The fanboy-ism on these things is comical.
Buffeting. I L’dOL.
I have a $16 20" Lasko from Home Depot circulating the air in my entire 2600sq.ft. house in FL. On low.
Bonus: the little white noise it does put out makes me sleep like a baby…
njitman
October 23, 2013, 10:22am
22
Basically these fans are just fraudulent marketing. Dyson fans work by transforming the airflow from a tiny blower in the base into a narrow laminar flow from the ring. In the process, air is forced through a tiny, constricted plenum. This creates back pressure, limits air flow, and partially accounts for the relatively high noise level (compared to air output).
The actual CFM rating of the fan is the same as the tiny blower in the base. Now Dyson won’t tell you the CFM, they’ll only tell you gallons per second. Multiply this by 8 to get CFM. Energy and momentum are conserved - this thing doesn’t miraculously create more energy.
Now the phenomenon of “air multiplication” is real, but it’s not what Dyson wants you to think it is. It works through a principle called entrapment, where adjacent air molecules move due to friction. This is used in some industrial applications. One example is an air multiplication nozzle used on process lines. You hook compressed air to it, and it outputs a beautifully smooth and dispersed airflow. The output airflow is no greater than the input, but the transformation is useful for example in drying applications.
Similarly, much of the energy of the air molecules leaving the Dyson ring is transferred to adjacent molecules. But, just as you learned in high school physics class, there ain’t no such thing as a free lunch (TANSTAAFL). Those incident air molecules lose a corresponding amount of energy. What you are left with is a relatively smooth, albeit slow volume of air.
Dyson’s marketing is admirable, but these are bottom line incredibly overpriced and ridiculously weak fans. For less than half this price, I picked up one of those Woot tower vornado’s. It moves almost ten times as much air as the Dyson.
Why do I know these things? I manage people in a large, high end tech company that include thermal design engineers. If there was some black magic in air multiplication which allowed us to get more air energy out than was drawn in by the air mover, we’d use it to save enormous amounts of fan power to cool electronics. But it doesn’t and so we don’t. I’ve even reviewed Dyson’s patents just for fun. We just have a good laugh at how Dyson can get away with these fraudulent performance claims.
If you want airflow - check out this fan. Everyone in our family likes the white noise of a fan at night, so I hook these up during the winter when the A/C is off.
http://www.amazon.com/gp/product/B000BO58PC/ref=wms_ohs_product?ie=UTF8&psc=1
It will knock a small cat over on high setting.
BTW: I have the Dyson AM04, which is the AM02 plus a heater. Our home gym is in our basement and the room gets cold in the winter. The AM04 provides the right amount of heat and disperses it very well. Bought it on ebay for $149, factory reconditioned. The one I got did not work, but Dyson did eventually send me a new one (3 months). I bought a purple one, I think that is why it was so cheap. Dyson had none in refurb stock, so they made we wait until they manufacturer more and sent me a new one. Would I pay the normal price for these fans, heater or not, NO WAY. Same for their vacuums. We have one that is probably 8 years old, still works good, but when it breaks, I think the Shark Navigator will be our next vacuum.
adr5
October 23, 2013, 11:49am
23
Only issue I have with this is that it could be a fad like the ionic fans of yester years when it was discovered the O3 that it puts out is bad for your lungs since we were breathing in ozone. Any thoughts on this?
You have nothing to worry about. Don’t fall for all the ad speak. There is a fan in the base and the output is funneled through that oval plastic device. Nothing more.
If you want airflow - check out this fan. Everyone in our family likes the white noise of a fan at night, so I hook these up during the winter when the A/C is off.
http://www.amazon.com/gp/product/B000BO58PC/ref=wms_ohs_product?ie=UTF8&psc=1
It will knock a small cat over on high setting.
BTW: I have the Dyson AM04, which is the AM02 plus a heater. Our home gym is in our basement and the room gets cold in the winter. The AM04 provides the right amount of heat and disperses it very well. Bought it on ebay for $149, factory reconditioned. The one I got did not work, but Dyson did eventually send me a new one (3 months). I bought a purple one, I think that is why it was so cheap. Dyson had none in refurb stock, so they made we wait until they manufacturer more and sent me a new one. Would I pay the normal price for these fans, heater or not, NO WAY. Same for their vacuums. We have one that is probably 8 years old, still works good, but when it breaks, I think the Shark Navigator will be our next vacuum.
I had a fan very similar to that one (might have been an older model, but the form factor was almost identical) and the thing was a BEAST!
Psh… enjoy your buffeted air peasant.
While your fan tosses air at you in large brick like chunks those who prefer the better things in life will be basking in a comforting unbroken stream of air like a lover blowing on your neck uninterrupted for as long as you want.
Plus you can throw balloons through it.- YouTube
Sorry it took so long for me to respond to this, but I had to throw up first.
luke975
October 23, 2013, 6:54pm
26
Basically these fans are just fraudulent marketing. Dyson fans work by transforming the airflow from a tiny blower in the base into a narrow laminar flow from the ring. In the process, air is forced through a tiny, constricted plenum. This creates back pressure, limits air flow, and partially accounts for the relatively high noise level (compared to air output).
The actual CFM rating of the fan is the same as the tiny blower in the base. Now Dyson won’t tell you the CFM, they’ll only tell you gallons per second. Multiply this by 8 to get CFM. Energy and momentum are conserved - this thing doesn’t miraculously create more energy.
Now the phenomenon of “air multiplication” is real, but it’s not what Dyson wants you to think it is. It works through a principle called entrapment, where adjacent air molecules move due to friction. This is used in some industrial applications. One example is an air multiplication nozzle used on process lines. You hook compressed air to it, and it outputs a beautifully smooth and dispersed airflow. The output airflow is no greater than the input, but the transformation is useful for example in drying applications.
Similarly, much of the energy of the air molecules leaving the Dyson ring is transferred to adjacent molecules. But, just as you learned in high school physics class, there ain’t no such thing as a free lunch (TANSTAAFL). Those incident air molecules lose a corresponding amount of energy. What you are left with is a relatively smooth, albeit slow volume of air.
Dyson’s marketing is admirable, but these are bottom line incredibly overpriced and ridiculously weak fans. For less than half this price, I picked up one of those Woot tower vornado’s. It moves almost ten times as much air as the Dyson.
Why do I know these things? I manage people in a large, high end tech company that include thermal design engineers. If there was some black magic in air multiplication which allowed us to get more air energy out than was drawn in by the air mover, we’d use it to save enormous amounts of fan power to cool electronics. But it doesn’t and so we don’t. I’ve even reviewed Dyson’s patents just for fun. We just have a good laugh at how Dyson can get away with these fraudulent performance claims.
thanks. I enjoyed reading information from someone that actually looked at this from a more technical point of view.
pheria
October 23, 2013, 11:52pm
27
10 minutes to go and still undecided. Hmmm.
A Vornado seems like it would be quieter and move more air (also cheaper). But this would look much better in any room. I wish I could try out how well it works first.
Mine came today and it is beyond a few scratches. It’s broke! The base is bent and cracked. The pretty blue fan part has quite a few scratches and chips. Not pretty at all. I contacted Dyson, they say contact Woot and I did. Now I see what happens next. I’ll let you all know. Normally I don’t mind refurbs but now I wonder. We’ll see.
Mine came today and it is beyond a few scratches. It’s broke! The base is bent and cracked. The pretty blue fan part has quite a few scratches and chips. Not pretty at all. I contacted Dyson, they say contact Woot and I did. Now I see what happens next. I’ll let you all know. Normally I don’t mind refurbs but now I wonder. We’ll see.
So sorry about that. I wonder if it took a beating in shipment? Either way, CS will take care of you.