how to make geothermal slinkies and how to get an extra 100 feet of heat exchange
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- Опубліковано 26 жов 2012
- I wanted to share how to keep the loops from kinking as you make them, show you some tips for making a better slinky work table, and tell you how to get an extra hundred feet of free heat exchange out of each loop by not mixing your outgoing loop with your return loop.
Seriously, why would anyone tie the outgoing pipe directly to the return loops? It's just plane silly to mix your hot and cold like that. Instead put the slinky return loops in the trench first and bury them in several feet of dirt, and then bring the out-flowing line to the house on top of that so you have a couple feet of dirt insulation. Then fill the rest of the trench. Water flows out the upper straight portion of pipe to the end of the trench and then to the deeper slinky loops for the trip back to the house.
Also there is much ignored middle ground between the really long 300' straight line trenches and 66' trenches with 3' loops overlapping every 18'. I have opted to not overlap loops, just putting 3' loops side by side in 100' trenches. It gets me 50% more surface area for heat exchange and I just have to dig an extra 34'.
Thank you for this. What did you use to dig the 8' x 3' trench? What was your best information source for your Geo design. Any changes or wish you would haves from this 2012 design?
Since Loops have to be placed 10 feet apart to not interfere with each other I now feel the whole separation of lines I did here by mere feet was probably pointless and maybe enen counterproductivesince it makes part of it more shallowly burried, but there is still great information here about how to make the slinky table and how to untangle the spools
Dave what tube do you recommend?
Ecellent video... Thanks!!!
Nice work. 👏
Thanks for sharing! Have u done any Solar Hot Water also?
If you do this often I'd make a large lazy susan for under the coil for easy turning.
Super interesting but the only problem I have is that it ended right when I was about to learn something, lol 😆
Dave, great video.
Separating the return line from the loops seems wise.
What length and tensile strength zip ties do you use?
Is that 1 1/2 inch HDPE? What length of looped pipe fit into your 100 ft of trench (no loop overlap)?
What size is your line? 1/2 or 3/4
wonderful video. since you have to dig the trench already, wouldn't it be faster to just lay the pipe in straight and make it loop back and forth vice in coils? Adding a manifold would allow more liquid through vice longer "under ground" time to equalize temp. the ground can only warm it up so much so temp change is more about volume vice temp.
Which type of pipe(material) used??
Lead is the best for this.
Hi Dave, when you do this design, how many feet of HDPE pipe are you installing per slinky loop?
600'
Thanks Dave, so the slinky uses up about 500' of the 600' for a 100' trench and then 100' to get back to the header which equals a 600 foot coil?
+jason schmidt yes
How did you determine what length you needed and what did you use for your heat pump/ductwork?
Hello. All this video about geothermal systems are 5-6 years old. Is there any positive results on this by now?
makes one feel like its a hype and it has died down right?
@@shilezi i have the same feeling
Electrical tape works well and cheaper than zip ties.
No shit man, of course you get extra heat exchange but you are digging more, the whole points of loops is to dig less, hell if you want to be as efficient as possible just don't coil them and put them straight. Also not passing the cold near the warm is redundant because it's such tiny amount of time since it's going straight, besides it pre heating the incoming water which is just going to get hotter sooner.
Look all i'm saying is the benefit of looping is not digging as much and the trade of is efficiency, you know you can also just dig a U shaped trench and loop the pipes the whole way.
I dont use zip tie they will work. I'll dig then stake it down with 8" sod steaks. More than likely you'll want to headed it off and run multiple loops to keep the head pressure down if not you'll burn through pumps or possibly not get enough water back . I always cut out any kinks more than likely it will cause problems if you have a dirty air filter in the heating season the system will pull into a vacuum on the loop side the pipe will collapse under the ground. That's just my experience and I've installed well over 200 systems. any one need a tech or just has questions. pm me. new and used equipment available. 🐓
How do we contact you? I am interested in a system and we live in Puerto Rico so I only need the cooling part I think. Jgrass@grasselectric.com
next time use black zip ties the are uv resistant, nice job!
Yeah, that damn uv underground...
Do you think this matters if the loops are going to remain above ground for less than a few days?
He was making a joke!! people! I thought is was funny T Huss
Why would you do a slinky? In the amount of time it takes you just to make a slinky loop, We would have a 6-pipe dug, installed and be on the road back home. Very curious why anyone would do a slinky.
Not geothermal it's ground source. Geothermal is when you drill down deep into the earth say 10km until you hit hot rocks
Ok ok but please don't call wind turbines windmills lol
Humm.... Put heat in ground, pull heat out of ground.... Hmmmm. Toe may toe. Toe mau toe. Still taste good