REGISTER | LOGIN
Home    Bloggers    Blogs    Article Archives    Messages    About Us   
Tw  |  Fb  |  In  |  Rss
John Dunn

High Voltage! Don't Try This at Home!

John Dunn
Page 1 / 2   >   >>
Brad Albing
Brad Albing
3/24/2013 6:51:42 PM
User Rank
Blogger
Re: other ways to get Hi-V
I know Jim Williams had mentioned piezo transformers some time ago in one of his app-notes (10 yeas ago? 15?).

50%
50%
Brad Albing
Brad Albing
3/24/2013 6:50:07 PM
User Rank
Blogger
Re: other ways to get Hi-V
Well, looks like it's calling out for another blog by me on the topic.

50%
50%
Brad Albing
Brad Albing
3/24/2013 6:49:25 PM
User Rank
Blogger
Re: Why Does 40KV reduce gas consumption?
I've not heard of this process befoe this blog. Wonder if it's still used by anyone or if there is any research available....

50%
50%
John Dunn
John Dunn
3/24/2013 12:33:48 AM
User Rank
Blogger
Re: other ways to get Hi-V
Nope. I've never had any involvement with piezo devices of any kind.

50%
50%
Brad Albing
Brad Albing
3/23/2013 11:11:01 PM
User Rank
Blogger
other ways to get Hi-V
Hi John - on the topic of high voltage generation, have you ever used a piezo device to gen hi-V? Either the type you wack or a piezo-transformer?

50%
50%
eafpres1
eafpres1
3/22/2013 4:37:26 PM
User Rank
Blogger
Re: Why Does 40KV reduce gas consumption?
My guess is that the energy savings must have something to do with water vapor/humidity.  I can't imagine how a potential would affect the amount of water conveted to vapor during the baking process, but I can imagine that decreasing the humidity would affect the baking time.  I found and interesting reference that indicated the thermal conductivity of moist air actually decreases with moisture content:

Tc vs humidity of moist air

So one theory would be the high voltage somehow de-humidifies the air, creating a better transfer of energy into the bread.

Another thought is that tiny droplets of water might form in a cloud around the bread during baking, and the high voltage might cause them to migrate somehow, possibly removing water from the bread dough without net evaporation and consequent high waste of energy.  Since the field was AC, I'm not sure how this could occur.

Another effect of signifcant de-humidification would be to reduce absorption of infra-red energy by water droplets, which would increase the radiative heat transfer.  I think it possible that both conduction and radiation could be involved in baking bread.

50%
50%
WKetel
WKetel
3/21/2013 4:56:37 PM
User Rank
Artist
Re: Why Does 40KV reduce gas consumption?
The benefit gained from the 40 Kv source may have altered the convection patterns and thus improved the heat transfer. Perhaps it altered then formation of the stagnation zones in the convection airflow.

As for producing the high voltage, that description sounds a l9t like the old oscillator hich voltage system, with the single 1B3 diode. But if it is arranged a bit differently then there is a 20kV ripple on top of the 20kV dc, hence 40,000 volts.

Presently I am looking for a similar transistorized system to provide about 10Kv for a vehicle protection device. 

50%
50%
Qzz
Qzz
3/21/2013 1:08:12 PM
User Rank
Newbie
Re: Why Does 40KV reduce gas consumption?
I might try it......As I always say "One experiment is worth a 1000 expert opinions"

 

50%
50%
John Dunn
John Dunn
3/21/2013 1:02:37 PM
User Rank
Blogger
Re: Why Does 40KV reduce gas consumption?
The bakery never offered an explanation, only their observation and who it was who had first come up with the idea was somethng lost in the shrouds of time. My guess is that the bread dough must have been getting corona discharge effects on a grand scale which accelerated ingredients' breakdowns that the oven heat was going to do anyway, that the corona just made it happen faster.

50%
50%
Qzz
Qzz
3/21/2013 12:52:44 PM
User Rank
Newbie
Why Does 40KV reduce gas consumption?
Why Does 40KV reduce gas consumption when baking bread?

(Is this like wearing magnetics for aches and pains?:-) ) It must work ...but why?

(I used to build boiler controls)

50%
50%
Page 1 / 2   >   >>
latest blogs
These days, I often code design equations for filter circuits directly into sequences of Excel cells
The introduction of the solar boat is necessary to preserve our planet, which is mainly covered by water; the autonomous drive option is a pleasant alternative
Leading up to APEC have been a slew of new introductions by various suppliers. I wanted to highlight some of that here on Planet Analog for your information
Could a 16-bit SAR converter application reach a dynamic range of 125 dB at 600 kSPS?
My ‘gut feel’ as an Electronics Engineer tells me that the need for more adequate and intensive pilot training is a strong possibility
flash poll
educational resources
 
follow Planet Analog on Twitter
Planet Analog Twitter Feed
like us on facebook
our partners
Planet Analog
About Us     Contact Us     Help     Register     Twitter     Facebook     RSS