LD / LD-Q
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Variable geometry vortex circular diffuser LD / LD-Q Description Variable geometry vortex circular diffuser for ceiling installation. The mechanism integrated into the hub allows you to simultaneously adjust the angle of deflection of the deflectors and therefore the divergence of the jet: the geometry of the launch may well vary continuously from horizontal swirling with Coanda effect up to completely vertical. It is commonly used in both civil and industrial applications, because allows to obtain a effective diffusion also from significant installation heights. Availability with manual mechanism (LD) or electric (LDE), also in execution on plate 595x595 mm (LD-Q, LDE-Q : up to Dn 400). Construction Natural aluminum painted (body), painted steel (deflectors). Finish White RAL 9010 gloss, powder-coated polyester. Accessories PLS-LD : standard plenum with perforated equalizer. PLSS-LD : as PLS-LD but with damper.* PLI-LD : isolated** plenum with perforated equalizer. PLIS-LD : as PLI-LD but with damper.* * adjustable from the environment. ** polyurethane internal isolation thickness. 6 mm, cl.1 Specifications of variable geometry Vortex circular diffuser for ceiling installation. Central adjustment of the inclination of the deflectors, manual or electric. Launch from horizontal Vortex up to vertical. Steel and aluminum painted white RAL 9010. internal diameter - ** external diameter L^a sound power level (rif. 10-12 W - a = 30°- 60°) F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - fcr@fcr.it

Variable geometry vortex circular diffuser   Key to symbols a deflection angle of the deflectors hi installation height distance between the center of the diffuser and the wall to which the jet flows temperature difference (air input - environment setpoint) pressure drop LWA A-weighted sound power level “A” (rif. 10-12 W) Notes Graduated scale and angle indicator of deflection a. The value of d was calculated in relation to X0,2 and hi to maintain residual velocity in the occupied area within the limit of 0,2 m/s In case of diffusion with Dt = -10 °C (cooling) reduce X0,2 of...

Variable geometry vortex circular diffuser LD / LD-Q Example You want to condition a room with dimensions 5x5x3,5 m. The summer specific load is 150 W/m2. - The power required for cooling will be : 5 * 5 * 150 = 3,75 kW - The total air volume assuming At = -8 °C will be : 3750 / (0,34 * 8) = 1380 m3/h - Supposing you divide the plant in 4 squares with 2.5 mt per side, you will have: q = 1380 / 4 = 345 m3/h d = 1,25 m > d = 0,9 m a = 51° (nearer to a2 because hi is nearer to h2) LwA = 32 dBA i F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy phone +39 02 61798 1 - fax +39...

Variable geometry vortex circular diffuser LD / LD-Q F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - fcr@fcr.it Example You want to heat a room with dimensions 7x7x4,5 m. The winter specific load is 200 W/m2. - the power required for heating will be : 7 * 7 * 200 = 9,8 kW - The total air volume assuming At = + 8 °C will be : 9800 / (0,34 * 8) = 3600 m3/h - Supposing you divide the plant in 4 squares with 3.5 mt per side, you will have : q = 3600 / 4 = 900 m3/h d = 1,75 m > d = 1,6 m a = 47° (nearer to a1 because...

Variable geometry vortex circular diffuser LD / LD-Q Example You want to cool a room with dimensions 6x10x5 m. The summer specific load is 190 W/m2. - The power required for cooling will be : 6 * 10 * 190 = 11,4 kW - The total air vloume assuming At = -12 °C will be : 11400 / (0,34 * 12) = 2800 m3/h - Supponging you divied the plant of the room in 2 rectangles of 6x5 m, you will have : q = 2800 / 2 = 1400 m3/h d = 2,5 m > d = 1,9 m a = 58° (nearer to a1 because hi is nearer to h1) LwA = 43 dBA i F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy phone +39 02 61798 1 - fax...

Variable geometry vortex circular diffuser LD / LD-Q F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - fcr@fcr.it Example You want to heat a room with dimensions 10x10x7 m. The winter specific load is 270 W/m2. - The power required for heating will be : 10 * 10 * 270 = 27 kW - Total air volume assuming At = + 8 °C will be : 27000 / (0,34 * 8) = 10000 m3/h - Supposing you divide the plant of the room in 4 squares of 5 mt. per side, you will have : q = 10000 / 4 = 2500 m3/h d = 2,5 m > d = 2,4 m a = 39° (average of...

Variable geometry vortex circular diffuser LD / LD-Q Mounting scheme In the case the use of the plenum is not foreseen and the diffuser is connected directly to the circular duct, it is recommended to observe the following rules: the straight inlet section must be at least one diameter, Airflow calculation Due to the uneven distribution of speeds, you should position the probe for measuring the speed of vk at 5 points equally spaced radially. You must employ hotwire anemometers taking care to position the probe as shown and orient the “window” in parallel with the exhaust flow. At each...