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.
