type purpose application linear diffuser 18mm diffuser for air distribution for false ceiling the diffuser is used for the supply and exhaust of cooled or heated air in facilities such as offices, shopping centres,... The diffuser can be mounted in the ceiling where high aesthetic standards are required. decisive elements Installed widths 18mm Completely draught-free air distribution Can be employed for temperature differences up to -14K Load variation from 100% to 20% Adjustment of flow direction no longer needed Large range of applications Insulated version Energy saving Easy to install with vektron ceiling Economical, one connection needed up to 2500mm diffuser length Type 18mm : Flow rate 20-150 m³/hm Range of sockets Ǿ 78mm and 123mm Plenum box made of aluminium. Discharge section is an aluminium extrusion principles of operation The discharge section is perforated so that air enters the room through numerous fine, individual jets, each approximately 3mm in cross section. These jets are mainly directed 45 into the room, a smaller proportion of the jets discharges vertically downwards to stabilise the flow and fill the centre of the flow pattern with air. High induction, with the associated rapid reduction in airstream temperature, is a further positive feature of the diffuser concept. It drastically reduces the dependence of airflow patterns within a room on supply-air temperature and room height. With this induction diffuser, draught free air supply can be achieved at air exchange rates up to 12/h or with a supply-air temperature difference of down to -14K (supply-air temperature average room temperature) M mailbox@
thermal insulation With non-insulated plenum boxes, there is a considerable loss of energy. For this reason the system is supplied with air chamber insulation which drastically reduces the loss in energy. Diagram: specific supply air heating in the case of non-insulated and insulated supply air diffusers (1500mm long, 1 connection socket) M mailbox@ Supply air volume flow 50m³/hm = 75m³/h
lay-out guide our recommendations Try to achieve a parallel spacing of diffusers with B 2,5m for a room height of ca. 3m Aim for a uniform arrangement of diffusers in the room M mailbox@ Arrange diffusers at right angles to the façade Dimension A: perpendicular distance to façade is not critical, can be zero. Dimension B: parallel spacing of diffusers ¼ of room height Dimension C: parallel distance from walls 1,0m. For smaller values, the specific supply-air volume must be reduced.
ventilation and acoustic design model vk180 (18mm) ventilation design M mailbox@ The room air velocities are given for Δt = -12K. For Δt = -14K, the air velocities increase by appr. 0,03m/s. According to DIN 1946 part 2 the maximum room-air velocity for a sedentary activity should not exceed 0,17 m/s (at a room temperature of 24 C). for light operations when standing when standing, the room-air velocity limit can de increased by 0,04m/s to 0,21m/s due to the higher degree of activity.
ventilation and acoustic design model vk180 (18mm) acoustic design valid for sockets Ø 78mm valid for sockets Ø 123mm room height H R = 3,0m room height H R = 3,0m reverberation time T N = 0,6s reverberation time T N = 0,6s M mailbox@ correction for L 2 for other reverberation times T N T N [s] 0,4 0,5 0,6 0,7 0,8 0,9 1,0 1,2 L 2 [db(a)] -1,8 0,8 0,0 +0,7 +1,2 +1,8 +2,2 +3,0
pressure losses Pressure losses (ΔP) can be calculated by below formula: ΔP = (V spec )²/K (Pa) V spec = volumetric flow K = factor dimensions For 18-80 K= 185 for supply air K= 174 for extract air For 18-125 K= 410 for supply air K= 328 for extract air M mailbox@ Enlarging the visual effect of the diffuser profile over the complete width of the room can be done by using a dummy profile