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Anonymous Poster #1

Relationship Between Airflow/Suction/Wattage

10/30/2011 9:21 PM

Please could I be told the relationship between Airflow/Suction/Wattage in regards of vacuum cleaners. These are often refered to by wattage, but I understand that a higher wattage doesn't necessarily mean more airflow or better suction.
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Tobugrynbak
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#2

Re: Relationship Between Airflow/Suction/Wattage

10/31/2011 4:25 AM

It has always amused me how they "rate" a vacuum cleaners performance by the wattage the motor draws.

In Oz the standard power point is rated to 240Vac 10Amps (50Hz) so the "theoretical" limit to the power draw is 2400 Watts per power point.

Up until recently the average good vacuum cleaner was rated with a 1800/ 2000 Watt motor (think Electrolux/Miele/Dyson/Hoover et al) I spotted a Dyson clone which claimed a powerfull 2800 Watt motor as one of its features.

I like a clean house, but not one where half of my powerpoints are melted by my vacuum cleaner, bad enough my stick welder taking out the one in the garage.....

I suspect the rating is somewhat bogus a bit like dodgy stereos with the claim of 800Watts Peak Music Power while running on 6 AA cells.....

Unfortunately the average punter can't get their head around cubic feet/metres a minute where as Watts has a ready recognised (personal) reference, and one that can be "manipulated" by the marketing dept.

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Tornado
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#3

Re: Relationship Between Airflow/Suction/Wattage

10/31/2011 4:54 AM

W = k Q ΔP/η. Hint: η is key.

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