High pressure in-line mixed-flow fans VAR
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High pressure in-line mixed-flow fans VAR - 1

The VAR-system fills the gap between axial-low pressure and high pressure centrifugal fans. The in-line airflow improves the efficiency of the total system and offers a considerable reduction of the required installation space and ducting compared to conventional solutions. The effect: .. A wider range of applications. .. Increases options at design stage. .. Complicated ducting, bends etc. and associated pressure drop are reduced to a minimum, compared to centrifugal fans. .. Lower installation cost. .. Energy conservation. .. Smaller size than axial fans for a similar duty. Volume v’s pressure in comparison to conventional axial and centrifugal fans. The example (fan with ø 400 mm, R.P.M. 2800 min-1) shows the benefits of the RADAX® VAR systems in both volume and pressure. VAR technology in comparison Comparison of the required space Conventional centrifugal fan Helios RADAX® VAR-system Air flow volume 3000 Pressure 2500 2000 1500 1000 500 0 Z-VAR P-VAR VAR Axial fans Centrifugal 104 Non s t a l l i n g i n - l i n e high pressure fans VAR

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High pressure in-line mixed-flow fans VAR - 2

The Helios strategy of developing practical solutions to customers applications has resulted in many exciting fan designs. The RADAX® VAR-system is one of the best examples, being highly respected and well received in the market. The success of the VAR-high pressure fans is in the combination of the pressure characteristics of centrifugal fans with axial air flow. The benefits are: – Maximum power at minimal energy costs. – Low sound levels. – High pressure and airflow with smaller dimensions. The following ranges for various applications are available: Single stage unit VAR – Sizes 225 to...

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High pressure in-line mixed-flow fans VAR - 3

Rack and Flight Dishwasher see manufacturers literature 58 Induction Hob, Ceramic Stove — 0.10 30 Refrigeration Unit see manufacturers literature Design of commercial kitchen canopy systems 106 Introduction Whilst systems extracting from equipment producing effluent, such as dust, depend upon air streams of sufficient velocity being created to enable capture to take place, this concept cannot be applied to a heat producing process such as cooking. All cooking processes create approximately 35% radiant and 65% convected heat which, in the absence of cross-draughts, rises vertically in a...

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High pressure in-line mixed-flow fans VAR - 4

107 Design of commercial kitchen canopy systems The fan powered system provides a option because the lack of control with a infiltration may create the following problems: Unfiltered air will enter the kitchen. Air could be drawn from dirty areas. Uncontrolled air movement may affect the cooking process. Make-Up Air In order for the kitchen extract system to function correctly, it is essential that an allowance is made for the provision of replacement air. This can be achieved either by introducing mechanically supplied air, or by making provision for natural infiltration. Where mechanical...

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High pressure in-line mixed-flow fans VAR - 5

High pressure in-line mixed-flow fans RADAX® VAR General information 108 These pages provide some additional information to complete the general technical information in the front of the catalogue. Features RADAX® VAR is a range of high pressure cased fans combining the advantages of axial and centrifugal fans. The mixed flow impeller combined with the fixed guide vanes are designed to provide high air flows and pressure very efficiently. Air flow The axial air flow pattern allows operation without loss, guide vanes improve and straighten the air and increase the efficiency of the fan. The...

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High pressure in-line mixed-flow fans VAR - 7

225 mm ø High pressure in-line mixed-flow RADAX® VAR 110 Information Pages Technical description 108 Selection chart 109 Design of systems 12-16 Special designs Alternative voltages, frequencies, protection classes, high temperatures, acid protection etc. are available on request. For safety and correct use note the technical information on pages 17-19. Speed control For all speed controllable models the current is given in the ‘speed controlled’ column of the table below which must be used when selecting a controller. If a controller not shown in the table below is selected, the maximum...

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High pressure in-line mixed-flow fans VAR - 8

111 High pressure in-line mixed-flow RADAX® VAR 225 mm ø Frequency Hz Total 125 250 500 1k 2k 4k 8k LWA Air noise dB(A) 81 51 62 74 76 76 72 63 LPA,4m Air noise dB(A) 61 31 42 54 56 56 52 43 V · m3/h ñ = 1.20 kg/m3 c m/s ptot pstat. Äptot Äpstat. Pa Frequency Hz Total 125 250 500 1k 2k 4k 8k LWA Air noise dB(A) 66 41 55 60 62 59 52 43 LPA,4m Air noise dB(A) 46 21 35 40 42 39 32 23 V · m3/h ñ = 1.20 kg/m3 c m/s ptot pstat. Äptot Äpstat. Pa Frequency Hz Total 125 250 500 1k 2k 4k 8k LWA Air noise dB(A) 49 33 40 45 44 39 31 24 LPA,4m Air noise dB(A) 29 13 20 25 24 19 11 4 V · m3/h ñ = 1.20...

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High pressure in-line mixed-flow fans VAR - 9

250 mm ø High pressure in-line mixed-flow RADAX® VAR 112 Speed control For all speed controllable models the current is given in the ‘speed controlled’ column of the table below which must be used when selecting a controller. If a controller not shown in the table below is selected, the maximum temperature (controlled) must be reduced by a further 10 °C. If the fan is to be controlled by a frequency inverter this must be stated when ordering. Explosion proof fans are not controllable. Electrical connection Terminal box fitted externally on the casing as standard (IP 55). Installation...

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High pressure in-line mixed-flow fans VAR - 10

113 High pressure in-line mixed-flow RADAX® VAR 250 mm ø Frequency Hz Total 125 250 500 1k 2k 4k 8k LWA Air noise dB(A) 84 55 65 77 79 80 75 67 LPA,4m Air noise dB(A) 64 35 45 57 59 60 55 47 V · m3/h ñ = 1.20 kg/m3 c m/s ptot pstat. Äptot Äpstat. Pa Frequency Hz Total 125 250 500 1k 2k 4k 8k LWA Air noise dB(A) 69 44 58 63 65 63 56 46 LPA,4m Air noise dB(A) 49 24 38 43 45 43 36 26 V · m3/h ñ = 1.20 kg/m3 c m/s ptot pstat. Äptot Äpstat. Pa Frequency Hz Total 125 250 500 1k 2k 4k 8k LWA Air noise dB(A) 52 37 43 48 47 42 34 27 LPA,4m Air noise dB(A) 32 17 23 28 27 22 14 7 V · m3/h ñ = 1.20...

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