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I have a couple of applications for Peltier effect devices.

Iron

Have used piezelectric device to determine pump position in stroke on rod pumps.

 

Iron

hello all from Edmonton, Alberta.

Iron

once again, thanks sir paul for the lesson you've shared to us, only i can say is that, EXCELLENT and much appreciated for the lecture, very informative and clearly understood...

i am about to sign-off, it's midnight here and i have office tomorrow, so, continue for this lesson will be by tomorrow night...

goodnight & happy good day to all!

i am now on slide 13 of the topic...

i am now to begin with slide 2...

i am now downloading the slides for this lecture with sir paul as well as for my reference...thanks & good evening!

once again, here i am again catching-up the lesson for this course day-3...

thank you for the recorded section

Iron

Re. piezo use... not for energy harvesting so far...

Iron

Great to have access to the recorded sessions!

Iron

Missed the live lecture...

Iron

Taking the class offline...

Iron

No experience with fluid TEG devices

No current thermal energy generation project

No current work on piezo devices

Catching up before todays session

Iron

This was very valuable information.  Great time management to get the material in within the 1/2 hour target.

Thanks for having the archive available for those of us double booked when this was presented.

Iron

Thanks Paul, another interesting session

Iron

good day to all:) God Bless the USA

Iron

thank you Paul a lot of the good info. good points ideas, thank you

Iron

Thank you everyone for listening today,

I hope this lecture was useful to you.  See

you tomorrow.  Bye.

Blogger

Thermionic I have always thought to mean the emission

of electronics from a white-hot source.  Its the primary

electron charge carriers in vacuum tubes. 

Blogger

Good Introduction here, I suppose Anne R will now have to set up a series of articles in Design News for the subject(s) ... it deserves more research  ... will spend a little time this week doing more ...

God Bless Boston...

Iron

Thanks for the overview Paul

 

Iron

thank you a good info...

Iron

a bit different from TEG, there is something called "thermionic" which does not rely on thermal difference, i believe, although it needs higher temperature.  i belive that Thomas Edison observed this thermionic effect.  is it used anywhere, Paul?

Iron

Thank you Paul very informative

Iron

Great presentation. I learned a lot.

 

Real-life examples for the large delta-T is in boiler

and facilities maintenance plants.  In boilers there's

lots of thermal waste in hot-pipe energy.  This makes

ideal energy sources for untethered temperature sensing.

 

Blogger

Ohk thatnk you. got it now.   So best scenario is to mount the TEG on the side of a heat source, avoid if we can the top side of the heat source and NEVER mount it on the bottom of the heatsource. 

 

Regarding slide 15, note that deltaT simply drives the heat flux, and is much easier to measure.  The heat flux is used in the energy conversion, that's why Rteg (thermal) should match Rsink (thermal).  If you maximize Rteg, you minimize heat flux.

Iron

Piezo devices:  Low frequencies may indeed generate higher

power.  Voltage is dependant upon the time-rate-of-change of

a single deflection.  If the device has a heavy load, then that

change will happen rapidly and be large - potentially generating

a voltage spike.  If the vibration-energy is period, then so will be

the output.  If an impulse is applied to the device - that will show

up as an impulse energy on the output.

Blogger

@AlaskaMan and rruther - thanks for the 'great white north' application info -- perhaps in Alaska you can find heating applications that you can use to get the large temperature gradients needed for TEG

I understand TEG's aren't very efficient. What sort of max efficiency is obtainable?

yes, big Delta T's required ... want to see some real life application examples of where / how to achieve those large Delta T's

Maybe slide 23 is not so well drawn.  The heat source is the copper-colored

side, the blue side is the cold side, each picture stands on its own in the slide

This was a confusing way to present it..... but the point is - don't orient your

TEG is such a manner as to push heat back into the cold side.

 

 

Blogger

Paul thnaks for the presentation. 

Iron

So per page 21 the part requires a difference of 50degrees C from one side to the other to output 9mW?

Iron

Some people asked about temperature differences and TEG

operation.  Once again:  If there is no difference in TEMPERATURE

from the hot to cool side of the TEG, then it won't work.

Blogger

Paul, I'm unclear about the way piezo devices perform. Is the voltage produced a function of the strain only, and independent of the rate? Also, in slides 9 and 10, the power curves show lower frequencies generating higher power. That seems backwards.

Hi Paul, Thanks you for all this.

Perhaps I did not understand, or missed something.  On slide 23. If heat sourse is on bottom, and we want to keep the cool side cool, shouldn't "Acceptpable orientation" really be the idea?    Why does the pink and purple side have to both face the heat source?

 

Good show again Paul

Iron

Regards the short circuit current question:

I believe we left 'x' out implying that for constant 'X'

area is the controlling factor for current.

Blogger

I've learned that some TEG series are better for power generation than 'regular' cooling TEG devices.  Those meant for power generation are sealed to keep condensation out and have a max differential temperature.  This may be worth bringing up so people don't take the first TEG they find and hope to have good results.

Iron

Material fatigue question:  I don't know if there is or not.

Certainly if the deflection is very high there must be, but

in general we should not be requiring that.

 

Blogger

good presentation, looking forward to next classes ... would like to see some (more) real world application examples

@78RPM  Yes, 100 Kelvin deltaT 

Iron

Yes, 100K is 100degrees (K or C same scale) difference

in temperature from hot to cool side.

Blogger

On slide 21, does 100K mean 100 degrees Kelvin as a temperature difference?

Gold

Thanks Paul, I'm enjoying this series - well summarized and to the point!

Iron

Thank you for today's presentation Paul

 

Iron

Another great one. Thanks, Paul!!

Iron

Are the slides from the other lectures avalible?

Excellent, Paul! Thanks so much.

 

Iron

Thank you. Was very interedted.

Iron

No experience, but certainly can be used on a SPA.

Iron

Hello, very late today.

Iron

as an example --- auto exhaust pipe connected to one side, other side connected to auto frame??

Have not used fluid driven but this is the application I am working on. Recovering some losses in the system.

Iron

No experience but working fluids readily available.

Iron

Today's next audience question is
Does anyone in the listen audience have experience with fluid-driven TEG devices?

Blogger

pretty large delta T's tho isn't it??

There are some other TEG forms, check out the second half of this informal youtube video (high heat but power output is considerable!) :   https://www.youtube.com/watch?v=gNND2pxvxgU

Iron

Will it work at -20 degree Celsius up north?

Iron

Yes, I've seen it.  Here is another great use of TEGs, http://www.biolitestove.com/  It makes 5V available for USB charging via rocket camp stove.

Iron

Today's next audience question is
Who in the listening audience has seen this clever contraption?

Blogger

Sold at woodway in Fairbanks, AK.

Iron

How is influencing the ambiant temperature the generation of electricity of a TEG if the temperature difference is the same? Say the set-up is at 20 degrees Celsius or 0 degree Celsius.

Iron

TEG will be useful up north windy

Iron

TEG is appealing with steam lines

Iron

"potential difference" always needed

Love to learn more about TEGs.  I've learned that some TEG's are better for power generation than other TEG devices.

Iron

not at this time yet,...

Iron

I've been intrigued by TEG

 

I am not considering TEG

 

Iron

Not considering, buy interedted in.

Iron

Isn't X missing ...

Isc:  Short Circuit Current proportional to L x W x X(?)

Iron

@ RFoznot,  yes  Special educational materials  below it download slides.

up top there should be a n audio bar.  click on it to start.   log in

 

do not use piezo for now.

Iron

@RFoznot, click on the audio bar under the banner and click on Today's Slide Deck to download the PowerPoint slides

Gold

No TEG of mbut some Pizo.

 

Iron

Is there material fatigue in such a device on slide 8?

Gold

Hello everyone .... are we supposed to see any slides or hear any sound?

Iron

not yet sound like a good option.

Iron

Have used TEG for prototype but never made it to field testing

Iron

TEG, Desert Thermal to heat water to steam too drive generators

 

Iron

Trans Alaska Pipeline uses a propane powered TEG to charge the battery banks that control pipeline check valves

not currently using piezo or TEG.

Iron

I use pizo as sensors but not to harvest energy

Iron

No piezo or TEG in any of my designs.  But a friend has a fan similar to the one on slide 17, on top of his wood stove :).

Iron

We do not currently use TEG but I am interested in this area to help recover some system losses in our systems

 

Iron

No, but could be useful for our sensors.

Iron

Solar thermal is a lot more efficient than photovoltaics.

Today's first audience question is
Does anyone listening already make use of Piezo or TEG devices in an existing application?

Blogger

Hello Paul. Sunny in GA

Iron

Hello from Milwaukee! Audio is up.

Iron

Hi all - The audio is live!

Hello from Longmont, CO

Iron

small hydro are plagued with debris and icing.

Iron

We hibernate, but don't tell anyone :)

Not sure about 24-hour days, either...

Iron

The stirling engine idea would still have to have *some* sun, so probably wouldn't go in the winter. 

Of course, extracting energy from the cold is....well, one of those ideas.  Wind, hydro more plausible, probably.

Iron

GVEA has major wind power online in Eva Creek

Iron

Oy vey....don't know if I could handle 24-hr nights!

 

Iron

I believe the State's fish counters are also powered with photovoltaics and zinc air batteries.

But the real killer app would be micro in river hydro generators

hello from Ottawa, ON, for the third time this week.

Iron

now 15hrs 22 mins daylight soon +22hrs daylight. Winter, near xmas, the sun may never make it over the horizon for weeks with 22 hours of sunset and near darkness all day, plus overcast conditions.

Iron

Hello from sunny Montana

Gold

Dept of Transportation has photovoltaic weather stations in Thompson Pass just north of us.

Actually, a stirling engine with a solar (thermal) hot section and the cold sink in the snow would work. Only problem is they're way too expensive.

@rruther2, pretty critical app there in RR Xings.  Probably not a lot of conflicting traffic tho relative to some major lines.  Still, an interesting data point on apparent reliability ...

How many hours of daily sunshine in those winter months?  Cold batteries sometimes hard to deal with also ... very interesting!

@Alaskaman et al. -- too bad you can't harvest energy from the cold!

Iron

The Alaska Railroad from Fairbanks to Anchorage uses photocells & batteries to control rail crossings. They probably need a boost from a vehicle during the sub-arctic winter months. No commercial power for most of one hundred miles with spotless performance.

Iron

Good afternoon, all.

 

Mark: If you you feel you're still in the grip of winter, you should see my front yard. Six feet of snow. I think we're going to have a white Mother's Day this year.

Alaskaman, what is energy harvesting to you; oil pipeline, solar, wave, wind power - other??

 @Ann R. Thryft:

From a Cultural Anthropologists' viewpoint, what is your opinion on Energy Harvesting in particular, but perhaps more broadly, energy (and resource) utilization in general (OK, OK, the topic of a thesis I suppose) :)

Good Morning All from Beautiful Valdez

Hello from Binghamton, NY

Iron

Slides are good to go here. Using Powerpoint and Firefoox browser

Iron

Good Afternoon from Sunny Boston; 24 Slides Check !

Iron

from Greenbelt, MD..hello

 

looks like LinkedIn is supposed to be our 'facebook' as some of the presenters say ... better get on board there ... gotta get out more ...

Be sure to follow @designnews and @DigiKeyCEC on Twitter for the latest class information. We encourage you to tweet about today's class using the hashtag #CEC.

Blogger

Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY

Blogger

The streaming audio player will appear on this web page when the show starts at 2pm eastern today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser.

Blogger

Greetings from Minnesota - still aparantly locked inthe dead of winter.

 

Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Blogger

@Digital Angel: Thanks for the link

Iron

Good morning from Nebraska!

Iron

Good morning from SoCal!

Iron

Good morning from a chilly, stormy Chicago!

Iron

Howdy folks!!!   :)   (Lovely morning in the Ozark Hills!!)

Good morning from Scottsdale, AZ

Iron

Yesterday the LTC3105 (day 2, slide 10) was introduced.

TI seems to have a comparable part, the BQ25504.  The DigiKey website says:

 

Texas Instruments' bq25504 is the first of a new family of intelligent integrated energy harvesting nano-power management solutions that are well suited for meeting the special needs of ultra-low power applications. The product is specifically designed to efficiently acquire and manage the µW to mW of power generated from a variety of DC sources such as photovoltaic or thermal electric generators.

http://www.digikey.com/product-highlights/us/en/texas-instruments-bq25504-converter/1082


Looks like an interesting part -- Comments solicited. 

Data sheets and an evaluation module are available from DigiKey:

http://www.digikey.com/product-detail/en/BQ25504EVM-674/296-29834-ND/2773145?cur=USD

Don't you hate it when other people want to hold meetings during our learning time?

I'm back today and energized!

Iron

Good morning from Brick, NJ

Iron

Good moring, looking forward to today's class. Looking at the slides there are some interesting parts that can have very practical applications. Gets my creative ideas moving :)

Iron

Greetings from Raleigh, NC

Iron

Hi from Panama City FL

Iron

Good morning from Edmonton, AB

Iron

Good morning from Portland Oregon

Iron

Good Morning, everyone

Iron

Good morning from Mobile, AL

I am looking forward to this class

Iron


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