ventilatoare@saveb.ro

+40. 21. 255 21 66

+40. 723.384.732

V141- HIGH PRESSURE CENTRIFUGAL FAN

 

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V 40 – MIDDLE PRESSURE CENTRIFUGAL FAN

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V 32T – LOW PRESSURE RADIAL FAN, MIDDLE PRESSURE AIR TRANSPORTATION

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V 20 – HIGH PRESSURE CENTRUFUGAL FAN

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NON-DIMENSIONAL COEFFICIENTS

Besides the figures subject to calculations or measurements, there are some dimensionless coefficients resulting from practice for each family of fans. They are used to make the liason between the functional parameters (flow and pressure), geometric and kinematic parameters. For example, the differences between the installed power of a particular engine, which is the same and the different kind of power, which are different, absorbed by the shafts of the various types of industrial fans are embodied in these coefficients.

The same is the case for energy calculation. Which means that, at the end of the day, the yield of the industrial fan, in fact, depends  directly on these coefficients.

Thank you and wait to meeting you in the next pages. Or, even better, in our factory …         

      Lucian GOJ, Research & Development Director,

+40.729.766 000, lucian.goj@saveb.ro

 COMPANIA DE VENTILATOARE-SA

Bulevardul Basarabia Nr. 256 (Incinta Faur)

Cod postal 030352, Sector 3, BUCURESTI

Tel :     + 40. 21. 255 21 66              E-mail: ventilatoare@saveb.ro

Fax :     +40. 21. 255 48 74                                 www.saveb.ro

Mobile:+40. 724. 343 241 … Marian CAPITANEANU,

Technical Assistance/Clients’ Requests Consultancy and Technical Offers

+40. 723. 384 732 … Carmen ZAMFIR,

Marketing, Offers’ Requests Analysis and Technical & Commercial Offers

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POWER & EFFECTIVENESS OF THE INDUSTRIAL FAN.

The power of the industrial fan

This is given by the force transmitted to the fluid that is transported. Therefore it can be said that the work done in a timeframe for the transmission of a fluid characterizes the fan’s power output.

The internal power is given by adding two elements: the consumed power and the absorbed power. The consumed power is the power that pays for energy losses that occur in the motor during operation from the actions that take place inside the fan (recirculated flow, friction in the housing, etc). The absorbed power is the power that is actually taken out by the fan shaft from the drive motor. But the installed power is the one that is performed by the drive motor as such, being listed on its label marking and is higher than the absorbed power.

The closer the power consumption and power input are to the installed power means that different types of friction losses and losses due to internal engine operation are lower and thus  the yield of the industrial fan is higher. In other words, there is / are creating a large reservoir of energy that can be transmitted to the working environment, hence the given system that engages the fan industry has no other major losses in the process, its yield may increase only based on the increase of efficiency of industrial fan.

The yield of the industrial fan

The yields of the fan are:

– internal yield: ηint

– mechanical yield of the fan: ηmec

– yield of the  fan: ηf

– the yield of the drive motor is a size that characterizes the drive motor: ηmot [%], but influences directly the yield of the entire assembly of which consists the industrial fan

– transmission yield: ηtr [%],

Taking into consideration the above separate yields, for the cooling fans direct driven the yield of the fan can be also defined as   ηtr [%] = 1-overall efficiency of the unit

Thus, the industrial fan yield is calculated as follows:  η [%] = ηf . ηmot . ηtr

Thank you and wait to meeting you in the next pages. Or, even better, in our factory …         

 Lucian GOJ, Research & Development Director,

+40.729.766 000, lucian.goj@saveb.ro

 COMPANIA DE VENTILATOARE-SA

Bulevardul Basarabia Nr. 256 (Incinta Faur)

Cod postal 030352, Sector 3, BUCURESTI

Tel :     + 40. 21. 255 21 66              E-mail: ventilatoare@saveb.ro

Fax :     +40. 21. 255 48 74                                 www.saveb.ro

Mobile:+40. 724. 343 241 … Marian CAPITANEANU,

Technical Assistance/Clients’ Requests Consultancy and Technical Offers

+40. 723. 384 732 … Carmen ZAMFIR,

Marketing, Offers’ Requests Analysis and Technical & Commercial Offers

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INDUSTRIAL FAN. SPECIFIC ENERGY. REPRESENTATION AND INTERPRETATION

As we have seen, the predominant relationship for the calculation of any industrial fan is the one between pressure and flow. Always when the flow rate increases according to the relation Q m = p.Qv (where Qm is the massic flow and Qv is the volumic flow), the pressure Δp defined as total pressure and determined that the relationship Δpt = pt2-pt1 where: pt2 = ps2 + p, (i.e. the difference between total average discharge pressure Pt2 and total pressure pt1 average intake) decreases. Depending on these, they draw for each industrial fan, through measurements, the working diagram.

Also on the same chart, taking into account the to the same parameters, it is calculated and represented the absorbed power Nef and which, as natural, increases as the flow rate increases in use too. Consequently, the question which always arises for calculating energy efficiency is actually the drawing of the rising slope of Nef. The more flatter it is, angled slightly lower growth as horizontal, it means that the energy consumption is lower  and the difference ceased to the environment is therefore significantly reduced. Hence the effective yield for use of the industrial fan will be greater, namely its effectiveness.

With increasing pneumatic energy also increase the kinetic energy as well as the pressure energy. The specific fan energy is given therefore by the reducing of the volume of fluid due to performing mechanical work from suction area to the discharge area. The rotor is practically the subassembly which performs the specific energy of the fan.

Thank you and wait to meeting you in the next pages. Or, even better, in our factory …         

      Lucian GOJ, Research & Development Director,

+40.729.766 000, lucian.goj@saveb.ro

 COMPANIA DE VENTILATOARE-SA

Bulevardul Basarabia Nr. 256 (Incinta Faur)

Cod postal 030352, Sector 3, BUCURESTI

Tel :     + 40. 21. 255 21 66              E-mail: ventilatoare@saveb.ro

Fax :     +40. 21. 255 48 74                                 www.saveb.ro

Mobile:+40. 724. 343 241 … Marian CAPITANEANU,

Technical Assistance/Clients’ Requests Consultancy and Technical Offers

+40. 723. 384 732 … Carmen ZAMFIR,

Marketing, Offers’ Requests Analysis and Technical & Commercial Offers

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SOME ELEMENTS OF THEORY FOR INDUSTRIAL FANS. FLOW. PRESSURE.

It is extremely important that the performance of industrial fans to be measured, to confirm constructive calculations carried out a priori of their choice. Only after this can install a fan in the desired industrial location assuring that it will fulfill the technological functions and / or the ambient requested by the customer.

It was seen in a previous article that the airflow can be calculated with the following formula:

        room volume [m3] x number of shifts per hour [1 / h] = air flow [m3 / h]  

According to a definition almost unanimously accepted in geography, geology, hydrology, fluid dynamics and engineering, the flow rate is the volume of a fluid, liquid or gas, passing a long drive through the cross section of flow of a river, stream, a fountain, wells, pipelines etc. Knowing the flow rate is important for sizing industrial fan volumetric chosen so that they can provide the number of shifts of fluid or gas per unit of time, usually within an hour, necessary to achieve the purpose for which this industrial fan is working.

In any ventilation system, especially in one industrial ventilation that needs fully functional dynamic equilibrium and knowledge, it is also necessary another second variable in the equation, utmost essential for its functioning. This is the pressure of the gaseous fluid which is circulated by the industrial fan.

DSC_0114 img_20140411_132322 dsc_0032 scan0150 scan0146

VPV 1400_ fan for gas extraction facility_delivered an installed at ROMGAZ Medias, Romania

VPV 1400_ fan for gas extraction facility_delivered an installed at ROMGAZ Medias, Romania

VGA_burned gas captation fan_delivered and installed at BANYAS Refinery and Thermo Complex, Syria

VGA_burned gas captation fan_delivered and installed at BANYAS Refinery and Thermo Complex, Syria

V 32T (front) and V 50 (back)_transportation fans with protection for heavy corrosive working atmosphere_delivered and installed at ARTROM-SA Slatina,Romania

V 32T (front) and V 50 (back)_transportation fans with protection for heavy corrosive working atmosphere_delivered and installed at ARTROM-SA Slatina,Romania

V 32T-1400CR_fan for heavy transportation and working continuously at 200C temperature_delivered and installed at ALRO Slatina, Romania

V 32T-1400CR_fan for heavy transportation and working continuously at 200C temperature_delivered and installed at ALRO Slatina, Romania

dsc_0003 dsc_0336

Dynamic pressure, usually denoted PDIN is the additional pressure of a fluid that would hit the surface and would be forced to consume its full kinetic energy. For this reason, the pressure is influenced by the diameter, length and material from which the pipe is made. Dynamic pressure is used to calculate pressure drops in piping systems. Technical solutions exist both for pressure and for reducing them. In the particular case of the fan duct it is essential to take into account the available static pressure, as this determines the maximum length of the section ventilation. Depending on the length of the tubing section miscarriages can occur and therefore a decrease in yield industrial fan duct on the farthest portion of the ventilation system because of its aspiration ability decreases as the distance increases.

Depending on the correlation in dynamic equilibrium permanent of these two parameters, the flow rate and dynamic pressure PDIN and relationships mathematical-physical that define their operation and that we reviewed in previous articles, the fans are divided into various classes operating with such as low pressure and high flow rates, pressures and flow media environments, high pressure and high flow rates and various other combinations thereof. These combinations determine the choice of industrial fan for a certain type of operation that responds best goal.

Thank you and wait to meeting you in the next pages. Or, even better, in our factory …   

 Lucian GOJ, Research & Development Director,

+40.729.766 000, lucian.goj@saveb.ro

 COMPANIA DE VENTILATOARE-SA

Bulevardul Basarabia Nr. 256 (Incinta Faur)

Cod postal 030352, Sector 3, BUCURESTI

Tel :      +40. 21. 255 21 66              E-mail: ventilatoare@saveb.ro

Fax :      +40. 21. 255 48 74                                 www.saveb.ro

Mobile:  +40. 724. 343 241 … Marian CAPITANEANU, Technical Assistance/Clients’ Requests Consultancy, Technical Offers Design

Mobile:  +40. 723. 384 732 … Carmen ZAMFIR, Marketing, Offers’ Requests Analysis, Technical & Commercial Offers Preparation

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SOME ELEMENTS OF THEORY FOR INDUSTRIAL FANS. ENERGY.

I said in the previous article that although the fans are essentially simple equipment and principle quite usual, regardless of the size or function of their specific, even in industry there is a tendency to underestimate the importance, enjoying our attention only when their performance is lacking, affecting, sometimes severely, the operation of other equipment. Therefore the calculation of the required air flow and ventilation choosing an industrial fan can be a real challenge, and the wrong choice can lead to its inefficiency. Therefore several principles of operation of fans believe it is useful to be mentioned below.

All fans, especially fans industrial builds, the principle of operation, the production and movement of currents flowing liquid or gas, depending on the environment. In general work environment is the air used either as industrial fans used for cooling of equipment or workspaces, whether they have to evacuate pollutants, dust, fumes or pneumatic conveying bulk materials.

The assembly’s main rotor any fan is a profiled wheel which has the effect that by its movement, its kinetic energy to transmit air, setting in motion currents of fluid to be transferred. The principle of movement and action of the rotor is the flywheel. This is a mechanism whose main part is a wheel rotating rotor in our case, the drive stores the kinetic energy. Shaped wheel ensures a high moment of inertia, which opposes changes in rotation, based on the physical property of conservation of angular momentum. I mean a body that rotates around its axis tends to keep the axis of rotation and will oppose a disruptive impulse to another, along an axis perpendicular to the rotation axis and the axis pulse disruptive.

Flywheel’s energy is transmitted by applying a torque, which makes the speed to increase progressively storing energy. The energy stored in the flywheel is proportional to the square of the speed of rotation ω2.In further flywheel or rotor, and releases this energy practically applying it a couple working environment, the fluid (air) floated by industrial fan which is driven at a speed so proportional to the square of the speed of rotation, as we saw above. Efficient industrial fan is just on a power calculation, which was reflected especially evident efficiency and ventilation equipment that transmitted the mass of fluid that train.

In this way, the fluid, air or polluted air contaminant, air transport for use as a pneumatic or air cooling benefits of supply with greater power than the power source continues. In other words the energy released by the rotor is multiplied against the power supplied by the engine. A flywheel can store energy to release gradually and suddenly, with great power. And the ratio multiplier depends primarily on the size of the rotor, the flywheel.

At the same time providing guidance of the industrial fan fluid (air) to the mechanical system is considered. The angular momentum of the flywheel is transmitted as torque to the mechanical system. The flywheel is the one that supplies power to its orientation to the desired position, respectively guiding the flow is fluid in the direction and force required for the purpose fan operation (transport heavy particles or less heavy quench maintaining a specified temperature when in space so there is a quasi-constant heat input from another source or to achieve a thermal threshold in a determined time, absorbing gases, vapors or bulk materials, etc.)

Thank you and wait to meeting you in the next pages. Or, even better, in our factory …

 Lucian GOJ, Research & Development Director,

+40.729.766 000, lucian.goj@saveb.ro

 COMPANIA DE VENTILATOARE-SA

Bulevardul Basarabia Nr. 256 (Incinta Faur)

Cod postal 030352, Sector 3, BUCURESTI

Tel :      +40. 21. 255 21 66              E-mail: ventilatoare@saveb.ro

Fax :      +40. 21. 255 48 74                                 www.saveb.ro

Mobile: +40. 724. 343 241 … Marian CAPITANEANU, Technical Assistance/Clients’ Requests Consultancy, Design of the Technical Offers

Mobile: +40. 723. 384 732 … Carmen ZAMFIR, Marketing, Offers’ Requests Analysis, Elaboration and Preparation  of the Technical & Commercial Offers

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SAVEB, a continuously growing business

Although 2015 and 2016 were difficult for all industrial companies in Romania, the company COMPANIA DE VENTILATOARE- SA was imposed even in these difficult conditions, manufacturing only industrial technological ventilation products, resistant to harsh working conditions, like dust, leakages toxic and high operating temperatures, made for endurance, their quality being unanimously recognized by their beneficiaries.

Thus COMPANIA DE VENTILATOARE- SA maintains a stable market share and continues the tradition of producing the industrial fans named SAVEB, own brand of our company, already a classic in the Romanian industrial landscape. According to the same traditions, the industrial fans SAVEB are produced by us, COMPANIA DE VENTILATOARE- SA, only under the express requirements of our customers and are the results of the measurements and of our projects made case by case specific to each beneficiary.

Hence the results … Hence the recognition … Hence the same obligations for the future …!

Thank you and wait to meeting you in the next pages. Or, even better, in our factory …         

     

            Lucian GOJ, Research & Development Director,

Mobile:+40.729.766 000,  E-mail: lucian.goj@saveb.ro

LOGO3 COMPANIA DE VENTILATOARE-SA

Bulevardul Basarabia Nr. 256 (Incinta Faur)

Cod postal 030352, Sector 3, BUCURESTI

Tel :     + 40. 21. 255 21 66              E-mail: ventilatoare@saveb.ro

Fax :     +40. 21. 255 48 74                                 www.saveb.ro

Mobile:+40. 724. 343 241 … Marian CAPITANEANU,

Technical Assistance/Clients’ Requests Consultancy and Technical Offers

Mobile:+40. 723. 384 732 … Carmen ZAMFIR,

Marketing, Offers’ Requests Analysis and Technical & Commercial Offers

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