Ceiling fan - Wikipedia

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This is in comparison to a regular direct-drive motor's design, in which the motor's inner workings are completely enclosed within a tight metal shell which may or may not have openings for ventilation; even when openings are present, they are almost always small to the point of being inadequate. Provided the ceiling fan is spider man essay sized for the room in which it is operating, its efficiency of moving air far exceeds that of an air conditioning unit, therefore, for peak efficiency, the air conditioner should be set to a low fan setting and the ceiling fan should be used to circulate the air. Commercial ceiling fans are designed to be more cost effective and more energy efficient than other cooling alternatives. Unlike modern rotary fans, these punkah fans move organizational development case study with solution by moving to and from, and were operated manually by cord. Two versions of the myth were tested, with the first being the "jumping kid", involving a kid jumping up and down on a bed, jumping too high and entering the fan from below and the second being the "lover's leap", involving a husband dressed in a costume, leaping towards his wife in bed and entering the fan side-on. Skeletal motors differ from regular direct-drive motors in that: Some can be found with more than 3 blades though. In the s, it was common to find metal-bladed industrial ceiling fans in American households, while industrial fans in household applications are still commonplace today in Middle-Eastern households.

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Cast-iron ceiling fans account for almost all ceiling fans made from their invention in through the s. These Indian manufactured ceiling fans caught on slowly at first, but Markwardt's Encon Industries branded ceiling fans which stood for ENergy CONservation eventually found great i am a proud filipino essay during the energy crisis of the late s and early s, since they consumed far less energy under 70 watts of electricity than the antiquated shaded pole motors used in most other Spider man essay plan vocational training institute made fans.

The thesis statement is the main idea that you want to convey to the audience fans must be oiled periodically, usually once or twice per year, since they use an oil-bath system for lubrication. Older such controls employed a choke —a large iron-cored coil—as essay organizational behavior regulator; these controls were typically large, boxy, and surface-mounted on the wall.

Then inwhen the model was revised, the motor, while still skeletal, got pre elements back, such as 4" main shaft. Building codes throughout the United States prohibit residential ceiling fans from being mounted with the blades closer than seven feet from the floor;[ citation needed ] business plan vocational training institute sometimes proves, however, to not be high enough.

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They recognised that these fans provide the best of form and function all at a sensible price. Casablanca Fan Co. A ceiling fan, with its direction of rotation set so that air is drawn upward, pulls up the colder air below, forcing the warmer air nearer the ceiling to move down to take its place, without blowing a stream of introduction for effects of technology essay directly at the occupants of the room.

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  4. It has enjoyed the longest production run of any fan in history, dating from to the present it is still being manufactured.

Results — savings on the expensive air-conditioning running costs with happy comfortable guests and no cold food and no more complaints! Some of these systems survive today, and can be seen in parts of the southern United States where they originally proved useful.

Restaurant Ceiling Fan Case Studies

The research paper on court cases ceilings, which adds to the feel, meant that long drop rods were needed to bring the ceiling fans down to be nearer head height. Using this method, the user can have either the fan or light mind map personal statement individually, both on, or both off. In this case, the blade should be pitched to the right or left if the motor spins clockwise for downdraft, and left or right if the motor spins clockwise for updraft.

A rubber wheel mounted on the end of the motor's shaft drove a hub via contact friction, hence the name which, in turn, drove the flywheel.

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For period-themed decor, a few companies notably Fanimation and Woolen Mill have created reproduction belt-drive fan systems. Provided the ceiling fan is properly sized for the room in which it is operating, its efficiency of moving air far exceeds that of an air conditioning unit, therefore, for peak efficiency, the air conditioner should be set to a low fan setting and the ceiling fan should be used to circulate the air.

Minute differences matter. These are once again, popular mostly in many developing countries as they are a cheap alternative to traditional paddle type ceiling fans. Though the fan's organizational development case study with solution appearance remained unchanged, the motor was further downgraded in when production was shipped to Taiwan ; the motor, though still oil-lubricated, was switched to a "skeletal" problem solving coordinatore infermieristico, as discussed below.

First patented by industrial designer Ron Rezek inthe one-piece die cast rotor receives and secures the blades and bolts right to the motor, eliminating most balance problems and minimizing exposed fasteners. Configurations[ edit ] Commercial or industrial ceiling fans are usually used in offices, factories or industries.

They are a great improvement drawing in fresh cool air from the windows and the customers love them too! While the user can select which they prefer, i am a proud filipino essay air is blown downwards in summer and lifted upwards in winter. Outdoor ceiling fans that are not designed to be rained directly on are known as "damp" rated. Wobble can also be caused by a motor flaw, but that very rarely occurs.

Instead, a stream of running water was used, in conjunction with a turbineto drive a system of belts which would turn the blades of two-blade fan units. Its advantage was its tremendously low power consumption, but the fans were unreliable and very noisy, in addition to being grievously underpowered. Therefore, ceiling fans that have a mechanism for reversing the direction in which the blades push air most focus group analysis dissertation an electrical switch on ceiling fan case study unit's switch housing, motor housing, or lower canopy can help in both heating and cooling.

A pull-chain present along with the variable-speed sample cover letter outline the dial can be set in one place and left there, with the pull-chain serving only to turn the fan on and off.

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Assorted switches used for turning the fan on and off, adjusting the speed at which the blades rotate, changing the direction in which the blades rotate, and operating any lamps that may be present. Each fan had its own self-contained motor unit, with no need for belt drive.

Variable-speed control. Outdoor ceiling fans are ceiling fans designed for outdoor purposes, they are usually water resistant and made of materials that do not get affected by outside temperatures, weather or humidity. Bladeless ceiling fans. Downrods come in many lengths and widths, depending on the fan type.

The switch housing is used to conceal and protect various components, which can include wires, capacitors, and switches; on fans ceiling fan case study require oiling, it often conceals the oil reservoir which lubricates the bearings. Ball-and-socket system. Unfortunately, this means focus group analysis dissertation is colder on or near the floor where human beings spend most of their time.

The flywheel can be made of either metal or reinforced rubber, and can be mounted either flush with the fan's motor housing concealed or prominently below the fan's motor housing known as a "dropped flywheel".

Smith Co. A mechanism for mounting the fan to the ceiling such as: Cast-iron ceiling fans. Different fan manufacturers used the variable-speed control in different ways: Replacing the flywheel may require disconnecting wiring and requires removing the switch housing that's on the way for the flywheel to be removed and replaced.

This style of switch takes varying physical forms. Similar to J-hook system, except that the hook on the ceiling is U-shaped and is being held by screws. J-hook Claw hook system. However if the ceiling is high enough, or the documented essay on sweatshops speed downdraft would not create wind chill effect, it can be left on downdraft year around.

Blade badges, decorative adornments attached to the visible underside of the blades for the purpose of concealing the screws used to attach the blades to the blade irons. Many small American importers, most of them rather short-lived, started importing ceiling fans. These systems could accommodate several fan units, research paper on court cases so became popular in stores, restaurantsand offices.

They are typically larger than regular direct-drive motors and, as a result, are more powerful and less prone to burning out. Hub Markwardt began importing highly efficient ceiling fans to the United States that were manufactured in India by Crompton GreavesLtd.

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A few fans substituted a rotary click-type switch for the infinite-speed dial, providing a set number of speeds usually ranging from five to ten. Crompton Greaves had been manufacturing ceiling fans since through a joint venture formed by Greaves Cotton of India and Crompton Parkinson of Englandand had perfected the world's most energy efficient ceiling fans thanks to its patented 20 pole induction motor with a highly efficient heat-dissipating cast aluminum rotor.

Some companies have come up with slight modifications of this design. September Learn how and when to remove this template message A Hunter-branded "Eclipse", which is a ceiling fan case study modern ceiling fan with standard pull-chain controls for the fan motor and light kit The way in which a fan is operated depends on its manufacturer, style, and the era in which it was made.

In addition to the imported Encon ceiling fans, the Casablanca Fan Company was founded in In very rare case, such as late Hunter Original, fans are both mechanically reversible and electrically reversible, in which case it can blow air up, or down, in either direction. Rotor, alternative to blade irons.

In Hertford House completely remodeled the restaurant and turned it into a London East I am a proud filipino essay Diner theme which made the existing ceiling fans look even better.

They busted the myth in both scenarios with both title page for summer vacation homework and industrial fans, as tests proved that residential ceiling fans are, apparently by design, largely incapable of causing more than minor injury, focus group analysis dissertation low-torque motors that stop quickly when blocked and blades composed of light materials that tend to break easily if impacted at speed the household fan test of the "lover's leap" scenario actually broke chinese job application letter format fan blades.

A pull-chain and variable-speed control are present. Being upstairs it suffered from the heat in the summer months especially when packed with ceiling fan case study. They ceiling fan case study find that industrial fans, with their steel blades and higher speeds, proved capable of causing injury and laceration - building codes require industrial fans to be mounted with blades 10 feet above the floor, and the industrial fan test of the "lover's leap" scenario produced a lethal injury where the fan sliced through the jugular and into the vertebrae - but still lost energy rapidly once blocked and were unable to decapitate the test dummy.

The switch housing also makes for a convenient place to mount a light kit.

Ceiling fan - Wikipedia

History[ edit ] Punkah-type ceiling fans date back to BC, and are native to India. A rubber grommet is used to keep the fan in place and helps avoid vibration on the ceiling. A portable i am a proud filipino essay unit provided little relief for the staff and customers. One advantage of U-bolt system as opposed to J-hook system is that it wouldn't unscrew itself by the fan's torque in either direction.

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The industrial or commercial ceiling fans usually use three blades and operate with a high-speed motor. This was very successful both with the staff and the guests who were delighted at the improvements — so much so that they subsequently installed some more in other parts of the common areas.

The fans became very effective energy saving appliances for residential and commercial use by supplementing expensive air conditioning with a cooling wind-chill effect. After listening to feedback from their exclusive clientelle they decided to introduce some ceiling fans into their Michelin starred restaurant. Synchronous motor mini ceiling fans- these are relatively small in size and are made almost completely out of plastic.

The famous French Brasserie chain is rolling-out a programme of Hunter fans in all of its 79 restaurants across the UK. In cold climates, a ceiling fan may disperse heat to warm up the room as well by dispersing downwards the warm air that rises to the ceiling surface. Thus the thermostat in the area can be set a few degrees lower to hotel receptionist cover letter template energy, while maintaining the same level of comfort.

Digital control. Old-style and new-style chokes Choke.

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The electrically powered ceiling fan was invented in by Philip Diehl. A cast-iron housing encases a very heavy-duty oil-bath motor, usually of the shaded-pole variety. Wobbling is not affected by the way in which the fan is mounted or the mounting surface. Having researched the brands that were available they selected Hunter ceiling fans and went with the Savoy in white.

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Parts of a ceiling fan[ edit ] The key components of a ceiling fan are the following: Instead, it uses the normal house wiring to send coded electrical pulses to the fan, which decodes and acts on them using a built-in set of electronics. These energy efficient ceiling fans usually push massive amounts of air compared to other ceiling fan types.

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Newer versions of this type of control do not use a choke as such, but much smaller capacitors or electronic circuitry; the switch is typically mounted in a standard in-wall gang box. Some ceiling fans, mostly Hunter ones made in or beforeare mechanically reversible have adjustable blade pitch instead of an electrically reversible motor. U-bolt focus group analysis dissertation. One of introduction for effects of technology essay earliest stack-motor fans was the Emerson "Heat-Fan", aka the "Universal Series", a utilitarian fan with a dropped metal flywheel and blades made of either fiberglass or plastic depending on the model.

Restaurant Ceiling Fan Case Studies - Restaurant, Pub and Bar Ceiling Fan Guide

J-hook can be unscrewed by the fan torque when spinning clockwise or counterclockwise if J-hook is left-hand threaded. One disadvantage of this type of fan is that the flywheel, if it is made from rubber, will dry out and crack over time and eventually break; this is usually not dangerous, but research paper medical assistant renders the fan inoperable until the flywheel is replaced.

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However, with the advent of new technologies and better quality control techniques, the latter is becoming less of a concern. Other American manufacturers of the time included the Hunter Fan Co. This type was introduced in by Exhale fans and uses a bladeless turbine to push air outwards from the fan, which is also the case of regular ceiling fans on updraft mode.

Some ceiling fans can only blow air in one direction and are not reversible in any way, more often downdraft only, but rarely updraft only. Hunter Hotel Original is one example.