Products > Dodgy Technology

Dyson V15 Vacuum Cleaner

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langwadt:

--- Quote from: SiliconWizard on July 27, 2021, 09:34:51 pm ---
--- Quote from: langwadt on July 27, 2021, 05:37:35 pm ---
--- Quote from: SiliconWizard on July 27, 2021, 04:41:42 pm ---
--- Quote from: james_s on July 26, 2021, 11:56:12 pm ---Yeah I don't know of any plug-in vacuum cleaners that use brushless motors although I'm sure it will happen at some point, the motors and controllers have gotten so cheap and they're a lot quieter

--- End quote ---

So cheap? Nah. Low power brushless motors have become cheap, sure. The ones you would use on a small RC model.
For the kind of power you need for a vacuum cleaner, they are definitely NOT cheap, and in any case a lot more expensive than the brushed alternatives. Consider that a typical decent mains vacuum cleaner has an 2000 W motor, or so.

--- End quote ---

afaik EU now limits vacuum cleaners to 900W and 80dB

--- End quote ---

Ah, really. I have a 2000W LG vacuum cleaner that still works great. Noise I don't know for sure, but I don't think it exceeds 80 dB, or not by much.

Unless manufacturers can manage to design something as effective with only 900W, then I'm happy to have bought it before. Dang. |O

--- End quote ---

afaiu at one point EU mandated an "effectivity" rating on vacuums but it was removed because Dyson won a lawsuit against it.
He did not see it as fair to bagless vacuums since bagged vaccuums was only measured with an empty bag

james_s:
It's hard to quantitatively measure the efficacy of a vacuum cleaner, it depends so much on the specific conditions. Seems a bit silly to mandate energy efficiency for something like that though. A typical vacuum cleaner probably gets run an hour or less a month. My vacuum could draw 20kW and while plugging it in and lugging around the power cord would be inconvenient, I doubt I'd notice the difference on my utility bill. I doubt I even run my upright vacuum that often even, I have a Roomba on each level that run on schedule and do a lot of the maintenance cleaning. 

langwadt:

--- Quote from: james_s on July 28, 2021, 12:43:49 am ---It's hard to quantitatively measure the efficacy of a vacuum cleaner, it depends so much on the specific conditions. Seems a bit silly to mandate energy efficiency for something like that though. A typical vacuum cleaner probably gets run an hour or less a month. My vacuum could draw 20kW and while plugging it in and lugging around the power cord would be inconvenient, I doubt I'd notice the difference on my utility bill. I doubt I even run my upright vacuum that often even, I have a Roomba on each level that run on schedule and do a lot of the maintenance cleaning.

--- End quote ---

EU mandated that the rear lights on cars be off in day time to save energy, resulting in people driving around with no rear lights because they
forgot to turn on the main light when it got dark. So it is now required that new cars have no rear lights in the day and automatically turns on
the main lights when dark

all to save, what, 20W (before LEDs)


Kleinstein:
With the vaccum cleaners the constructions got crazy: just before the regulations came up the manufacturers got into ever higher power rating by making the motor cooling more efficient and the actual efficiency worse. The consumed power was just missleading the consumers and had very little to do with the actual air flow.  So a new 800 W cleaner may actual work better than the old 2000 W example.
The power limit may be a bit drastic, but it worked well.  The better alternative may have been to require realistic data one the air flow instead of the electrical power consumption.

With cars we asume lower consumption to be better - wie a vaccum cleaner for some reason they made is think more consumption is better  :popcorn:.

SiliconWizard:

--- Quote from: james_s on July 28, 2021, 12:43:49 am ---It's hard to quantitatively measure the efficacy of a vacuum cleaner, it depends so much on the specific conditions. Seems a bit silly to mandate energy efficiency for something like that though. A typical vacuum cleaner probably gets run an hour or less a month. My vacuum could draw 20kW and while plugging it in and lugging around the power cord would be inconvenient, I doubt I'd notice the difference on my utility bill. I doubt I even run my upright vacuum that often even, I have a Roomba on each level that run on schedule and do a lot of the maintenance cleaning.

--- End quote ---

I agree. This is just greenish wank, coming from people with more ideology than pragmatism and essentially knowing life through Excel sheets.

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