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gaiatechnician

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Posts: 36
Reply with quote  #1 
I was told to park my "system" here. It uses windowscreen to transfer air heat to water. Then the water drips away with the heat and brings it down to where you want to store the heat. The thing uses about 2/3 of a watt to pump the water. Playlist is at https://www.youtube.com/playlist?list=PLkzXlmAwZTZfdL3kdnXUFzyaH09X2Wx1-   Here is the latest video.  I want the drip to be even with minimal technology so I think the "delta" will work even if the water is dirty. Theory is that the individual cuts in the aluminum clog up at a rate that is dependent on the water flow through the cut. This might keep all drips within a certain range. (Hopefully).
Brian

mattie

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Reply with quote  #2 
Hello Gaia(great name btw )
Thanks for sharing this,interesting concept for heat transfer ,i recognise the principles of an evaporative cooler or swamp cooler(depends on your neck of the woods).This could also be a useful mechanism for aiding or increasing heat transfer to water filled barrels used as thermal mass in a greenhouse.
Regards Mattie
gaiatechnician

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Posts: 36
Reply with quote  #3 
I am keen to try this directly hooked up to a water barrel, and maybe with a solar powered water pump moving the water.  Also outdoors, with a planter or raised bed up beside a fence.  Windowscreen on the fence and lots of heat transfer to a barrel under the planter?  BUT, I have also been a lazy depresso sit around guy this month so work beakons and I have to leave all the hypothetical to other experimenters now.  Mother earth news just took this up and noted it on facebook.  So it might be a time to welcome new members.  Brian
gaiatechnician

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Reply with quote  #4 
I got some direct sunlight on the screen  today and did an update. The mother earthers were pretty insulting and some said that this idea was worthless.  The "experiment" isn't much right now, just proof of concept. But I am successfully sending heat down under the soil, and that is the whole point.   I just started turning it off at night because it acts as a heat radiator then. So, in my case at this time of year, it is strictly a very  simple low tech solar collector.   There is tonnes that I could do to optimize the different parts of the system but first, all the individual modules need to be working nicely. Might make the drip warming system independent of the drip watering system. That would mean much faster water circulation and some sort of flat tank of water under the vegetable bed. With the circulating system, I am finding that about half the heat goes into the bucket of water and warms it up. So a container under the soil might have almost double the effect.  Brian 
solardan1959

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Reply with quote  #5 
gaiatechnician,
   Maybe just an insulated bucket, (like a cooler). Have you thought about using something like twin wall poly or coroplast instead of screen? 

Dan
gaiatechnician

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Posts: 36
Reply with quote  #6 
Hi, Dan, I am just going with the window screen for now.  It is cheap and it is easy and it is there. If my greenhouse was 6 times bigger and if it got full sun, I would try lots of stuff and get useful data but it isn't.  Plus, I have a pretty large stone work job on the go right now. I have a massive pine tree to the south, too. So for another month, there will be shadows to mess with any type of side by side experiment and ruin the validity. (Until the sun's arc rises over the tree altogether).
I had this mad dream that other people would try the window screen or their own alternatives to it, "right away", and put their successes and failures on youtube, "right away". That way, gardeners would have the confidence to try this (or your better alternative in the coming growing season).  The season is coming very quickly indeed.  So, it is not the time to expect miracles from me. It is the time for small (and large) attempts from other people. By the time I have conclusive "proof" that this thing works "or not" the opportunity of other gardeners trying this is already lost. Lots of people have sunny days to soak up energy with this thing.  I don't in Victoria. It usually has a cloudy spring  where a solar collector like this will not work well.  For instance, Calgary gets way way way more sunny days in spring that I do.  Anyways, it is what it is. This is as far as I can go at this time.   Brian
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