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post #201 of 340
Thread Starter 
Today's update, a pictorial:

First of all, the 5/8th foam shipped and will be delivered Saturday! The 1-wire components should arrive tomorrow so I've been getting the Ubuntu netbook ready software-wise.




The liquid filled hydraulic pressure gauge came in yesterday. 15 PSI, 2.5" gauge, 1/4" MPT fitting on the bottom. I hope it's accurate. The 100' return/supply piping coil was also obviously purchased along with couplers and more clamps.




Where the pressure gauge is going to be mounted. Connecting it to something else like this saves me from buying two more $4.50 5/8th barbs. The compact ball valve allow me to remove the filter element without draining the top of the reservoir.




I went the easy/secure route and didn't mount the temperature probes with copper tube spacers. The T fitting will create turbulence and should keep the water flowing around them. It's not like the loop will have fast changing temperatures, high flow, or large deltas where direct stream contact is important. They are very permanently attached with nearly an inch of J-B Weld epoxy around them. The picture doesn't show it well, but the tips with the sensors do stick out of the epoxied area.




The sensor in a fitting, in the T. It hasn't been assembled so it'll be more compact when screwed in & cemented.




The soon to be 1500w heat stick for graphing the loop's cooling capacity. I thought I had a spare 12 gauge power cord, but didn't, so I couldn't start J-B welding the element into place.




I'm hyped. The 10 degrees Celsius crawl space loop temperature results (before warming up) are very encouraging. Check back in 6 months to see if I stayed under my 20 degrees Celsius peak water intake temperature goal.

post #202 of 340
OK i might have missed something but ur loop in the hole will hit nice low temps maybe to nice if u go below 20c in the summer on a humid day u will get condensation so u might need a plate exchnanger and run the ground loop threw it only when temps go up once temps come down ground loop gose off while ur computer loop runs non stop threw the plate EX

like my chiller V2.0 the thing will hit sub zero temps but it will only come on when my rez temp gose past lets say 30c and once my rez hits 22c the chiller will shut down

i build my first chiller and then i found out to much cold can be a bad thing

and as for stuff freezing on u u can use plumbing antifreeze in ur ground loop and its totaly safe as in if u spill some the epa wont shut u down
u can buy it in lows in the plumbing section and its pink
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post #203 of 340
A simpler alternative would be to just add a rad on a bypass that can be tweaked with a $6 gate valve. For the cost of running a fan(s) it can provide a wee bit of cool air and bring the loop temp up closer to the ambient/non-condensation zone.

But the ground will warm up some during the summer. Enough? I don't know. We'll all have to wait and see....

Keep in mind that the plateHX will add a delta. If that delta is beneficial 365 then that's cool. If not, then it will just reduce the performance of the loop unnecessarily...
Edited by Naja002 - 3/4/10 at 4:51am
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post #204 of 340
as alwayse naja has a good point but this cooling game comes down to picking a leser evil ither bad flow or condensation

another thing he can do is tap his pc loop into the ground loop rez if the rez temp gose up the ground loop cycels til it comes down then the ground pump stops before he gets too cold this way hes pulling water out of the rez thier is no extra suff in the way to kill flow , only thing he will need a controler to cycel his ground pump
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post #205 of 340
Thread Starter 
I don't think I mentioned the Pex piping that's going to be feed off the water hose spigot line. There's around a 40 degrees Fahrenheit summer/winter swing in my house's water temperature because of some shallowly buried piping to the pumping station. A controllable flow of this water through a heat exchanger could be a simple moderating influence on the supply line.

The dew point has become a bigger concern for me after running the crawl space loop through my blocks for the last few days. 24/7 chilled blocks have a lot of potential sweating surface area, even with the PC powered off... That's the scary part. We'll see what happens when it gets warmer and more humid.

(These PC area pipes aren't secured to the joists at the ends yet, hence the sag. I'm waiting on the thicker insulation.)




The last dozen feet of the supply trench has standing water from yesterday's melted winter mess. The geothermal trench is going to be located another 6 feet down from the pictured spot, where the ground levels off. There's going to be plenty of thermal conductivity capacity from this deep wet soil.



Its been sunny all day so I'll be able to easily finish coiling the geothermal piping after work. The total loop length is going to be a little shy of 500 feet with around 17 gallons of water. That's going to take a wee little while to fully circulate.
post #206 of 340
Better cover that PVC. It's susceptible to UV damage from sunlight. It's good to have covered or painted with a UV protectant.
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post #207 of 340
Thread Starter 
It'll survive hanging down like that until the insulation arrives in 2 days. There's two feet of extra pipe that will come up into the room once its secured to the joist.







The sensors seem to work when ghetto tested. I have Digitemp running on the ubuntu netbook and am slowly getting OWFS configured.
post #208 of 340
Thread Starter 
The coiled geothermal loop is basically finished. All that's left is to secure the return line to the side and straighten it up a bit. Before doing that I want to be absolutely sure that there's enough unused piping at both ends. Right now there's about 25 feet at both ends. Half of that be needed to come up out of the deep trench, and the rest will supplement the 50 foot runs of piping in the trench to the house.

Please excuse the camera phone photos and the excessive post processing on the first image.













The last two pictures reveal how long the coiled cooling section is. The coils start at 28 feet and end at 242. So 214 feet of coils, with a final linear length of 32 feet. That's less dense than I expected, but the length is still doable!

I'm going to straighten out, cut in half, and insulate the 100' coil tomorrow. The loop will then be fully connectible, and the geothermal trench ready to be excavated whenever convenient.
Edited by Romir - 3/5/10 at 11:26am
post #209 of 340
Quote:
Originally Posted by Romir View Post
It'll survive hanging down like that until the insulation arrives in 2 days. There's two feet of extra pipe that will come up into the room once its secured to the joist.
Oh, THAT'S where the insulation is going. Oops!

P.S. Good progress/updates.
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post #210 of 340
+1, love it.
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