It's been forever:)

The mosquito catching screen covered fan idea you had talked about a long time ago has worked great around our house for years now.

So very happy to see you again Dan! My projects are now coming up to your level of expertise, thanks for all.

Glad to see you making videos again Dan. Hope you and Denise are doing ok...

I used to watch you as a kid… crazy how time flies.

Glad to see you back in action Dan. I hope to see more.

So good to see you posted again Dan, I’ve missed your innovations.

For a non ageing couple working together, being with one another for so long a time, inspiring many all over the Earth, with your diverse practical scientific experiments and explanations, worth more than many degree holders put together.

Yes, a new video! Great idea Dan, thanks for posting this and much appreciated.

Ahhhhhh!!!! Finally! Man we missed you guys! Just picked up one of your 29" parabolic mirrors for emergency cooking. Will also be looking into your fernel lense, can't wait to get one of those too.

Those protective goggles look awesome and I would def want those when messing with directed UV rays.

I'll always tune in thanks for all the years of inspiration

Good to see you're still at it you should start your fresnel lens series all over again. It is sooooooo satisfying watching your old vids.

Great idea for fast water heating. i'm going to try this!

Perhaps you'd want to insulate the back of the coil, since it's not absorbing much sunlight, and just dissipates heat to the surrounding air?

dan you are a legend in my office in the uk there are over 243 people who watch your videos in our department

Good to see you again Dan! Hey from Lutz, Fl😁

Do you think a soot coating would work to capture the heat? I think (?) it would be less toxic than paint if you ever wanted to use the coil for making beer (or, uh, hand sanitizer) again.

Dan, it looks to me like you just made post-apocalyptic Survival a thing of ease, with this. Not only can you heat water for bathing, etc... but that demonstration of quick flash steam shows that we can use a fresnel lenz to speed up the process of distilling water. So if we have barrels of lake water, we can use this setup to flash the water to steam and collect the condensate... quick and easy distillation. I wonder if this would also work for distillation of alcohol?

glad to see you making videos again

Great! Glad to see you making videos again!

yes Dan! Love love it. Thanks for showing us your tests! Inspiring

Great to see more content, Dan!

It's very strange that I just looked up this channel after so long after getting a different Google account right when you started making videos again I still have the $300 circular fresnel lens that I purchased from your Channel/website I even spoke to you on the phone I remember I removed the square edges and made it just a perfect circle for more of a Backpacker this thing still works great look forward to seeing some new videos

after all this years he still makes this funny experiments lmao

Dan The Man! I have one of these lenses but yet to make a frame and stand. Have you ever looked into using these on modified Sterling engines? Welcome back my friend!

Welcome back Dan!

Im so happy you continue making content.

Thanks for the new content! Hope to see more... 😁🤤 FOR SCIENCE!

Just stumbled across you again, Dan. Good to see you back.

Sir,, Your Work is Super & Fantastic.

Hey Dan so pleased to see another video from you after such a time! I have deduced that (especially in cold climates/ air temp) evacuated tubes with heat rods are perhaps the best heat concentrators - meaning temperature increase per surface area. Perhaps however for a given surface area, using an optical concentrator such as this coil could be better? Certainly this is alot cheaper!

Welcome back!

Thank you for the correction on WORT vs WART, auto correct thing. Also, current market conditions, making your own would probably be more cost effective... This coil was $ 39 in 2016, now, $139..

Welcome Back!!

Funny, I was thinking of doing this with the high side lines of AC lines to sanitize water in a emergency or warm small showers. They are similar in size and have been collecting a few over time, but I'm sure these stainless steel lines would tolerate more heat without melting. Thanks for the heads upnon where to look for them!

Glad to see you back, could you do a half round shiny surface behind it and reflect on the whole back and some glass in front and use no lens Put some together, probably be a effective water heater, the half round would probably have to be the size of a half barrel for the size of the Coil and maybe get some hot air through it also hope you will try it.

Love the videos! I gotta try this soon

Welcome back.

Finally back in action! 😊

I love your videos.

Nice - I believe this is how the tankless water heaters work but they use natural gas to heat up the coils and electricity for electric version. Using the sun to heat up water is also an excellent idea I remember when I left a tool outside in the sun it was so hot I had to use gloves to pick it up. Metal seems to just absorb the suns heat.

WELCOME BACK!

Hey Dan! Have not seen you in way too long!

So glad you’re still kicking around! Missed all your videos! Hey seems like noone makes evacuated solar tubes anymore?

I love fresnel lenses

Sweet post!

I have a similar design using 'Leibig condenser" type setup. But heat oil to heat the water. Proves more efficient after intial heat as less loss over time than water. (Plus oil can go to over 100°C without becoming steam) Steam equals turbine equals CHP. Combined heat and power.

I ordered a linear lens from you a while back. I just put in an order for linear actuators and sensors to automate the aiming of the lens. I was planning on using aluminum vehicle radiators as my heat exchange since this lens isn't rated to melt it and it will be on a heat exchanging loop. If I ever actually get this thing built and it works I'll drop you an email.

how would it preform with the center coil facing the spot, and maybe a thermal blanket mirror. espresso on demand for sure :)

I'm curious, would such a coil actually pump water to a higher elevation while it's being heated and turning the water to steam?

What would happen if you encased the wort chiller in a metal or ceramic case and filled it with salt to hold more heat?

Hey Dan, would you be able to do a science experience with a wort coil in sand insulated in a chamber and measuring how high and long it takes to contain the heat. Also, how long it takes to disipate running cold water threw the tubing.

Great video! Do you think the water could be heated more to make it a more useful hot water source with a longer tube and possibly more than one fresnel lens? I was thinking of your experiments from a couple years ago today, came to your channel, and look! You’re back! 👍🏻👍🏻

Nice device !! What are the best glasses to wear for solar contration projects ? Thanks !

I think you need a steel pipe for a core plus it would give you water storage to pull from.

Hello Dan welcome back.. I am a long time Is subscriber and fan. I love your new content and I hope that 1 day you will look into steam jet vacuums. I have located small injectors that usualize 1/4 inch pipe. I cannot think of a better way to create Refrigeration With a 0 carbon footprint. I feel it is highly achievable For a man with your Talent. Please considerl this informal challenge I'm sure you will get a million plus views in no time. A God gives you strength to do more.. Aloha John

Hi Dan, just wondering; does a fresnel lens still produce a bit of heat even when cloudy?

Could something like this be useful for desalination on a larger scale?

idea, what if in stead of a stationary Concentrating Solar Parabolic Trough, one made a hot house trough, where you made a roof just wide enough for the fresnel lens sideways, you put several side by side in an arc, so that they were all pointing at different angles, say 10-15 degrees difference from lens to lens, catching the sun from morning to evening and the bottom was a serpentine or coil of copper tubing so that several times through out the day the sun would hit a lens perfectly on the parabola shaped copper tubing for max heating without burning or melting anything, and the sun would continuously hit them all heating the air in side the box? would this pretty much create steam for house heading temperatures?. is there a better stationary design (no sun trackers)?

I love it.

could you pass oil or room temp molten salt and transfer to sand battery?

Where can I buy one of the fresnel lenses? All the ones I find are pocket sized

Awesome 👍 😎

i wish it was this easy to cool

HAY HAPPY NEW YEAR WHERE HAVE YOU BEEN.

Hi, how Hot can it get? dindt find similar question/ansewer in the Comments.Greet Edo P.S. Im gettin this Week 4Psc. 36cm round Lenses for a Barbeque Project with a 2mm Steelplate. My goal is to find out how hot it would get.

Hey Dan, love the videos! Do you still sell vacuum tubes?

where can i get these stainless steel stuff?

cool thanks

Can built a steam engine powered by solar

Where can we get the coils

Hey dan, would copper work? Let's say smaller fresnel lense? I have a solar water heater idea non-related I have been wanting to try. Black Reservoir inside a clear "box" with a coil possibly. Cheers, thanks for sharing for years, lol!

Soooo... Fresnel lens as a way to do thorium reactors

Make your solar heated hot water (near boiling point),then beam a condensed solar ray on the metal pipe and shoot all the steam in a Stirling engine

I think is salt what they used back then when they tried to produce steam from heating with fresnel or mirrors, the salt can be melted and thar way holds more heat. In real life the thing had leaks and they never generated anything. Maybe a ceramic is the solution, surrounded by steel so it heats water and produce steam.

👍

Wow its been years since I've seen GPS

Hello, where can we buy such a Fresnel lens? Thank you

It could be better if the tubing was in a flat cicrular coil, whit some kind of insulating backing. But it would be more prone to damage if there was no water in it.

Single pipe boilers have a very serious dangerous side affect, can burn large areas of skin in seconds, take care.

This is the shit that gets my rocks off, oh dan rojas Ahahaha

Dan, obviously a ton of material and you enjoy your projects. Mine is this: Use Solar (Fresnel) to create distilled water using sea water or "bad" city water as source. Sounds easy right? Not quite. Have you tried this? if so, doesn't it solve the world's current most pressing problem and set poor people free to "grow their own"?

wart?

copper with copper oxide burn coating for direct concentrated heat-electricity from thermo-couple electric Cu-CuO, as copper pipe, cold side inside, air or water cooled, dual function

I'd prefer the audio a bit louder.

just uncoil it and leave it under the sun and it will be more efficient at heating AND without the fresnel lens

Too bad you can't get a fresnel in a band focus so you could trough over a reflector halfpipe and make this feasible without having the focal aspect be a just a spot.

What do you think the odds are in utilizing giant arrays of fresnel lens and distillers with giant pipes that run across the States... to bring more opportunities to cultivate untouched lands... would we be able to generate enough food forests? Cultivate more compassionate natures because we wouldn't be in the clutches of those greedy corporations/gov... charging huge fees to just barely get by (if at all)...

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flattening the coil would make more sense

Where is your Wife?

WELCOME BACK!