Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles and
since it requires
more ventilation I can't decide if I should put additional wind turbines
or have a solar fan installed instead. Our electric bill is not that high
during the summer so I'm not sure if there is any benefit of having a
solar vent + we have plenty of wind to keep turbines rolling.

Any advice will be appreciated.

-------------------------------------




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texan1 wrote:
Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles and
since it requires
more ventilation I can't decide if I should put additional wind turbines
or have a solar fan installed instead. Our electric bill is not that high
during the summer so I'm not sure if there is any benefit of having a
solar vent + we have plenty of wind to keep turbines rolling.

Any advice will be appreciated.

Aren't wind turbines noisy?
What happens to them in high winds?

Lou

(texan1) wrote in
m:

Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles and
since it requires
more ventilation I can't decide if I should put additional wind turbines
or have a solar fan installed instead. Our electric bill is not that high
during the summer so I'm not sure if there is any benefit of having a
solar vent + we have plenty of wind to keep turbines rolling.

Any advice will be appreciated.

solar panels may not survive a storm;they can be broken,hail-damaged,etc.
They also get dirty and output drops until cleaned.

The wind turbine follows the KISS principle.



--
Jim Yanik
jyanik
at
kua.net

"texan1" wrote in message
m...
Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles and
since it requires
more ventilation I can't decide if I should put additional wind turbines
or have a solar fan installed instead. Our electric bill is not that high
during the summer so I'm not sure if there is any benefit of having a
solar vent + we have plenty of wind to keep turbines rolling.

Any advice will be appreciated.



I looked at solar powered vents too but I came to the conclusion they would
have to be replaced periodically. I bought wind turbines and then we got hit
by that hail storm in Austin. I had some roofers come out and one said he'd
install a ridge vent for free, with a new roof of course. (Lon Smith
Roofing, They are in Dallas too) I took that est. and called a local roofer
and he said he could match it. So I took the turbines back to Homedepot.

Problem with turbines is you have to put in so many. I have a small 1700 sq
ft house and the roofer told me I'd need 6 turbines.

Efficiency wise the ridge vent is supposed to be the best current technology
and can be installed for about $450 to $800 for a 36 ft ridge on a single
story. These are est. I got from two different roofers.

Let us know what you end up with.

od

On Apr 16, 10:20*am, (texan1) wrote:
Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles and
since it requires
more ventilation I can't decide if I should put additional wind turbines
or have a solar fan installed instead. Our electric bill is not that high
during the summer so I'm not sure if there is any benefit of having a
solar vent + we have plenty of wind to keep turbines rolling.

Any advice will be appreciated.

Since I live in the Dallas area as well, I have to comment on your
statement about having plenty of wind. YES, we have plenty of wind
right NOW but not necessarily during the hottest part of the summer.
The wind turbines will however work even in light or no wind
conditions if you have good soffit venting as well. The heat on the
roof will help to create a constant movement of air from the soffits
to the peak of the roof. The wind turbines will allow that hot air to
escape while pulling in air from the soffits. A solar powered fan
will produce a more active vent but only when the sun shines.

I used to have an electric powered vent that came on when the
temperature reached a certain point and would cut off when it cooled.
The problem with them was always NOISE! They were very noisy and so
the last time I had the roof replaced, I opted of the ridge vent
system instead. It works on the same principle as the turbine vents
and allows the hot air to excape while pulling cooler air from the
soffits. If you are replacing the roof anyway, that would be the way
I would go.

On Apr 16, 4:54*pm, BobR wrote:
On Apr 16, 10:20*am, (texan1) wrote:

Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles and
since it requires
more ventilation I can't decide if I should put additional wind turbines
or have a solar fan installed instead. Our electric bill is not that high
during the summer so I'm not sure if there is any benefit of having a
solar vent + we have plenty of wind to keep turbines rolling.

Any advice will be appreciated.

Since I live in the Dallas area as well, I have to comment on your
statement about having plenty of wind. *YES, we have plenty of wind
right NOW but not necessarily during the hottest part of the summer.
The wind turbines will however work even in light or no wind
conditions if you have good soffit venting as well. *The heat on the
roof will help to create a constant movement of air from the soffits
to the peak of the roof. *The wind turbines will allow that hot air to
escape while pulling in air from the soffits. *

I don't see that you get any mechanical advantage out of this scheme.
If there is enough wind blowing, I can see how a turbine vent can use
the wind power moving by the roof to move air out of the attic. It's
using the force of the wind as power. But I don't see how naturally
rising hot air moving from the soffit vents and up through the turbine
is doing any good beyond what just a plain similar size vent opening
would give. In fact, it would seem to be worse, because there is
some energy loss in friction, etc with the turbine.

In other words, in still air, I think you'd be better off with just a
ridge vent.



A solar powered fan
will produce a more active vent but only when the sun shines.

I used to have an electric powered vent that came on when the
temperature reached a certain point and would cut off when it cooled.
The problem with them was always NOISE! *They were very noisy and so
the last time I had the roof replaced, I opted of the ridge vent
system instead. *It works on the same principle as the turbine vents
and allows the hot air to excape while pulling cooler air from the
soffits. *If you are replacing the roof anyway, that would be the way
I would go.

Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles
and since it requires
more ventilation I can't decide if I should put additional wind
turbines or have a solar fan installed instead. Our electric bill is
not that high during the summer so I'm not sure if there is any
benefit of having a solar vent + we have plenty of wind to keep
turbines rolling.

The first time you install a wind turbine, you'll discover that the
rotation doesn't actually do anything, except maybe keep rain out. The
turbine isn't fastened to a fan of any kind, so the square inches of
pipe is the only thing you need to consider. You need to have roughly
the same number of square inches of exit for hot air at the top of the
roof as you have inlet for cool air under the eaves.

The guy who recommended ridge vents has the best solution.

--
Steve Bell
New Life Home Improvement
Arlington, TX USA

On Apr 16, 5:10*pm, wrote:
On Apr 16, 4:54*pm, BobR wrote:





On Apr 16, 10:20*am, (texan1) wrote:

Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles and
since it requires
more ventilation I can't decide if I should put additional wind turbines
or have a solar fan installed instead. Our electric bill is not that high
during the summer so I'm not sure if there is any benefit of having a
solar vent + we have plenty of wind to keep turbines rolling.

Any advice will be appreciated.

Since I live in the Dallas area as well, I have to comment on your
statement about having plenty of wind. *YES, we have plenty of wind
right NOW but not necessarily during the hottest part of the summer.
The wind turbines will however work even in light or no wind
conditions if you have good soffit venting as well. *The heat on the
roof will help to create a constant movement of air from the soffits
to the peak of the roof. *The wind turbines will allow that hot air to
escape while pulling in air from the soffits. *

I don't see that you get any mechanical advantage out of this scheme.
If there is enough wind blowing, I can see how a turbine vent can use
the wind power moving by the roof to move air out of the attic. *It's
using the force of the wind as power. * But I don't see how naturally
rising hot air moving from the soffit vents and up through the turbine
is doing any good beyond what just a plain similar size vent opening
would give. * In fact, it would seem to be worse, because there is
some energy loss in friction, etc with the turbine.

In other words, in still air, I think you'd be better off with just a
ridge vent.


If you read my last paragraph, I stated that I went with the ridge
vent as what I considered a better alternative. The design of the
wind turbines is not really all that good at "pulling" air up through
the attic and mostly turn in the wind. The real benefit to them is
providing an opening for the hot air to escape. I think that a simple
covered vent would probably work almost a good. The ridge vent
provides a much more effective area across the highest point of the
roof for the heat to escape.



A solar powered fan
will produce a more active vent but only when the sun shines.

I used to have an electric powered vent that came on when the
temperature reached a certain point and would cut off when it cooled.
The problem with them was always NOISE! *They were very noisy and so
the last time I had the roof replaced, I opted of the ridge vent
system instead. *It works on the same principle as the turbine vents
and allows the hot air to excape while pulling cooler air from the
soffits. *If you are replacing the roof anyway, that would be the way
I would go.- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

SteveBell wrote:
Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles
and since it requires
more ventilation I can't decide if I should put additional wind
turbines or have a solar fan installed instead. Our electric bill is
not that high during the summer so I'm not sure if there is any
benefit of having a solar vent + we have plenty of wind to keep
turbines rolling.

The first time you install a wind turbine, you'll discover that the
rotation doesn't actually do anything, except maybe keep rain out. The
turbine isn't fastened to a fan of any kind, so the square inches of
pipe is the only thing you need to consider. You need to have roughly
the same number of square inches of exit for hot air at the top of the
roof as you have inlet for cool air under the eaves.


This assertion can be debunked quite easily.

Simply stand under the turbine with a stick of incense and watch the smoke.
Then stop the turbine and watch the smoke again. In the former case, the
smoke is sucked out quite rapidly; in the latter case, the smoke goes
nowhere.

A ridge vent - or hole in the roof - depends on a temperature difference
between the air in the attic and that outside to generate convection
currents.

A 12" wind turbine will move about 350 CFM of air in a 5MPH wind,
irrespective of the temperature differential.

With no wind, the turbine acts like a ridge vent, dependent entirely on
convection currents.

BobR wrote:

I used to have an electric powered vent that came on when the
temperature reached a certain point and would cut off when it cooled.
The problem with them was always NOISE! They were very noisy and so
the last time I had the roof replaced, I opted of the ridge vent
system instead. It works on the same principle as the turbine vents
and allows the hot air to excape while pulling cooler air from the
soffits. If you are replacing the roof anyway, that would be the way
I would go.

My understanding is that turbine effect of wind turbines doesn't really
do anything. The hot air is actually removed by the thermal siphon
effect of hot air rising. That's why mostly they recommend ridge
vents these days.

Also as one responder mentioned, it takes a lot
of turbines to really be effective. When I had to replace one that
had failed I noticed on the box that they recommended 5 turbines
for a house my size. My house had 2. When I got a new roof last
year I went with ridge vents.

Bill

SteveBell wrote:
Seems like we need to replace a roof after most recent storm in
our (Dallas,TX) area.I'm thinking about putting impact resisting
shingles and since it requires
more ventilation I can't decide if I should put additional wind
turbines or have a solar fan installed instead. Our electric bill
is not that high during the summer so I'm not sure if there is any
benefit of having a solar vent + we have plenty of wind to keep
turbines rolling.

The first time you install a wind turbine, you'll discover that the
rotation doesn't actually do anything, except maybe keep rain out.
The turbine isn't fastened to a fan of any kind, so the square
inches of pipe is the only thing you need to consider. You need to
have roughly the same number of square inches of exit for hot air
at the top of the roof as you have inlet for cool air under the
eaves.

This assertion can be debunked quite easily.

Simply stand under the turbine with a stick of incense and watch the
smoke. Then stop the turbine and watch the smoke again. In the former
case, the smoke is sucked out quite rapidly; in the latter case, the
smoke goes nowhere.

A ridge vent - or hole in the roof - depends on a temperature
difference between the air in the attic and that outside to generate
convection currents.

A 12" wind turbine will move about 350 CFM of air in a 5MPH wind,
irrespective of the temperature differential.

With no wind, the turbine acts like a ridge vent, dependent entirely
on convection currents.

So what's the mechanism? How does the spinning top pull air out?

--
Steve Bell
New Life Home Improvement
Arlington, TX USA

On Apr 17, 10:05*am, "SteveBell" wrote:
SteveBell wrote:
Seems like we need to replace a roof after most recent storm in
our (Dallas,TX) area.I'm thinking about putting impact resisting
shingles and since it requires
more ventilation I can't decide if I should put additional wind
turbines or have a solar fan installed instead. Our electric bill
is not that high during the summer so I'm not sure if there is any
benefit of having a solar vent + we have plenty of wind to keep
turbines rolling.

The first time you install a wind turbine, you'll discover that the
rotation doesn't actually do anything, except maybe keep rain out.
The turbine isn't fastened to a fan of any kind, so the square
inches of pipe is the only thing you need to consider. You need to
have roughly the same number of square inches of exit for hot air
at the top of the roof as you have inlet for cool air under the
eaves.

This assertion can be debunked quite easily.

Simply stand under the turbine with a stick of incense and watch the
smoke. Then stop the turbine and watch the smoke again. In the former
case, the smoke is sucked out quite rapidly; in the latter case, the
smoke goes nowhere.

A ridge vent - or hole in the roof - depends on a temperature
difference between the air in the attic and that outside to generate
convection currents.

A 12" wind turbine will move about 350 CFM of air in a 5MPH wind,
irrespective of the temperature differential.

With no wind, the turbine acts like a ridge vent, dependent entirely
on convection currents.

So what's the mechanism? How does the spinning top pull air out?

Analogous to a flywheel and utilizes the Venturi effect.

R

SteveBell wrote:
..

Simply stand under the turbine with a stick of incense and watch the
smoke. Then stop the turbine and watch the smoke again. In the former
case, the smoke is sucked out quite rapidly; in the latter case, the
smoke goes nowhere.

A ridge vent - or hole in the roof - depends on a temperature
difference between the air in the attic and that outside to generate
convection currents.

A 12" wind turbine will move about 350 CFM of air in a 5MPH wind,
irrespective of the temperature differential.

With no wind, the turbine acts like a ridge vent, dependent entirely
on convection currents.

So what's the mechanism? How does the spinning top pull air out?

It's not a "spinning top." It's a fan.

A 12" wind turbine moves 350 CFM at a wind speed of 5mph, but it moves 1350
CFM at a wind speed of 15 mph. It should be obvious that, since its
effectiveness depends on the wind speed, it's more than a hole in the roof.

Here's the way I understand it works (and I could be wrong - the whole thing
may just be magic):

1. There's air in the turbine.
2. The wind spins the turbine.
3. The air in the turbine also spins is slung outward by centrifugal force.
The air exits the turbine thru the vanes.
4. This exiting air creates a vacuum in the space enclosed by the turbine.
5. The vacuum, in turn, sucks air from the underside (attic).

Both ridge vents and turbines have their relative advantages and
disadvantages. Turbines don't move much air when the wind doesn't blow;
ridge vents don't move much air in the winter.

In a light wind, turbines move considerably more air (about as much as a
robust bath exhaust fan) than a ridge vent

Both are cheap, both are passive, both trouble-free, and both use no energy.

I have ridge vents AND turbines on my house.

RicodJour wrote:
On Apr 17, 10:05 am, "SteveBell" wrote:
SteveBell wrote:
Seems like we need to replace a roof after most recent storm in
our (Dallas,TX) area.I'm thinking about putting impact resisting
shingles and since it requires
more ventilation I can't decide if I should put additional wind
turbines or have a solar fan installed instead. Our electric bill
is not that high during the summer so I'm not sure if there is any
benefit of having a solar vent + we have plenty of wind to keep
turbines rolling.
The first time you install a wind turbine, you'll discover that the
rotation doesn't actually do anything, except maybe keep rain out.
The turbine isn't fastened to a fan of any kind, so the square
inches of pipe is the only thing you need to consider. You need to
have roughly the same number of square inches of exit for hot air
at the top of the roof as you have inlet for cool air under the
eaves.
This assertion can be debunked quite easily.
Simply stand under the turbine with a stick of incense and watch the
smoke. Then stop the turbine and watch the smoke again. In the former
case, the smoke is sucked out quite rapidly; in the latter case, the
smoke goes nowhere.
A ridge vent - or hole in the roof - depends on a temperature
difference between the air in the attic and that outside to generate
convection currents.
A 12" wind turbine will move about 350 CFM of air in a 5MPH wind,
irrespective of the temperature differential.
With no wind, the turbine acts like a ridge vent, dependent entirely
on convection currents.
So what's the mechanism? How does the spinning top pull air out?

Analogous to a flywheel and utilizes the Venturi effect.

R

More info:
http://www.realvents.com/

In article ,
"HeyBub" wrote:

Simply stand under the turbine with a stick of incense

You misspelled "lit cigarette," cowboy. We'll let it go this time, but
jeez, be careful with the man image, there.

On Apr 17, 7:30*am, "HeyBub" wrote:
SteveBell wrote:
Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles
and since it requires
more ventilation I can't decide if I should put additional wind
turbines or have a solar fan installed instead. Our electric bill is
not that high during the summer so I'm not sure if there is any
benefit of having a solar vent + we have plenty of wind to keep
turbines rolling.

The first time you install a wind turbine, you'll discover that the
rotation doesn't actually do anything, except maybe keep rain out. The
turbine isn't fastened to a fan of any kind, so the square inches of
pipe is the only thing you need to consider. You need to have roughly
the same number of square inches of exit for hot air at the top of the
roof as you have inlet for cool air under the eaves.

This assertion can be debunked quite easily.

Simply stand under the turbine with a stick of incense and watch the smoke.
Then stop the turbine and watch the smoke again. In the former case, the
smoke is sucked out quite rapidly; in the latter case, the smoke goes
nowhere.

A ridge vent - or hole in the roof - depends on a temperature difference
between the air in the attic and that outside to generate convection
currents.

A 12" wind turbine will move about 350 CFM of air in a 5MPH wind,
irrespective of the temperature differential.

With no wind, the turbine acts like a ridge vent, dependent entirely on
convection currents.- Hide quoted text -

- Show quoted text -

The same mechanism also works with the ridge vents if there is wind.
The wind blowing against the roof will be forced up and over the roof
resulting in a low pressure zone on the back side of the roof. This
low pressure zone will draw the air up and out of the ridge vent even
more effectively than the wind turbine. So the result is that ridge
vents are not totally dependent on convection currents.

RicodJour wrote:
On Apr 17, 10:05 am, "SteveBell" wrote:
SteveBell wrote:
Seems like we need to replace a roof after most recent
storm in our (Dallas,TX) area.I'm thinking about putting
impact resisting shingles and since it requires
more ventilation I can't decide if I should put additional
wind turbines or have a solar fan installed instead. Our
electric bill is not that high during the summer so I'm not
sure if there is any benefit of having a solar vent + we
have plenty of wind to keep turbines rolling.
The first time you install a wind turbine, you'll discover
that the rotation doesn't actually do anything, except maybe
keep rain out. The turbine isn't fastened to a fan of any
kind, so the square inches of pipe is the only thing you need
to consider. You need to have roughly the same number of
square inches of exit for hot air at the top of the roof as
you have inlet for cool air under the eaves.
This assertion can be debunked quite easily.
Simply stand under the turbine with a stick of incense and
watch the smoke. Then stop the turbine and watch the smoke
again. In the former case, the smoke is sucked out quite
rapidly; in the latter case, the smoke goes nowhere.
A ridge vent - or hole in the roof - depends on a temperature
difference between the air in the attic and that outside to
generate convection currents.
A 12" wind turbine will move about 350 CFM of air in a 5MPH
wind, irrespective of the temperature differential.
With no wind, the turbine acts like a ridge vent, dependent
entirely on convection currents.
So what's the mechanism? How does the spinning top pull air out?

Analogous to a flywheel and utilizes the Venturi effect.

More info:
http://www.realvents.com/

I saw that page in my searching, but it just crows about how it's
"better", not explaining the physics.

Still searching since this is interesting.
--
Steve Bell
New Life Home Improvement
Arlington, TX USA

BobR wrote:
-

The same mechanism also works with the ridge vents if there is wind.
The wind blowing against the roof will be forced up and over the roof
resulting in a low pressure zone on the back side of the roof. This
low pressure zone will draw the air up and out of the ridge vent even
more effectively than the wind turbine. So the result is that ridge
vents are not totally dependent on convection currents.

There are at least two exceptions.

1. If the wind is blowing parallel to the ridge vent, no suction.

2. If the wind is blowing perpendicular to the ridge vent, as much (or more)
is blown INTO the ridge vent as is sucked out.

All in all, I suspect it's a push regarding wind and ridge vents.

texan1 had written this in response to
http://www.thestuccocompany.com/main...es-368660-.htm
:
Thank you all for the pointers here. I think that I will go with wind
turbines for the part of the attic that has really steep roof and will do
a ridge went for the the game room add-on where there is almost no space
between sheet rock
and the decking. It seems that pretty much every roofer that I talked to
is
proposing this solution. Their take was that either ridge vent or turbines
will as good of a job but ridge vent had a better chances of being torn up
in a storm.

tx1
-------------------------------------
olddog wrote:

"texan1" wrote in
message
m...
Seems like we need to replace a roof after most recent storm in
our
(Dallas,TX) area.I'm thinking about putting impact resisting
shingles and
since it requires
more ventilation I can't decide if I should put additional wind
turbines
or have a solar fan installed instead. Our electric bill is not
that high
during the summer so I'm not sure if there is any benefit of
having a
solar vent + we have plenty of wind to keep turbines rolling.

Any advice will be appreciated.



I looked at solar powered vents too but I came to the conclusion they
would
have to be replaced periodically. I bought wind turbines and then we
got hit
by that hail storm in Austin. I had some roofers come out and one said
he'd
install a ridge vent for free, with a new roof of course. (Lon Smith
Roofing, They are in Dallas too) I took that est. and called a local
roofer
and he said he could match it. So I took the turbines back to
Homedepot.

Problem with turbines is you have to put in so many. I have a small
1700 sq
ft house and the roofer told me I'd need 6 turbines.

Efficiency wise the ridge vent is supposed to be the best current
technology
and can be installed for about $450 to $800 for a 36 ft ridge on a
single
story. These are est. I got from two different roofers.

Let us know what you end up with.

od






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On Apr 17, 2:27*pm, "HeyBub" wrote:
BobR wrote:

-



The same mechanism also works with the ridge vents if there is wind.
The wind blowing against the roof will be forced up and over the roof
resulting in a low pressure zone on the back side of the roof. *This
low pressure zone will draw the air up and out of the ridge vent even
more effectively than the wind turbine. *So the result is that ridge
vents are not totally dependent on convection currents.

There are at least two exceptions.

1. If the wind is blowing parallel to the ridge vent, no suction.

2. If the wind is blowing perpendicular to the ridge vent, as much (or more)
is blown INTO the ridge vent as is sucked out.

All in all, I suspect it's a push regarding wind and ridge vents.

Do some research on the subject and you will see that is not the
case. Its a rare case the the wind will be blowing directly parallel
to the ridge but even if it is, it will reach some point of leaving
the roof and will thus draw a low pressure. As for the perpendicular
blowing as much in as is pulled out, that is not even close to the
case. The low pressure on the back side will far exceed any air blown
in and the air blown in will be directed directly out the other side
increasing the pull on the air in the attic.

A machinist friend of mine once got a contract for producing a vacuum
pump that used compressed air. It operated on what I believe they
term the venturi effect. The compressed air was released at a point
where it pulled additional air from the vacuum feed line. The
resulting low pressure zone would pull a complete vacuum on a 55
gallon drum in a matter of seconds. It was amazing to see how
effective it was.

SteveBell wrote:
RicodJour wrote:
On Apr 17, 10:05 am, "SteveBell" wrote:
SteveBell wrote:
Seems like we need to replace a roof after most recent
storm in our (Dallas,TX) area.I'm thinking about putting
impact resisting shingles and since it requires
more ventilation I can't decide if I should put additional
wind turbines or have a solar fan installed instead. Our
electric bill is not that high during the summer so I'm not
sure if there is any benefit of having a solar vent + we
have plenty of wind to keep turbines rolling.
The first time you install a wind turbine, you'll discover
that the rotation doesn't actually do anything, except maybe
keep rain out. The turbine isn't fastened to a fan of any
kind, so the square inches of pipe is the only thing you need
to consider. You need to have roughly the same number of
square inches of exit for hot air at the top of the roof as
you have inlet for cool air under the eaves.
This assertion can be debunked quite easily.
Simply stand under the turbine with a stick of incense and
watch the smoke. Then stop the turbine and watch the smoke
again. In the former case, the smoke is sucked out quite
rapidly; in the latter case, the smoke goes nowhere.
A ridge vent - or hole in the roof - depends on a temperature
difference between the air in the attic and that outside to
generate convection currents.
A 12" wind turbine will move about 350 CFM of air in a 5MPH
wind, irrespective of the temperature differential.
With no wind, the turbine acts like a ridge vent, dependent
entirely on convection currents.
So what's the mechanism? How does the spinning top pull air out?
Analogous to a flywheel and utilizes the Venturi effect.
More info:
http://www.realvents.com/

I saw that page in my searching, but it just crows about how it's
"better", not explaining the physics.

Still searching since this is interesting.
I looked also. If you find a good site please post.

Lou

Smitty Two wrote:
In article ,
"HeyBub" wrote:

Simply stand under the turbine with a stick of incense

You misspelled "lit cigarette," cowboy. We'll let it go this time, but
jeez, be careful with the man image, there.

My bad.

I smoke like a chimney, but I thank Obama for raising the taxes on 60
million Americans, virtually all making less than $240,000. It inspired me
to import my cigarettes from India (real "Indian" smokes) at about 50¢ a
pack. Rumor has it I can get them from North Korea even cheaper.

On Apr 18, 8:38*am, "HeyBub" wrote:

I smoke like a chimney, but I thank Obama for raising the taxes on 60
million Americans, virtually all making less than $240,000. It inspired me
to import my cigarettes from India (real "Indian" smokes) at about 50¢ a
pack. Rumor has it I can get them from North Korea even cheaper.

Yep, I hear the SE Asian pesticides are much more flavorful. If it
tastes a bit sweet, it's probably the lead.

R

On Apr 16, 11:20*am, (texan1) wrote:
Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles and
since it requires
more ventilation I can't decide if I should put additional wind turbines
or have a solar fan installed instead. Our electric bill is not that high
during the summer so I'm not sure if there is any benefit of having a
solar vent + we have plenty of wind to keep turbines rolling.

Whatever you do decide to do, pay attention to total venting area.
If you don't have at least one square foot vent opening per 300 square
feet of vented space, your shingle warranty is likely to be void. But
I
suggest twice that, 1 foot per 150 square ft of vented space.
Owens-Corning says square footage, with no regard to how it's done.
And do the math. Area is pi times radius squared. A 12" turbine has
a radius of 6". Squared it's 36. So the square footage for that vent
is
barely 110", certainly less than a square foot for each turbine.

Make sure you've got good soffit venting, too.

On Apr 16, 11:20*am, (texan1) wrote:
Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting shingles and
since it requires
more ventilation I can't decide if I should put additional wind turbines
or have a solar fan installed instead. Our electric bill is not that high
during the summer so I'm not sure if there is any benefit of having a
solar vent + we have plenty of wind to keep turbines rolling.

Any advice will be appreciated.

-------------------------------------

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I maintain some solar powered equipment but I have to monthly clean
the array or the batteries get where they will not stay charged. I
definitely would not want to have to keep going up on the roof to
clean them. Besides that that much walking on your roof isnt good for
it. Why not an AC powered vent fan?

Jimmie

Michael B wrote in news:7b0d98b0-530c-4686-a089-
:

Make sure you've got good soffit venting, too.

What to do when there are no soffits to speak of?

--
Best regards
Han
email address is invalid

HeyBub wrote:
Smitty Two wrote:
In article ,
"HeyBub" wrote:

Simply stand under the turbine with a stick of incense
You misspelled "lit cigarette," cowboy. We'll let it go this time, but
jeez, be careful with the man image, there.

My bad.

I smoke like a chimney, but I thank Obama for raising the taxes on 60
million Americans, virtually all making less than $240,000. It inspired me
to import my cigarettes from India (real "Indian" smokes) at about 50¢ a
pack. Rumor has it I can get them from North Korea even cheaper.


As bad as Reds are for you, you have to wonder what kind of fillers etc.
are used in smokes from countries that are not so tightly regulated and
litigious as the US.

nate

--
replace "roosters" with "cox" to reply.
http://members.cox.net/njnagel

Nate Nagel wrote:
HeyBub wrote:
Smitty Two wrote:
In article ,
"HeyBub" wrote:

Simply stand under the turbine with a stick of incense
You misspelled "lit cigarette," cowboy. We'll let it go this time,
but jeez, be careful with the man image, there.

My bad.

I smoke like a chimney, but I thank Obama for raising the taxes on 60
million Americans, virtually all making less than $240,000. It
inspired me to import my cigarettes from India (real "Indian"
smokes) at about 50¢ a pack. Rumor has it I can get them from North
Korea even cheaper.

As bad as Reds are for you, you have to wonder what kind of fillers
etc. are used in smokes from countries that are not so tightly
regulated and litigious as the US.


Are you picky about your poisons?

BobR wrote:

A machinist friend of mine once got a contract for producing a vacuum
pump that used compressed air. It operated on what I believe they
term the venturi effect. The compressed air was released at a point
where it pulled additional air from the vacuum feed line. The
resulting low pressure zone would pull a complete vacuum on a 55
gallon drum in a matter of seconds. It was amazing to see how
effective it was.

Did the drum immediately collapse?

In article ,
"Bob F" wrote:

Nate Nagel wrote:
HeyBub wrote:
Smitty Two wrote:
In article ,
"HeyBub" wrote:

Simply stand under the turbine with a stick of incense
You misspelled "lit cigarette," cowboy. We'll let it go this time,
but jeez, be careful with the man image, there.

My bad.

I smoke like a chimney, but I thank Obama for raising the taxes on 60
million Americans, virtually all making less than $240,000. It
inspired me to import my cigarettes from India (real "Indian"
smokes) at about 50¢ a pack. Rumor has it I can get them from North
Korea even cheaper.

As bad as Reds are for you, you have to wonder what kind of fillers
etc. are used in smokes from countries that are not so tightly
regulated and litigious as the US.


Are you picky about your poisons?

It'd be un-American to die from smoking foreign cigarettes.

On Apr 18, 11:36�am, Nate Nagel wrote:
HeyBub wrote:
Smitty Two wrote:
In article ,
"HeyBub" wrote:

Simply stand under the turbine with a stick of incense
You misspelled "lit cigarette," cowboy. We'll let it go this time, but
jeez, be careful with the man image, there.

My bad.

I smoke like a chimney, but I thank Obama for raising the taxes on 60
million Americans, virtually all making less than $240,000. It inspired me
to import my cigarettes from India (real "Indian" smokes) at about 50� a
pack. Rumor has it I can get them from North Korea even cheaper.

As bad as Reds are for you, you have to wonder what kind of fillers etc.
are used in smokes from countries that are not so tightly regulated and
litigious as the US.

nate

--
replace "roosters" with "cox" to reply.http://members.cox.net/njnagel- Hide quoted text -

- Show quoted text -

anyone who smokes doesnt care about their health.

tobacco should pay for all adverse health effects.

"bob haller" wrote in message
...
On Apr 18, 11:36?am, Nate Nagel wrote:
HeyBub wrote:
Smitty Two wrote:
In article ,
"HeyBub" wrote:

Simply stand under the turbine with a stick of incense
You misspelled "lit cigarette," cowboy. We'll let it go this time, but
jeez, be careful with the man image, there.

My bad.

I smoke like a chimney, but I thank Obama for raising the taxes on 60
million Americans, virtually all making less than $240,000. It inspired
me
to import my cigarettes from India (real "Indian" smokes) at about 50? a
pack. Rumor has it I can get them from North Korea even cheaper.

As bad as Reds are for you, you have to wonder what kind of fillers etc.
are used in smokes from countries that are not so tightly regulated and
litigious as the US.

nate

--
replace "roosters" with "cox" to reply.http://members.cox.net/njnagel-
Hide quoted text -

- Show quoted text -

anyone who smokes doesnt care about their health.

tobacco should pay for all adverse health effects.

+++++++++++++++++++++++++++++++++

same could be said about people who drink or eat at McDonalds.

where would it end?

od

bob haller wrote:

anyone who smokes doesnt care about their health.

tobacco should pay for all adverse health effects.

We do. A recent study found that the health costs for smokers is far, FAR
outweighed by the money the government saves in Social Security benefits due
to earlier deaths.

If the government had any sense, the best plan to "save" social security
they could promote is one that encourages smoking.

But, of course, that would disrupt the mass movement against smoking and
what would those poor mindless people do? We've saved the whales, eliminated
nuclear power, burnt the bras, and elected a progressive.

Banning smoking is the only mass movement left that gives meaning to many
folks otherwise meaningless lives. You see, people mind their own business
when it is worth minding. When it's not, they take their mind off their own
irrelevant affairs by minding other peoples' business. That, in essence, is
the purpose of the anti-smoking campaign.

Han wrote:
Michael B wrote in
news:7b0d98b0-530c-4686-a089-
:

Make sure you've got good soffit venting, too.

What to do when there are no soffits to speak of?

Then the air will be sucked out of the living space: Cracks, gaps around
light fixtures, holes containing pipes and vents. With that goes your
conditioned air.

Michael B wrote:
On Apr 16, 11:20 am, (texan1) wrote:
Seems like we need to replace a roof after most recent storm in our
(Dallas,TX) area.I'm thinking about putting impact resisting
shingles and since it requires
more ventilation I can't decide if I should put additional wind
turbines or have a solar fan installed instead. Our electric bill is
not that high during the summer so I'm not sure if there is any
benefit of having a solar vent + we have plenty of wind to keep
turbines rolling.

Whatever you do decide to do, pay attention to total venting area.
If you don't have at least one square foot vent opening per 300 square
feet of vented space, your shingle warranty is likely to be void. But
I
suggest twice that, 1 foot per 150 square ft of vented space.
Owens-Corning says square footage, with no regard to how it's done.
And do the math. Area is pi times radius squared. A 12" turbine has
a radius of 6". Squared it's 36. So the square footage for that vent
is
barely 110", certainly less than a square foot for each turbine.

Make sure you've got good soffit venting, too.

Right. The one foot should be equally divided between intake and exhaust.
That is, for a 3000' home, you need 100 sq ft of ventilation space: 50 sq ft
of exhaust and 50 sq ft of soffit vents.

As a corollary, you can't have too many soffit vents.

In article , says...
I maintain some solar powered equipment but I have to monthly clean
the array or the batteries get where they will not stay charged. I
definitely would not want to have to keep going up on the roof to
clean them. Besides that that much walking on your roof isnt good for
it. Why not an AC powered vent fan?

Reason #1:
Round here, the general consensus is that they *use* more energy than they save. At best, it's a rough break-even.

Reason #2:
A couple of years after I bought my first house, I woke up about 2:00 a.m. After I talked to John, I noticed a very low hum. I figured my refrigerator motor or something was about to die, so I roamed around listening. I never found the problem, so I went back to bed.

A few months later, the same thing happened again. This time I noticed that the hum lasted 90 seconds, then stopped to two minutes. It was very regular. But I *still* couldn't track it down. Oh well, something will quit working soon, then I'll know what it is.

A bunch more months went by, winter came and went, and the hum got loud enough to hear during the day. I finally tracked it down the the powered attic vent. The motor had seized. It came on until it overheated, the emergency shutoff did its job, the motor cooled down, and the cycle started again.

I replaced the fan--my first ever real home maintenance job--and wondered how close I came to burning the house down.

--
Steve Bell
New Life Home Improvement
Arlington, TX

HeyBub wrote:
bob haller wrote:

anyone who smokes doesnt care about their health.

tobacco should pay for all adverse health effects.

We do. A recent study found that the health costs for smokers is far,
FAR outweighed by the money the government saves in Social Security
benefits due to earlier deaths.

If the government had any sense, the best plan to "save" social
security they could promote is one that encourages smoking.

But, of course, that would disrupt the mass movement against smoking
and what would those poor mindless people do? We've saved the whales,
eliminated nuclear power, burnt the bras, and elected a progressive.

Banning smoking is the only mass movement left that gives meaning to
many folks otherwise meaningless lives. You see, people mind their
own business when it is worth minding. When it's not, they take their
mind off their own irrelevant affairs by minding other peoples'
business. That, in essence, is the purpose of the anti-smoking
campaign.

Don't start me. On this, the Right Side of The Pond, we've now got folk
employed by the local community to watch for folk who might stub out a
cigarette on the sidewalk or dispose of one through the window from their
car ( which would be highly irresponsible if there was an opportunity for a
fire to be caused). Rarely the case in the UK. We are blessed with frequent
and abundant rainfall mostly.A taxi driver was recently done for smoking in
her car whilst she could not work and was using the vehicle for private use.
We have so many government agencies stuffed full of idiots that could not be
otherwise employed that it is wonder that anyone wants to create wealth.

What a rotten fellow you are winding me up!

Clot wrote:

Don't start me. On this, the Right Side of The Pond, we've now got
folk employed by the local community to watch for folk who might stub
out a cigarette on the sidewalk or dispose of one through the window
from their car ( which would be highly irresponsible if there was an
opportunity for a fire to be caused). Rarely the case in the UK. We
are blessed with frequent and abundant rainfall mostly.A taxi driver
was recently done for smoking in her car whilst she could not work
and was using the vehicle for private use. We have so many government
agencies stuffed full of idiots that could not be otherwise employed
that it is wonder that anyone wants to create wealth.
What a rotten fellow you are winding me up!

You'll love this (from another group)

THESE UK MEN NEED SUPERVISION!

* Sir Ranulph Fiennes, the first man to walk across Anartica and holder of
medals for polar expeditions,

* Sir Robin Knox-Johnston was the first man to sail singlehanded and
non-stop around the globe, and in 1994 won the Jules Verne Trophy for the
fastest circumnavigation of the world by yacht.

* John Simpson has been shelled in Afghanistan, bombed with poison gas in
the Iran-Iraq war and dodged bullets in Tiananmen Square.

The BBC required the men to take classes on how to light and operate a
propane stove.

http://www.dailymail.co.uk/news/arti...-accident.html

On Apr 18, 7:38*am, "HeyBub" wrote:
Smitty Two wrote:
In article ,
"HeyBub" wrote:

Simply stand under the turbine with a stick of incense

You misspelled "lit cigarette," cowboy. We'll let it go this time, but
jeez, be careful with the man image, there.

My bad.

I smoke like a chimney, but I thank Obama for raising the taxes on 60
million Americans, virtually all making less than $240,000. It inspired me
to import my cigarettes from India (real "Indian" smokes) at about 50¢ a
pack. Rumor has it I can get them from North Korea even cheaper.

Obama didn't raise those taxes. He couldn't have since he promised he
wouldn't raise taxes in any form that would apply to people making
less than 200,000 per years. So you must be wrong about Obama raising
those taxes.

On Apr 18, 6:46*pm, "olddog" wrote:
"bob haller" wrote in message

...
On Apr 18, 11:36?am, Nate Nagel wrote:





HeyBub wrote:
Smitty Two wrote:
In article ,
"HeyBub" wrote:

Simply stand under the turbine with a stick of incense
You misspelled "lit cigarette," cowboy. We'll let it go this time, but
jeez, be careful with the man image, there.

My bad.

I smoke like a chimney, but I thank Obama for raising the taxes on 60
million Americans, virtually all making less than $240,000. It inspired
me
to import my cigarettes from India (real "Indian" smokes) at about 50? a
pack. Rumor has it I can get them from North Korea even cheaper.

As bad as Reds are for you, you have to wonder what kind of fillers etc..
are used in smokes from countries that are not so tightly regulated and
litigious as the US.

nate

--
replace "roosters" with "cox" to reply.http://members.cox.net/njnagel-
Hide quoted text -

- Show quoted text -

anyone who smokes doesnt care about their health.

tobacco should pay for all adverse health effects.

+++++++++++++++++++++++++++++++++

same could be said about people who drink or eat at McDonalds.

where would it end?

od- Hide quoted text -

- Show quoted text -

Maybe it would end with people taking better care of their health and
it might just save a few billion dollars in the process not to mention
something on the order of 100,000 lives per year.