A mechanical fan is an electrically powered device used to produce an airflow for the purpose of creature comfort (particularly in the heat), ventilation, exhaust, or any other gaseous transport. Ventilation is the intentional movement of Air from outside a building to the inside
Mechanically, a fan can be any revolving vane or vanes used for producing currents of air. A current, in a River or Stream, is the Flow of Water influenced by Gravity as the water moves Downhill to reduce its Fans produce air flows with high volume and low pressure, as opposed to a gas compressor which produces high pressures at a comparatively low volume. A gas compressor is a mechanical device that increases the Pressure of a Gas by reducing its Volume. A fan blade will often rotate when exposed to an air stream, and devices that take advantage of this, such as anemometers and wind turbines often have designs similar to that of a fan. An anemometer is a device for measuring wind speed and is one instrument used in a Weather station. A wind turbine is a rotating machine which converts the Kinetic energy in Wind into Mechanical energy.
Typical applications include climate control, cooling systems, personal comfort (e. HVAC (pronounced either "H-V-A-C" or occasionally " H-vak " is an Initialism or Acronym that stands for " Heating g. , an electric table fan), ventilation (e. g. , an exhaust fan), winnowing (e. Wind winnowing is an agricultural method developed by ancient cultures for separating grain from Chaff. g. , separating chaff of cereal grains), removing dust (e. g. sucking as in a vacuum cleaner), drying (usually in addition to heat) and to provide draft for a fire. A vacuum cleaner (in colloquial British English also hoover) is a device that uses an air Pump to create a partial Vacuum to Suck Fire is the heat and light energy released during a Chemical reaction, in particular a combustion reaction. It is also common to use electric fans as air fresheners, by attaching fabric softener sheets to the protective housing. Air fresheners are Consumer products that mitigate unpleasant Odors in indoor spaces Fabric softener (also called Fabric Conditioner) is used to prevent Static cling and make fabric softer This causes the fragrance to be carried into the surrounding air.
In addition to their utilitarian function, vintage or antique fans, and in particular electric fans manufactured from the late 1800s through the 1950s, have become a recognized collectible category, and in the U. For the record label see Collectables Records For the Ashanti album see Collectables by Ashanti A collectable S. A. an active collector club, the Antique Fan Collectors Association, supports the hobby. [1].
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History
The first recorded mechanical fan was the punkah fan used in the Middle East in the early 1800s. The Middle East is a Subcontinent with no clear boundaries often used as a synonym to Near East, in opposition to Far East. It had a canvas covered frame that was suspended from the ceiling. Servants, known as punkah wallahs, pulled a rope connected to the frame to move the fan back and forth. A rope is a length of Fibers twisted or Braided together to improve strength for pulling and Connecting.
The Industrial Revolution in the late 1800s introduced belt-driven fans powered by factory waterwheels. The Industrial Revolution was a period in the late 18th and early 19th centuries when major changes in agriculture manufacturing and transportation had a profound effect on the A water wheel is a means of extracting power from the flow (or fall of water otherwise known as Hydropower. Attaching wooden or metal blades to shafts overhead that were used to drive the machinery, the first industrial fans were developed. One of the first workable mechanical fans was built by A. A. Sablukov in 1832. He called his invention, a kind of a centrifugal fan, an Air Pump. Centrifugal fans were successfully tested inside coal mines and factories in 1832-1834. When Thomas Edison and Nikola Tesla introduced electrical power in the late 1800s and early 1900s for the public, the personal electrical fan was introduced. There have already been discussions about Tesla's ethnicity on the talk page Between 1882 and 1886, Dr. Schuyler Skaats Wheeler developed the two-bladed desk fan, a type of personal electric fan. Schuyler Skaats Wheeler ( May 17 1860 – April 20 1923) was an American Engineer who invented the two-blade Electric It was commercially marketed by the American firm Crocker & Curtis electric motor company. In 1882, Philip H. Diehl introduced the electric ceiling fan. Diehl is considered the father of the modern electric fan. In the late 1800s, electric fans were used only in commercial establishments or in well-to-do households. Heat-convection fans fueled by alcohol, oil, or kerosene were common around the turn of the 20th century.
The first American made fans, made from around the late 1890s to the early 1920s were very stylish. They had brass blades, a lot of them also had brass cages, and though they were built very well internally, they were far from finger safe, as a lot of them had cage openings so big that one could put an entire hand or arm right through it. Brass is any Alloy of Copper and Zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties Many children had hands and fingers severely injured by those fans.
In the 1920s, industrial advances allowed steel to be mass-produced in different shapes, bringing fan prices down and allowing more homeowners to afford them. In the 1930s, the first art deco fan was designed. Before this fan, called the Silver Swan, most household fans were fairly plain. In the 1950s, fans were manufactured in colors that were bright and eye catching. Central air conditioning in the 1960s brought an end to the golden age of the electric fan. The term air conditioning refers to the cooling and dehumidification of indoor air for Thermal comfort. The 1960s decade refers to the years from the beginning of 1960 to the end of 1969 In the 1970s, Victorian-style ceiling fans became popular.
In the 20th century, fans have become utilitarian. During the 2000s, fan aesthetics have become a concern to fan buyers. The fan is part of everyday life in the Far East, Japan, and Spain (among other places). The Far East is a term often used by people in the Western world to refer to the countries of East Asia. Spain () or the Kingdom of Spain (Reino de España is a country located mostly in southwestern Europe on the Iberian Peninsula. Electric fans have been largely replaced by air conditioners in offices, but they are still a common household appliance.
Types of fans
Mechanical revolving blade fans are made in a wide range of designs. In a home you can find fans that can be put on the floor or a table, or hung from the ceiling, or are built into a window, wall, roof, chimney, etc. They can be found in electronic systems such as computers where they cool the circuits inside, and in appliances such as hair dryers and space heaters. A computer is a Machine that manipulates data according to a list of instructions. They are also used for cooling in air-conditioning systems, and in automotive engines, where they are driven by belts or by direct motor. Fans create a wind chill but do not lower temperatures directly. This page is for the movie "Wind Chill" For the term see Wind chill.
There are three main types of fans used for moving air, axial, centrifugal (also called radial) and cross flow (also called tangential).
Axial fans
The axial-flow fans have blades that force air to move parallel to the shaft about which the blades rotate. Axial fans blow air across the axis of the fan, linearly, hence their name. This type of fan is used in a wide variety of applications, ranging from small cooling fans for electronics to the giant fans used in wind tunnels. A wind tunnel is a research tool developed to assist with studying the effects of air moving over or around solid objects
Examples of axial fans are:
- Table fan - Basic elements of a typical table fan include the fan blade, base, armature and lead wires, motor, blade guard, motor housing, oscillator gearbox, and oscillator shaft. A wire is a single usually cylindrical, elongated string of drawn Metal. A safety barrier is a component which prevents access to a dangerous area Oscillation is the repetitive variation typically in Time, of some measure about a central value (often a point of Equilibrium) or between two or more different states The oscillator is a mechanism that motions the fan from side to side. The axle comes out on both ends of the motor, one end of the axle is attached to the blade and the other is attached to the oscillator gearbox. The motor case joins to the gearbox to contain the rotor and stator. The oscillator shaft combines to the weighted base and the gearbox. A motor housing covers the oscillator mechanism. The blade guard joins to the motor case for safety.
- Electro-mechanical fans, among collectors, are rated according to their condition, size, age, and number of blades. Four-blade designs are the most common. Five-blade or six-blade designs are rare. The materials from which the components are made, such as brass, are important factors in fan desirability.
- Ceiling fan - A fan suspended from the ceiling of a room is a ceiling fan. A ceiling fan is a device suspended from the ceiling of a room which employs hub-mounted rotating paddles to circulate air in order to produce a cooling or Destratification See Ceiling fan. A ceiling fan is a device suspended from the ceiling of a room which employs hub-mounted rotating paddles to circulate air in order to produce a cooling or Destratification
- In automobiles, a mechanical fan, driven with a belt and pulley off the engine's crankshaft, or an electric fan switched on/off by a thermo switch is used to blow or suck air through a coolant filled radiator, to prevent the engine from overheating. A pulley (also called a sheave or block) is a Wheel with a groove between two Flanges around its Circumference The internal combustion engine is an engine in which the Combustion of Fuel and an Oxidizer (typically air occurs in a confined space called a The crankshaft, sometimes casually abbreviated to crank, is the part of an Engine which translates reciprocating Linear A thermostat is a device for regulating the Temperature of a System so that the system's temperature is maintained near a desired setpoint A switch is a mechanical device used to connect and disconnect an electric Circuit at will Suction is the flow of a fluid into a partial Vacuum, or region of low pressure A coolant is a fluid which flows through a device in order to prevent its overheating transferring the heat produced by the device to other devices that utilize or dissipate it Radiators and convectors are types of Heat exchangers designed to transfer Thermal energy from one medium to another for the purpose of cooling
- Variable Pitch Fan A variable pitch fan is used where precise control of static pressure within supply ducts is required. A computer fan can be any fan inside a Computer case used for cooling purposes and may refer to fans that draw cooler air into the case from the outside expel warm The fan wheel will spin at a constant RPM (1780 in this case). The blades follow the control pitch hub. As the hub moves toward the rotor the blades increase their angle of attack and an increase in flow results.
Centrifugal fan
Often called a "squirrel cage" (due to its similarity in appearance to exercise wheels for pet rodents), the centrifugal fan has a moving component (called an impeller) that consists of a central shaft about which a set of blades, or ribs, are positioned. The related term squirrel cage may refer to * a Squirrel cage rotor * a squirrel cage fan or blower Centrifugal fans blow air at right angles to the intake of the fan, and spin the air outwards to the outlet (by deflection and centrifugal force). The impeller rotates, causing air to enter the fan near the shaft and move perpendicularly from the shaft to the opening in the scroll-shaped fan casing. In Geometry, two lines or planes (or a line and a plane are considered perpendicular (or orthogonal) to each other if they form congruent A centrifugal fan produces more pressure for a given air volume, and is used where this is desirable such as in leaf blowers, air mattress inflators, and various industrial purposes. A leaf blower is gardening tool that propels air out of a nozzle to move yard debris such as Leaves. They are typically noisier than comparable axial fans.
Cross flow fan
The cross flow fan has a squirrel cage rotor (a rotor with a hollow center and axial fan blades along the periphery). Tangential fans take in air along the periphery of the rotor, and expel it through the outlet in a similar fashion to the centrifugal fan. Cross flow fans give off an even airflow along the entire width of the fan, and are very quiet in operation. They are comparatively bulky, and the air pressure is low. Cross flow fans are often used in air conditioners, automobile ventilation systems, and for cooling in medium-sized equipment such as photocopiers. An air conditioner is an Appliance, System, or mechanism designed to extract Heat from an area via a Refrigeration cycle A photocopier (or copier is a machine that makes Paper copies of documents and other visual images quickly and cheaply The action of a fan or blower causes pressures slightly above atmospheric, which are called plenums.
Fan motor
A stand alone fan is typically powered with an electric motor. An electric motor uses Electrical energy to produce Mechanical energy. Fans are often attached directly to the motor's output, with no need for gears or belts. The electric motor is either hidden in the fan's center hub or extends behind it. For big industrial fans, 3-phase asynchronous motors are commonly used, placed near the fan and driving it through a belt and pulleys. A pulley (also called a sheave or block) is a Wheel with a groove between two Flanges around its Circumference Smaller fans are often powered by shaded pole AC motors, or brushed or brushless DC motors. A shaded-pole motor is a type of AC single-phase induction motor. A brushed DC motor is an internally commutated electric motor designed to be run from a DC power source The statement Brushless DC electric motor may be misleading and controversial among professionals because it's actually an 3 phase AC motor driven by a DC source AC-powered fans usually use mains voltage, while DC-powered fans use low voltage, typically 24 V, 12 V or 5 V. Cooling fans for computer equipment exclusively use brushless DC motors, which produce much less electromagnetic interference.
In machines which already have a motor, the fan is often connected to this rather than being powered independently. A computer fan can be any fan inside a Computer case used for cooling purposes and may refer to fans that draw cooler air into the case from the outside expel warm This is commonly seen in cars, boats, large cooling systems and winnowing machines, where the fan is connected either directly to the driveshaft or through a belt and pulleys. Another common configuration is a dual-shaft motor, where one end of the shaft drives a mechansim, while the other has a fan mounted on it to cool the motor itself.
Solar powered fan
Electric fans used for ventilation may be powered by solar panels instead of mains current. In the field of Photovoltaics, a photovoltaic module is a packaged interconnected assembly of photovoltaic cells also known as Solar cells An installation of This is an attractive option because once the capital costs of the solar panel have been covered, the resulting electricity is free. In addition, electricity is always available when the sun is shining and the fan needs to run.
A typical example uses a detached 10 watt, 12x12 inch (30x30 cm) solar panel and is supplied with appropriate brackets, cables, and connectors. The watt (symbol W) is the SI derived unit of power, equal to one Joule of energy per Second. Inches redirects here To see the Les Savy Fav album see Inches. The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International Brackets are Punctuation marks used in pairs to set apart or interject text within other text A cable is one or more Wires or Optical fibers bound together typically in a common protective jacket or sheath It can be used to ventilate up to 1250 square feet (100 m²) of area and can move air at up to 800 cubic feet per minute (400 L/s). The square foot is an Imperial unit / US customary unit (non- SI non- metric) of Area, used mainly in the United States Area is a Quantity expressing the two- Dimensional size of a defined part of a Surface, typically a region bounded by a closed Curve. The cubic foot is an imperial and US customary (non- metric) unit of Volume, used in the United States Canada and the United Kingdom Because of the wide availability of 12 V brushless DC electric motors and the convenience of wiring such a low voltage, such fans usually operate on 12 volts. The statement Brushless DC electric motor may be misleading and controversial among professionals because it's actually an 3 phase AC motor driven by a DC source The volt (symbol V) is the SI derived unit of electric Potential difference or Electromotive force.
The detached solar panel is typically installed in the spot which gets most of the sun light and then connected to the fan mounted as far as 20 to 25 feet (6 to 7 m) away. A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit Other permanently-mounted and small portable fans include an integrated (non-detachable) solar panel.
See also
References
The affinity laws are used in Hydraulics and HVAC to express the relationship between several variables involved in pump or fan performance (such as head Fan death is a South Korean Urban legend which states that an Electric fan, if left running overnight in a closed room can cause the death (by Suffocation A turbine is a rotary Engine that extracts Energy from a Fluid flow A whole-house fan is a type of fan installed in a building's ceiling designed to suck hot air out of the building A wind turbine is a rotating machine which converts the Kinetic energy in Wind into Mechanical energy. A window fan is a fan designed to be placed inside the frame of a Window.Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic