Novax. Axial flow fans Standard and hot smoke

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1 Novax Axial flow fans Standard and hot smoke

2 Product facts Product Axial flow fans with adjustable blades. ACN for duct installation ACW for heavy duty ACG free intake with connection to duct ACP free suction and exhaust, for wall mounting Application Novax fans are available for both land and marine applications. The fans are made for comfort and industrial use in standard, Ex and ATEX versions. Range Impeller diameters are between Ø and Ø for standard fans and between Ø and Ø for hot smoke fans. Hub sizes are between Ø and Ø for both standard and hot smoke fans. Air flow rates range from. to m /s with pressure increases up to Pa for standard fans and from. to m /s with increases up to Pa for hot smoke fans. Hub diameters [mm] Number of blades Novax Ø Ø Ø Ø Ø Ø Ø Number of blades according to hub diameter Standard motors Dimension standard: IEC- Electrical standard: IEC- Enclosure: IP- or IP- Insulation: Class B, F or H Balancing: ISO Structural shape: B and B for flanges Hub diameters [mm] Ø ACN/W ACP/G Important The choice of motor manufacturer and sizes is limited due to special requirements for installation. This applies especially for type ACN. Materials Blades: Aluminium or glass fibre reinforced polyester (GRP). Please note that impellers with hub sizes Ø and Ø mm, only are made with aluminium blades. Hot smoke fans are made only with blades of aluminium. Hub: Hot-dip galvanised sheet steel (Sendzimir galvanised) Fan housing: Hot-rolled, hot-dip galvanised sheet steel Flange standard Motor sizes - - Ø - Ø - Ø - Ø - Ø - Ø - / (ACN) ACN, ACW, ACP and ACG motor sizes Flanges are in accordance with Eurovent /. The flanges on the ACW follow the DIN standard. Classifications Technical capacity in accordance with BS : and ISO :. The fans meet the requirements for operation in unheated, low-corrosion environments in accordance with DS /EN ISO - and corrosion category C. The casing is also available in stainless steel as AISI L and with the impeller of aluminium, all in corrosion class C high. The temperature range for the fans is as standard - to + C. Max. temperature range is - to + C. GRP-blades are limited to max. + C. At - to - C and + to + C, with reduced RPM and special motors. Fans used for hot smoke removal are approved in class F according to EN - to operate for at least min. at C. The ACN fans are approved to operate for at least min. at C. Accessories Mounting feet Mounting plates Inlet cones with wire guard Counter flanges Duct spigots Flexible connections Silencers with or without cores Acoustic diffusers with or without cores Spark proof lining Anti-vibration mountings Diffusers Welding spigots Outlet wire guards Downstream guide vane arrangement Novax

3 Contents Description RPM and frequency regulation Type descriptions Overview of types and accessories Performance curves for ACN at Hz Performance curves for ACG at Hz Performance curves for ACP at Hz Dimensions Accessories Calculations Quality and service Important This document is provided as is. Novenco reserves the right to changes without further notice due to continuous product development. The fan is designed for continuous operation. The following kinds of operation may cause fatigue break in the impeller and endanger people. Operation in stall area Operation with pulsating counter pressure called pump mode Operation with repeated starting and stopping If in doubt, Novenco should be contacted to assess the suitability of the fan. Copyright (c) -, Novenco A/S. All rights are reserved. Patents and trademarks Novenco, ZerAx, and are registered trademarks of Novenco A/S. The ZerAx manufacturing processes, technologies and designs are patented by Novenco A/S. Pending US patents include no. /,; /,; /,; /, and /,. Granted US patents include no. DS, DS, DS, DS and DS. Other trademarks appearing in this document are the property of their respective owners. Quality and environment Novenco is certified in accordance with ISO and. MU Novax

Description Novax are compact, robust, series-produced axial flow fans with presettable blades. The fans are installed in a wide range of ventilation systems on land and off-shore.

The fans require little space, are easy to install and offer high operational reliability. Special Ex and ATEX versions for hazardous environments are also offered.

4 Description Novax are compact, robust, series-produced axial flow fans with presettable blades. The fans are installed in a wide range of ventilation systems on land and off-shore. Systems include comfort systems, industrial, process, parking and tunnel ventilation as well as environment-enhancement systems. The fans require little space, are easy to install and offer high operational reliability. Special Ex and ATEX versions for hazardous environments are also offered. fans, however, only with blades of aluminium. The two blade types have identical performance characteristics. Impellers with hub sizes Ø and Ø mm are only made with aluminium blades. In the temperature range - to + C the lighter and more corrosion-resistant GRP blades are standard. In the ranges - to C and + to + C both blade types can be used. Please note that this is with reduced RPM and special lubricant in the motors. In the range to C, aluminium blades are used exclusively and at reduced RPM. All fan types use flange motors. Classifications The fans are as standard delivered for operation in unheated low corrosive environments according to DS/ EN ISO - and corrosion category C. Versions in stainless steel for category C is available as option. Impeller Novax fan types The Novax impeller consists of a pressed, two-part, assembled hub with grooves in which the blades are fixed. The impeller is provided with a hub boss on one side for mounting onto the motor. The impeller blades can be fixed steplessly at the factory at angles between and, depending on size and RPM. The impeller is integrated with the motor in different designs of fan housings to form standard fan types with several applications. ACN for duct installation ACW for heavy duty ACG free intake with connection to duct ACP free suction and exhaust for wall mounting Blade materials and motors The impellers are fitted with blades of either glass fibre reinforced polyester (GRP) or aluminium hot smoke The fans are furthermore approved as fans for removal of hot smoke according to EN -. Adjustment of blade angles The blade angle for the fan matching a specific capacity is calculated with the AirBox program. The blade angle is adjusted in the factory in a precision tool and the impeller is aligned and balanced carefully. Balancing of impeller AirBox calculation program All Novax fans are calculated with the Novenco AirBox software tool. Input are requirements for air flow, pressure, environment characteristics etc. AirBox is free to use, requires registration and updates automatically. It is downloaded from Novax

5 RPM and frequency regulation The fans are fitted with Hz motors as standard, and are available with Hz motors also. Alternatively, fans can speed-controlled by means of frequency inversion. See maximum speeds in the below table. Nominal RPM for Hz motors are found in the performance curves on pages through. Novax fans are a good alternative to centrifugal fans in ventilation and air conditioning systems with varying air flow rate requirements. case be bypassed, so that the motor runs at the maximum synchronous RPM. Selection of hot smoke fans with frequency inverters is done based on the synchronous RPM of the motors. In most cases, the motors are run over-frequently in the range - Hz. This is due to the non-existent fall in power output for the motors in the range - Hz. Additionally, the best performance for fans is often found in just the over-frequent area. The fans are prepared for frequency converter operation with RFI filters according to the product standard EN -, class. Using frequency converters removes the limitations caused by net frequencies of or Hz. Axial fans can almost always be placed within the maximum efficiency of up to %, while it remains possible to regulate the air quantities, if needed. Hot smoke fans may, however, not run frequency regulated during fire. The frequency inverter must in this Fans fitted with frequency drives require installation according to the EU standard for electromagnetic compatibility (EMC). The shielding and connection to ground eliminate interference and protect the fan motor bearings and windings. Investment, operational cost as well as space requirements are lower for Novax fans compared to fans without frequency regulation. Hub diameters [mm] Impeller diameters [mm] Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Maximum RPM for frequency regulated Novax impellers. All RPM are at C.. The maximum RPM is reduced at higher and lower temperatures.. The maximum RPM for the motors are considerably higher than those for the impellers typically. -. RPM. Novax

Type descriptions ACN and ACW for installation in ducts Mounting positions are in accordance with Eurovent for ACN arrangement D, motor position B. See also section Calculations page.

The direction of air flow for ACN-ACW fans is impeller - motor. ACN (left) and ACW axial fans The ACN and ACW fans are designed for duct installation.

The ACN-ACW range of axial fans comprises installation sizes with impeller diameters from Ø to Ø mm for standard fans and installation sizes with impeller diameters Ø to Ø mm for hot smoke.

to m /s with pressure increases up to Pa for hot smoke. As hot smoke fans the range is F and F approved according to EN - to run for at least min. at C and at least min. at C, respectively.

6 Type descriptions ACN and ACW for installation in ducts Mounting positions are in accordance with Eurovent for ACN arrangement D, motor position B. See also section Calculations page. The motor is a flange motor, mounted on the outlet side, and is provided with an electrical cable that passes out through the fan housing to a terminal box for electrical connection. The direction of air flow for ACN-ACW fans is impeller - motor. ACN (left) and ACW axial fans The ACN and ACW fans are designed for duct installation. The ACW is with a thicker fan casing extra durable and made for heavy duty. The ACN-ACW range of axial fans comprises installation sizes with impeller diameters from Ø to Ø mm for standard fans and installation sizes with impeller diameters Ø to Ø mm for hot smoke. There are seven hub diameter sizes from Ø to Ø mm for both fan types. Air flow rates run from. to m /s and pressure increases up to Pa for standard fans and from. to m /s with pressure increases up to Pa for hot smoke. As hot smoke fans the range is F and F approved according to EN - to run for at least min. at C and at least min. at C, respectively. The fan housing is cylindrical with connection flanges at both ends. The fan housing has a welded motor suspension of sheet steel that also forms a downstream guide vane. This produces an extremely high efficiency. The housing and motor suspension are hot-dip galvanised. The fan housing has an inspection hatch. The impeller unit is mounted directly on the shaft of the motor. If the motor cannot fit in the motor mount, it is displaced outside and connected to the impeller through a long hub. The flange pitch diameter, number of holes and hole size are as standard in accordance with Eurovent / for ACN and according to DIN for ACW. ACG for connection to ducts and ACP for wall mounting ACG (left) and ACP axial fans The ACG is designed for connection to duct ends. The ACP is for direct air transport through walls. The ACG-ACP range of axial fans comprises installation sizes with impeller diameters from Ø to Ø mm for standard fans and installation sizes with impeller diameters Ø to Ø mm for hot smoke. There are seven hub diameter sizes from Ø to Ø mm for both fan types. Air flow rates run from. to m /s and pressure increases up to Pa for standard fans and from. to m /s with pressure increases up to Pa for hot smoke. As hot smoke fans the range is F approved according to EN - to run for at least min. at C. The ACG fan housing is tubular with cone-shaped inlet for direct air intake and flange-terminated outlet. The ACP fan housing is short and tubular with coneshaped inlet for direct air intake and flange outlet. The impeller unit is mounted at the inlet with the motor facing the air intake. Novax

7 The inlet is provided with a wire guard. On the ACG a downstream guide vane is mounted on the outlet side of the impeller to achieve a very high efficiency. The flange pitch diameter, number of holes and hole size are as standard in accordance with Eurovent /. Mounting positions are in accordance with Eurovent for ACG arrangement B, motor position A and for ACP arrangement A, motor position A. See section Calculations page. The motor is a flange motor with electrical connection in the terminal box. The direction of air flow for ACG-ACP fans is motor - impeller. Novax

8 Overview of types and accessories Please note the combinations of motors and fans are general. Precise combinations of motors from specific suppliers and fans are available on request to Novenco or through use of the AirBox calculation program. See page for more details. = Standard fan ; Δ = Hot smoke fan Hub diameters [mm] Ø Ø Ø Ø Ø Ø Ø Motor sizes Type ACN and ACW Hub diameters [mm] Ø Ø Ø Ø Ø Ø Motor sizes Type ACG and ACP Impeller diameters [mm] Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Δ Δ Impeller diameters [mm] Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Δ Δ Δ Δ Novax

9 Hub diameters [mm] Ø Motor sizes Impeller diameters [mm] Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Type ACG and ACP. Hot smoke fans with hub diameter Ø, motor size and impeller diameter Ø are only made as type ACP. Δ = All versions ; = Limited number of versions ACN ACW ACG ACP Horizontal mounting feet Vertical mounting feet Mounting plate Inlet cone with wire guard Counter flange Duct spigot Welding spigots Flexible connections Silencer with or without core YAH YAH YAH YAH Acoustic diffuser with core YAD YAD YAD YAD Wire guard in casing (pressure side) Wire flange (pressure side) Spark proof lining Anti-vibration mountings Diffusers for outlet (short or long) Downstream guide vane arrangement Inspection hatch Accessories for standard and hot smoke fans. A standard clamping ring is used for joining two silencers type YAH. It is inadvisable to join more than two silencers with standard clamping ring.. Wire guard in casing comes with an installation pipe for sizes up to and including Ø.. The number of versions with spark proof lining is among others limited by the blade angle. Information on the versions offered with spark proof lining is available on request and in the AirBox calculation program. See page for more details.. The ACG is as standard fitted with downstream guide vanes. The ACP can be retrofitted with guide vanes and is then called ACG. Novax

10 Performance curves for ACN at Hz The diagrams show the coverage for each fan size without taking the hub diameter into consideration. The capacities are based on fan installation in accordance with BS, installation type D (duct connection for inlet and outlet). Other installation types yield other data. The air density is ρ =. kg/m. Final dimensioning, including calculation of blade angles, choice of motor, power consumption plus sound calculation, is done with AirBox. See section AirBox calculation program page. Total pressure, p t [Pa]... Air flow rate, qv [m/s] Type ACN RPM Total pressure, pt [Pa]... Air flow rate, q v [m /s] Type ACN RPM Novax

11 Total pressure, pt [Pa]... Air flow rate, qv [m/s] Type ACN RPM Total pressure, pt [Pa]... Air flow rate, q v [m /s] Type ACN RPM Novax

12 Performance curves for ACG at Hz The diagrams show the coverage for each fan size without taking the hub diameter into consideration. The capacities are based on fan installation in accordance with BS, installation type B (free inlet and duct connection for outlet). Other installation types yield other data. The air density is ρ =.kg/m. Final dimensioning, including calculation of blade angles, choice of motor, power consumption plus sound calculation, is done with AirBox. See section AirBox calculation program page. Total pressure, pt [Pa],,, Air flow rate, q v [m /s] Type ACG RPM Total pressure, pt [Pa],,, Air flow rate, q v [m /s] Type ACG RPM Novax

13 Total pressure, p t [Pa],,, Air flow rate, q v [m /s] Type ACG RPM Total pressure, pt [Pa],,, Air flow rate, qv [m /s] Type ACG RPM Novax

14 Performance curves for ACP at Hz The diagrams show the coverage for each fan size without taking the hub diameter into consideration. The capacities are based on fan installation in accordance with BS, installation type B (free inlet and duct connection for outlet). Other installation types yield other data. The air density is ρ =.kg/m. Final dimensioning, including calculation of blade angles, choice of motor, power consumption plus sound calculation, is done with AirBox. See section AirBox calculation program page. Total pressure, pt [Pa],,, Air flow rate, q v [m /s] Type ACP RPM Total pressure, pt [Pa],,, Air flow rate, q v [m /s] Type ACP RPM Novax

15 Total pressure, pt [Pa],,, Air flow rate, q v [m /s] Type ACP RPM Total pressure, p t [Pa],,, Air flow rate, q v [m /s] Type ACP RPM Novax

16 Dimensions ACN and ACW ØD ØN ØA C L Hub diameter ØN Motor Installation size (impeller diameter) size Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø ØA ØD All All P ØR C All All & & & L - Max. weight, no motor L Max. weight, no motor L Max. weight, no motor ACN and ACW. Depends on motor size. Dimensions are in mm. Weights are in kg. Novax

17 ACG and ACP ØJ ØD ØA ØJ ØD ØA Hub Motor Installation size (impeller diameter) diameter ØN size Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø ØA ØD All All P ØR ACG and ACP Hub Motor Installation size (impeller diameter) diameter ØN size Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø C.. All ØJ All L F Max Max. weight, no motor L - All F Max Max. weight, no motor ACG. F Max is the maximum dimension based on motor make type ABB.. For type ACG-/ L = and for ACG-/ L =.. For hub diameter Ø mm. The weight is lower for other hub diameters Hub Motor Installation size (impeller diameter) diameter ØN size Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø C.. All ØJ All L F Max Max. weight, no motor L - All F Max Max. weight, no motor ACP. F Max is the maximum dimension based on motor make type ABB.. For type ACP-/ L = and ACP-/ L =.. For hub diameter Ø mm. The weight is lower for other hub diameters. Dimensions are in mm. Weights are in kg. Novax

18 Accessories ACN and ACW mounting feet (horizontal) H F N x ØU C L Two braces from size to Installation size (impeller diameter) Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø G H C / / L F / N ØU Weight Where C and F dimensions depend on the hub diameter, the values for hub diameters Ø - Ø are on the left and for the hub diameters Ø - Ø on the right.. The specified data is based on maximum casing length. Other casing lengths have other data. Dimensions are in mm. Weights are in kg. Novax

19 ACG and ACP mounting feet and diffusers ØD ØA ØD ØA x ØU x ØU Mounting plate for vertical installation of fans Mounting feet for ACP hub size - Mounting feet for ACG hub size - ØD ØA ØD ØA x ØU x ØU Mounting feet for ACP hub sizes and Mounting feet for ACG hub sizes and P x ØR ØD ØD ØA ØD ØD ØA x ØU x ØU Mounting feet for ACG with short diffuser hub sizes and Mounting feet for ACG with long diffuser hub sizes and The ØA,, ØD, L, P and ØR dimensions are found on pages to. Other dimensions are found on the next page. Novax

20 Installation size (impeller diameter) Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø A Mounting plates B Weight G C M Mounting feet, L horizontal, for ACP N ØU Weight G C M Mounting feet, L horizontal for ACG N ØU Weight G C Mounting feet, M horizontal, for ACG L with short diffusers N ØU Weight L ØD Short diffusers ØA P ØR Weight G C Mounting feet, M horizontal, for ACG L with long diffusers N ØU Weight L ØD Long diffusers ØA P ØR Weight. Does not apply to hub diameters Ø and Ø mm. Request separate dimensional sketches for these diameters. Dimensions are in mm. Weights are in kg. Novax

21 Wire guards, flanges, spigots etc. for all Novax types V N E T G L F L F L S ØJ ØA ØA ØA ØDF ØA L T t Wire guard for cone Wire guard for installation in pipe and flange Inlet cone Pipe with wire guard Counter flange Duct spigot Flexible connection with one duct spigot Flexible connection with two duct spigots Welding spigots Wire guards Wire guards for installation in pipes Wire guards for installation on flanges Inlet cones Pipe with wire guard Counter flanges Duct spigots Flexible connections Welding spigots Dimensions are in mm. Weights are in kg. Installation size (impeller diameter) Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø V Weight N ØJ Weight N ØJ Weight E ØA Weight.... L T Weight T ØD F Weight G Weight L F Min. mm - Max. mm Min. mm - Max. mm Weight w. spigot L F Min. mm - Max. mm Min. mm - Max. mm Weight. w. spigots L S t ØA Weight The ØA and dimensions are found on pages and. Novax

22 Silencers, hoods and dampers ØM ØN ØD ØA ØD ØA ØD ØA Silencer type YAH Hood type HAN Damper type SBC All Silencers type YAH Hoods type HAN Dampers type SBC Installation size (impeller diameter) Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø ØD ØA P (number) ØR L ØN ØA ØR M M M M M M M M M M M M M M Weights without core Weights with core H H ØM C.. Weights L C Weights... Dimensions are in mm. Weights are in kg. Technical data for silencer YAH YAH pressure loss Without core: Insignificant With core:. x p df Two YAH in series:. x p df (dynamic pressure) Inlets on ACN use silencers without cores Example YAH- with core Air flow rate, q v =m /s Air speed, inlet = m/s p df =Pa Pressure loss:. x Pa = Pa Average values for sound attenuation Octave band [Hz] Type [db] [db] [db] [db] k [db] k [db] k [db] k [db] Without core With core Novax

Acoustic diffuser type YAD Acoustic diffusers type YAD are standard products for use in normal installations for comfort and industrial ventilation.

23 Acoustic diffuser type YAD Acoustic diffusers type YAD are standard products for use in normal installations for comfort and industrial ventilation. The YAD is available in sizes from Ø to Ø mm and with cores in seven sizes from Ø to Ø mm fitted according to the hub sizes in the Novax range. In connection with an itemised tender, fans can be supplied with improved surface treatment for use in corrosion class C. Please note that sound data and attenuation values are based on measurements with the Novax axial flow fan type ACG. Environment Acoustic diffusers type YAD are designed for the temperature range: - to + C. The basic version is, in terms of materials, designed to operate in the environmental category C as formulated in DS/EN ISO. Acoustic diffuser type YAD External diameter [mm] Hub diameter [mm] Attenuation values for YAD Octave band [Hz] k k k k Core Core Core Core Core Core Core Core Without With Without With Without With Without With Without With Without With Without With Without With [db] [db] [db] [db] [db] [db] [db] [db] [db] [db] [db] [db] [db] [db] [db] [db] Novax

24 Dimensions and weights for YAD ØA ØD ØD ØA Novax Fan side Duct side Hub L Weight [mm] ØA Size ØD ØA ØD [mm] [kg] [mm] [mm] [mm] [Qty. x mm] [mm] [mm] [mm] [Qty. x mm] x M x M x M x M. x M x M x M x M. x M x M.. x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M x M Novax

25 Spark proof lining for ACN and ACW To prevent galvanic corrosion special tape is applied to the back of the lining before installation. L L Installation sizes (impeller diameters) Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø Ø L Spark proof lining L hub - S Min Weights L Spark proof lining L hub and S Min Weights Tape with aluminium is used with ATEX fans, while tape with brass is used with EX fans.. S Min. is the minimum blade clearance of the impeller along the circumference of the casing. The value depends on the motor shaft diameter. Dimensions are in mm. Weights are in kg. Novax

26 Calculations Basis Novax fans are measured corresponding to the normal installation of the fans. See the following arrangements A, B, C and D. Installing ACN or ACG fans with free outlet (arr. C) causes loss of the entire velocity energy. However, fitting a diffuser on the outlet side lowers the outlet velocity, whereby some of the dynamic pressure loss is recovered as static pressure. Hence, the energy consumption of the fans is reduced. Novenco diffusers are designed to achieve optimal recovery of the dynamic energy. a-factor This is a loss factor, which is used if the fan is used with free outlet (arrangement A and C). The a-factor is related to the speed loss (Δp d ) resulting from the difference in air speed between the net inlet area and the total outlet area. Examples Fan type ACG RPM with free outlet q v =m /s ; p s =Pa The following is found with the AirBox program. ACG- / -- Required power with and without long diffuser is. and. kw, respectively. Hence,. kw is saved by mounting a long diffuser. ACG - / -- Required power with and without long diffuser is. and. kw, respectively. Hence,. kw is saved by mounting a long diffuser. Arr. A Free inlet and outlet Type ACP p sf =p s -p t The effect of the a-factor is reduced if a diffuser is mounted on the outlet side. The AirBox program compensates for the a-factor when the fan outlet is to a duct or as free outlet. For fans with duct connections on the outlet and otherwise unchanged dimensions (arr. B and D) the a-factor is included in the performance data and no correction is necessary. Symbols Units Mass flow q m kg/s Air quantity, volume flow q v m /s Formula q m ρ Formulas for pressure p sf Inlet diameter D mm Outlet diameter D mm Density ρ kg/m Flow area A m Mean speed of plane c x m/s Static pressure of plane p sx Pa Dynamic pressure of plane p dx Pa. ρ x c Total pressure of plane p tx Pa p sx + p dx Total pressure of fan p tf Pa Dynamic pressure of fan p df Pa. ρ x c Static pressure of fan p sf Pa p tf - p df System loss p t Pa Power consumption P kw Correction factor a q v A x p tf = p t -p t = p s +p d -(p s +p d ) = (p s -p s )+(p d -p d ) p sf = p tf -p df (Definition) All inlet sizes of the fan are designated by subindex and all outlet sizes by subindex. Novax

27 Arr. B Free inlet and duct on outlet Type ACG p tf = p t - p t = (p s + p d ) - (p s + p d ) Arr. C Duct on inlet and free outlet Type ACN p tf = p t - p t = p s + a x p d - (p s + p d ) Run-up time The run up time of the axial flow fan is calculated with the following formula. t s =. n ( I m + I v ) where P M s M k P v M M P t s = Run up time [s] P = Rated output of motor [kw] P v = Required power of fan [kw] n = Fan speed [RPM] M s M M k M = The ratio between the starting torque of the motor and the nominal torque = The ratio between the maximum torque of the motor and the nominal torque I v = Polar moment of inertia for the fan [kgm ] I m = Polar moment of inertia for the motor [kgm ] According to international standards the torque of the motor can vary within the following limits. x D p s - p t M s M k : -% + % of the catalogue value : -% + % of the catalogue value Arr. D Duct on inlet and outlet Type ACN p tf = p t - p t = (p s - p s ) + (p d - p d ) if p d = p d ; then p tf = p s - p s. x D p tf x D The above factors may increase the run up time more than calculated. Finding the total efficiency The total efficiency tells how effective the complete arrangement is. The efficiency is found with the following formula. η total = η fan x η motor, where η total : Total efficiency η fan : Fan efficiency η motor : Motor efficiency Novax

Quality and service Rest assured Warranty The Novenco Novax axial flow fans are produced in accordance with Novenco s well-known quality standards.

28 Quality and service Rest assured Warranty The Novenco Novax axial flow fans are produced in accordance with Novenco s well-known quality standards. Novenco is ISO certified and all fans are inspected and tested, before leaving the production. Novenco provides according to law a standard months warranty from the product is sent from the factory. The warranty covers materials and manufacturing defects. Wear parts are not covered. The fans are offered with options for technical guidance on installation, test of function and training of personnel. Extended warranty can be agreed upon. Novax

MU Novenco develops and manufactures ventilation systems that are marketed worldwide through

The company was founded in Denmark and has become one of the world-leading suppliers.

to ISO and ISO. The company headquarters are located in Naestved, Denmark.

29 MU Novenco develops and manufactures ventilation systems that are marketed worldwide through subsidiaries and agents. The company was founded in Denmark and has become one of the world-leading suppliers. Novenco symbolises quality and environmentally responsible operation and is certified according to ISO and ISO. The company headquarters are located in Naestved, Denmark. Novenco, ZerAx, and are registered trademarks of Novenco A/S. Read more about Novenco on the internet. Novenco Building & Industry A/S Industrivej Naestved Denmark Phone: +

Novenco Axial Flow Fans. Novax St andard and hot Smoke

Novenco Axial Flow Fans. Novax St andard and hot Smoke Novenco Axial Flow Fans Novax St andard and hot Smoke Product facts Product Axial flow fans with adjustable blades. ACN for duct installation ACG free intake with connection to duct ACP free suction and