and moulded frame as well as mounting frame 3. The frontal plate is fastened with a plug-in connection 4 at the mounting frame and can be detached from the room. Figure 2: Broad multiplex outlet, size 3 The supply air flows simultaneously out through the nozzle disks and the perforated metal plate. The air jets with higher momentum from the nozzle disks induce the air from the surrounding perforated metal surface and direct the total supply air flow in a prespecified direction. The individual nozzle disks are manually rotatable through 0 from the room. The supply air flow can thus be spread as broadly as required. The outer nozzle disks (to the right and left) produce a flatter air jet than the inner disks, which enables a broader spread of total supply air flow. This is advantageous with asymmetrical air outlet placement in 3. to m wide rooms. This installation option is frequently chosen in hotel rooms. With an appropriate adjustment of the nozzle disks the supply air can be distributed over the entire room width (Figure 3 and ). L N L A 9 HN HA Wall cutout [(L K + ) x 24] above L K ø 4 Key for all pages: Frontal plate with frame 2 Nozzle disks 3 Mounting frame 4 Plug-in connection Wall mounting (on site) 6 Installation instruction Wall 8 Fan coil or similar 9 Adapter (on site) DS 40 E Bl Figure : Broad multiplex outlet, dimensions 4 2

3 8 Air outlet placement right, measurement height. m m 4 m m m Air outlet placement centric, measurement height. m Figure 3: Basic jet pattern with air outlet installation near the right wall (in flow direction) of a hotel room The air velocities and temperatures in a hotel room, with asymmetrical and symmetrical installation layout of the air outlet are illustrated in Figure 4 and apply for cooling. For the most part, indoor air velocities are below 0.2 and most are even 0.. The indoor air temperature is distributed evenly; at maximum deviation from the mean value it is smaller ± K m Figure 4: Example of indoor air velocities and temperatures in a hotel room; air outlet volume flow rate V. = 0 l/s [00 m 3 /h] Temperature difference supply air indoor air DJ = 8 K m m m 4 m DS 40 E Bl Selection and layout The broad multiplex outlet is available in 3 sizes with the same height but various lengths. Sometimes clients wish to have air outlets of the same length in rooms with various air volume flow rates. For such cases the individual sizes are available with graded volume flow rate ranges (see table). The minimum installation height up to the bottom edge of the air outlet amounts to 2.2 m, the minimum distance to the ceiling (from the upper edge), 0 mm. Volume flow rate range Size V. range V. range l/s m 3 /h Maximum temperature difference between supply air and indoor air: 0 K when cooling; + 0 K when heating Figure : Jet dispersion made visible with smoke tracer; air outlet placement as in Figure 3 Nozzle disks Dimensions Nominal Active Arrange- No. ment ) length L K length L N height H N length L A height H A mm mm mm mm mm Weight 2 2-row row row ) Single-row arrangement of nozzle disks on request G kg 3

4 4 Total pressure loss pt in Pa Total pressure loss pt in Pa p t Size: Size: L WA l/s Air outlet volume flow rate V A Sound power level LWA in db(a) ref. 0-2 W 40 m 3 /h l/s 2 Layout example p t Size: 3. Size: L WA Air outlet volume flow rate V A 40 Sound power level LWA in db(a) ref. 0-2 W m 3 /h Broad multiplex outlet for: Volume flow rate V. = l/s [0 m 3 /h] Maximum sound power level L WA = db(a) Maximum length = 0 mm a) Selected: Size 2.4 from graph and table on page 3 L WA = db(a) Dp t = 3 Pa Length L N = 60 mm b) Selected: size 3.4 ) from graph 2 and table on page 3 L WA = db(a) Dp t = 3 Pa Length LN = 940 mm ) When air outlets of uniform length are selected for different sizes of hotel rooms or air volume flow rates for visual reasons, for example Sound power level and pressure loss The maximum sound power level for the different sizes amounts to db(a) and maximum pressure loss is 6 Pa, see graph and table. The maximum sound pressure level in the hotel room, measured at a distance of. m from the air outlet, is db(a). Size Air outlet volume flow rate Sound power level L W in db ref. 0-2 W V. A L WA Octave band centre frequencies in Hz l/s m 3 /h db(a) 0 00 K 2 K 4 K Features Sidewall air outlet with perforated frontal plate and double-row, built-in nozzle disks Spread of supply air jet as desired through manual rotation of individual nozzle disks up to 0 For symmetrical or asymmetrical air outlet placement in a room wall For new buildings and ideal for replacing simple grilles when refurbishing old buildings Maximum volume flow rate 0 l/s [00 m 3 /h] Low indoor air velocities: at head height of seated person maximum 0.2, mostly 0. Maximum temperature difference between supply air and indoor air ±0 K Maximum sound power level db(a) ref. 0-2 W Sound pressure level db(a) ref Pa at. m distance from air outlet Maximum total pressure loss 6 Pa Minimum installation height 2.2 m Minimum distance to ceiling 0 mm Available in 3 sizes with graded volume flow rates DS 40 Bl

5 Type code BF-V Broad multiplex outlet Size Surface finish Colour of discharge element Placement in room Surface finish 900 = Face painted to RAL900, semi-matt ) Colour of discharge element S = black similar to RAL 900 W = white similar to RAL 900 Placement in room 2) L = to the left M = in the middle R = to the right Size. = Size..2 = Size = Size = Size = Size = Size = Size = Size = Size 3. DS 40 Bl Tender text... units Broad multiplex outlet for flush mounting in the upper segment of the room wall, for a spread and stable supply air jet, consisting of: perforated frontal plate with built-in 2-part nozzle disks. Each nozzle disk is manually rotatable through 0 and produces supply air jets having a far higher momentum than those discharged by the surrounding perforated plate. This enables to spread the whole supply air stream as broadly as required, which results in rapid reduction of jet velocity and temperature difference to indoor air. mounting frame for easy installation and for fastening the frontal plate with plug-in connection. Material: 2-part nozzle disk Disk made of polycarbonate PC-GF-0-V0, bodytinted in pure white similar to RAL 900 or pitch-black similar to RAL 900 Disk support made of acrylonitrile-butadienestyrene ABS-V0, body-tinted in pitch-black similar to RAL 900 Frontal plate and mounting frame made of galvanized sheet metal, visible part of frontal plate painted to RAL 900, pure white ) Make: Type: ) Other colours on request 2) Broad multiplex outlet seen from room KRANTZ KOMPONENTEN BF-V Subject to technical alterations.

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