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12 Feet Under: 1000 Square Feet of Geothermal PC Cooling - Page 30  

post #291 of 340
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Here's the messy finished heat stick. The element's hexagonal base edges had to be slightly ground down to fit into this spare 2" pvc tube. It was JB epoxy welded into place with three layers. The interior wires were also covered with epoxy and then filled with silicone through a hole drilled into the side. The electrical tape was used to cover the hole while the silicone slowly dried. With the drain port top it conveniently screws into my reservoir which keeps water flowing past the element.



Watt meter readings at 19.33 hours into the testing. It's plugged into a 14 gauge extension cord that goes to a GFCI outlet in the kitchen. The power use is slightly higher without that extra 20 feet of cord being used.




The crawl space temperature sensor (purple) is being hit by the sun, hence the swings. It's interesting to note the water temperatures are also very slightly affected at those points too. Aside from that there's not much to note about the readings so far.

Well, it looks like more than 48 hours will be required.
    
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post #292 of 340
Sir, if this has been said before, I'll say it again: You are living the dream. This is an awesome project and you rock
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post #293 of 340
if ur worryde about the ground geting heated in the summer by the sun u can lay down filter cloth over where ur pit was and cover the filter cloth in landscapeing wood chips about 2 " layer will leave the ground cold on the hotest summer day and the filter cloth will stop weeds from sprouting up among the wood chips ,but will still let water draine

and some nice stones around ur wood chip pile and u have over came the power of the sun and it will look nice too
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post #294 of 340
hey man u still alive ? i am thinking maybe u zapt ur self or something with the home made heating element ,i want to see more rusults of the heat dumping , if ur loop pans out i will dig up my back yard and cool my house like this
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post #295 of 340
LOL That heat stick looks barbaric. I like it.

Quote:
Originally Posted by shurik06_83 View Post
if ur worryde about the ground geting heated in the summer by the sun u can lay down filter cloth over where ur pit was and cover the filter cloth in landscapeing wood chips about 2 " layer will leave the ground cold on the hotest summer day and the filter cloth will stop weeds from sprouting up among the wood chips ,but will still let water draine

and some nice stones around ur wood chip pile and u have over came the power of the sun and it will look nice too
Nice!! AHHHRRGH MUST CLICK REP FOR GREEN COMMENT!! AHHHH

Quote:
Originally Posted by shurik06_83 View Post
hey man u still alive ? i am thinking maybe u zapt ur self or something with the home made heating element ,i want to see more rusults of the heat dumping , if ur loop pans out i will dig up my back yard and cool my house like this
(LoL) I hope he is okay. :-P
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post #296 of 340
Thread Starter 
I'm doing science, and I'm still alive. Well it was somewhat scientific until the flaws became apparent. At this point I'm only making a pretty graph I can compare future results to. (Ambient temperature swings are wrecking the data.)

The daily and weekly images in my last post have been updating every 5 minutes with the new results. However, here are the saved full charts of the last two days.



Cliff note legend: Blue = Water in and Red = Water out



The water out spike down at 10:45 was caused by my topping off the reservoir (loop wasn't fully bled). The element was unplugged for one minute and two cups of pre-warmed water were added. It still took a while to recover from that.



(Repost of the updating Day and Week chart)



At 10:30 this morning I placed a cardboard box in front of where the pipes exit the ground in the crawl space. The effect was visible in the exposed water out readings a few minutes later. It doesn't look like the sun was adding many BTUs directly to the loop, but the sensor was being slightly warmed.

The increased warming effect while the sun is at its strongest (9-3) is also interesting. The next time I do this test, the crawl space will be closed off and I'll have added another layer of foam to the pipes.


I'm not sure if I mentioned it, but that ground sensor's readings can't be used to accurately determine how much the ground has heated up. Its located at the start of the loop, at the side of the coils and at least a foot higher in the ground. Its more of a general ground temperature guideline to go by. That being said, the ground sensor reading has gone from 11.2c to 14.8c. The water in one has moved from 11.6c to 19.3 in 65 hours. Only 2.42c of that occurred in the last 48 hours though.

I'm really looking forward to how quickly, or slowly, the water and ground normalizes once I remove the heater at 1am tonight. I'll keep the pumping running without a load on the loop so the cooldown rate can be recorded.

The effect on the loops equilibrium should be noticeable immediately.

Yeah Shurik, I definitely need a chiller to extract heat from the ground this winter. Replacing a condenser with a heat exchanger to the ground source isn't as big of a energy saver in a temperature climate. It's nice and clean though, since the window AC unit would still be installed and used in exactly the same fashion.

Edit: The live temperature data is also updated every 5 minutes in a table here.
Edited by Romir - 3/19/10 at 3:44pm
    
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post #297 of 340
Quote:
Originally Posted by Romir View Post

Yeah Shurik, I definitely need a chiller to extract heat from the ground this winter. Replacing a condenser with a heat exchanger to the ground source isn't as big of a energy saver in a temperature climate. It's nice and clean though, since the window AC unit would still be installed and used in exactly the same fashion.
lol ur thinking of the Original Ocn A/c modder known as Naja me i would run about 2-300 ft of 1" copper line all over my yard and run the water threw a G3 accord rad wich actualy fits inside my furness and have furness fan cycel when it gets hot and have the pump cyceling non stop

been thinking about this ghetto cooling for yrs now but never have 2 key components at once time/$$$ now i have time but no $$ when i have $$ no time


if ur looking for a chiller then u are in the right place Naja and I can sort u out and get u on the path to ghetto chiling my path is slightly more ghetto
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post #298 of 340
Thread Starter 
I'm putting these pictures in their own post for the update listings.

Here's the final energy use tally at the 72 hour mark. I pulled the plug two minutes after the sensor results shown in the image, so they're spot on for the final results.



(Most of) day 3's chart of the thermal testing. Not much happened. There was a little over a 1c rise in the water temperature from the 113,000 BTUs dumped into the loop yesterday.



Its been 20 minutes and the water in temperature has already dropped 1.5 degrees Celsius.
    
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post #299 of 340
Wow that was fast
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post #300 of 340
Romir, I can hardly believe the extent to which you have carried this project, and the professionalism and efficacy with which you have implemented it. You've inspired me, and I hope you have inspired others as well. One last REP for you for making sure the system is properly gathering data, testing it, and posting the results (as well as the auto-updating HTML table. Nice touch.) I will be following this thread in the future. I'm hooked.

Quote:
Originally Posted by shurik06_83 View Post
lol ur thinking of the Original Ocn A/c modder known as Naja me i would run about 2-300 ft of 1" copper line all over my yard and run the water threw a G3 accord rad wich actualy fits inside my furness and have furness fan cycel when it gets hot and have the pump cyceling non stop

been thinking about this ghetto cooling for yrs now but never have 2 key components at once time/$$$ now i have time but no $$ when i have $$ no time


if ur looking for a chiller then u are in the right place Naja and I can sort u out and get u on the path to ghetto chiling my path is slightly more ghetto
Shurik, you've proven to me that having somewhat "unusual" English doesn't mean you aren't really intelligent. (In other words, you're really intelligent. LoL) I have learned much from you in this thread and in PM. ^_^
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