Infrared radiation is emitted into the environment. The air is heated by internal (thermal) energy. The kinetic energy of the air-blowing fan The more of the provided electrical energy that the appliance converts to useable energy reserves, the more efficient the equipment. Fans are used in heating, ventilation, and air conditioning systems (HVAC). They move heat or air away from where it is generated or collected and out of building structures. Heating, ventilation, and air-conditioning systems use fans to distribute heat or air throughout a building.
The three main types of fans are axial-flow, centrifugal, and oscillatory. An axial-flow fan has its blades arranged in a single row, with their axes of rotation parallel to each other. As such fans generate flow along their entire length, they are well suited to moving large volumes of air at high speeds. Their design elements include an impeller with multiple arms or fins which direct the flow of air against the interior surface of the housing. This causes the impeller to spin, generating torque that must be supplied by some form of motor. Axial-flow fans are commonly found in heating, ventilation, and air-conditioning systems as well as in outdoor units of heat pumps.
A centrifugal fan's blades are attached to a central hub and spun at high speed by an electric motor.
The heated filament emits visible light radiation. The more of the provided electrical energy that the appliance converts to useable energy reserves, the more efficient the equipment. Most electricity used by domestic appliances is lost as heat rather than converted into work.
Electricity is the flow of electrons through a conductor such as a copper wire. Electric circuits inside equipment use these flows to operate components such as motors, heaters, and lights. Electricity is also needed to transmit signals between devices over long distances or inside electronic circuits. It does not cause problems as long as it is used properly; however, if not used then electricity will be wasted.
Electrical power is the flow of electrons through a conductor such as a copper wire. Electrical circuits inside equipment use these flows to operate components such as motors, heaters, and lights.
Wasted electricity occurs when an electric device uses energy but produces no useful output. For example, this happens when you leave a television on after it has stopped broadcasting. Or a radio left on in a closet is also wasted energy.
|Hairdryer||Internal (thermal) energy heating the air. Kinetic energy of the fan that blows the air.|
|Battery operated torch||Light radiation given out by the hot filament of the bulb.|
|Battery operated analogue wall clock||The kinetic energy of the hands moving around.|
The energy is dispersed throughout the system. When two surfaces rub together in a mechanical system, energy is dissipated. The kinetic energy of the air-blowing fan is converted into potential energy by its movement against the wind resistance and into heat energy as it contacts various parts of the chassis and casing.
When an electric motor drives a fan, some of this energy is used to move the fan and disperse the energy outside the vehicle through radiation and convection. However, because electric motors are not perfect converters of energy, some energy is lost in producing the magnetic field that turns the rotor. This loss occurs because electrical power is not completely reversible; there is some conversion loss when electrons flow from one pole of a magnet to another. This loss is small enough to be negligible for ordinary electric fans, but it can be significant if you want a quiet computer room or a lean burn stovetop burner. Permanent magnets do not suffer from this problem, but they are more expensive than electromagnets.
Fans also lose energy due to friction. Friction is the force between any two surfaces interacting with each other. There are three main types of friction: sliding friction, rolling friction, and static friction. Sliding friction is present whenever two surfaces slide past each other.
(The fan transforms electric energy into kinetic energy, which is used to produce work, and it also converts some electric energy into heat.)
Electric fans use electricity to turn a motor, which in turn turns the blades of the fan. This movement creates air flow, which reduces the temperature of the surrounding objects (such as people) by moving away hot air and bringing in cooler air from outside the house or building.
Fans can be divided into three main categories based on how they operate: centrifugal, axial-flow, and oscillatory. Centrifugal fans use a spinning wheel or other rotating part to push air out through the casing. These fans are common in desk lamps, laptop computers, and tower speakers. An axial-flow fan uses one long blade that spins around an axis (like a propeller), producing a steady stream of air along the axis. These fans are found in computer cases and central cooling systems for high-performance computing devices. An oscillating fan has two or more curved blades that spin around a shaft, producing a back-and-forth motion that helps move air. These fans can be found in desktop computer case fans and outdoor air conditioner units.
Electric fans are very efficient tools for moving air.