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 Posted: Thu Jun 26, 2008 4:15 pm Post subject: How many cfm can a typical hair dryer blow? |
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I think it's somewhere between 10 cubic feet per minute (cfm) and 100
cfm, but can anyone give me a more precise value?
Anyone have a hair dryer manual, a link to specs, ???
Thanks,
Michael |
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| Posted: Thu Jun 26, 2008 5:55 pm Post subject: Re: How many cfm can a typical hair dryer blow? |
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On Jun 26, 10:43 am, "Spaceman" <space...@yourclockmalfunctioned.duh>
wrote:
| Quote: |
Cwatters wrote:
mrdarr...@gmail.com> wrote in message
news:931d78ad-77dd-40bc-805e-dad4e69fe3bc@x19g2000prg.googlegroups.com...
I think it's somewhere between 10 cubic feet per minute (cfm) and 100
cfm, but can anyone give me a more precise value?
Anyone have a hair dryer manual, a link to specs, ???
Thanks,
Michael
If you know the wattage of the hair dryer and you can measure the
temperature rise you can work out the cfm easily.
???
He is asking for cubic feet of air isn't he?
Why bother with heat at all?
To get a roundabout figure.
Place a plastic bag that holds ten cubic feet of air
or larger,
tape the bag around the output nozzle.
turn on and time the fill rate til it is full and stop your watch.
That will give you 10 cubic foot per "time"
or whatever size bag you have per time.
do the easy math to convert to cfm..
:)
Be sure you have it on "cold setting" if you have it on too long.
or be sure to be carefull enough to not melt the bag if only hot is
available.
Gotta love physical experimentation and basic math.
It is way more fun than "math only stuff".
:)
--
James M Driscoll Jr
Spaceman
|
Trash bag... great idea. I never thought of that. I was thinking of
a Ziplok bag, and measuring for < 1 second... not too accurate...
Thanks,
Michael |
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| Posted: Thu Jun 26, 2008 6:20 pm Post subject: Re: How many cfm can a typical hair dryer blow? |
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On Jun 26, 10:11 am, "Cwatters"
<colin.wattersNOS...@TurnersOakNOSPAM.plus.com> wrote:
| Quote: |
mrdarr...@gmail.com> wrote in message
news:931d78ad-77dd-40bc-805e-dad4e69fe3bc@x19g2000prg.googlegroups.com...
I think it's somewhere between 10 cubic feet per minute (cfm) and 100
cfm, but can anyone give me a more precise value?
Anyone have a hair dryer manual, a link to specs, ???
Thanks,
Michael
If you know the wattage of the hair dryer and you can measure the
temperature rise you can work out the cfm easily.
Google "specific heat capacity" or see...
http://en.wikipedia.org/wiki/Heat_capacity#Heat_capacity
|
Ah, I see, I didn't describe the problem adequately. The posted
wattage of the hair dryer is kind of irrelevant because I ripped out
the heating element from a surplus hair dryer. I discovered the
blower operates on 12V, 1A. So it's this cold air I was trying to
analyze.
Uncle Al had a good point, use muffin fans instead (one of his sites
said hair dryer motors work only for a few hundred hours, vs.
thousands of hours for a muffin fan). Muffin fans routinely post
their CFM specs. So now I can move on...
Michael |
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dlzc
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| Posted: Thu Jun 26, 2008 6:59 pm Post subject: Re: How many cfm can a typical hair dryer blow? |
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Dear mrdarr...:
On Jun 26, 11:20 am, mrdarr...@gmail.com wrote:
...
| Quote: |
Uncle Al had a good point, use muffin fans instead
(one of his sites said hair dryer motors work only
for a few hundred hours, vs. thousands of hours for
a muffin fan). Muffin fans routinely post their
CFM specs. So now I can move on...
|
Remember to check delta-p... they don't do well at all as "vacuum
cleaners" or "forced air blowers. The squirrel cage of the hair dryer
is better for pressure work, even if the motor is designed to merely
outlast the interest of the one that uses it.
How much air do you need to move? What sort of things are you going
to expect to do with the air?
"ring compressors" are pretty good, if you need either a mild vacuum
or pressure (a few feet of water). Some selections in Grainger.
David A. Smith |
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Cwatters
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| Posted: Thu Jun 26, 2008 10:11 pm Post subject: Re: How many cfm can a typical hair dryer blow? |
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<mrdarrett@gmail.com> wrote in message
news:931d78ad-77dd-40bc-805e-dad4e69fe3bc@x19g2000prg.googlegroups.com...
| Quote: |
I think it's somewhere between 10 cubic feet per minute (cfm) and 100
cfm, but can anyone give me a more precise value?
Anyone have a hair dryer manual, a link to specs, ???
Thanks,
Michael
|
If you know the wattage of the hair dryer and you can measure the
temperature rise you can work out the cfm easily.
Google "specific heat capacity" or see...
http://en.wikipedia.org/wiki/Heat_capacity#Heat_capacity |
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Uncle Al
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Spaceman
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| Posted: Thu Jun 26, 2008 10:43 pm Post subject: Re: How many cfm can a typical hair dryer blow? |
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Cwatters wrote:
| Quote: |
mrdarrett@gmail.com> wrote in message
news:931d78ad-77dd-40bc-805e-dad4e69fe3bc@x19g2000prg.googlegroups.com...
I think it's somewhere between 10 cubic feet per minute (cfm) and 100
cfm, but can anyone give me a more precise value?
Anyone have a hair dryer manual, a link to specs, ???
Thanks,
Michael
If you know the wattage of the hair dryer and you can measure the
temperature rise you can work out the cfm easily.
|
???
He is asking for cubic feet of air isn't he?
Why bother with heat at all?
To get a roundabout figure.
Place a plastic bag that holds ten cubic feet of air
or larger,
tape the bag around the output nozzle.
turn on and time the fill rate til it is full and stop your watch.
That will give you 10 cubic foot per "time"
or whatever size bag you have per time.
do the easy math to convert to cfm..
:)
Be sure you have it on "cold setting" if you have it on too long.
or be sure to be carefull enough to not melt the bag if only hot is
available.
Gotta love physical experimentation and basic math.
It is way more fun than "math only stuff".
:)
--
James M Driscoll Jr
Spaceman |
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Spaceman
Guest
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| Posted: Thu Jun 26, 2008 11:14 pm Post subject: Re: How many cfm can a typical hair dryer blow? |
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mrdarrett@gmail.com wrote:
| Quote: |
On Jun 26, 10:43 am, "Spaceman" <space...@yourclockmalfunctioned.duh
wrote:
Cwatters wrote:
mrdarr...@gmail.com> wrote in message
news:931d78ad-77dd-40bc-805e-dad4e69fe3bc@x19g2000prg.googlegroups.com...
I think it's somewhere between 10 cubic feet per minute (cfm) and
100 cfm, but can anyone give me a more precise value?
Anyone have a hair dryer manual, a link to specs, ???
Thanks,
Michael
If you know the wattage of the hair dryer and you can measure the
temperature rise you can work out the cfm easily.
???
He is asking for cubic feet of air isn't he?
Why bother with heat at all?
To get a roundabout figure.
Place a plastic bag that holds ten cubic feet of air
or larger,
tape the bag around the output nozzle.
turn on and time the fill rate til it is full and stop your watch.
That will give you 10 cubic foot per "time"
or whatever size bag you have per time.
do the easy math to convert to cfm..
:)
Be sure you have it on "cold setting" if you have it on too long.
or be sure to be carefull enough to not melt the bag if only hot is
available.
Gotta love physical experimentation and basic math.
It is way more fun than "math only stuff".
:)
--
James M Driscoll Jr
Spaceman
Trash bag... great idea. I never thought of that. I was thinking of
a Ziplok bag, and measuring for < 1 second... not too accurate...
Thanks,
|
No prob,
have fun
and of course. never be stupid, but crazy is OK.
:)
--
Crazy but not stupid
James M Driscoll Jr
Spaceman |
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Cwatters
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| Posted: Thu Jun 26, 2008 11:31 pm Post subject: Re: How many cfm can a typical hair dryer blow? |
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"Spaceman" <spaceman@yourclockmalfunctioned.duh> wrote in message
news:k_-dnf9X08oHSP7VnZ2dnUVZ_hCdnZ2d@comcast.com...
| Quote: |
He is asking for cubic feet of air isn't he?
Why bother with heat at all?
To get a roundabout figure.
Place a plastic bag that holds ten cubic feet of air
or larger,
tape the bag around the output nozzle.
turn on and time the fill rate til it is full and stop your watch.
That will give you 10 cubic foot per "time"
or whatever size bag you have per time.
do the easy math to convert to cfm..
:)
Be sure you have it on "cold setting" if you have it on too long.
or be sure to be carefull enough to not melt the bag if only hot is
available.
Gotta love physical experimentation and basic math.
It is way more fun than "math only stuff".
:)
--
James M Driscoll Jr
Spaceman
|
Good thinking batman err I mean Spaceman. |
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Brian Whatcott
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| Posted: Fri Jun 27, 2008 5:23 am Post subject: Re: How many cfm can a typical hair dryer blow? |
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On Thu, 26 Jun 2008 09:15:19 -0700 (PDT), mrdarrett@gmail.com wrote:
| Quote: |
I think it's somewhere between 10 cubic feet per minute (cfm) and 100
cfm, but can anyone give me a more precise value?
Anyone have a hair dryer manual, a link to specs, ???
Thanks,
Michael
|
The Parlux 1900 watt model (in black) proclaims its flow as above
average at 69 cu meter/hr which runs out at 41 cu ft/min
Brian W |
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Guest
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| Posted: Fri Jun 27, 2008 5:28 pm Post subject: Re: How many cfm can a typical hair dryer blow? |
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On Jun 26, 5:23 pm, Brian Whatcott <betw...@sbcglobal.net> wrote:
| Quote: |
On Thu, 26 Jun 2008 09:15:19 -0700 (PDT), mrdarr...@gmail.com wrote:
I think it's somewhere between 10 cubic feet per minute (cfm) and 100
cfm, but can anyone give me a more precise value?
Anyone have a hair dryer manual, a link to specs, ???
Thanks,
Michael
The Parlux 1900 watt model (in black) proclaims its flow as above
average at 69 cu meter/hr which runs out at 41 cu ft/min
Brian W
|
Yep I see it now...
http://www.jasonshankey.co.uk/product.cfm/product/3367
Thanks,
Michael |
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