2025 Taipei Automation Industry Exhibition

How to Choose a Suitable Centrifugal Blower?

2023-09-04

-What is a Centrifugal Blower? -Centrifugal Blower Main Application -How To Choose a Suitable Centrifugal Blower? -Understanding Fan Performance Curves -Calculating CFM of the Blower -Centrifugal Blower Discharge Position: Duct and Direction -Conclusions ---------------------------------------- Choosing the right centrifugal blower is critical to ensuring optimal performance of ventilation and air handling systems. Centrifugal blowers are widely used in various industries and places, including automotive, chemical, food processing, kitchen, boiler, UV dryer, agriculture, HVAC, mining, pharmaceuticals, and power generation. As one of the leading centrifugal blower manufacturers in Taiwan, Air Deviser will discuss the factors that you need to consider when choosing a centrifugal blower. When it comes to choosing a centrifugal blower, it is crucial to understand what it is, its main applications, factors to consider when choosing one, understanding the fan performance curve and discharge position. What is a Centrifugal Blower? A centrifugal blower is a mechanical device that uses an impeller to generate airflow. It operates by drawing air into the center of the impeller and then expelling it outwards in a direction at an angle to the incoming fluid. Centrifugal blowers are suitable for specific directed cooling. There are four main types of them: forward-curved, backward-curved, radial, and airfoil. Photo Source: See page for author, Public domain, via Wikimedia Commons Centrifugal Blower Main Application Centrifugal blowers have two main applications - exhaust and airflow. ● Exhaust Centrifugal blowers remove air or gas from an enclosed space, such as a room or building. Therefore, they are commonly used for exhaust applications, where they are used to remove contaminants or exhaust gases from a specific area or building. In industrial settings, these fans are used to exhaust hazardous gases, fumes, or vapors generated during the manufacturing process. ● Airflow Centrifugal blowers are also used for airflow applications, where they are used to move air from one location to another. In HVAC systems, these blowers are used to circulate air throughout a building, while in industrial settings, they are used for process ventilation. Air recirculation is a common requirement in numerous industries that use burners and boilers that produce energy and heat. For these industries, centrifugal blowers are essential for ensuring fresh air flows into the system and maintaining sufficient oxygen levels for proper fuel combustion. How To Choose a Suitable Centrifugal Blower? When choosing a centrifugal blower, several factors need to be considered. These include the airflow rate, blower static pressure, speed requirement, and intended fan duty. Let's take a look at these factors. 1. Air Flow The airflow rate is the volume of air that the fan can move in a given amount of time. This is typically measured in cubic feet per minute (CFM) and is determined by the size of the space or system that needs to be ventilated. A blower with a higher CFM rating is required for larger spaces or systems. To choose the right blower, you need to know the airflow requirements of your system. We will talk about how to calculate CFM later. 2. Static Pressure Another important factor to consider when choosing a centrifugal blower is the blower static pressure. This is the amount of pressure that the blower needs to overcome to move air through the system. It is a pressure exerted in all directions in the space in which it is contained, not the direction of the air. High static pressure means that the blower can also air the inside of high-density mounting devices. It is measured in inches of water gauge (WG). To choose the right blower, you need to know the static pressure requirements of your system. This can be calculated by adding the pressure drops in the system. 3. Speed requirement The required speed of the centrifugal blower is also an essential consideration. Higher speeds are needed for larger spaces or systems that require a higher CFM rate. Fan speed is typically measured in the number of revolutions per minute (RPM). It is important to choose a blower with the correct speed to ensure optimal performance. 4. Intended Fan Duty Finally, you need to consider the intended duty of the centrifugal blower. Duty refers to the continuous operating conditions that the blower will be exposed to. This includes factors such as temperature, humidity, and the presence of corrosive or abrasive materials. Choosing a blower with the appropriate duty rating so it will perform optimally under the intended operating conditions. Understanding Fan Performance Curves A fan performance curve is a graph that shows the performance characteristics of a particular blower fan at various operating conditions. Fan performance curves play a key role in selecting the right blower for your application as they help you determine the airflow rate, pressure drop, power consumption, and overall efficiency of the blower. The fan curve graph has three axes: the horizontal bottom axis represents the airflow volume rate in cubic feet per minute (CFM) or cubic meters per second (m3/sec.). The vertical left axis represents the fan's static pressure in inches water gauge (wg), pascals (Pa), or millimeters water gauge. Finally, the vertical right axis represents the fan's brake horsepower (BHP). The intersection between the static pressure (SP) curve and the system curve on the static pressure vs. air volume curve is known as the fan operating point. This is the theoretical static pressure and air volume that your fan should provide for a particular duct system with workstations connected. To obtain accurate fan curves, industrial fan manufacturers carry out tests to determine the static pressure values of the fans and blowers at various air flow volumes. If you require the information to draft your fan curves or want to learn more about the testing process, you can contact the manufacturer directly. Calculating CFM of the Blower CFM = Air Velocity (ft/min) x Cross-Sectional Area (ft²) 1. Determine the blower's air velocity. You can measure it with an anemometer. Alternatively, you can consult the blower's specifications, which may provide the air velocity. 1. Calculate the cross-sectional area of the blower outlet in square feet. You can measure it by finding the diameter of the outlet and using the formula for the area of a circle (A=πr²). 2. Multiply the air velocity by the cross-sectional area. This will give you the blower's airflow rate in cubic feet per minute (CFM). Centrifugal Blower Discharge Position: Duct and Direction The direction of the discharge should also be considered to ensure that the air is moving in the right direction. The ideal discharge position depends on several factors, including the layout of the system, the type of application, and the space available for installation. When determining the discharge position of a centrifugal blower, it is important to consider the direction of rotation, which is determined by the drive side of the blower. For single inlet blowers, the drive side is located on the opposite side of the fan inlet. For double inlet blowers with drives on both sides, the drive side should be located on the same side as the higher-powered drive unit. It is suggested to consult the manufacturer's recommendations and guidelines when selecting the discharge position of a centrifugal blower to ensure optimal performance and efficiency. ▲Our Single outlet with double suction type furnace blowers’ 3-Sectional speed design provides different options to let the fan operate more efficiently. Conclusions Taken together, choosing the right centrifugal blower is crucial to ensure the optimal performance of ventilation and air handling systems. Today we have learned how to choose a suitable centrifugal blower for your business. A centrifugal blower is an essential component in many industries such as the steel and glass industry, that require air or gas movement. Choosing the right blower requires careful consideration of several factors, including the airflow rate, blower static pressure, speed requirement, and intended fan duty. Fan performance curves are an essential tool for selecting the right blower, and the discharge position must be considered during installation. By selecting the appropriate centrifugal blower, you can ensure that it will perform optimally under the intended operating conditions. Air Deviser Industrial is a Taiwan-based company that specializes in air blowers, Sirocco fans, centrifugal blowers, Sirocco fan wheels, and fan impellers. Our products are exported to the global market under our AD brand. We have factories in both China and Vietnam. With over 30 years of experience in the blower industry, we possess strong capabilities in R&D and OEM. We have developed a wide range of blower fans and fan wheels in various sizes to meet the needs of our customers. Want to know more about centrifugal blowers? Still have questions regarding how to choose one? Contact us today to learn more about how we can help you achieve your business goals with our air blowers.

Guide to Centrifugal Blowers

2023-09-04

-What is a Centrifugal Blower? -Working Principles -Types of Centrifugal Blowers -Applications -Advantages and Disadvantages -Conclusions Centrifugal blowers, also known as centrifugal fans, are used in a wide range of industrial applications to move large volumes of air or gas. They are popular in the manufacturing industry, particularly in ventilation systems and air conditioning systems, such as combustion air blowers, furnace blowers, and draft inducers. In this guide, we will explore what centrifugal blowers are, how they work, the different types of centrifugal blowers available, their applications, and their benefits. As one of the leading centrifugal blower manufacturers in Taiwan, Air Deviser Industrial proudly produces centrifugal blowers. We are happy to share knowledge of them with you. What is a Centrifugal Blower? Centrifugal blowers are a type of mechanical device used to move air or gas continuously in a specific direction (normally 90 degrees). Centrifugal blowers consist of an impeller, housing, inlet and outlet ducts, and a drive mechanism (motor). These blowers work on the principle of kinetic energy conversion into potential energy and are widely used in various industrial and commercial applications. The working principle of centrifugal blowers is based on the kinetic energy of the impellers, which is utilized to move the air stream. How Does a Centrifugal Blower Work: Working Principles Air or gas enters the impeller blades of the blower, and as it flows through the blades, it is accelerated toward the outer edges. As the air or gas moves towards the periphery, it encounters the volute casing, which diffuses the air or gas and converts the kinetic energy into pressure static. The air or gas is then expelled through the outlet. Centrifugal blowers are generally used for ducted applications that either extract air through channels or heat exchangers or push air through similar systems. Photo Source: See page for author, Public domain, via Wikimedia Commons Types of Centrifugal Blowers There are four main types of centrifugal blowers: forward-curved, backward-curved, radial, and airfoil. ● Forward-Curved Blowers ▲Check out our forward-curved blowers - AD200A Centrifugal AC blowers, it has high revolution speed (2800rpm ~ 3400rpm). Forward-curved blowers, also known as squirrel cage blowers. They are characterized by their curved blades, which are arranged in a circular pattern around a central hub. These blowers have blades that are curved in the same direction of rotation of the fan wheel. and are best suited for low-pressure applications. They are commonly used in printing machines, kitchen hoods, clean room equipment, packing machines, UV dryers, and air showers, as well as for air suction, discharging, ventilation, furnace blowers, heaters, and HVAC systems for air induction and circulation. ● Backward-Curved Blowers ▲Check out our backward-curved blowers - AD050BCP Combustion Air Blowers Backward-curved blowers have blades that are curved in the opposite direction of rotation. They are more energy-efficient than radial and forward-curved blowers. They are ideal for low air flow and high-pressure applications. Commonly used as a combustion air blower in factories or power plants to burn fuels and gas. They can move large volumes of air at high static pressures. Besides, they are widely used in small boilers, machinery, stove, air conditioner, baking machine, kitchen hoods, laboratories, dust collectors, odor control systems, air handling units, fume extraction systems, emission control systems, heat recovery systems, and many more. ● Radial Blowers ▲Check out our radial blowers - AD279DS Furnace Blowers. Its 3-Sectional speed design provides different options making the fan operate more efficiently. Radial blowers, also known as paddle wheel blowers. Their radial impellers are made up of a series of flat blades that rotate around a central shaft. These blowers have simple designs and blades that are straight and extend radially from the center of the impeller, making them suitable for high-volume applications. ● Airfoil Blowers Airfoil blowers are with airfoil-profiled blades that are commonly used in industries with high temperatures, such as chemical, power generation, and metalworking. These fans are known for their high efficiency and quiet operation, but they are not suitable for dusty environments. Applications of Centrifugal Blowers Centrifugal blowers are used in a wide range of industrial applications. They are commonly used in ventilation systems, HVAC systems, pneumatic conveying systems, and combustion air systems. They are also used in industrial processes such as drying, cooling, air handling, and dust collection. Different types of blowers also have different uses. Advantages and Disadvantages of Centrifugal Blowers Advantages Centrifugal blowers offer several benefits over other types of fans and blowers: ● High efficiency: Centrifugal blowers are highly efficient and can move large volumes of air or gas with minimal power consumption. ● Low noise levels: Centrifugal blowers operate with minimal noise levels, making them suitable for noise-sensitive environments. produce less noise than other types of fans and blowers. ● Low maintenance: These blowers require minimal maintenance due to their robust design and durable construction. This translates to reduced downtime and lower repair costs, making them a cost-effective choice in the long run. ● Cost-effective: Compared to other types of fans and blowers, centrifugal blowers often offer a lower cost of installation and operation. ● Consistent volume delivery: Centrifugal blowers can deliver a large volume of air or gas consistently, with minimal turbulence. This allows for reliable and uniform airflow, ensuring efficient ventilation and cooling in various applications. Disadvantages ● Space limitations: Centrifugal blowers may not be suitable for tight or compact spaces due to their physical size and design. Sufficient space must be available for installation and proper airflow. ● Efficiency at low speeds: Centrifugal blowers may experience reduced efficiency when operated at low speeds. It is important to consider the specific requirements and airflow demands of a system to ensure the blower operates within its optimal range. The advantages of high efficiency, low noise levels, low maintenance, energy efficiency, cost-effectiveness, and consistent volume delivery make centrifugal blowers a popular choice in various industrial and commercial applications. However, it is essential to be mindful of space limitations and efficiency requirements for optimal performance. It is suggested to ask for assistance from an experienced manufacturer like Air Deviser Industrial when choosing one. Conclusions Centrifugal blowers play an important role in various industrial applications. They work based on the principles of centrifugal force and come in four main types: radial, forward-curved, backward-curved, and airfoil. They are commonly used in ventilation systems, HVAC systems, and industrial processes. Centrifugal blowers offer several benefits over other types of fans and blowers. With various types of centrifugal blowers available, each with its own unique design and application. It is important to choose the right blower for your specific needs. Air Deviser Industrial is a blower manufacturer based in Taiwan that specializes in producing air blowers, Sirocco fans, centrifugal blowers, Sirocco fan wheels, and fan impellers. With over 30 years of experience in the blower industry, we have a strong focus on research and development, as well as offering OEM services. Want to know more about centrifugal blowers? Looking for an HVAC solution? Contact our team of experts for further details and technical support! ▲Check out our radial blowers - AD279DS Furnace Blowers. Its 3-Sectional speed design provides different options making the fan operate more efficiently. Radial blowers, also known as paddle wheel blowers. Their radial impellers are made up of a series of flat blades that rotate around a central shaft. These blowers have simple designs and blades that are straight and extend radially from the center of the impeller, making them suitable for high-volume applications. ● Airfoil Blowers Airfoil blowers are with airfoil-profiled blades that are commonly used in industries with high temperatures, such as chemical, power generation, and metalworking. These fans are known for their high efficiency and quiet operation, but they are not suitable for dusty environments. Applications of Centrifugal Blowers Centrifugal blowers are used in a wide range of industrial applications. They are commonly used in ventilation systems, HVAC systems, pneumatic conveying systems, and combustion air systems. They are also used in industrial processes such as drying, cooling, air handling, and dust collection. Different types of blowers also have different uses. Advantages and Disadvantages of Centrifugal Blowers Advantages Centrifugal blowers offer several benefits over other types of fans and blowers: ● High efficiency: Centrifugal blowers are highly efficient and can move large volumes of air or gas with minimal power consumption. ● Low noise levels: Centrifugal blowers operate with minimal noise levels, making them suitable for noise-sensitive environments. produce less noise than other types of fans and blowers. ● Low maintenance: These blowers require minimal maintenance due to their robust design and durable construction. This translates to reduced downtime and lower repair costs, making them a cost-effective choice in the long run. ● Cost-effective: Compared to other types of fans and blowers, centrifugal blowers often offer a lower cost of installation and operation. ● Consistent volume delivery: Centrifugal blowers can deliver a large volume of air or gas consistently, with minimal turbulence. This allows for reliable and uniform airflow, ensuring efficient ventilation and cooling in various applications. Disadvantages ● Space limitations: Centrifugal blowers may not be suitable for tight or compact spaces due to their physical size and design. Sufficient space must be available for installation and proper airflow. ● Efficiency at low speeds: Centrifugal blowers may experience reduced efficiency when operated at low speeds. It is important to consider the specific requirements and airflow demands of a system to ensure the blower operates within its optimal range. The advantages of high efficiency, low noise levels, low maintenance, energy efficiency, cost-effectiveness, and consistent volume delivery make centrifugal blowers a popular choice in various industrial and commercial applications. However, it is essential to be mindful of space limitations and efficiency requirements for optimal performance. It is suggested to ask for assistance from an experienced manufacturer like Air Deviser Industrial when choosing one. Conclusions Centrifugal blowers play an important role in various industrial applications. They work based on the principles of centrifugal force and come in four main types: radial, forward-curved, backward-curved, and airfoil. They are commonly used in ventilation systems, HVAC systems, and industrial processes. Centrifugal blowers offer several benefits over other types of fans and blowers. With various types of centrifugal blowers available, each with its own unique design and application. It is important to choose the right blower for your specific needs. Air Deviser Industrial is a blower manufacturer based in Taiwan that specializes in producing air blowers, Sirocco fans, centrifugal blowers, Sirocco fan wheels, and fan impellers. With over 30 years of experience in the blower industry, we have a strong focus on research and development, as well as offering OEM services. Want to know more about centrifugal blowers? Looking for an HVAC solution? Contact our team of experts for further details and technical support!