Air principle · induction

A thin jet takes the room along.

Air leaving a narrow opening at speed draws in the air around it. That is induction. An induction diffuser uses dozens of small jets at once; a chilled beam uses it to pull room air through a heat exchanger. A little supply air sets a lot of room air in motion.

See it in motion: the airflow of the IN-V →

What the air does

Many jets, one mixture.

Induction diffuser

A row of rotatable elements, each with two jet channels, forms many single jets with high induction. You set the direction per element: two-way, one-way or closed. (IN-V, DS 4082e p. 2–3, p. 14) In the IN-N6 the channels are fixed at 45°, alternately left and right. (DS 1125 E p. 2)

Wall outlet

In the BF-V, rotatable nozzle discs produce thin jets that carry along the gentle air from the perforated face plate. The result is a wide, stable fan of air. (DS 4101 E p. 2)

Active chilled beam

Primary air from nozzles pulls room air through the heat exchanger. The mixture is cooled or heated and flows horizontally along the ceiling into the room. (DK-LIG/Z, DS 4108 E)

Chilled sail with induction unit

In AVACS, the induction unit discharges about 70 % of the air above the panel and 30 % below it. (DS 4170 E p. 2)

When to choose induction

Discreet, yet powerful.

A slim line in the ceiling. The IN-V3 is 15 mm wide per row and disappears into the ceiling (DS 4082e p. 2, p. 13).
Direction per zone. Because every element is set individually, one linear diffuser can serve façade, corridor and workstation.
Water carries the load. In a chilled beam or façade unit, water removes most of the cooling load. The primary air is then mainly for ventilation and induction.
Highly glazed façades. Induction units in the floor or the parapet discharge in front of the glass (IG-M-LB DS 4137 E p. 2; IG-M-SB DS 4139 E p. 2).

When not: Above 7 m, even the IN-N6 is out of range. Look at adjustable swirl diffusers →.

Design limits

The limits per type.

Type	Kind	Discharge height	Max. ΔT cooling / heating	Air volume	Source
IN-V (IN-V2)	linear induction diffuser, adjustable	2.7–5 m	−10 K / +6 K	40–400 m³/(h·m)	DS 4082e p. 2, p. 13
IN-V (IN-V3)	same, 15 mm	2.5–3.5 m	−10 K / +6 K	11–61 m³/(h·m)	DS 4082e p. 2, p. 13
IN-N6	linear induction diffuser, fixed direction	4–7 m	−10 K / +6 K	100–300 m³/(h·m)	DS 1125 E p. 2, p. 6
BF-V	broad wall outlet	mounting 2.2–4.0 m	−10 K / +10 K	79–540 m³/h	DS 4101 E p. 3–4, p. 7
DK-LIG/Z	active chilled beam, two-way	—	air −8 K at the stated capacities	15–90 m³/(h·m) primary	DS 4108 E p. 5

TB 69

Active chilled beams produce a two-dimensional flow and fall under a maximum of −8 K (p. 5). For the maximum cooling load, fig. 8 applies instead of fig. 7 (p. 6).

BF-V reach

Approx. 6 m deep and approx. 4 m wide (DS 4101 E p. 4).

DK-LIG/Z in the occupied zone

At 40 m³/(h·m) primary air, 0.14–0.18 m/s at most, with a gradient of 1 K/m up to 3.5 m ceiling height (DS 4108 E p. 4).

Typical mistakes

Where it goes wrong.

The wrong type for the height. The IN-V2 is made for 2.7 to 5 m. Higher up, the IN-N6 (4–7 m) belongs there.
Heating without low-level extract. When heating with the IN-N6, about half the return air should be extracted in the floor zone (DS 1125 E p. 6). Otherwise the warm air stays up.
Treating a chilled beam like a ceiling diffuser. An active chilled beam discharges two-dimensionally and is limited to −8 K (TB 69 p. 5).
A passive chilled beam above a fixed workstation. The DK-F has no primary air: cooled air falls straight down. The datasheet rules out fixed workstations beneath it (DS 4091 E p. 2).

The types in the collection

Linear diffusers: IN-V · IN-N6 · IN-V XTRA

Wall: BF-V

Chilled beams: DK-LIG/Z · DK-LIG/E · DK-LIG-EW · DK-LIO-TV

Façade and floor: IG-M-LB · IG-M-SB · IG-Q-SB (induction with displacement)

Chilled sail with induction: AVACS

All induction products →

Where you’ll find it

Krantz induction diffusers in Dutch projects, according to the old Peek website: De Nobel, Leiden (IN-V2); Shell, Rijswijk (IN-V); SNS Reaal, Utrecht (IN-V2); Slotervaart Hospital, Amsterdam (IN-V2 in a plastered ceiling).

All references →

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