centrifugal fan – NIS-CO Blog

NIS-CO Industrial Blowers and Fans

NIS-CO Industrial Blowers & Fans heavy duty fans are designed and selected with the use of modern computer techniques guided by over 100 years of fan engineering experience. Comprehensive testing confirms design decisions. Quality manufacturing standards guarantee long service life.

Industrial Axial & Centrifugal Fans

NIS-CO Industrial Blowers & Fans heavy duty axial and centrifugal fans are designed to handle applications involving erosive and corrosive gases, large capacities, high pressures and temperature extremes.

Typical applications include air cleaning systems, mechanical draft, chemical processes, kiln exhaust, mine ventilation, gas recirculation, sinteric and cryogenic service.

Industrial Blowers & Fans Supplier

Over the years, we supplied fans, blowers and pumps to a wide range of industries and applications. When prolonged service wears fan wheel the logical replacement is a new fan wheel built to the original design. A technical support and sales agent will get a replacement wheel, shaft, bearings, accessories, etc. in the shortest time. He, or she may also recommend changes to extend service life and performance of your machinery, including special materials of construction, explosion-proof and spark-resistant design, variety of coatings and accessories, intended to meet practically any application needs.

“Industrial Quality” Blowers & Fans

NIS-CO Industrial Blowers & Fans air moving products are best known for “industrial quality” assuring reliable performance, relentless dependability and longevity. A staff of specially trained engineers will design a dependable fan that exactly fits customers’ dimensional and performance requirements.

Our Blowers & Fans have a reputation for excellence

Solving difficult and unique air moving problems has earned NIS-CO Industrial Blowers & Fans a reputation for exceptional performance and reliability. Whether it’s energy related or industrial processing or simply moving a precise volume of air, a staff of specially trained engineers will design a dependable fan that exactly fits your performance and dimensional requirements

NIS-CO Industrial Blowers & Fans are sold and serviced by air movement professionals. We can help you explore your needs and will be pleased to work with you.

NIS-CO Industrial Blowers & Fans Corporation is committed to offering a wide variety of fans to meet your needs. Please visit our link, below, to view our capabilites and vast selection of designs. Buffalo Fan sales offices are located throughout North America and manufactured around the world. Wherever you are, “We want you to enjoy doing business with us.” Leave it to NIS-CO Industrial Blowers & Fans to take a perfectly reliable fan and offer a quieter, more efficient, less costly alternative.

Additional information can be found at the NIS-CO Industrial Blowers & Fans company web site http://www.canadianblower.com/ahu/index.html

Oleg Tchetchel
Air Systems Designer
oleg.tchetchel@canadablower.com
NIS-CO Industrial Blowers & Fans
http://canadianblower.com/hvac/index.html
http://canadianblower.com/index.html

NIS-CO Industrial Blowers & Fans Fan Blowers

oleg.tchetchel@canadablower.com

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Attic Fans

While most households are conscious on the convenience brought by nicely ventilated homes, many tend to overlook the attic as one of the areas to be considered. No one finds it comfortable staying for long hours in the closed attic because of the overwhelming heat that builds up in it. For this reason, it is necessary for everyone to consider installing attic ventilation fans in order to cool down the attic’s heat. This can have amazing advantages to the overall household convenience while minimizing energy costs.

Attic fans are, without a doubt, effective tools in bringing ample air exposure to the attic. Without these, all the heat from the sunlight is absorbed into the house even without bringing noticeable change to the temperature. The same thing happens even when the days are not too sunny. All the heat absorbed from its daily encounter with direct sunlight is trapped inside the attic. Not only that, since warm air naturally rises, all the heat in the house goes up to the attic. This can result to a throttling discomfort for anyone who goes in the attic to either look for something in the storage or to bring over new belongings for keeping.

Improper attic ventilation

Improper attic ventilation also has negative effects to things stored there. Too much heat can be bad for the things kept in the storage. It will gradually diminish their quality and can even damage those fragile and sensitive possessions. Moreover, the overly high temperature in the attic can result in the breaking of the house’s roof. Although these do not happen overnight, the effects will be noticeable in due time. The costs of replacements and repairs will only add to the family’s expenses. This is one of the reasons why mounting attic ventilation fans are necessary.

These attic fans also help minimize the development of excess moisture in the room. Lesser room moisture means it becomes impossible for molds and yeast to grow in the sheaths and frames under the roof especially on summer months. This is applies to both warm and cool seasons. For colder times, the cooling effects of attic ventilation fans are very helpful in preventing ice blocks from expanding on the rooftop. This protects the roof from being damaged by the ice.

There are many types of attic fans being sold in the market nowadays. However, using the solar types is highly recommended because of their economical value. These solar fans not only save on the electric bills but also reduce the amount of energy emitted by electronic appliances which are harmful to the environment. They are also as competent as the plug-in types of fans. While this choice of attic ventilation fans are more expensive compared to non-solar ones during the initial purchase, one cannot deny its long-term cost-efficiency.

People tend to neglect the importance of having a well-ventilated attic. Although it is just an extra space mostly utilized for storage, it significantly has effects on the amount of heat stored in the residence that has some lasting drawbacks to the house and the things kept in the attic. Therefore, it is important to take time to evaluate the attic’s ventilation needs and install efficient attic fans.

Additional information can be found at the Industrial High Pressure Blower Company web site http://www.highpressureblower.net/canadianblowerhoodedfans.html

Alex Todorovo
Industrial Mechanical Process Engineer
High Pressure Blower Co.
alex.todorov@canadablower.com
http://www.highpressureblower.net/rfq.html
http://www.highpressureblower.net/canadianblowerupblastfans.html

Attic Fans

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alex.todorov@canadablower.com

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Industrial Air Curtains

The idea of having an invisible barrier across the doorway to enable unimpeded access yet effectively prevent temperature flow, dust, odours and insects to cross, is appealing in itself but add to this the cost-saving in reducing energy use and the idea becomes more compelling, especially as air curtains are relatively inexpensive items.

Appropriate for industrial applications

Keeping warm air out of insulated cold stores or refrigerated facilities is the Number 1 objective yet a mockery is made of this premise when freezer of chiller doors are left wide open and, in some cases, chocked open to facilitate the movement or storage of perishables.

Self-generated pressure evolves from a non-circulatory type of air curtain as the jet induces ambient air into the stream. When the air curtain is installed on the outside of a cold room, the air spills back into the room and continues to do so until the pressure builds up to such a point that the air stream deflects to the outside.

Pressure Form Stack

The pressure-form-stack effect evolves when the cold air in the room is denser than the warmer outside air. The higher the ceiling, the higher the pressure becomes inside the cold room. The velocity of the air curtain should therefore be high enough to compensate for the outward pressure at the lower part of the cold room.

Wind pressures occur because of the conversion of the velocity pressure in the wind into static pressure. Of particular significance is the stability of the air curtain, which is directed by its outlet momentum. The curtain of air must be able to withstand pressure variations between the inside and the outside of the cold room. The outlet momentum should be sufficiently sustained and strong enough to stabilise the air at the floor. It is therefore essential to incorporate controls in the design of the air curtain to increase the strength of the velocity and ensure a stiff curtain of air and to decrease the velocity to prevent unnecessary heat and moisture transfer at the door.

Refrigeration Applications

In refrigeration applications, a high volume of turbulent air hitting the floor tens to form ice on the floor of freezers – this is not desirable or necessary so air flow needs to be adjusted so that it barely hits the floor. This can be accomplished by adjusting air louvers or fan speed to obtain the desired velocity. Drafts are eliminated by ensuring that air flow is vertical. The air curtain may be mounted on either the warm or cold side of the cooler with equal effectiveness.

The volume of air flow varies according to temperature difference between internal and external air and air exchange is therefore caused by thermal temperature differences. Using known values for the indoor and outdoor temperature difference, the densities, pressure differences and ultimately the air flow through the opening can be calculated.

Properly installed air curtains cut cold air loss and reduce humidity, thus reducing the load on refrigeration or air-conditioning plant and thereby saving energy by reducing compressor running time, maintenance, gas and recharging intervals. These units are an alternative to fast-acting roller doors and PVC slat curtains, and can be situated above or to the side of industrial doorways to create a powerful seal across the opening, keeping cold air in while providing complete visibility and access. This means that forklift drivers don’t have to get out of their cabs to open and close doors so that moving from one area to another is a lot easier and productive. Unlike plastic slat curtains, which quickly become opaque with use, an air curtain provides 100% visibility at all times. Units have been installed in loading bays, factories, hangars and production facilities, such as food processing and pharmaceuticals, where differential temperatures are encountered overseas.

Canadian Air Systems Co. is a well known designer and manufacturer of industrial and commercial air curatain systems and environmental air barriers.

For special applications Canadian Air Systems offer tangential air curtains to achieve high volume alminar air flow – to create permanent environmental air barriers.

For additional information please refer to http://nis-co.com/Index.html.

Oleg Tchetchel
Ventilation Engineer
Canadian Air Systems
http://www.nis-co.com
http://nis-co.com/aircurtain/Index.html

Air Curtains for Large Buildings Doors

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nis-co@nis-co.com

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nisco@primus.ca

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HVAC with Industrial Blowers and Fans

Heating, Ventilation and Air Conditioning (HVAC) is a system that provides warm air or cool air depending on your climate needs. HVAC systems are esteemed for their energy-saving abilities. They are installed by certified HVAC trained technicians only. Because of its awesome benefits, along with its pollution control feature, more homes are being installed with HVAC Indianapolis systems each year.

Another benefit of having an HVAC system installed at your home is its ability to clean and improve the air’s quality. Studies show that the quality of indoor air is way worse than outdoor air because indoor air is congested. The polluted indoor air, in turn, worsens allergies and causes colds to stay longer. With an HVAC system, the air indoors will constantly be exchanged with filtered fresh outdoor air.

It is true that the initial cost of an HVAC system is quite high. In fact, it is higher than the typical gas furnace. However, in the long run, each month you will feel the difference through your energy costs. Also, with HVAC systems, you won’t have to buy separate systems for heating and cooling and since there is only one machine, home space will also be saved for other important things. In addition, some HVAC systems run on renewable energy via solar panels. Plus, a non-chlorine-based coolant is used. You are actually saving the Earth too!

One major problem of most homeowners is moisture retention. Whether your local climate changes every few months or stays constant, moisture stays in your home. Indoors, air does not circulate properly without decent ventilation. Because of this, outside air cannot be able to circulate with the indoor air. When this happens, molds are more likely to grow inside walls, under floors, and even on your clothes. To avoid this, you need to dehumidify your home. An HVAC Indianapolis homes use can help you circulate indoor and outdoor air for less moisture in your home.

Moreover, HVAC systems increase a property’s value. In the case that you decide to sell your home in the future, your HVAC system will aid in appraising your home’s value. Compared to having an old-fashioned gas furnace which can be a potential fire hazard, an HVAC system is more convenient, appealing, and, not to mention, safe. Surely, most potential buyers will choose HVAC systems over old gas furnaces.

Consult your local heating and cooling Indianapolis based company about the things you need to prepare and are concerned about when planning to buy an HVAC system.

For additional information please refer to http://www.industrialblowerfan.com/index.html

Susanna Terlitskaia
Industrial Ventilating Engineer
Industrial Blower Fans Company
nis@primus.ca
http://www.industrialblowerfan.com/scrubbers-dust-collectors.html
http://www.industrialblowerfan.com/roof-extractors.html

HVAC System

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Industrial Ceiling Fans

Industrial Ceiling Fans and Their Significance in FanShare on emailEmail Share Favorite RePublish article .Industrial ceiling fans are 1 of the most crucial apparatus which you should have should you operate a major company that have to have high-end electric fans, then this is an ideal fan for you personally. Whether it truly is summer time or winter, it delivers even cool air. Even during an particularly humid day, the fan is consistently efficient. This is due to the smooth, heavy-duty motor and the 3 to 5 blades which are commonly 60 inches in length. Here are some brands and a brief description of each.

Emerson Industrial Ceiling Fans

These fans come in classy black colors that have typically three blades with 56 inches length. They’re long lasting because of their rust-resistant properties. It has also an extended rod, which allows a lot more angling and far more space to maneuver the fan.

Westinghouse Industrial Ceiling Fans

They typically come in pristine white color. They have three blades, a 56-inch blade, and also a 12-inch down rod. It also has a heavy-duty motor that gives you effective airflow that could take the location of air-conditioners. You could use it 24 hours and still invest less on power.

Air king Industrial Ceiling Fans

1 of the distinct features of these fans is their high-speed blades which might be 56 inches extended. This guarantees sufficient and continuous supply of fresh air. The silver finish of the blades gives style and class towards the otherwise drab exterior.

General Characteristics

All of these industrial ceiling fans are heavy-duty have durable motors which last long. They also are perfect for industrial plants or factories for the reason that they’re chemical-resistant and rust resistant and could cover and offer cool, air to a wider, spacious room

They’ve blades that could be applied in damp locations and you could successfully use them in location of air-conditioners. Because of the speed of the fans, they readily circulate air even in huge rooms with high ceilings. It can be also energy saving for the reason that the blades create adequate air in 1 rotation. These industrial ceiling fans can present all of the air you’ll need.

The 56-inch extended length of the blades they drastically improve the quantity of air circulated and as a result reduces the amount of humidity inside the room. Industrial businesses want this variety of ceiling fans to raise workers’ productivity because of great working conditions.

For those who personal an industrial business, then these ceiling fans can serve you very best because of their affordability, reliability, and efficiency. Buy your industrial ceiling fans now and be 1 contented entrepreneur.

If you are looking for more information regarding industrial ceiling fans, just visit northernindustrialsupplycompany.com now for all the tips, guides, and reviews of the best ceiling fans such as the energy star ceiling fans.

Additional information can be found at the Industrial Fan Blower company web site http://industrialfanblower.net/Index.htm

Oleg Tchechel
Developer of Industrial Air Make-Up Units
Industrial Fan Blower Co.
asap@buffalofan.com
http://www.industrialfanblower.net/cbd_feedback.htm
http://www.industrialfanblower.net/cbd_services.htm

Industrial Ceiling Fans

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asap@buffalofan.com

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Industrial Floor Fans

There are many industrial floor fans available on the market today. It may be difficult for you to chose from the various styles and colors available. The most common ones are black, metal or white. Some can go close to the floor and some are on stands. You need to be sure that you pick the type which fulfills your needs.

One thing to consider is the size of the area you want to cool. If it is a larger area then you may need to purchase a stand to put it on. If you have a smaller room then a small floor industrial fan is more appropriate. You must also consider safety and place the fan in a location where mishaps are unlikely to occur.

Industrial Fans Manufacturers

There are also many manufactures who produce industrial floor fans. This should also be selected with caution. Be sure you pick a manufacturer who is well known and has good feedback. If purchasing a fan made by an unknown or not so popular manufacturer, do some research to find out the type of support they provide. Make sure you check to see what is covered by warranties.

Choosing an Industrial Floor Fan

When picking out your industrial floor fan, make sure you see what can of noise is generated. This aspect will not make a difference if the fan is located in a garage or another area that is not used often. If the fan makes a lot of noise in a heavily used area, it can become an issue, especially in the workplace. It can take away concentration from work. Of course, the larger ones will be noisier only because of the size. Some make a lot of noise because of how they are designed. Others are designed to be quiet and do the job efficiently. Don’t only go by looks. Make sure you look at all of the product specifications.

Select a model that generates as little noise as possible. It won’t be possible to get one which is silent, but get one which won’t affect daily activities for your business.

Why are these industrial floor fans used?

One main reason for getting an industrial floor fan is energy efficiency. Typical air conditioning for a large area will run up bills. A fan is more economical and provides cooling. Another reason is to dry interior decoration such as carpets as well as floors. Dampness and flooding can be eliminated through the use of an industrial fan. This recovery method for water damange is very economical.

Industrial floor fans are useful because of the more economical approach for cooling and don’t require fuel to operate. They are helpful all year round and not just in higher temperatures. Fans help to allow air to circulate evenly since heat rises. You can find an industrial floor fan either online or offline. If you are researching for a new fan, then looking online will be your best bet.

Additional information can be found at the Industrial Fan Blower company web site http://industrialfanblower.net/Index.htm

Oleg Tchechel
Developer of Industrial Air Make-Up Units
Industrial Fan Blower Co.
asap@buffalofan.com
http://www.industrialfanblower.net/cbd_contact.htm
http://www.industrialfanblower.net

Industrial Floor Fans

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asap@buffalofan.com

industrialfanbl

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Industrial Exhaust Fans

NIS-CO offer smoke and heat exhaust fans that are UL listed for Smoke Control Systems and a full line of kitchen fans that are UL 762 listed for the exhaust of grease-laden air. Buffalo Blower engineers design, test, and manufacture fans for all types of buildings, including condos, custom homes, offices, malls, airports, arenas, and stadiums. We are able to meet your most precise requirements for a variety of HVAC equipment, including all types of custom, package air handlers and roof top units. In addition, NIS-CO can provide exhaust for restrooms, elevator shafts, parking garages, and jet bridges; stairwell pressurization; rooftop and sidewall supply and exhaust, including smoke and heat exhaust fans that are UL listed for Smoke Control Systems, as well as kitchen fans that are UL 762 listed for the exhaust of grease-laden air.

Large Industrial Fans

NIS-CO supplies thousands of fans to universities, hospitals, laboratories and research facilities, military bases, hotels, convention centers, and cruise ships around the world; working closely with architects, engineers and contractors to design and test fans that can meet the most precise quality and reliability requirements. NIS-CO amkes smoke and heat exhaust fans that are UL listed for Smoke Control Systems, kitchen fans that are UL 762 listed for the exhaust of grease-laden air, and a full line of laboratory and fume exhaust systems. NIS-CO provides fans for numerous residential building applications, such as stairwell and elevator shaft pressurization; kitchen, restroom, and pool exhaust; and every aspect of HVAC, including air handlers, gravity ventilators, and large rooftop units.

Exhaust Fans & Supply Fans

Manufacturing facilities require a large amount of ventilation to maintain a healthy work environment for the people working within the buildings. NIS-CO designs and builds fans to control and handle the exhaust, supply, and make-up air requirements for all types of manufacturing environments and spaces. The exhaust of welding and other noxious fumes and dusts, as well as the exhaust of hot air produced from ovens and other high temperature processes, are essential to providing safe and comfortable working conditions. In many cases, the building heating, cooling, and air conditioning (HVAC) requirements are also critical for proper production control and working conditions. A wide variety of businesses, industries, medical facilities, and institutions require ultra clean environments for research and development as well as production of specialty products and equipment. These facilities demand high filtration and positive pressures inside the clean room space to control the process and limit potential contamination. Other requirements typically include variable air volume, high efficient air moving equipment, low noise, and ultra-low vibration levels from the mechanical equipment.

Buffalo Fans & Ventilators

Among many other changes, the green revolution has created a greater need for more energy efficient fans and ventilation equipment. As a leader in the fan industry, NIS-CO engineers and manufactures high efficient products for a wide variety of green friendly applications including LEED building designs, biofuel and biomass production plants, landfills, solar film manufacturing facilities, as well as numerous waste energy and heat recovery systems. Regardless of how unique or specialized your process is, Buffalo Blower can customize our products to meet virtually any requirement.

Large Industrial Blowers & Fans

NIS-CO is well known for leveraging its design and manufacturing capabilities when constructing the heavy duty fans required for marine applications. Such marine duty fans are used for many purposes including boiler combustion air, mechanical ventilation, off shore rig diesel generator exhaust disbursement, pressurization, engine cooling, and dust control. Our air moving equipment can be found on drilling rigs, production platforms, tug boats, cruise ships, ferries, and cargo ships. We offer a number of features to meet the specific needs of the marine industry. These include shortened axial fan housings for operating in tight spaces, cast aluminum impellers and hot dip galvanized steel components for extended durability, spark resistant construction for potentially explosive air streams, water tight electrical connections to withstand corrosive environments, and IEEE 45 marine duty motors for both above deck and below deck installations.

Industrial Blower Supplier

In addition to our extensive fan design and manufacturing experience, NIS-CO offer a number of products meeting requirements of the marine industry’s governing and standard organizations including:

• Air Movement and Control Association (AMCA) – Spark Resistant Construction
• American Bureau of Shipping (ABS) – Type Approval for Ventilation and Non-Sparking services
• Appareils destinés à être utilisés en ATmosphères Explosives (ATEX) – Equipment Directive 94/9/EC

Additional information can be found at the NIS-CO company web site http://www.canadablower.com/fans/index.html

Susan Terlitski
Canadian Ventilating Engineer
canadablower@canadablower.com
NIS-CO
http://www.canadablower.com/blowers/index.html
http://www.canadablower.com/inquiry/index.html

Commercial Ventilators Fans

canadablower@canadablower.com

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buffaloblowercom

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Positive Pressure Ventilation with Industrial Blower Fans

Positive pressure ventilation ensures blowing things like debris and particles that would be harmful if humans breathed into their lungs out of the area where the humans are. Positive pressure ventilation also refers to medical procedures and devices that actually breathe for people who have experienced trauma and need to be on a ventilator system. For the purpose of this article we will be speaking of positive pressure ventilation in the capacity to remove unwanted contaminants from the air in a structure so that the remaining air is left breathable by all concerned.

Large Industrial Fans

Large fans are used in this ventilation type to push the particles from one area of a structure into another area of the same structure. This is successful because air that is in a high pressure area will automatically attempt to travel to a low pressure area. The fans can cause fire and debris to move from the high pressure area to an established exhaust point where it can be safely removed from the environment.

These systems are not frequently spoken of in most social circles. This is more than likely why you are unfamiliar with the term positive pressure ventilation. Large industrial companies have to use these methods of cleansing and purifying the air so that their employees can safely work in their factories.

Exhaust Fan Systems

Many things that are created cause harmful fumes, gases, and particles to enter the air where they are being manufactured. Exhaust systems and fans are used to push the harmful particles from the room and into areas where it can be contained or where it will cause no danger to any living thing.

Schools and residential homes do not require this type of ventilation, it is primarily used in factories, and manufacturing companies that create chemicals, use chemicals, or create something that causes toxic fumes to occur.

There are some places that only need this type of ventilation system in a small portion of their structure. Some of them only need these systems in one room of their buildings. It is possible to buy the correct components to clean the air in these areas without installing the same type of system throughout the structure.

Most of the modern systems that do this have units mounted in the loft space above the rooms. Some of them have units installed in specifically designed cupboards that house them. Series of ducts connect the units and the individual areas within the structure.

You can have decentralized mechanical extract systems incorporated into your building system design so that certain rooms have a continuous extraction rate that can ultimately be increased or decreased from one remote control panel.

This allows contaminated air from wet rooms and areas like these to be removed and replaced with filtered air that has been tempered and rendered perfect. Each building has unique specifications and must have their systems custom designed and installed in order for the air in all areas to be rendered clean and breathable.

For more information about proper building ventilation please visit the ABB Blower company web site http://fanblower.com/dust_collector_unit.htm

Susann Terlitski
Designer of Industrial Air Handling Units
Fan and Blower Co.
abbblower@abbblower.com
http://www.fanblower.com/dust_collector_unit.htm
http://www.fanblower.com/air_curtain.htm

Positive Pressure Ventilation

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Industrial Propeller Fans and Industrial Blowers

Electrical generators require the most reliable equipment for their air-cooling and ventilation needs. The fans used in these systems are mounted onto gas-turbine generator packages for use in power plants as well as on cruise ships, oil rig platforms, and mobile generators. These systems are loaded onto tractor-trailer rigs or barges and moved to a site to generate power for events like the Super Bowl and concerts. Manufacturers of these gas-turbine generators are realizing it pays to have the right fan for the job from the start and are turning to Buffalo Fan to provide these unique solutions.

Resilient Industrial Blowers

A key requirement for these applications is that the fans need to be exceptionally corrosion resistant to withstand these severe environmental factors.

Noise attenuation is a major issue for power generators, both to protect workers’ hearing and to keep operation at the quietest level for any surrounding residential or business communities.

High Performance Fans & Blowers

Power generation is a complex process. The power generation fan / blower equipment should be tough enough to avoid operational failure and to minimize installation and repair work. The rugged, high performance fans Buffalo Fan provided to a state-of-the-art hybrid energy center, were ideal for the task. Aerovent was chosen for this project because of their reputation for building large custom fans for extreme industrial applications. The energy center’s primary requirement was that its chosen vendor be able to design and build a set of the most rugged, efficient roof ventilators within budget. Most roof ventilator fans last between 10 and 20 years when properly maintained. Because of the permits and cost involved in performing maintenance work on the roof of a power plant, they wanted their fans to have a longer life span (up to 40 years). This lifespan requirement meant that the fans had to be constructed using industrial grade materials and components.

Propeller Fans

Northern Fan propellers provide equal airflow in both directions. Other companies’ fans have a standard-exhaust one-direction propeller and are run backwards for the supply mode, producing about 40 percent of exhaust-mode airflow. ABuffalo Fan blowers produce 100 percent airflow in either direction. Aerovent also produced an integrated electrical control system guaranteed to work with its fans instead of the power plant having to acquire a separate system from another source. The system features an onboard starterdisconnect switch, which boosts the motor’s start and can be easily disconnected.

Industrial Blower Safety

Fire safety is a challenge in any environment, and especially so in a power plant. In case of a fire, the first priority is to ensure the safety of employees. Another goal is to be able to salvage expensive equipment in the building. With ventilation fans, if the motor fails during a fire, it is more beneficial if the fan’s dampers automatically fail in the “open” position, and allow smoke to escape.

Custom Industrial Fan Design

Northern Fan’s expertise in custom-building fans for complex applications, like this energy center, allowed them to design and construct a special fire damper for the fans. When the motorized damper is activated, a metal linkage arm attached to the damper blades moves to open or close the damper.

Northern Fan Co. custom made damper features a fusible linkage arm with a “soft metal” section in the link. When temperatures reach 212 degrees (as in the case of a fire), the soft metal plate fails, breaking the linkage, and a heavy counter weight swings the damper into the “open” position.

Additional information can be found at the Northern Fan company web site http://northernindustrialsupplycompany.com/company.html

Oleg Tchetchel
Industrial Air Handling Systems Engineer
Northern Fan Co.
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Industrial Blower Fan Ventilation System

This article will discuss options for improving energy efficiency when designing an HVAC system and selecting a fan. HVAC design engineers face many choices throughout the planning process, perhaps few as crucial as that of fan equipment, a principal consumer of energy.

Industrial Blowers & Fans Flow Rates

Flow rates are predetermined based on space type and occupancy. Although local codes determine minimum requirements for HVAC systems, ASHRAE Handbook – HVAC Applications provides general design criteria for various commercial and public buildings. These criteria include air movement, room circulation, noise, and filter efficiency. Although all are important, room circulation, in air changes per hour, typically determines airflow requirements. Because flow rate is driven by design criteria, a design engineer’s primary means of reducing energy use is to minimize the static pressure needed to move air through a system.

Air Movement and Control Association (AMCA) International defines system pressure loss as “the sum of the static-pressure losses due to friction, shock, dissipation of velocity pressure at the system discharge, and the static-pressure differences between the entry and discharge openings of an air system. The static pressure a fan must overcome is dependent on many variables, only some of which the design engineer can control. The location of equipment often is determined by the architect and, therefore, limits the engineer’s options.

Blowers and Fans Duct Configuration

Duct configuration and fittings used to connect components are large contributors to static pressure. Other sources of system pressure loss are balancing and control dampers, variable-air-volume (VAV) boxes, diffusers, louvers, coils, filters, and other components in an air stream. Given that velocity pressure is proportional to the square of velocity, pressure loss in most of these components is proportional to velocity squared. This makes size an important factor, as cross-sectional area dictates fluid velocity. For example, reducing air velocity throughout a system by 10 percent would result in a 20-percent reduction in system static pressure. With air power proportional to pressure, this would equate to a 20-percent reduction in energy consumption.

In addition to accounting for all static-pressure loss in a system and achieving required room airflow, a design engineer must adhere to Section 6.5.3 of ANSI/ASHRAE/IESNA Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, which limits the power (horsepower) a fan can consume per cubic foot per minute of airflow the fan generates. With flow requirements defined, a design engineer must limit system static pressure to meet this power limitation.

System Effect and Industrial Fans and Blowers

A major contributor to energy consumption that often is ignored is system effect. AMCA International defines system effect as “a decrease in fan performance capability, observed as a pressure loss, which results from the effect of fan-inlet restrictions/obstructions, fan-outlet restrictions, or other conditions influencing the performance of the fan when it is installed in a system.”2 System effect is a reduction in a fan’s ability to generate pressure and can be looked at as an additional system pressure loss. It can lead to underperformance, excessive noise, and vibration in a fan and system.

System Effect and Fan Curves

System effect can be described by its impact on a fan curve. Fan curves are produced from laboratory testing, with fans configured for ideal installations. Testing is performed in accordance with ANSI/AMCA Standard 210-07/ANSI/ASHRAE Standard 51-2007, Laboratory Methods of Testing Fans for Certified Aerodynamic Performance Rating. A fan curve displays performance for a constant speed (revolutions per minute) in terms of static pressure vs. volumetric flow rate. In Figure 1, the intersection of the system-resistance curve and the pressure curve is the operating point of the fan. To move along the system curve to alter fan performance, one must increase or decrease fan speed accordingly. Operating power is where the power curve intersects with a vertical line running through the operating point.

Ideal Industrial Blower Fan Inlet & Outlet Conditions

The ideal inlet and outlet conditions under which fans are tested rarely are seen in the field. As a result, a fan will overperform or underperform in terms of flow rate, static pressure, or both. In Figure 2, a suitable fan was selected, but system effect was ignored. The blue lines represent how the fan would perform under AMCA International test conditions. Actual measured performance is indicated by the red dot. The red line shows how the fan would perform in an AMCA International air test when operating at design speed, but takes into account system effect. The only way to achieve the desired performance is to speed the fan to the rate designated by the green line. The consequence is a higher operating speed, higher brake horsepower, and higher sound levels.

Propeller Fan & Tube Axial Fan Selection

Another key to reducing power consumption is fan selection. Generally, propeller or tube-axial fans are more efficient for relatively low static pressures, while centrifugal-type fans are used for relatively high static pressures. Too often, fan selection is based solely on first cost. The consequence is that a relatively small-diameter, high-speed fan is used. A small fan operating at a high speed generally requires more operating power and produces more noise than a large fan operating at a low speed.

Most of the energy lost in a system is converted to heat. For example, mechanical and electrical energy losses in a fan motor raise the surface temperature of the motor. If the motor is in an air stream, the heat will be transferred directly to the air.

Belt Dive Propeller Fans and other Blower Fan Systems

In a belt-driven system, losses are the result of belt friction, slippage, and / or flexing. All such losses are converted to heat and, if the belt drive is in an air stream, increase the temperature of air. Fan losses quantified by fan efficiency contribute to air-temperature rise as well. As a fan works on a fluid, the friction attributed to the airflow decreases the fan’s efficiency and creates heat. As the efficiency of a system decreases, air-temperature rise increases. In a cooling application, this means increased energy consumption on the part of the compressor. Minimizing inefficiencies results in energy savings. It is the engineer’s responsibility to minimize total system pressure through proper design and layout. This involves balancing economics and efficiencies in specifying a fan. But not all responsibility resides with the engineer. The contractor must ensure appropriate equipment is installed and not base decisions solely on the lowest bid. The contractor needs to be aware of the consequences of poor installation and minimize system effects.

The losses accrued in a system directly affect the system’s power consumption while indirectly increasing the energy consumed by other processes. Energy losses in the form of heat equate to higher operating costs.

Because performance conditions are mandated by codes, proper system design, equipment selection, and installation are the most effective means of minimizing inefficiencies and saving energy.

Additional information can be found at the Northern Industrial company web site http://www.northernindustrialsupplycompany.com/products/air_handling_units.html

Oleg Cthetchel
Canadian Ventilation HVAC Engineer
Northern Industrial Co.
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Ventilation Systems Engineering

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