NPA NPA AL NPA PLENUM FAN NPA PLENUM FAN AL UNPARALLELED - PowerPoint PPT Presentation

The New COMEFRI COMEFRI Plenum Wheel: NPA NPA AL

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UNPARALLELED FLEXIBILITY: - DIFFERENT MOTOR SIZES ON THE SAME FRAME DIFFERENT MOTOR SIZES ON THE SAME FRAME - ONE STRUCTURE FOR THREE IMPELLER TYPES NPA NPL A WELDED STRUCTURE TO A WELDED STRUCTURE TO ACHIEVE VERY LOW VIBRATION LEVELS AS DEMANDED BY THE TE RELEVANT ISO STANDARDS .

NPA PLENUM FAN NPA PLENUM FAN AL

NPA PLENUM FAN NPA PLENUM FAN AL

NPA PLENUM FAN NPA PLENUM FAN AL

NPA PLENUM FAN NPA PLENUM FAN AL

NPA PLENUM FAN NPA PLENUM FAN AL

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NPA PLENUM FAN NPA PLENUM FAN Wheel Performance . @ 1500 rpm 2 000 1 500 e [Pa] Static Pressure 1 000 NPA 710 500 NPL 710 0 0 5�000 10�000 15�000 20�000 25�000 30�000 35�000 40�000 Air Volume [m3/h] AL

NPA PLENUM FAN NPA PLENUM FAN Wheel Performance . @ 1500 rpm 100 90 90 80 cy % Static efficien 70 60 NPA 710 50 NPL 710 40 0 5�000 10�000 15�000 20�000 25�000 30�000 35�000 Air Volume [m3/h] AL

NPA PLENUM FANS NPA PLENUM FANS The new NPA wheel is therefore capable of delivering higher air volumes than the delivering higher air volumes than the corresponding size NPL fan, whilst maintaining very high efficiency levels In turn significant very high efficiency levels. In turn, significant improvements are obtained in acoustic performance through the utilisation of Airfoil performance, through the utilisation of Airfoil blades. NPA is therefore a perfect choice for NPA is therefore a perfect choice for acoustically sensitive projects. AL

NPA PLENUM FANS NPA PLENUM FANS F Focusing on this aspect, let’s now consider a i thi t l t’ id typical Air Handling Unit manufacturer’s requirement: i t - Delivered air volume: 20,000 m3/h D li d i l 20 000 3/h - Static pressure : 1400 Pa Static pressure : 1400 Pa - Air temperature: 20 °C AL

NPA PLENUM FAN NPA PLENUM FAN 2 000 Requested performance: V = 20000 m3/h P = 1400 Pa st. P 1400 Pa st. 1 500 [Pa] Static Pressure 1 000 500 NPA 710 @1437 rpm NPL 710 @ 1494 rpm 0 0 5�000 10�000 15�000 20�000 25�000 30�000 35�000 40�000 Delivered Air Volume [m3/h] AL

NPA PLENUM FAN NPA PLENUM FAN Requested Performance: V = 20.000 m3/h 100 P = 1400 Pa st. 90 80 70 y % 60 60 Static efficiency 50 40 NPA 710 @ 1437 rpm 30 NPL 710 @ 1494 rpm 20 10 0 0 5�000 10�000 15�000 20�000 25�000 30�000 35�000 Delivered Air Volume [m3/h] AL

NPA PLENUM FAN NPA PLENUM FAN Required performance: 102 V = 20.000 m3/h P = 1400 Pa st. 100 100 utlet [ dB(A)] 98 Power level at Ou 96 94 Sound P 92 NPA 710 @ 1437 rpm 90 NPL 710 @ 1494 rpm 88 0 5�000 10�000 15�000 20�000 25�000 30�000 35�000 40�000 Delivered Air Volume [cmh] AL

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NPA PLENUM FANS NPA PLENUM FANS Fan Efficiency (continued) Fan Efficiency (continued) Between a small (250 mm) and a larger (1400 mm) diameter impeller, the results show differences of up to 6 - 8 points in maximum efficiency. The same impeller, when running at maximum allowable speed and when running at 33% of max speed, can show p g p , differences of up to 4 points on the measured efficiency. These two effects combined, can result in over 10 points difference. AL

NPA PLENUM FANS NPA PLENUM FANS Fan Efficiency (continued) Fan Efficiency (continued) Other manufacturers tend to declare the same level of Oth f t t d t d l th l l f efficiency on their complete fan range and choose to say nothing about the relationship between size, efficiency nothing about the relationship between size, efficiency and speed. AL

NPA PLENUM FANS NPA PLENUM FANS DIN 24 166 standard has the following maximum deviations, for DIN 24 166 d d h h f ll i i d i i f each “class of tolerance”: Parameter Parameter Limit of deviation for: Limit of deviation for: Class 1 Class 2 Volume flow rate, V +/- 2,5 % +/- 5 % Pressure increase, � p +/- 2,5 % +/- 5 % Power, P + 3 % + 8 % Efficiency Efficiency , � - 2 % 2 % - 5 % 5 % � Sound Power Level , Lw (A-weighted) + 3 dB + 4 dB All published COMEFRI performance data are in line with Class 1 tolerance. AL

NPA PLENUM FANS NPA PLENUM FANS Noise Noise Another important aspect is the published fan noise data. The majority of fan noise is generated by the wheel and its main contributory factor is the ‘blade tone’, or ‘tonal noise’, at a well defined spectrum position (the so-called “blade passing frequency”). fi i i ( “ i f ”) Blade passing frequency = (z x n)/60 Where : z = number of blades n = wheel revolutions per minute n wheel revolutions, per minute AL

NPA PLENUM FANS NPA PLENUM FANS Noise (continued) ( ) Therefore, it is absolutely vital that tonal noise be Th f it i b l t l it l th t t l i b considered to enable an accurate calculation of th the ambient noise level !! bi t i l l !! AL

NPA PLENUM FANS NPA PLENUM FANS Noise (continued) ( ) This graph represents the difference between octave band spectrums, with and without Tonal Noise, ba d spect u s, w t a d w t out o a No se, calculated for a blade tone of 250 Hz: 105 105 105 105 Octave band Values 102 4 dB of 100 [dB] 100 100 difference on the 95 95 total value, 93 90 90 more than twice th t i Total 90 88 90 98 Noise 93 the level !!! 93 85 84 value [dB] 90 85 85 88 81 84 85 80 80 77 81 81 75 75 77 Without Tonal Noise 70 70 With Tonal Noise 63 125 250 500 1000 2000 4000 8000 {Hz] {Hz] AL

NPA PLENUM FANS NPA PLENUM FANS Noise (continued) Some manufacturers, however, publish their sound data without the tonal noise included. This approach is misleading, so that other manufacturers often prefer to clarify their published data by stating; often prefer to clarify their published data by stating; ... “without removing the blade frequency”, or “the octave band spectrum includes blade frequency”!!! COMEFRI consistently publishes the full noise levels, blade frequency included. AL

NPA PLENUM FANS NPA PLENUM FANS Choose the winner !!! AL