Floor displacement diffuser with trafficable bar grille.

	Location – below: Air supply from the floor.
	Displacement discharge: Thermal displacement airflow, with low velocity, low turbulence supply from the diffuser face into the occupancy microclimate. Heat and contaminants rise by natural convection to stratify at a high level. Enhanced levels of indoor air quality are attained in the breathing zone.
	VAV dependent throw: Suitable for VAV applications. Horizontal coverage dependent upon airflow rate.
	Rectangular face shape: Nominal width: 100 mm, 200 mm or 300 mm. Nominal length: 1000 mm or 2000 mm. Bespoke sizes available on request.
	Slotted face pattern: Bar grille with trafficable slats.
	Metal Face: Anodised or powder coated aluminium slats.

Options

Adjustable direction: Rotatable hexagonal elements, manually adjustable by Allen key through the diffuser face, allow airstream to be concentrated or spread, and to be inclined.

SMARTEMP Bar Displacement Diffuser BDF-FD

Airflow rate

• ≤ 90 L/(s·m) [324 m³/(h·m)]

Temperature differential

• -1 to -6 K for supply to 1.1 m height
•  ΔTsupply-return ≈ -1 K to -12 K, depending on room height and airflow rate

Length

• 1000 mm / 2000 mm / bespoke on request

Width

• 100 / 200 / 300 mm

Height

• 70 – 80 mm

Features

• Thermal displacement airflow
• For installation in raised floors
• Low velocity discharge for draught-free indoor air flow
• Large supply air coverage (up to 7 m from diffuser)
• Optional manual discharge direction adjustment with high mixing at diffuser face

Function

The SMARTEMP Bar Displacement Diffuser, type BDF-FD, produces low velocity, low momentum displacement airflow that spreads horizontally across the floor. A perforated fixed damper, located behind the trafficable linear bar grille, produces uniform airflow with low turbulence discharge across the diffuser face. The optional inclusion of rotatable hexagonal discharge elements (version BDF-AD), manually adjustable through the diffuser face, directs the discharged air upwards with strong mixing, breaking down discharge velocity and inducing warmer room air into the supply airstream, thereby allowing a lower supply air temperature to be used to cover larger loads, such as along facades. The airstream may be spread or concentrated, and may be inclined, before falling down gently to flood the floor with a cool lake of the high quality supply air. A low level occupancy microclimate of enhanced indoor air quality is achieved, in which thermals from heat sources such as occupants, equipment and lights rise upwards in convective plumes, drawing in high quality replenishment air from the fresh air lake, to envelop heat sources, such as occupants, in a micro-climate of cool, high quality air. Heat and contaminants stratify at a high level in concentrated form to be removed from the space.

Due to stratification of heat, relatively large supply-to-return temperature differentials are achievable – dependent on ceiling height – despite the relatively high supply air temperature (typically 20°C), thereby minimising fan energy requirements. Energy savings also accrue from the extended free cooling range often achieved by the elevated supply air temperature, as well as from the potential to reduce outdoor airflow rates due to the the improved ventilation effectiveness of the low level displacement supply.