Products

Linear Multistream Ceiling Diffuser

Smartemp LMC-AD

High induction linear ceiling slot diffuser with alternating multi-stream mini-jets discharged by nozzle barrels. Nozzle barrel discharge direction is individually adjustable through 90° to alter air pattern from horizontal through diagonal to vertical.

The SMARTEMP Linear Multistream Ceiling Diffuser, type LMC-AD, is a multi-nozzle linear slot diffuser with adjustable discharge direction that can be flush mounted in a ceiling or freely suspended (ie no Coanda attachment to the ceiling required).

The diffuser’s 1-to-6 linear slots house a plurality of barrel nozzles, each with an adjustable guide vane, delivering highly inductive discharge by breaking the supply air stream up into a multitude of alternating air jets. Each barrel nozzle is made of black polycarbonate located between linear aluminium extrusions that are anodised or powder coated. Each guide vane is readily adjustable to any one of five discharge patterns to change the discharge angle from horizontal through diagonal to vertical. Two-way discharge is standard; one-way discharge is available as an option.

Intense mixing at the diffuser discharge face produces high induction that strongly dilutes the supply air stream with large quantities of room air. Rapid temperature equalisation of the supply air stream with room air occurs, preventing cold air dumping, thereby ensuring uniform temperature distribution (no cold and draughty or hot and stagnant spots) and high comfort levels in the space. Heating performance is also improved.

The stable discharge characteristics of the diffuser over a wide range of supply air temperatures and volume flow rates make the LMC-AD suitable both for constant flow and VAV systems, including low temperature air supply.

Available with 1-way or 2-way blow patterns. Suitable for low temperature supply air (≥ 5°C) and CAV or VAV systems with extended turndown. Installation flush with ceiling or free-hanging.

 

Mixed flow discharge:
High induction alternating multi-stream mini-jet discharge from adjustable barrel nozzles located in linear slots intensely mixes supply air with room air. Strong supply air dilution with rapid discharge velocity decay produces draught-free, high momentum supply air motion with uniform temperature distribution over short or long throws. Ideal for enhanced thermal comfort (ADPI ≥ 90%).

Return air:
Also suitable for use as a return air inlet.

Ceiling location:
Integrated flush with a closed ceiling or freely suspended. 1-way blow discharge pattern (adjustable through 90° – horizontal, diagonal, vertical) or 2-way blow discharge pattern (each direction adjustable through 90° – horizontal, diagonal, vertical).

Low temperature supply:
May be used for low temperature (cold air) supply systems (Tsupply ≤ 10 °C), where ∆Tsupply-room ≥ -16 K.

VAV dependent throw:
VAV throw dependent upon airflow rate. Minimum airflow dependent upon ∆Tsupply-room (eg turndown to 25% and ≈1 L/s/m2 @ ∆Tsupply-room ≈ -16 K).

Adjustable direction:
Air pattern adjustment, from horizontal through diagonal to vertical, via individual barrel discharge rotation through 90° Horizontal discharge provides draught-free cooling; vertical discharge provides effective heating.

Manual adjustment:
Airflow direction adjustment is manual. Linear face shape: Aluminium extrusions provide continuous linear aesthetic, with or without side and end flanges.

Slot face pattern:
Barrel nozzles create linear slot appearance.

Plastic Face:
Adjustable black plastic barrel nozzles.

Metal Face:
Anodised or powder coated linear aluminium profiles.

Airflow rate 

  • 6 – 228 L/s/m (22 – 821 m³/h/m)

Nominal length

  • 1200 mm neck
  • 1195 mm face
  • Other lengths and joining strips available on request
  • Available with or without side/end flanges

Element width

  • Flangeless: n x 28 + 3 mm, where n = number of rows (1 to 6 rows)
  • Flanged: n x 28 + 20 mm, where n = number of rows (1 to 6 rows)

Discharge height

  • 2.4 – 4.5 m

Features

  • 1 – 6 slot configurations
  • 1 or 2 way discharge patterns
  • Adjustable horizontal, diagonal or vertical discharge direction
  • High induction alternating mini-jet discharge
  • Barrel nozzles individually adjustable through 90°
  • Barrel nozzles of plastic, black
  • Side and end profiles of aluminium, natural anodised or powder coated
  • Flanged or flangeless side and end profiles
  • Installation flush with ceiling or free hanging

Function

The SMARTEMP Linear Multistream Ceiling Diffuser, type LMC-AD, is a high induction linear slot diffuser. A multitude of barrel nozzles produce alternating mini-jet discharge. The discharge direction of each barrel nozzle is individually adjustable, providing accurate air pattern adjustment. The diffuser is available with 1-way (adjustable through 90° for horizontal through diagonal to vertical discharge) or 2-way discharge patterns (each direction adjustable through 90° for horizontal through diagonal to vertical discharge).

The diffuser may be flush mounted in a ceiling or freely suspended (ie no Coanda attachment to the ceiling required). The diffuser’s 1 to 6-row linear slots (greater slot numbers available on request) comprise a multitude of nozzles with manually adjustable discharge direction adjustment to produce high induction discharge by breaking up the supply air stream into many miniature jets.  The barrel nozzles are made of polycarbonate, dyed black, and are located in aluminium extrusions that are anodised or powder coated.

High induction discharge offers many advantages. High aspiration causes intense mixing at the diffuser discharge face, strongly diluting the supply air stream with large quantities of room air. High induction, additionally, rapidly equalises the supply air stream temperature with room air, preventing cold air dumping. Rapid supply-to-room air temperature equalisation also improves heating performance by preventing the supply air from being too bouyant. High induction airflow is characterised by uniform temperature distribution and high comfort levels in the space. High induction also produces a strong increase in supply air stream mass flow rate, as well as rapid discharge velocity decay. At any given airflow rate, the SMARTEMP LMC-AD diffuser is suitable both for long throws (due to the supply air stream’s high momentum) as well as short throws (due to the supply air stream’s low velocity).

The SMARTEMP LMC-AD diffuser may be used in CAV systems, as well as VAV systems, including low-temperature supply air systems with ΔTsupply-room ≥ -16 K. VAV system turndown is dependent upon ΔTsupply-room (eg to 25% at ΔTsupply-room = -16 K). Due to high induction mini-jet discharge, the effective air changes per hour in the space are increased, allowing minimum specific airflow rates as low as approximately 1 L/s/m2 when the diffuser is fully turned down, whilst maintaining enhanced comfort of 90% ADPI. Due to the rapid discharge decay characteristics of the micro-jet discharge, a high maximum specific airflow rate of 15 L/s/m2 may be achieved at 90% ADPI.

Plenums:
Side-entry connection boxes with concealed diffuser fastenings.

Product Type

,

Adjustment

Airflow Direction

Face Material

,

Face Pattern

Face Shape

Location

Supply Temperature

VAV

Brands

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