hi,

this is a much awaited reply of the post longwaited replies by ZERO.

I appreciate your endevour in digging out information and viewing the whole thing scientifically.

Your calculations are well performed and what i understand as a jist of it ,that human power can be limited upto 500 watts,but a vaccum cleaner may require upto 2200 watts,right?

But what i fail to understand is that how vaccum cleaner may run on just 150 watts?

I checked Eureka forbes website(http://www.eurekaforbes.com/products/product.php?catid=34&&prid=22)
and(http://www.eurekaforbes.com/products/product.php?catid=34&&prid=21)

and found this data:

For some product of theirs:

Rated Voltage 230 V AC, 50 Hz
Rated Current 0.65 amps
Rated Power 150 watts
Maximum Suction 4116 Pascals
(420 mm water column)
Dimension (l*d*h) 480 * 100 * 100 mm
Net Weight (main unit) 1.10 kg
Std. Accessories 4

And yet for another product,what you said was true:

Voltage 230 V AC, 50 HZ
Input power 2100 Watts
Suction 1600 mm/H20 or 15680 Pascals
Dimension (L * B * H) 400 * 355 * 500 mm
Net Weight 14.2 Kg

It boggles me how the first one runs on 150 watts power.
So,i think it might just not be impossible to build a mechanical vaccum cleaner.

What say?
Hugs for a great new year,
sameer