Quote:
Originally Posted by Moontanman
Interesting Nitack, evidently the temperature gradient is quite different where you than where i live. It drops here until about 12 or 13 meters then begins a very slow rise and doesn't equal the surface temps until about 230 meters much deeper than any local wells go. How deep will your system be? Here is the depth vs temp in my area
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Well the table I posted before was actually a North Carolina location. My table follows:
Quote:
USG-1 A RESTON lat 38 49.50 long 77 42.13 11/29/79 MCCL
Temp (C) Depth (m)
12.912 4.300
12.942 4.809
12.944 5.318
12.923 5.827
12.896 6.336
12.851 6.845
12.827 7.354
12.771 7.863
12.717 8.372
12.639 8.881
12.591 9.390
12.533 9.899
12.465 10.408
12.434 10.917
12.373 11.426
12.327 11.935
12.273 12.444
12.249 12.953
12.229 13.462
12.196 13.971
12.180 14.480
12.171 14.989
12.157 15.498
12.149 16.007
12.150 16.516
12.144 17.025
12.146 17.534
12.146 18.043
12.149 18.552
12.151 19.061
12.149 19.570
12.156 20.079
12.164 20.588
12.164 21.097
12.173 21.606
12.177 22.115
12.185 22.624
12.195 23.133
12.201 23.642
12.210 24.151
12.216 24.660
12.217 25.169
12.232 25.678
12.239 26.187
12.249 26.696
12.250 27.205
12.264 27.714
12.271 28.223
12.276 28.732
12.281 29.241
12.288 29.750
12.294 30.259
12.304 30.768
12.310 31.277
12.320 31.786
12.327 32.295
12.335 32.804
12.345 33.313
12.354 33.822
12.360 34.331
12.367 34.840
12.379 35.349
12.388 35.858
12.395 36.367
12.406 36.876
12.419 37.385
12.429 37.894
12.437 38.403
12.446 38.912
12.458 39.421
12.469 39.930
12.479 40.439
12.484 40.948
12.496 41.457
12.504 41.966
12.514 42.475
12.521 42.984
12.531 43.493
12.539 44.002
12.548 44.511
12.554 45.020
12.565 45.529
12.572 46.038
12.581 46.547
12.590 47.056
12.598 47.565
12.607 48.074
12.616 48.583
12.625 49.092
12.634 49.601
12.642 50.110
12.651 50.619
12.657 51.128
12.665 51.637
12.674 52.146
12.682 52.655
12.691 53.164
12.697 53.673
12.704 54.182
12.711 54.691
12.716 55.200
12.757 57.745
12.766 58.254
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As you can see, it is pretty constant for at least the first 200 or so feet. The crawl space that I will be using is actually below ground level for the outside walls by seven feet or so, with no windows or southern sun exposure walls. I plan on dropping my system an additional 5 feet. That should get me definately to the stable temp zone. If I were to continually circulate air from these earth tubes to the air return I'm thinking that it will mitigate both the temperature and humidity of even the hottest days. And running a low power fan continually will require much less electricity than running the AC intermittently and we will have a more pleasant home temp level.
If this does work, I may use it as the jumping off point for incorporating a solar chimney design, and try to perfect an electricity free design. Or I was thinking of using something like this:
Solar Fan with 10 Watt Solar Panel. The fan will only run with the sun is out though, so that may not be optimal for warmer nights. Perhaps I can build some batteries into the mix though.
