Factors That Determine Ceiling Fan Airflow

There are several parameters or, if you prefer, characteristics that affect the efficiency of a ceiling fan. Among them, ceiling fan capacity is the most important factor. The rest of the characteristics are of indirect importance, but nevertheless, without them, it is impossible to form a picture of the efficiency of the fan chandelier.

• Ceiling fan capacity - is the volume of air mixed by the ceiling fan per hour. Measurement unit: [m³ / h].
• Ceiling Fan Speed - The speed at which the ceiling fan motor rotates [rpm]. Directly affects performance: the higher the rotation speed, the higher the performance.
  
• Ceiling Fan Blade Width - affects the performance of the ceiling fan. With equal diameters of dopas and the same speed of rotation of two ceiling units, the performance will be higher for the one with the wider blades. There are times when the fan performance is too high. In such cases, the fan speed is reduced.
  
• Blade Span Diameter or Blade Length - The longer the length of the ceiling fan blades, the larger the area of the room will be affected by the ceiling fan. Most ceiling fans come in 90mm, 120mm, 140mm, 160mm blades.
• The angle of inclination of the blade relative to the horizontal axis of this blade - affects the performance of the ceiling fan: the greater the tilt angle, the higher the performance. The greater the angle of inclination, the greater the loads the fan motor experiences. The maximum load on the engine occurs at maximum speed and at large angles of inclination of the blades. Chinese ceiling fans are manufactured with an inclination angle of 9-13 °, for medium ceiling fans the angle of inclination reaches 15 °, for expensive ones up to 20 °.
• The ratio of blade surface area to air flow - The larger the blade surface area, the more air the ceiling fan mixes. However, if the surface area of ​​the blade is too large, there will not be enough space between the blades for sufficient air intake. Some ceiling fans with unusually wide blades (for example, made in the form of palm leaves) or with more than six blades cannot mix the required amount of air. This is due to their low productivity. This relationship affects performance from negligible to significant (depending on measurement accuracy). Contrary to popular belief, the number of blades does not directly affect the performance of ceiling fans. Most 3-blade ceiling fans will mix more air than 4-blade ceiling fans, provided they run at the same speed.
• Height of the ceiling fan relative to the ceiling - If the ceiling fan blades are close enough to the ceiling, the ceiling fan will mix less air than originally calculated. Therefore, the desire to install a ceiling fan as close to the ceiling as possible, or even without a rod at all, leads to a significant decrease in performance. The distance the fan should be installed from the ceiling is directly related to its moving air potential. To achieve maximum performance, ceiling fan manufacturers recommend choosing a distance from the ceiling to the blades of at least 610mm. Unfortunately, at home, these distances are impossible (based on the height of the ceilings and safety precautions), but they are easily applicable to warehouse, industrial premises.

In addition to all of the above parameters, there are other parameters that affect the efficiency of a ceiling fan.

• Height of the ceiling fan relative to the observer - the closer the ceiling fan is to the observer, the more air flow that observer will feel.
• Tilt angle of ceiling fan blades with respect to the vertical axis - some manufacturers of ceiling fans design their blades in such a way that the tilt angle is negative, that is, the angle between the rod and the blade is less than 90 °. This design increases the area of ​​the room that the ceiling fan has a direct effect on and increases the fan efficiency perceived by people in the corners of the room, as well as reduces exposure to people directly under the ceiling.
• Indoor humidity - since the main task of a ceiling fan is to create a cooling effect, that is, evaporation of humidity (both sweat and humidity in the room), we can say that the efficiency of the ceiling fan is directly related to changes in humidity in the room. In rooms with low humidity, the ceiling fan is less efficient than in rooms with high humidity. This property is evident in cold, damp rooms.

Types of Ceiling Fans

Universal ceiling fans (Industrial ceiling fans)

Universal ceiling fans are designed to mix air in any season of the year in premises of various purposes - from residential to industrial, creating a cooling effect (in summer), or providing heat recovery (in winter).

Typically, these ceiling fans are equipped with specially profiled metal blades to ensure low noise levels with powerful airflow. The high quality epoxy resin coating of the fans makes them resistant to environmental influences.

The energy-saving effect of ceiling fans is based on the equalization of the air temperature along the height of the room. Heating large and high rooms requires a lot of energy, a significant part of which, due to air stratification in temperature, is lost in the upper part of the building without any benefit. The use of ceiling fans that stir the air allows you to minimize the temperature difference and provides significant savings in thermal energy (about 30-40%), and a comfortable air environment in the mezzanines and upper tiers of the shelves.

Household ceiling fans

These ceiling fans not only provide a light coolness, but are also a decorative element in the room. Compared to universal fans, residential ceiling fans are technically less efficient when it comes to heat recovery or cooling high and voluminous rooms. This decrease in technical performance is explained as follows: some aerodynamic subtleties were sacrificed to design. I must say that ceiling fans are practically the only tool, with the exception of floor or table fans, that can create a comfortable atmosphere on an open veranda or in a gazebo in hot summer weather. However, unlike floor and table fans, ceiling fans do not take up space on the floor or table, do not require outlets and storage space during off-season. Ceiling fans are safer compared to table and floor fans because they are located outside the area where people are located. All this makes it possible to eliminate a number of unpleasant situations when you can stumble over the wire going from the fan to the outlet, accidentally touch and drop the fan, or get your hand into the rotation zone of the blades. Household ceiling chandeliers-fans are recommended for use in homes and apartments, as well as in cafes, restaurants, hotels, conference rooms and shops, in other relatively small premises where people are constantly present.

Outdoor ceiling fans

Ceiling fans for outdoor use can be installed on verandas and open areas. The installation of these fans avoids the ingress of moisture and water, despite the fact that the degree of protection of these fans reaches IPX5. Outdoor ceilings are constructed with materials that can withstand cold, high temperature and humidity.

Energy Saving Ceiling Fans

These ceiling fans are produced according to the energy star standard. A special difference between such ceiling lamps is energy savings (up to 50%). This is a relatively new highly efficient product, which, thanks to the use of a DC motor and a special motor control controller, consumes significantly less energy and has better noise characteristics without reducing performance.

What are the Parts of a Ceiling Fan?

 A ceiling fan consists of the following key components:

 

Electric Motor: The electric motor is usually a low-speed single-phase asynchronous machine with several tens of poles.

Ceiling Fan Casing: A decorative casing that “encloses” the ceiling fan. Usually made of plastic or metal.

Fan Blades: Ceiling fans can have a different number of blades, the most common models have from three to six. However, some workshops make fans that emphasize the interior features of the premises more than mixing the air. The decrease in technical performance in such models is quite understandable: just some aerodynamic subtleties were sacrificed to the original design. Such ceiling fans can have any number of blades: one, and eight, and fifteen. In the manufacture and design of the blades, various methods of decorative finishing and many materials are used: metal, plastic, MDF, natural wood and others.

Fan Bracket: A bracket is designed to attach the blades of ceiling fan to the housing. Usually made of metal.

Devices for Mounting the Fan to the Ceiling: Quite often, during installation, a "ball-and-socket" system is used. In such a system, there is a plastic or metal hemisphere that is attached to the end of the rod. The hemisphere has a slot for a metal bracket. The hemisphere is firmly pressed against the bar, and the mounting plate is put on the hemisphere using a bracket. Several companies have come up with modifications to this system. Often a J-hook system is used for installation. In practice, two options are used:

The first option- J-hook is a stud with a thread at one end and the other bent by more than 90 °. This installation method is used if there is a possibility of fastening using a stud connection.

The second option- J-hook is a self-tapping screw, at one end of which there is a thread with a drill, and the other is bent by more than 90 °. This method is used if it is possible to screw the hook into the ceiling (with or without a dowel). 

Ceiling Fan Bar: Designed to change the distance from the ceiling to the fan blades. As a rule, a rod up to 0.5 m long is supplied with a ceiling fan. However, if necessary, you can mount a shortened (up to 0.25 m) or extended (up to 1.5 m) version of the rod. When choosing a rod, it should be borne in mind that the height from the floor to the blades of the ceiling fan must be at least 2.3 m.

Ceiling Fan Hoods: Many models have two caps: upper and lower.

Lower - located at the bottom of the rod (above the fan housing). Serves to hide wires, terminal box, parts such as capacitor, internal adjustment components, etc.

Upper - located near the ceiling on the top of the boom. Serves to hide the ceiling fan-to-ceiling fixing device and installation wires. Caps are usually made of plastic or metal.

Decorative elements for ceiling fans. Serve to hide the screws with which the blades are attached to the "irons". Made of plastic, metal or other material.

Switches, speed controllers, controllers, fan remotes: 

There are several types of fan regulation: Adjustment on the ceiling fan housing. Most models of ceiling fans are reversible, which allows you to choose the direction of the airflow generated by them - up or down. To implement this function, switches are provided on the fan casings. Also, these fans, as a rule, are equipped with switch cords, one of which allows you to turn on or off the lamp (if any), and the other - to select one of several possible speeds of rotation of the fan blades.

Speed ​​controllers 3, 5-speed (transformer) and smooth (thyristor), remote controls. Speed ​​controllers allow you to switch the speed of the ceiling fan stepwise or smoothly, turn on / off the chandelier fan, turn on the lamp off, select the direction of rotation of the blades.

Ceiling Fan Lamps: 

There are ceiling fans: Without luminaires and without the possibility of installing any luminaire on the fan housing.

Without a luminaire with the possibility of installing additional luminaires as accessories - from 1 to 5 (but sometimes up to 10-12 pieces).

Ceiling fans with a luminaire in a set from 1 to 5 (but sometimes up to 10-12 pieces), with the direction of the glow up and down. As a rule, the base of the fan chandeliers is E27 and E14. The possibility of using energy-saving lamps is provided.

History & Origin of Ceiling Fan

Ceiling fan is a fan that is mounted on the ceiling, used to mix air masses and create a cool effect.

 

History of Origin

The idea of a mechanical device capable of creating a natural flow of air has excited the minds since time immemorial. The first device to solve this problem was an ordinary fan, which was used in ancient China. Subsequent scientific research and technical improvements did not change the simple and ingenious idea of a fan too much, eventually reducing it to such a device as a ceiling fan.

The first technically sophisticated machines for moving air appeared in the Middle Ages in Europe. The prototype of the ceiling fan can to some extent be considered the helicopter of Leonardo da Vinci: this technical device, alas, could not fly, but the wind created a fair amount.

The first ceiling fans appeared in the United States after the Civil War in the late 1860s. At the time, they worked without an electric motor. Instead, the mechanical energy of water was used: the water wheel was tied to a belt system, which, in turn, was connected to a 2-blade fan. Such a system could provide operation of several ceiling fans at once. At that time, this invention was the only one in the field of "air cooling", thanks to which it became quite popular in shops, restaurants and offices. Some of these systems have survived to this day. They can be seen in the southern regions of the United States, where they originally appeared.

The electrically driven ceiling fan was invented in 1882 by Philip Diel. Diehl was involved in the design of the electric motor for the first Singer sewing machines, and in 1882 he adapted it for use in ceiling fans. The Diel Electric Fan worked like most modern ceiling fans, but each fan now had its own motor, eliminating the need for expensive and cumbersome belt systems.

Diel almost immediately faced serious problems due to tough competition in the market, as ceiling fans were in great demand among the population. The competition pushed him to make new improvements and refine his invention.

The result of these improvements was the "Diesel Chandelier", which was a set of lamps mounted on the ceiling fan housing. The luminaires compensated for the light flaws associated with blinking blades, the so-called "running shadow", and, in addition, provided additional lighting in the room.

By the start of World War I, most ceiling fans had four blades instead of the original two.

Over time, thanks to the advent of new bearings, the fans have become much quieter and, moreover, they have now been able to mix large volumes of air, thereby using the consumed energy more efficiently.

By 1920, ceiling fans became common in the United States and began to expand internationally. However, during the Great Depression in the United States, they began to go out of fashion. By the end of World War II, ceiling fans had disappeared from the American market altogether, and that was until the mid-1950s.

In the United States, ceiling fans have come to be seen as a tribute to the past, giving way to air conditioners. But at the same time, they were quite popular in other countries, especially where warm climate prevailed, and where residents could not afford to buy energy-consuming and expensive air conditioners.

In the 1960s, several Asian manufacturers began exporting their ceiling fans to the United States. At first, the exports were quite small. The market was spurred by the energy crisis in the late 1970s: ceiling fans began to conquer the market again, as they consumed much less energy than air conditioners.

Seeing the commercial success of Asian manufacturers, many American companies began to produce, and subsequently significantly increase the production of ceiling fans in the United States.

During the second half of the 1970s and until the late 1980s, ceiling fans remained popular in the American market. Many small American manufacturers, most of whom were fairly young companies, produced these products. Throughout the 1980s, the sales ratio between American and Asian ceiling fans changed dramatically. The high cost of US-made components and the high cost of labor contributed to a significant increase in prices, with the result that American products could no longer compete with Asian ceiling fans.

In addition, sales of ceiling fans declined from the early to mid-1990s as the cost of air conditioners continued to decline. With the decline in sales, research and development funding for ceiling fans has dropped. It was then that standard components such as solid wood blades fixed to the fan casing, high quality motors, and cast steel casings were replaced with cheap, standardized parts.

National Geography Tries Inspire Kids to Read and Write with Animal Jam Journal

The Animal Jam is popular online game for kids, but this time National Geography has published an Animal Jam Journal to inspire kids to read and write. In their Animal Jam book, they try to turn the story of online adventure into text.

In the Journal they have added lots of prompts to let kids involved with writing specially. Along with that, kids will also find the story of the adventures of Jamaa. Previously the world of Jamaa was featured on the Animal Jam online games.

Now, National Geography Kids swifts the digital world of Jamaal into real life. They also want that kids don’t only pass their time over online. According to them, kids should also spend their time reading and writing activates.

Unlike other online games, Animal Jam is offering a friendly online environment for kids. Parents can monitor and control your Animal Jam account.

As like they can change your password on Animal Jam, see login history, recover your account and many more.
In Animal Jam, players learn about forest, jungle animals and other educative things. It’s fun and enjoyable online multiplayer game with lots of things to learn.

However, now all of story and adventure has written in this Animal Jam Journal or book.

Generally, NAT Geo also is known for publishing popular educative books and documentaries. So, Animal Jam Journal is non-other than another great piece of books filled with lots of interesting stuff.

They have said it a cool and collectible book for die-hard Animal Jam Fan.

It has an imaginative and inspirational story with silly prompts that will trigger little explorer to write by themselves.

As it’s a National Geography publication, this book also contains surprising facts and joy of exploring the world and knowing the truth.

Although it made for Animal Jam lovers, this can be read by anyone. The Animal Jam Journal is available on the National Geography store to buy at $9.99.

It would really, an amazing book to read for all ages. It has lots of interesting story in its 112 pages.

The New Phase of Minecraft Aquatic Update is Here with New Biomes, Mobs and More

As Minecraft Aquatic Update is already a massive edition to play on, It also realized it's the second phase for Windows 10, PlayStation, Xbox, Nintendo, Mobile, and VR. It's needless to say how amazing the underwater world is, But the new update would be much more to play.

The Aquatic Update offers a new level of underwater environment to lets you play to create and discover. Here you can search for resources or create yourself. Along with that on this new update, you will get more than 3,000 undersea mobs to explore.

If we look at all those water mobs, there are so many things as like deep sea creatures. Here you will get cute fishes like dolphins or scary mobs like Drowned. Sounds mysterious? that what you should check out in the new world of blue.

There are also so many randomly generated structures that will blow your mind. It's so pleasing to discover those structures here and there on a deep sea. Also, here you can learn about the beautiful coral reefs which make the underwater more colorful.

Like any general Minecraft, here you can also find secret underwater caves and ravines. Those features so many Pistorius treasures with so many rare items. The joy of collecting items is also here on the Aquatic Update. 

Here you can also explore new weapons like trident which lets you hunt mobs. To explore more this update also includes interesting underwater places. However, It's would be better to allocate more RAM to Minecraft as it has so many things to render.

It's really clear that the new addition of Minecraft Aquatic Update will be blazing with all new underwater experience.

Just look at the new trailer and you will surely discover yourself in the underwater explorer of Minecraft Aquatic.

You shouldn't miss this huge collection of underwater mysteries along with Minecraft charms.