A fan heater , also called blow heater , is a heater that works by using a fan to drain air to a heat source (eg heating element). It heats the air, which then leaves the heater, warms the room around it. They can heat a closed space like a room faster than a fanless heater, but, like any fan, creates audible sounds.
Video Fan heater
Cost and efficiency
Electric fan heaters can be cheaper to buy than other heaters because of simple construction. The fan carries heat from the device, which can be made smaller without overheating. The relatively small amount of electricity used to operate the fan is partially converted into additional heat, so efficiency is not an issue. All heaters without external ventilation are almost 100% efficient, which means that almost all energy inputs enter the room as heat. However, if the efficiency of generating electricity is taken into account, the overall efficiency decreases significantly.
Electric fan heaters are more expensive to run than fuel-powered heaters because of the cost of electricity. This makes them most suitable occasionally used rather than as a regularly used heat source.
External burn heating (electric burning) fan loses a certain amount of heat to the outside, and thus is less efficient. This is used if there is no need to release the combustion smoke to a hot area.
Maps Fan heater
Control
Most modern fan heaters have power settings to determine the power output. Some also have thermostats that turn off heaters when the desired environmental temperature is reached. They do not maintain perfect room temperature control, ever since
- The thermostat usually sticks to the heating body, and senses the temperature there.
- Basic bimetallic thermostats that are usually used have significant hysteresis.
- Remote sensors and thermostats with little hysteresis are available but less common, as they are more expensive and basic fan heaters are satisfactory for most purposes.
Heat source
While the fan is in an electrically powered heater fan, various heat sources can be used:
- Electrical heating elements are common, and are used in portable plug-in power heating. Although they may supply several kilowatts of heat, such heaters are usually small because the electrical element itself is small. Because heat is released by the fan, the heating body does not need to be an effective heat sink. Hot water tubing is used in hot areas provided by hydronic heating systems.
- Gas, kerosene, and sometimes other fuels like used engine oil are burned in high-powered fan heaters.
Security
The electric fan heater is a device that is not sealed with live electrical parts inside it, so it is not safe to use in a wet environment because of the risk of electric shock if the water vapor provides a conductive path to the electrically alive part. The electric fan heater usually has a thermal fuse close to the heating element to protect from overheating in case of fan failure or blocked air ducts, and a tip-over switch to turn off the heater when the fan outlet is absent. orientation required. Heaters with metal coatings have better performance in the case of possible causes of fire than those made of plastic, since the casing will remain intact and non-flammable, but the metal casing presents a higher risk of electricity if heating malfunctions.
The portable fuel-powered heater fan releases all combustion smoke into the room, creating a risk of carbon monoxide poisoning and carbon dioxide. Most of the world's first installed fuel heaters use external heaters and vents, avoiding that risk by emptying the combustion gases out.
Internal section
Residential model
The image immediately to the right (the top of the mobile site) shows most of the components of typical plug-in power fan heaters.
- The heating element is a circular wire frame located behind the fan blade.
- The thermostat is at the top left.
- The heat selector switch (watt) is at the top right.
- The switch at the bottom is a normally open switch that serves as a "tipover switch" safety device: as long as the heater stands upright, the switch is switched on and the circuit is closed.
- The grips for the power cord are on the bottom right.
The next picture shows two pieces that are too hot. Bimetallic pieces (left) operate when the device is overheated due to blocked intake or fan failure, and resets once the heater cools after the obstruction is removed. The thermal fuse (right) is an insecure backup tool that will permanently break the heating element in case of overheating causing the risk of fire, usually because the bimetal switch fails to operate (eg because the contacts are fused).
Industrial model
Industrial fan heaters use high-output heating elements in front of the fan to provide greater airflow and higher kilowatt ratings than many smaller fan heaters. Industrial fan heaters can be used in warehouses, shipping containers, clean rooms, shops and other general purpose heating applications. They may also be used as desiccants or reducers with attachments or modified mounts. Portable industrial heating fans tend to range from about 1.5 kW to about 45 kW with axial or centrifugal fans and a variety of gradual controls and excess temperature control limits.
See also
- Convector heater
- Electric heating
- fan coil unit
- HVAC
- unit ventilator
Source of the article : Wikipedia
0 Comments