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Centrifugal Fans

Centrifugal Fans
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Centrifugal Fans

Product catalog summary
General Concepts on Centrifugal Fans
Centrifugal fans feature a spiral casing with a rotating impeller powered by an external energy source, usually an electric motor. Key characteristics include flow rate, pressure, efficiency, and rotational speed. Flow rate is the volume of fluid moved per unit time, while pressure includes static and dynamic components. Efficiency is the ratio of energy delivered to the fluid versus energy consumed by the fan. Rotational speed is measured in revolutions per minute.
Fans Series AP, APR, APR./N8, APRD
Each fan series is tailored for specific applications, with detailed performance metrics and dimensions provided. The catalogue includes sections on usage, performance, and dimensions for each series.
Accessories and Components
Information on available accessories, types of support, and bearings is provided, along with a section on spare parts nomenclature.
Symbols and Measurement Units
The catalogue uses specific symbols and units for measurements, including flow rate (V), total pressure (pt), dynamic pressure (pd), speed (c2), fan rounds (n), noise level (Lp), power absorbed (P), and fan efficiency (η).
Construction Standards
Fans are constructed according to UNI 7972 standards, with various execution types for different coupling methods and temperature tolerances, including belt drive and direct drive configurations.
Performance Characteristics
Performance characteristics are based on tests conducted at 15°C and 760 mmHg, with specific weight of air at 1.226 Kg/m3. Adjustments for different temperatures and specific weights are guided by fundamental laws governing fan performance.
Overview of Centrifugal Fans
Centrifugal fans consist of a rotating wheel within a scroll casing, driven by an external energy source. Key characteristics include delivery, pressure, efficiency, and rotation speed.
Delivery
Measured as the volume of fluid moved by the fan per unit time.
Pressure
Total pressure is the sum of static and dynamic pressures, with static pressure overcoming circuit resistance and dynamic pressure representing the kinetic energy of moving fluid.
Efficiency
Efficiency is the ratio of energy supplied by the fan to the fluid versus energy used by the external source.
Rotation Speed
Measured in revolutions per minute, indicating the speed required for desired performance.
Variation of Rotation Speed with Constant Air Specific Gravity
Flow rate varies directly with rotation ratio, pressure varies with the square of the rotation ratio, and energy varies with the cube of the rotation ratio.
Variation of Air Specific Gravity with Constant Rotation Speed
Flow rate remains constant, while pressure and energy vary directly with the ratio of specific gravities.
Specific Gravity of Air
Calculated at different temperatures and pressures, with tables providing specific gravity at various conditions.
Specifications and Variations
For intermediate characteristics not listed in tables or for air aspiration at different temperatures and specific gravities, fundamental laws apply to regulate fan characteristics.
Noise Level
Sound pressure values are measured in decibels (dB/A) at 1.5 m from the fan operating at maximum efficiency, according to UNI standards.
Orientations
Fans can be constructed in 16 positions (8 clockwise, 8 counterclockwise) as per orientation tables.
Accessories (Available on Request)
  • Intaking and pressing counterflange
  • Inspection door for cleaning
  • Discharge cap for condensate removal
  • Vibrating proof joints
  • Safety grate for intaking throat
  • Regulation lock and flow rate regulator
Special Constructions
  • Spark Proof: For explosive fluids or dangerous environments, non-ferrous materials are used.
  • Corrosion Proof: For corrosive fluids, parts are painted or made with special materials like austenitic stainless steels.
Practical Air Velocity Values
Recommended air velocities in ducts for various materials and environments are provided.
Air Exchange Rates
Suggested air exchange rates for different environments are provided.
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Catalog excerpts

Centrifugal Fans-1

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Centrifugal Fans-2

2 Catalogo edizione Gennaio 2006 January 2006 cataloque edition Catalogue edition Janvier 2006 Katalag Ausgabe Jänner 2006 Catálogo edición Enero 2006 Concetti generali sui ventilatori centrifughi. Costruzione, orientamenti, caratteristiche, rumorosità, accessori, costruzioni speciali. General concepts on centrifugal fans. Construction, orientations, characteristics, noise level, fittings, special constructions. Idées générales sur les ventilateurs centrifuges. Construction, orientations, caractéristiques, niveau sonore, accessoires, constructions spéciales. Allgemeines über Radialventilatoren....

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Centrifugal Fans-3

3 Simboli e unità di misura usate nelle pagine del catalogo. V m3/min. = Portata in m3/min. V m3/h = Portata in m3/ora pt Kgf/m2 = Pressione totale in mm H2O o Kgf/m2 pt Pa = Pressione totale in Pascal pd Kgf/m2 = Pressione dinamica in mm H2O o Kgf/m2 pd Pa = Pressione dinamica in Pascal c2 = Velocità in m/s sulla bocca di uscita n = Giri ventilatore Lp = Rumorosità espressa in dB/A P = Potenza assorbita in kW ç = Rendimento del ventilatore Symbols and measurement units used in the catalogue. V m3/min. = Delivery in m3/min. V m3/h = Delivery in m3/hour pt Kgf/m2 = Total pressure in mm H2O or...

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Centrifugal Fans-4

4 Esecuzioni costruttive dei ventilatori secondo le norme UNI 7972. Fans constructive executions in conformity with rules UNI 7972. Executions constructives des ventilateurs sélon UNI 7972. Diese Ventilatoren werden nach den Normen gebaut UNI 7972. Realizaciones constructivas de los ventiladores de conformidad con las normas UNI 7972 Designazione in pianta delle posizioni dei motori per trasmissione a cinghie. Plan for motor positioning belt drive. Désignation relative à la position du moteur pour entraˆinement par courroies. Bezeichnung der Anordung des Motors bei Keilriemenantrieb. Indicacíon...

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Centrifugal Fans-5

5 Concetti generali sui ventilatori centrifughi Il ventilatore centrifugo è costituito da una coclea nel cui interno ruota una girante sotto l’azione di una sorgente di energia esterna (normalmente un motore elettrico). Le caratteristiche principali distintive di un ventilatore centrifugo sono: a) portata c) rendimento b) pressione d) velocità di rotazione PORTATA È rappresentata dal volume del fluido aspirato dal ventilatore nell’unità di tempo; viene espressa normalmente in m3/sec., m3/min., o m3/h. PRESSIONE Viene comunemente espressa in Kgf/m2 o Pa. La pressione generata da un ventilatore...

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Centrifugal Fans-6

6 General concepts abouts centrifugal fans The centrifugal fan essentially in a scroll in which a wheel rotates. The wheel’s movement is caused by an external energy source, that is usually an electric motor. The main characteristics of a centrifugal fan are: a) delivery c) efficiency b) pressure d) rotation speed DELIVERY It is indicated by the value of the fluid intaken through the fan in the time unit; normally this is stated by the ratio m3/sec., m3/min., or m3/h. PRESSURE It is usually indicated by the ratio Kgf/m2 or Pa. The pressure generated through a fan is named TOTAL (pt); it is the...

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Centrifugal Fans-7

7 Par le tableau suivant our pourra lire directement le poids de l’air à quelques températures: t°C ã Tableau démontrant la pression barométrique par rapport à l’altitude au dessus du niveau de la mer: mt 0 Pb mm Hg 760 500 720 1000 680 1500 640 2000 600 2500 560 3000 530 3500 500 4000 470 4500 440 -20 1,396 1,342 1,293 1,248 1,226 1,205 1,165 1,128 1,093 1,060 1,029 1,000 0,973 0,947 0,90 0,85 0,82 0,78 0,75 0,72 0,69 0,66 0,64 0,62 0,59 0,56 -10 0 +10 +15 +20 +30 +40 +50 +60 +70 +80 +90 +100 +120 +140 +160 +180 +200 +220 +240 +260 +280 +300 +325 +350 Généralités sur les ventilateurs centrifuges...

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Centrifugal Fans-8

8 Aus der folgenden Tabelle ist das spezifische Gewicht der Luft bei den verschiedenen Temperaturen zu entnehmen: t°C ã Luftdruck in Abhängigkeit von der Höhe über dem Meeresspiegel: mt 0 Pb mm Hg 760 500 720 1000 680 1500 640 2000 600 2500 560 3000 530 3500 500 4000 470 4500 440 -20 1,396 1,342 1,293 1,248 1,226 1,205 1,165 1,128 1,093 1,060 1,029 1,000 0,973 0,947 0,90 0,85 0,82 0,78 0,75 0,72 0,69 0,66 0,64 0,62 0,59 0,56 -10 0 +10 +15 +20 +30 +40 +50 +60 +70 +80 +90 +100 +120 +140 +160 +180 +200 +220 +240 +260 +280 +300 +325 +350 Allgemeines über Radialventilatoren Der Radialventilator besteht...

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Centrifugal Fans-9

9 En la siguiente tabla podrá leer directamente el peso del aire a las diferentes temperaturas: t°C ã Tabla para leer directamente la presión barométrica a las diferentes altitudes con respecto al nivel del mar: mt 0 Pb mm Hg 760 500 720 1000 680 1500 640 2000 600 2500 560 3000 530 3500 500 4000 470 4500 440 -20 1,396 1,342 1,293 1,248 1,226 1,205 1,165 1,128 1,093 1,060 1,029 1,000 0,973 0,947 0,90 0,85 0,82 0,78 0,75 0,72 0,69 0,66 0,64 0,62 0,59 0,56 -10 0 +10 +15 +20 +30 +40 +50 +60 +70 +80 +90 +100 +120 +140 +160 +180 +200 +220 +240 +260 +280 +300 +325 +350 Conceptos generales sobre los...

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10 CARATTERISTICHE Le caratteristiche riportate sui diagrammi sono riferite ad aria alla temperatura di +15°C, alla pressione barometrica di 760 mm Hg, con peso specifico di 1,226 Kg/ m3. RUMOROSITÀ I valori di pressione sonora indicati in catalogo sono espressi in decibel scala A (db/A), si intendono misurati in campo libero alla distanza di m.1,5 dal ventilatore funzionante alla portata di massimo rendimento e collegato a tubazione in aspirante e in premente secondo norme UNI. ORIENTAMENTI Tutti i ventilatori possono essere costruiti in 16 posizioni diverse della bocca di mandata (8 con senso...

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Centrifugal Fans-11

11 EIGENSCHAFTEN Die Parameter in den Tabellen beziehen sich auf Luft mit einer Temperatur von 15°C bei einem Luftdruck von 760 mm Hg. (Spezifisches Gewicht der Luft 1,226 Kg/m3). SCHALLPEGEL Die Schallwerte sind in Dezibel, Skala A db (A) angegeben. Sie wurden im Freifeld im Abstand von 1,5 m entfernten, unten Vollast arbeitenden, saug-und drückseitig angeschlossenem Ventilator entsprechend der UNI-Norm ermittelt. GEHÄUSESTELLUNGEN: Alle Radialventilatoren können mit 16 verschiedenen Stellungen der Drucköffnung gebaut werden (8 mit Uhrzeigersinn RD und 8 mit Gegenuhrzeigersinn LG) wie in der...

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All EUROVENTILATORI INTERNATIONAL catalogs and technical brochures

  1. EUc/EUMc

    94  Pages

  2. EU/EUM/MPR/TR

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  3. EVP/EVF/EVL

    30  Pages

  4. BPRc/BPc

    70  Pages

  5. AP APR

    64  Pages

*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.