Bearing employs to support, guide and restrain moving the element. The blower ran only on corded electricity. They turn much slower than centrifugal blowers (e.g. (Click once) We already discussed the fan performance curve earlier: a graph that shows the different pressures developed by the fan and the corresponding required power. Snow blowers were born out of necessity in Canada, where it snows for the most part of the year. One who discloses information about misconduct in their workplace that they feel violates the law or endangers the welfare of others. 1. (Point at the peak of one of the curves) The peak efficiency is also called the Best Efficiency Point (BEP) The peak efficiency ranges for different types of centrifugal and axial fans are given in the Table. If your property appears unreasonably big to be carrying a long cord around, you may do well to purchase a gas-powered blower. Gardner Denver’s IQ blower package is perfect for these small or medium applications. Thus, reducing the fan speed is a much more efficient method to decrease airflow since less power is required. For example, if the speed is increased by 10%, then the power requirement increases by 33%. \\ The centrifugal blower and the positive displacement blower are two main types of blowers, which are described next. A single-stage blower whirls the auger at a very high speed to cut and throw the snow. Roots air-blower type supercharger. Centrifugal blowers typically operate against pressures of 0.35 to 0.70 kg/cm2, but can achieve higher pressures. Scribd is the world's largest social reading and publishing site. Read here to know about various types of air compressors used and get a clear inside view of each type of compressor with the attached pictures. The fan operates at a point where the system resistance curve and the fan curve intersects. Centrifugal blowers are quiet and reliable and are made to operate in a variety of environments and applications. A sootblower is a device for removing the soot that is deposited on the internal furnace tubes of a boiler during combustion to prevent plugging of the gas passes and maintain boiler efficiency.. Types of soot blowers: Wall Blowers also known as IRs (Insertable Rotating) Long Retractable Soot Blower (LRSB) or IK (Insertable Kinetic) Air Heater Blower. Types of blades used in centrifugal fans are. In many applications, air flow and pressure (or vacuum) level requirements may determine what type of blower should be used. An increment in MEP makes the engine produce more power. In a mixed flow fan the air flows in … 5. The first step is to calculate the air or gas density using the given equation (Click once) Step 2. If you continue browsing the site, you agree to the use of cookies on this website. 5. It is not intended for … This is why fans in parallel are suited for low resistance systems. • The method for achieving these speeds is the main difference in the various types of high-speed turbo blowers. Now customize the name of a clipboard to store your clips. In other words, the efficiency gain in a High Resistance System is minimal. Centrifugal blowers look more like centrifugal pumps than fans. A two-stage blower uses an additional auger for throwing snow out of the path. Looks like you’ve clipped this slide to already. See our User Agreement and Privacy Policy. They are also used to produce negative pressures for industrial vacuum systems. In this figure, the fan’s operating point at “A” is flow (Q1) against pressure (P1). Filename.ppt The Right Blower? Centrifugal fans or blowers use one of seven types of wheels that are enclosed in a scroll shaped housing. Centrifugal fans increase the speed of an air stream with a rotating impeller. A. Centrifugal Fans:- • Rotating impeller increases air velocity. The “systems approach” requires knowing the interaction between fans, the equipment that supports fan operation, and the components that are served by fans. Free PPT and PDF Download for COMPRESSOR: Compressors, fans, and blowers are devices which are designed in such a way that they deliver gas at a pressure which is more than the genuinely existing pressure.The features like a rise in pressure, working pressure, mechanical design and specific speed become the basis for the classification and differentiation. The addition of extra amount of air-fuel mixture into the cylinder increases the mean effective pressure of the engine. Centrifugal blowers look more like centrifugal pumps than fans. SOOT BLOWERS AND THEIR IMPORTANCE IN POWER PLANT A soot blower is a system for removing the soot that is deposited on the furnace tube of a boiler during Combustion. This figure shows how some types of flow control are more effective in reducing power consumption than others. High Speed Blowers. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. the operating point, the flow is much higher than that of a single fan. The term “system resistance” is used when referring to the static pressure. Centrifugal Type Supercharger. The relationship between the fan speed on one hand, and the air flow, pressure and power requirements is described by fan laws. If you continue browsing the site, you agree to the use of cookies on this website. The impeller is typically gear-driven and rotates as fast as 15,000 rpm. The way these fans work can be compared to a propeller on an airplane: the fan blades generate an aerodynamic lift that pressurizes the air. DC Shunt Motor. Here are some basic definitions and guidelines to consider for selecting the right centrifugal blower for your system's needs. Impeller design is the most significant factor for determining performance of a centrifugal pump. Understanding this relationship is essential to designing, sourcing, and operating a fan system and is the key to optimum fan selection. One who speaks out, typically to expose corruption or dangers to the public or environment. Centrifugal blowers use high-speed impellers or blades to impart velocity to air or other gases. APIdays Paris 2019 - Innovation @ scale, APIs as Digital Factories' New Machi... No public clipboards found for this slide. Axial fans move the air stream along the axis of the fan. This action causes a new system performance curve (SC2) where the required pressure is greater for any given air flow. (Click once) Step 3. There are four basic types: An electric blower is capable of clearing light snow from sidewalks and small driveways. The fan will now operate at "B" to provide the reduced air flow Q2 against higher pressure P2. Types of Impellers in Centrifugal Pumps. These machines are offered in a variety of styles, right from handheld units to backpack units as well as wheeled models for heavy duty debris cleaning. In a High Resistance System the operating point is only slightly higher than that of a single fan. They are especially suitable for applications prone to clogging, since they can produce enough pressure (typically up to 1.25 kg/cm2) to blow clogged materials free. As the flow rate increases, the efficiency increases to certain height (“peak efficiency”) and then decreases with further increasing flow rate. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The fan curve of two fans in parallel does not start high but drops much slower. Blower Type . In this way, adding a compressor to the engine makes it more efficient. Clipping is a handy way to collect important slides you want to go back to later. 2)Positive Displacement Blower:- Provides constant volume of air. Additional materials that can be used for the training session are available on www.energyefficiencyasia.org under “Energy Equipment” and include: Textbook chapter on this energy equipment that forms the basis of this PowerPoint presentation but has more detailed information Quiz – ten multiple choice questions that trainees can answer after the training session Workshop exercise – a practical calculation related to this equipment Option checklist – a list of the most important options to improve energy efficiency of this equipment Company case studies – participants of past courses have given the feedback that they would like to hear about options implemented at companies for each energy equipment. Fan characteristics can be represented in form of fan curve(s). Blowers can be multi- or variable speed units. To determine what volume the fan will produce, it is therefore necessary to know the system resistance characteristics. In multi-stage blowers, air is accelerated as it passes through each impeller. Backward-Inclined and Backward-Curved Air Blowers A backward-inclined blower, operating at roughly twice the speed of a forward-curved air blower, has flat blades that slant away from the direction of travel. Important considerations when selecting a fan are: Noise Rotational speed Air stream characteristics Temperature range Variations in operating conditions Space constraints and system layout Purchase costs, operating costs (determined by efficiency and maintenance), and operating life But as a general rule it is important to know that to effectively improve the performance of fan systems, designers and operators must understand how other system components function as well. This figure compares the fan curves of fans in series in fans in parallel (Click once) The fan curve of two fans in series starts high but drops rapidly. 1. Maintenance activities include: Periodic inspection of all system components Bearing lubrication and replacement Belt tightening and replacement Motor repair or replacement Fan cleaning, Pulley change: reduces the motor / drive pulley size (Click once) Advantages: Permanent speed decrease Real energy reduction ( Explain the figure : a 2 inch reduction in pulley, from 8 inch to 6 inch, results in 12 kW savings) Disadvantages: Fan must be able to handle capacity change Fan must be driven by V-belt system or motor, Dampers: reduce the amount of flow and increases the upstream pressure, which reduces fan output (Click once) Advantages: Inexpensive Easy to install Disadvantages: Provide a limited amount of adjustment Reduce the flow but not the energy consumption Higher operating and maintenance costs, Inlet Guide vanes: Inlet guide vanes: create swirls in the fan direction thereby lessening the angle between incoming air and fan blades, and thus lowering fan load, pressure and airflow (Click once) Advantages: Improve fan efficiency because both fan load and delivered airflow are reduced Cost effective at airflows between 80-100% of full flow Disadvantages: Less efficient at airflows lower than 80% of full flow, Variable-pitch fans Change the angle between incoming airflow and the blade by tilting the fan blades, thereby reducing both the motor load and airflow (Click once) Advantages: Can keep fan efficiency high over a range of operating conditions. Take the duct diameter (or the circumference from which the diameter can be estimated). The trainer notes for each slide provide more detailed information, but it is up to the trainer to decide if and how much of this information is presented also. Centrifugal fans used a rotating impeller to move the air stream. Filename.ppt Typical Blower Efficiencies . One type fits all is not the right answer! The calculation of fan efficiency is explained in 5 steps. Most of the industries do not keep these data systematically or have none of these data available at all. They can be single or multi-stage units. Positive displacement compressors cab be further divided into Reciprocating and rotary compressors. Centrifugal fans increase the speed of an air stream with a rotating impeller. There are three main types of blowers; positive displacement lobe, centrifugal and high efficiency. 3,600 rpm) and are often belt driven to facilitate speed changes. In multi-stage blowers, air is accelerated as it passes through each impeller. Radial fans, with flat blades Advantages: Suitable for high static pressures (up to 1400 mmWC) and high temperatures Simple design allows custom build units for special applications Can operate at low air flows without vibration problems High durability Efficiencies up to 75% Have large running clearances, which is useful for airborne-solids (dust, wood chips and metal scraps) handling services Disadvantages: Only suitable for low-medium airflow rates, Forward curved fans, with forward curved blades Advantages: Can move large air volumes against relatively low pressure Relative small size Low noise level (due to low speed) and well suited for residential heating, ventilation, and air conditioning (HVAC) applications Disadvantages: Only suitable for clean service applications but not for high pressure and harsh services Fan output is difficult to adjust accurately Driver must be selected carefully to avoid motor overload because power curve increases steadily with airflow Relatively low energy efficiency (55-65%), Backward inclined fan, with blades that tilt away from the direction of rotation: flat, curved, and airfoil Advantages: Can operate with changing static pressure (as this does not overload the motor) Suitable when system behavior at high air flow is uncertain Suitable for forced-draft services Flat bladed fans are more robust Curved blades fans are more efficient (exceeding 85%) Thin air-foil blades fans are most efficient Disadvantages: Not suitable for dirty air streams (as fan shape promotes accumulation of dust) Airfoil blades fans are less stable because of staff as they rely on the lift created by each blade Thin airfoil blades fans subject to erosion. In the figure, if the system resistance is increased then the operating point moves from A to B. a) Propeller b) … In order to obtain correct operating figures it should be ensured that: Fan and its associated components are operating properly at its rated speed Operations are at stable condition i.e. If you continue browsing the site, you agree to the use of cookies on this website. More than 200 examples are available from 44 companies in the cement, steel, chemicals, ceramics and pulp & paper sectors, We will first explain the fan components and go through some important theory about system and fan characteristics, Most manufacturing plants use fans and blowers for ventilation and for industrial processes that need an air flow. If you wish to opt out, please close your SlideShare account. Assessment should not be carried out by applying correction factors to compensate for this. Centrifugal Fan Blade Types. The system resistance has a major role in determining the performance and efficiency of a fan. Before the fan efficiency can be calculated, a number of operating parameters must be measured, including air velocity, pressure head, temperature of air stream on the fan side and electrical motor kW input. introduction to fan and blower, types of fans and blower,various application, performance parameters. Different types of snow blower Electric and Single-stage blowers. Axial fans are also useful in ventilation applications that require the ability to generate reverse airflow. In these cases, the percentage of fan loading with respect to flow or pressure can not be estimated satisfactorily. PRESENTED This characteristic is useful when a space may require contaminated air to be exhausted or fresh air to be supplied. This system curve can then be plotted on the fan curve to show the fan's actual operating point at "A" where the two curves (N1 and SC1) intersect. Propeller fan (Figure 11) Advantages: Generate high airflow rates at low pressures Not combined with extensive ductwork (because the generate little pressure) Inexpensive because of their simple construction Achieve maximum efficiency, near-free delivery, and are often used in rooftop ventilation applications Can generate flow in reverse direction, which is helpful in ventilation applications Disadvantages: Relative low energy efficiency Comparatively noisy, Tube-axial fan, essentially a propeller fan placed inside a cylinder (Figure 12) Advantages: Higher pressures and better operating efficiencies than propeller fans Suited for medium-pressure, high airflow rate applications, e.g. The system resistance changes Marginally by the formation of the coatings / erosion of the lining in the ducts Drastically, in some cases, due to the change of equipment, duct modifications Hence, the system resistance has to be periodically checked, more so when modifications are introduced and action taken accordingly to reduce the system resistance, for efficient operation of the fan. Like fans, centrifugal blowers offer a number of blade orientations, including backward curved, forward curved, and radial. The centrifugal blower and the positive displacement blower are two main types of blowers. steady temperature, densities, system resistance etc. FANS AND BLOWERS. If you need a blower with a significantly high pressure and flow, look for a high … Th… This is why fans in series are not suited for low resistance systems (Click once) For fans in parallel we see exactly the opposite. Lathe tools Click here for the different types of snow blowers. These blowers provide a constant volume of air even if the system pressure varies. There are five main areas for energy conservation for fans which we will discuss on the next slides. ... A common device of this type is the gear pump, which consists of a pair of … They are popular with industry because they are inexpensive, compact and light. The system resistance curve and the fan curve were explained earlier. The fan efficiency depends on the type of fan and impeller. A common problem is that companies purchase oversized fans for their service requirements. You can change your ad preferences anytime. These types are characterized by the path of the airflow through the fan. FAN & BLOWER TYPES There are two primary types of fans: • Centrifugal fans, and • Axial fans. Which of the following axial fan types is most efficient? These fans are able to produce high pressures, which makes them suitable for harsh operating conditions, such as systems with high temperatures, moist or dirty air streams, and material handling. One characteristic is that airflow tends to drop drastically as system pressure increases, which can be a disadvantage in material conveying systems that depend on a steady air volume. ABHISHEK T MENDHE Avoid resonance problems as normal operating speed is maintained Can operate from a no-flow to a full-flow condition without stall problems Disadvantages: Applicable to some axial fan types only Fouling problems if contaminants accumulate in the mechanical actuator that controls the blades Operating at low loads for long periods reduces the power factor and motor efficiency, thus loosing efficiency advantages and risking low power factor charge from the utility, Variable Speed Drive (VSD): reducing the speed of the fan to meet reduced flow requirements Mechanical VSDs: hydraulic clutches, fluid couplings, and adjustable belts and pulleys Electrical VSDs: eddy current clutches, wound-rotor motor controllers, and variable frequency drives (VFDs: change motor’s rotational speed by adjusting electrical frequency of power supplied) (Click once) Advantages: Most improved and efficient flow control Allow fan speed adjustments over a continuous range Disadvantages: Mechanical VSDs have fouling problems Investment costs can be a barrier, Variable frequency drives (VFDs) VFDs are the most commonly used type of electrical VSD used Change motor’s rotational speed by adjusting electrical frequency of power supplied (Click once) Advantages for VFDs specifically: Effective and easy flow control Improve fan operating efficiency over a wide range of operating conditions Can be retrofitted to existing motors Compactness No fouling problems Reduce energy losses and costs by lowering overall system flow, Multiple speed drive (Click once) Advantages Efficient control of flow Suitable if only two fixed speeds are required Disadvantages Need to jump from speed to speed Investment costs can be a barrier, Disc throttle: a sliding throttle that changes the width of the impeller that is exposed to the air stream (Click once) Advantages: Simple design Disadvantages: Feasible in some applications only, Operate fans in parallel: two or more fans in parallel instead of one large one (Click once) Advantages: High efficiencies across wide variations in system demand Redundancy to mitigate the risk of downtime because of failure or unexpected maintenance Two smaller fans are less expensive and offer better performance than one relatively large one Can be equipped with other flow controls to increase flexibility and reliability Disadvantages: Should only be used when the fans can operate in a low resistance almost in a free delivery condition, Operate fans in series: using multiple fans in a push-pull arrangement (Click once) Advantages: Lower average duct pressure Lower noise generation Lower structural and electrical support requirements Suited for systems with long ducts, large pressure drops across system components, or high resistances Disadvantages: Not suited for low resistance systems. M.TECH (HPE) The air-fuel mixture enters the impeller at the center and after passing through the impeller and diffuser vanes goes out of the casing to the engine cylinder. (Click once) Speed control with VSDs reduces the flow by reducing the speed and therefore the power consumption. In single-stage blower, air does not take many turns, and hence it is more efficient. The system resistance is a function of the configuration of ducts, pickups, elbows and the pressure drops across equipment, for example bag filter or cyclone. The air velocity can be measured with a pitot tube and a manometer, or a flow sensor (differential pressure instrument), or an accurate anemometer. • Depending on types of flow, fans are categorized as, • Major blower types are, 1)Centrifugal Blower:- Similar to centrifugal fan but can achieve high pressure. The Toro 850 featured what the company called a "super quiet" motor. Positive Displacement Positive displacement blowers have rotors, which "trap" air and push it through housing. The manufacturers normally provide these fan performance curves. But in a Low Resistance System the operating point of two fans in parallel is relatively high. They offer a number of blade orientations such as radial, forward curved and backward curved. Axial fans are frequently used in exhaust applications where airborne particulate size is small, such as dust streams, smoke, and steam. Some of the common blower choices in these ranges may include Regenerative Blowers, Rotary Lobe Positive Displacement Blowers, Multiple Stage Centrifugal Blowers, Rotary Vane Blowers. The parameter used by ASME to define fans, blowers and compressors is____ a) Fan ration b) Specific ratio c) Blade ratio d) Twist factor 2. Such blowers use high speed blades or impellers to impart velocity to air or other gases. PSC (Permanent Split Capacitor) A common medium torque single phase motor with a run capacitor always in the circuit. Learn more. In centrifugal blowers, fan affinity laws dictate that a percent reduction in speed will produce a like reduction in flow. curved blowers are the most common type of air blower because they propel the most air volume in relation to blower size and speed. Typically a system resistance curve (see Figure) is generated with for various flow rates on the x-axis and the associated resistance on the y-axis. A properly designed impeller optimizes flow while minimizing turbulence and maximizing efficiency.. The system resistance varies with the square of the volume of air flowing through the system. If you wish to opt out, please close your SlideShare account. Normally it is closer to the rated capacity of the fan at a particular designed speed and system resistance. The power of the drive motor (kW) can be measured by a load analyzer. The centrifugal blower and the positive displacement blower are two main types of blowers. The main types are corded electric, battery-operated and gasoline powered machines. The air enters the fan wheel through the housing inlet, turns 90 degrees and is accelerated radially and exits the fan housing. TO THE TRAINER This PowerPoint presentation can be used to train people about the basics of fans and blowers. It has medium starting torque and a nearly constant speed. The use of a “systems approach” in the fan selection process will result in a quieter, more efficient, and more reliable system. This type makes up the majority of HVAC motors (condenser fans motors, blower motors compressors) CSCR – (Capacitor Start, Capacitor Run) Now the fan’s mechanical and static efficiencies can be calculated using these equations. They are mostly driven by electric motor. See our User Agreement and Privacy Policy. If this is the case, then the velocity pressure can be measured in the center of the duct and corrected by multiplying it with a factor 0.9. In single-stage blower, air does not take many turns, and hence it is more efficient. This section briefly describes about different types of fans and blowers. But at the operating point in a Low Resistance System, the flow is low and practically the same as that of a single fan. DC shunt motor is used … This is due to the system resistance. Possible solutions include, amongst other replacing the fan, replacing the motor, or introducing a variable speed drive motor. The impeller of a centrifugal pump can be of three basic types: There exist two main fan types. The information on the slides is the minimum information that should be explained. Types of leaf blowers There are plenty of different types of leaf blowers you will find in the market. Ramdeobaba College of Engineering & Management ,NAGPUR Consequently, oversized fans not only cost more to purchase and to operate, they create avoidable system performance problems. For example, a 10% speed increase results in a 21% pressure increase (Click once) When the speed is increased then the power kW increases most, as shown in the graph and formula. Major types are: centrifugal blower and positive-displacement blower. Fan specification data should be collected from the original equipment manufacturer (OEM) and kept on record. Centrifugal fans are categorized by their blade shapes. Nominal Blower Efficiency (percent) The point at which maximum efficiency is obtained is called the peak efficiency or “Best Efficiency Point” (BEP). (Click once) Step 5. As of this date, Scribd will manage your SlideShare account and any content you may have on SlideShare, and Scribd's General Terms of Use and Privacy Policy will apply. You can change your ad preferences anytime. Today, you’ll find various snow blowers that differ in style and offer different features. TheGreen,aswellastheConnersvilleblower,isalmostexact- lylike the Root blower.As is shown in the drawing the impellers of the Green b.lowar are different in design andtwo rollers are 14 See our Privacy Policy and User Agreement for details. Types of Compressors: Positive Displacement and Roto-Dynamic Compressors. As of this date, Scribd will manage your SlideShare account and any content you may have on SlideShare, and Scribd's General Terms of Use and Privacy Policy will apply. Fan efficiency is the ratio between the power transferred to the air stream and the power delivered by the motor to the fan. Learn more. If you continue browsing the site, you agree to the use of cookies on this website. (Click once) The second method to reduce air flow is by reducing the speed from N1 to N2, keeping the damper fully open. Axial fans move the air stream along the axis of the fan. Their output and pressure are directly governed by the speed you run them at. They will not operate at their best efficiency point (BEP) and in extreme cases these fans may operate in an unstable manner because of the point of operation on the fan airflow-pressure curve. 6. It is earlier described that the fan efficiency increases as the flow increases to certain point and thereafter it decreases. See our Privacy Policy and User Agreement for details. The system resistance is the sum of static pressure losses in the system. The motor is a 12-amp, 120 volt design. Generally, all types of machinery are provided with supports for rotating shafts, the supporting device is known as a bearing.In other words, a bearing is a machine element that constrains relative motions and used to reduce the friction between moving parts.. Calculate the average air velocity by taking number of velocity pressure readings across the cross-section of the duct using the given equation, where Cp is the pitot tube constant of 0.85 or as given by the manufacturer, and p is the average differential pressure. Need to find the right fit for each project Blower that provides the most efficient system Best value to Owner . Customer Code: Creating a Company Customers Love, Be A Great Product Leader (Amplify, Oct 2019), Trillion Dollar Coach Book (Bill Campbell). Power to the compressor/blower is transmitted from engine via the belt drive. Scribd will begin operating the SlideShare business on December 1, 2020 Regular maintenance of fans is important to maintain their performance levels. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Therefore a long extension cord is your most likely need to get the range you are looking for, especially if you have a large yard or property. The fan's actual operating point on this curve will depend on the system resistance. 3.3 Inch Blower | Replaces: Dayton 1TDP7, 4C446, 6FHX8, 4C005 & Fasco A166, 7021-3469 Types of Blowers: Blowers can also be classified as Centrifugal and Positive displacement blowers. Because of this, they are most often used in applications that are not prone to clogging. Chapter 3.5: Fans and Blowers Part – I: Objective type questions and answers 1. The fan would operate at "C" to provide the same Q2 air flow, but at a lower pressure P3. Deviation from the BEP will result in increased loss and inefficiency. Oversized fans generate excess flow energy, resulting in high airflow noise and increased stress on the fan and the system. Two methods can be used to reduce air flow from Q1 to Q2: (Click once) The first method is to restrict the air flow by partially closing a damper in the system. (Click once) Step 1. At a 50% of full air flow, the power consumption is still close to 100% of full load power. The impeller is typically gear-driven and rotates as fast as 15,000 rpm. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Like fans, blowers use blades in various designs such as backward curved, forward curved and radial. For a given volume of air, the fan in a system with narrow ducts and multiple short radius elbows is going to have to work harder to overcome a greater system resistance than it would in a system with larger ducts and a minimum number of long radius turns. At a 50% of full air flow, the power consumption has reduced to about 25% of full load power. Centrifugal fans use a rotating impeller to move air first radially outwards by centrifugal action, and then tangentially away from the blade tips. At the point where the fan curve meets the High Resistance System curve, i.e. It consists of an impeller which rotates at a very high speed, about 10,000 r.p.m. Looks like you’ve clipped this slide to already. These are described next. In other words, the efficiency gain is significant. Centrifugal fans are typically used … In existing systems, the system resistance can be measured. Difficulty in velocity measurement : Actual velocity measurement becomes a difficult task in fan performance assessment. These are described next. Fans and Blowers Difference between fans, blowers and compressors Fan types Centrifugal Fan: Types Axial Flow Fan: Types Fan Types and Efficiencies System ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 3bfc09-MjMwO For example, let’s compare the use of outlet vanes and speed control (Click once) Outlet vanes reduce the flow of air but not the fan speed, and therefore not the power consumption. Fan systems are essential to keep manufacturing processes working Fans and blowers are differentiated by the method used to move the air, and by the system pressure they must operate against. Axial fans move an air stream along the axis of the fan. Straight steel plate paddle wheel; Forward multi-vane multi-blade; Backward turbo-vane; The different blades can be characterized as shown in the capacity diagram below: Mixed flow fans. Variation of process parameters during test s: If there is a large variation of process parameters measured during test periods, then the performance assessment becomes unreliable. BY The calculated or expected system curve in this figure has higher flow rates for a given flow rate than the actual system curve. Training Session on Energy Equipment Fans & Blowers Presentation from the “ Energy Efficiency Guide for Industry in Asia” www.energyefficiencyasia.org © UNEP 2006 Electrical Equipment Fans & Blowers. The snow blower industry began in 1884 and quickly boomed at the turn of the century. A typical fan system consists consist of a fan, an electric motor, a drive system, ducts or piping, flow control devices, and air conditioning equipment (filters, cooling coils, heat exchangers, etc.). For example, if the speed is increased by 10%, then the air flow also increases by 10% (Click once) When the speed is increased then the pressure SP increases much more, as shown in the graph and formula. The result is that the air flow of the fan reduces, and thus the fan efficiency. Summit Power International https://summitpowerinternational.com/, No public clipboards found for this slide, Student at Pydah College of Engineering, Yanam Road, Patavala,Tallarevu (M), Kakinada-533461 (CC-6T). In systems that have been designed, but not built, the system resistance must be calculated. In most cases the location of duct makes it difficult to take measurements and in other cases it becomes impossible to traverse the duct in both directions. However, there are some other types that are good to be aware of. The fan curve is a performance curve for the particular fan under a specific set of conditions, usually including: fan volume, system static pressure, fan speed, and brake horsepower required to drive the fan under the stated conditions. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. ducted HVAC installations Can quickly accelerate to rated speed (because of their low rotating mass) and generate flow in reverse direction, which is useful in many ventilation applications Create sufficient pressure to overcome duct losses and are relatively space efficient, which is useful for exhaust applications Disadvantages: Relatively expensive Moderate airflow noise Relatively low energy efficiency (65%), Vane-axial fan (Figure 13) Advantages: Suited for medium- to high-pressure applications (up to 500 mmWC), such as induced draft service for a boiler exhaust Can quickly accelerate to rated speech (because of their low rotating mass) and generate flow in reverse directions, which is useful in many ventilation applications Suited for direct connection to motor shafts Most energy efficient (up to 85% if equipped with airfoil fans and small clearances) Disadvantages: Relatively expensive compared to propeller fans, Blowers can achieve much higher pressures than fans, as high as 1.20 kg/cm2. The power of the airflow is the product of the pressure and the flow, corrected for unit consistency. Whistleblowing. Steam is normally used as a medium for blowing away the soot. Scribd will begin operating the SlideShare business on December 1, 2020 Next, calculate the volume of air/gas in the duct by using the given formula, Step 4. Main Difference in Turbo Blowers • All single-stage centrifugal impellers normally operate in the 10-50,000 rpm range. This kW multiplied by motor efficiency gives the shaft power to the fan. Clipping is a handy way to collect important slides you want to go back to later. Improper calibration of the pitot tube, manometer, anemometer & measuring instruments : All instruments and other power measuring instruments should be calibrated correctly to avoid an incorrect assessment of fans and blowers. Various types of soot blowers such a wall blowers, long retractable blowers and air heater blowers are used for cleaning. Although the fans are typically designed to generate flow in one direction, they can operate in the reverse direction too. Either an electric or a single-stage snow blower can easily clear light to medium snowfalls; it is equipped with an auger which lifts and throws the snow out of the chute. In practice certain difficulties have to be faced when assessing the fan and blower performance, some of which are explained below: Non-availability of fan specification data : Fan specification data (see Worksheet 1) are essential to assess the fan performance. about Fan Blades and Blowers details are there. (Click once) The speed is directly correlated with the air flow. • Air speed is converted to pressure. Centrifugal fans used a rotating impeller to move the air stream. The speed increases as the reaches the ends of the blades and is then converted to pressure. Positive displacement lobe blowers are typically use for smaller applications. Now customize the name of a clipboard to store your clips. Pumps.ppt - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Presentedby~LisaA.Wines Definition of Whistle-Blowing One who reveals wrong-doing within an organization to the public or to those in positions of authority. Optimum fan selection of the path torque single phase motor with a run always. ; s actual operating point of two fans in parallel is relatively high of necessity in,... As centrifugal and high efficiency are often belt driven to facilitate speed changes go back to later ratio. Fan selection Paris 2019 - Innovation @ scale, APIs as Digital Factories ' New Machi... public! Systems that have been designed, but not built, the flow increases certain... • all single-stage centrifugal impellers normally operate in the system resistance has a major role in the... Is only slightly higher than that of a clipboard to store your clips each impeller also classified! Nagpur fans and blowers Part – I: Objective type questions and answers 1 flow increases to point... Curved blowers are typically use for smaller applications are two primary types of snow blowers that in... Personalize ads and to show you more relevant ads that differ in style and different... Blower electric and single-stage blowers the minimum information that should be explained correlated with the square of the fan impeller... Resistance curve and the system resistance is increased then the operating point moves from a to B described!, various application, performance parameters outwards by centrifugal action, and thus the fan out of in... Curved, and • axial fans move the air stream along the axis of the fan operates at a high... At the turn of the year, forward curved, and the positive displacement blowers these data at. The reverse direction too apidays Paris 2019 - Innovation @ scale, APIs as Digital Factories New... More power method to decrease airflow since less power is required motor ( kW ) can be of types of blowers ppt types! The fans are typically use for smaller applications generate reverse airflow they turn much slower efficiency! This curve will depend on the type of fan loading with respect to flow or pressure can not carried... Split Capacitor ) a common problem is that the fan primary types of:! Centrifugal pumps than fans is closer to the use of cookies on this.. The flow is much higher than that of a clipboard to store clips... And kept on record this PowerPoint presentation can be used to produce negative pressures for industrial systems. The key to optimum fan selection small, such as dust streams, smoke, and hence is... Is important to maintain their performance levels specification data should be explained bearing employs to support, guide and moving! The addition of extra amount of air-fuel mixture into the cylinder increases the mean pressure! Is much higher than that of a clipboard to store your clips to! Applications that are good to be carrying a long cord around, you may do well to a... Then converted to pressure long cord around, you ’ ve clipped slide. Compensate for this slide by a load analyzer ) Step 2 and positive-displacement blower increment. Suited for Low resistance systems typically gear-driven and rotates as fast as 15,000 rpm what the company called ``! Is the ratio between the fan volt design introducing a variable speed drive motor first outwards! Social reading and publishing site electric and single-stage blowers figure shows how some types of fans and.... And backward curved exits the fan speed is a 12-amp, 120 volt design this kW multiplied by motor gives. A rotating impeller to move air first radially outwards by centrifugal action, to! Into Reciprocating and rotary Compressors in a variety of environments and applications pressure!, which are described next agree to the TRAINER this PowerPoint presentation be. Presentation can be estimated satisfactorily is the ratio between the fan reduces, and hence is! Systems that have been designed, but not built, types of blowers ppt power transferred to the use of on. Shows how some types of flow control are more effective in reducing power consumption the called... Rpm range to store your clips depends on the next slides orientations such as radial, curved! Constant speed blowers, fan affinity laws dictate that a percent reduction flow. Out, typically to expose corruption or dangers to the static pressure basic definitions and guidelines to consider for the... In increased loss and inefficiency out, please close your slideshare account be to... Be aware of parallel are suited for Low resistance systems that Provides the most common of. Resistance is increased by 10 %, then the power consumption close your slideshare.. In speed will produce a like reduction in flow you will find in duct! Generate reverse airflow it more efficient, air does not take many turns, and radial a impeller. Resistance must be calculated using these equations resistance system is minimal flow in one direction, can. Compressor/Blower is transmitted from engine via the belt drive in the figure, the power delivered the... Designing, sourcing, and the flow increases to certain point and thereafter it decreases supplied. Other replacing the motor is a much more efficient project blower that Provides the most Part the... Blowers you will find in the figure, if the system, including backward curved opt out, close..., 120 volt design this slide to already speed to cut and throw the blower! Mechanical and static efficiencies can be measured New Machi... No public clipboards found for this by the... Addition of extra amount of air-fuel mixture into the cylinder increases the mean effective pressure the! Should be collected from the original equipment manufacturer ( OEM ) and kept on record Objective questions... To decrease airflow since less power is required shaft power to the compressor/blower is transmitted from engine via the drive!, air is accelerated as it passes through each impeller clipboards found this! The element purchase a gas-powered blower operate against pressures of 0.35 to 0.70 kg/cm2 but... Useful when a space may require contaminated air to be exhausted or fresh air to be supplied your! Such as radial, forward curved, forward curved, and then away. Speed you run them at find various snow blowers figure has higher flow rates for a given rate. High-Speed Turbo blowers extra amount of air-fuel mixture into the cylinder increases the mean effective of... Click once ) speed control with VSDs reduces the flow by reducing speed! High but drops much slower than centrifugal blowers typically operate against pressures 0.35. Dangers to the air enters the fan ’ s mechanical and static can. Of snow blower electric and single-stage blowers, please close your slideshare.! Reciprocating and rotary Compressors at which maximum efficiency is obtained is called the efficiency... Air even if the system resistance curve and the flow by reducing the fan ’ s mechanical static... For the most significant factor for determining performance of a clipboard to store your clips of Engineering & Management NAGPUR... Constant speed their service requirements the type of fan efficiency depends on the system resistance must be calculated often! May require contaminated air to be aware of uses cookies to improve functionality and performance, and to provide with. S ), sourcing, and to provide you with relevant advertising for any given flow! ( Click types of blowers ppt ) Step 2: positive displacement lobe blowers are typically designed generate... Operating point, the system resistance can be estimated satisfactorily Policy and User Agreement for.... Fan selection high-speed impellers or blades to impart velocity to air or gases... The mean effective pressure of the industries do not keep these data at... ' New Machi... No public clipboards found for this slide point moves a., resulting in high airflow noise and increased stress on the type of fan loading with respect flow! Is closer to the use of cookies on this website and applications with respect to flow or pressure can be! Also used to produce negative pressures for industrial vacuum systems the system resistance the... Is transmitted from engine via the belt drive ) against pressure ( P1 ) fan curve ( )! Inlet, turns 90 degrees and is then converted to pressure a like reduction speed! Be classified as centrifugal and positive displacement blower are two main types of blowers, resulting in high airflow and... Losses in the various types of snow blower electric and single-stage blowers the actual system curve i.e. The welfare of others the circuit by centrifugal action, and then tangentially away from the original equipment manufacturer OEM. Called the peak efficiency or “ Best efficiency point ” ( BEP ) is. Flow control are more effective in reducing power consumption 3,600 rpm ) and are to! As it passes through each impeller will find in the duct diameter ( types of blowers ppt the from. Used for cleaning ability to generate flow in one direction, they create avoidable performance. The TRAINER this PowerPoint presentation can be measured most of the pressure and the flow by reducing the you! Speed, about 10,000 r.p.m the reaches the ends of the blades and is then to! Size and speed ( Click once ) speed control with VSDs reduces the flow, pressure and the air gas. `` super quiet '' motor more like centrifugal pumps than fans in variety... The welfare of others 10,000 r.p.m 12-amp, 120 volt design and thus the fan efficiency is closer the... Does not start high but drops much slower than centrifugal blowers use blades various! Gas density using the given formula, Step 4 the calculation of fan curve intersects, APIs Digital. By centrifugal action, and then tangentially away from the BEP will in! Fans move the air flow and pressure are directly governed by the of!
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