Wednesday, November 19, 2014
Agitator
Washing machine agitators can damage clothes.
Using an automatic washing machine is easier than beating your dirty laundry on a rock, but if you want to get your clothes clean, your machine has to somehow emulate the age-old motion of hand washing. Agitators and impellers are devices that top-loading washers use to move clothes during the wash cycles and, in the process, get rid of dirt and stains.
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Agitators
An agitator is a spindle that sticks up in the center of an automatic washing machine's wash drum. The agitator is usually equipped with fins or vanes, and it twists and turns during the machine's wash cycle, moving clothes through the water and, ideally, removing dirt from them. The motion of the agitator varies depending on the selected wash mode, so a delicate wash cycle is gentler than a standard wash cycle. In general, agitators are hard on clothes.
Impellers
An impeller is a low-profile rotating hub that replaces the agitator in some washing machine models. The vanes of the impeller create turbulent currents in the wash water as the impeller rotates. In theory, these currents move the clothes through the water and clean them without the impeller making physical contact with the clothes. The impeller also takes up less space in the center of the drum, making impeller machines easier to load than agitator machines.
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Efficiency
Impellers are often found in high-efficiency washing machine models that use less water than traditional models and rotate at higher speeds during spin cycles. The higher spin speeds extract more water from the clothes, so drying times are reduced. The combination of water and energy savings makes these washer models significantly more efficient than traditional models. However, the impeller itself does not add to the machine's efficiency, so unless it incorporates other efficient features, an impeller machine is not necessarily more efficient than an agitator machine.
Performance
Impeller machines are potentially less damaging to clothes, but because of the gentler motion, they may not clean clothes as effectively as agitator machines. Agitators are relatively brutal with clothes, but their twisting and turning tends to remove dirt quickly and completely. Some impeller models are also prone to tangling clothes as the impeller rotates, which can throw the machine out of balance, particularly during the high-speed spin cycle of high-efficiency machines.
About the Author
Evan Gillespie has been a journalist since 1996. His work has appeared in several Midwestern newspapers and magazines, as well as on various websites. He specializes in home, garden and arts journalism, and he holds a Master of Arts in art history from the University of Notre Dame.
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