Air principle · jet

One jet, fifty metres.

In a large hall or auditorium the air often cannot come from the ceiling: it is too high, or there is no ceiling. Then it comes from the wall, as one concentrated jet with plenty of momentum. It reaches far, mixes with room air on the way and arrives in the occupied zone slowed down.

What the air does

Reach far, mix late.

At the outlet

A jet nozzle forms a round, free jet (DW-V2, DS 1235e p. 2). In the swivel jet outlet SW, an adjustable support jet through the core tube bends the swirling jets into one long jet (DS 1249 E p. 2).

In the room

On its way the jet entrains room air and loses velocity. A cold jet is heavier and bends downwards; a warm jet is lighter and bends upwards. That is why the angle changes with the season.

Aiming

The DW-V2 swivels through ±30° (DN 300: ±21°), and ±30° sideways via the flange. Manually, electrically, or thermostatically on the supply temperature, without auxiliary power. (DS 1235e p. 2–5, p. 16)

When to choose a jet

Where the ceiling is too far away.

Large spaces with changing use or changing loads: exhibition halls, airports and concert halls (DS 1235e p. 2).
Large halls where ceiling outlets are not possible: exhibition, sports and production halls (SW, DS 1249 E p. 2).
From a gallery or balcony: the DW-V2 also fits in a gallery parapet (DS 1235e).

When not: If the room is shallow, or people sit close to the wall, a long throw is too much. Look at the DW-V2-…-DR with twist element (throw up to approx. 17 m) or a linear whirl outlet such as the WL (linear jet up to 16 m).

Design limits

The limits per type.

Type	Throw	Max. ΔT cooling / heating	Mounting	Air volume	Source
DW-V2	up to 50 m	−8 K / +6 K	min. 2.5 m (DN 60) to 4.5 m (DN 300)	40–3,000 m³/h	DS 1235e p. 2–3, p. 15
DW-N2	up to 50 m	—	wall or parapet, fixed direction	40–2,120 m³/h	DS 1235e p. 2–3
DW-V2-…-DR	up to approx. 17 m	—	as DW-V2, with twist element	—	DS 1235e p. 2–3
SW	0.5–15 m; with ring up to 30 m (DN 600/710)	−10 K / +6 K	discharge height 4–6 m; spacing min. 3 × DN	395–10,080 m³/h	DS 1249 E p. 3, p. 8
WL	linear jet up to 16 m	−8 K / +5 to +8 K	2.6–6 m, per size	100–1,100 m³/h (WL-1 to WL-3)	DS 4029e p. 3

recommended DW-V2 angle

· cooling 10–15° upwards · heating 15–20° downwards (DS 1235e p. 3)

TB 69

Jet nozzles and linear whirl outlets produce a two-dimensional flow and fall under −8 K (p. 6). Read the maximum cooling load from fig. 8.

Peek rule of thumb

From a discharge height of about 3–3.5 m, choose an adjustable outlet, so you can direct the jet for cooling and heating. On the wall, that is a swivelling nozzle (DW-V2) or the swivel jet outlet SW; in the ceiling, an adjustable swirl diffuser: RA-V2 (DS 4122 E p. 2), DD-VG · DD-VL (DS 4033 E p. 2) or DD-VK (DS 1256 E p. 2).

heating from above

If the outlet sits in the ceiling of a high hall, the jet straightener of the DD-VG turns the warm air into a narrow vertical jet with great penetration depth, up to 28 m discharge height (DS 4033 E p. 2) → DD-VG · DD-VL

Typical mistakes

Where it goes wrong.

One fixed angle for cooling and heating. A cold jet drops into the occupied zone too early; a warm jet stays up. Let the angle follow the season: manually, electrically or thermostatically.
Too much throw for the room. The jet arrives at the far side or in the occupied zone too fast. Choose a shorter throw (DR variant) or a smaller size.
Mounted too low. Below the minimum mounting height, the jet comes too close to people (DW-V2: 2.5 to 4.5 m, depending on size).
Too close together. The SW needs a spacing of at least 3 × DN (DS 1249 E p. 3).
Too large a temperature difference. Beyond −8 K (DW-V2) the cold jet drops too early.

The types in the collection

Nozzles: DW-V2 · DW-N2 · DW-V2-…-DR

Swivel jet and multiplex: SW · FA-VT · FA-VT-K

Linear jet: WL

Vertical from above: DD-VG · DD-VL

All jet outlets →

Where you’ll find it

Krantz nozzles in Dutch projects, according to the old Peek website: Chassé Theater, Breda (electric DW-V2); De Nobel, Leiden (DW-V2); Kenniscluster, Arnhem (DW-V2); RDM submarine shed, Rotterdam (DW-V2). Swivel jet outlets SW: Klokgebouw, Eindhoven, and Westergasfabriek, Amsterdam.

All references →

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