SAL 35 ® Catalog - NAD Klima

NAD KLimaLinear diffuserDiagramExampleExampleSpecifications:- 4 diffusers installed in a row,3 slots each: SAL 35 - 1500 - 3- Total airflow Rate: 1530 m³/h- Cooling mode: ∆T = - 15 °C- Heating mode: ∆T = + 15 °C- Width of room: 4 m- Length of room: 8 m- Height of room: 3 m- Nominal head level: 1.8 mPressure loss/acoustic power levelDrum positionCDet 521 et 65Requirements :1. Airflow rate by metre of slot2. Maximum airflow velocity in occupiedzone V max3. Critical distance in cooling modeX crit ?4. Sound power L WA ?5. Pressure drop ∆P t ?87Solution:1. For a total airflow rate of 1530 m³/hand 4 SAL35 diffusers, we note :1535 ÷ 4 = 384 m³/h per diffuserDividing by the number of slots:384 m³/h÷ 3 = 128 m³/h.Each slot of 1500 mm = 1.5 m length,Dividing then by 1.5 in order to findthe airflow rate by meter of slot :128 m³/h ÷1.5 = 85 m³/h/m 12. In the diagram on sizes, wallclearance x=2 m 2 and a criticaldistance after conjunctiony = 3 m - 1.8 m = 1.2 m, 3 we note amaximum airflow velocity in anoccupied zone of:V max = V max = 0.25 m/s 43. For cooling mode at +15°C, 5 wenote a critical distance X crit = 8.5 m. 64. In the diagram on sound power, withan airflow rate per metre of slot of 85m³/h/m, we note a sound power ofLWA diagram = 28 dB(A) 7From the values of the oppositediagram, we note the level of soundpower as:LWA = LWA diagramme + K + I =28 + 4.7 + 7.8 = 40.5 dB(A)40.5 dB(A) - 10 dB(A)= 30.5 dB(A)5. For an airflow by slot metre of85 m³/h/m, we note : ∆P t =13 Pa8Pressure loss ∆pt [Pa]Air volume flow V·[m / h/m slot]Quantity of slotk [dB]Important :The room absorption is not taken into account.For a comparison with North American values ,reduce the acoustic power of -10.1L WA[dB(A)]1 2 3 4 5 6 7 8 9 100.0 3.0 4.7 6.0 7.0 7.8 8.4 9.0 9.5 10.0How to determine the diffusion lengthDiffusers installed in parallelLenght of diffusion: 3 m3 mDiffusers installed in rowLenght of diffusion : 9 m3 m3 m3 mLenghtofdiffusion12345678910I [dB(A)]0.03.04.76.07.07.88.49.09.510.0Subject to technical changes. Version 06 / 09 / 2012 1.1.3 SAL 357