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Forum: Geothermal & Heat Pumps 08-12-15, 02:36 PM
Replies: 218
Views: 117,250
Posted By AC_Hacker
I think your idea is brilliant! The...

I think your idea is brilliant!

The rationale behind GSHP & DX, etc. is to lower the amount of energy (therefore cost) to accomplish heating and cooling needs.

If you have a way that uses NO...
Forum: Geothermal & Heat Pumps 07-24-15, 11:58 AM
Replies: 218
Views: 117,250
Posted By AC_Hacker
MEMPHIS91, I was looking over your sketch,...

MEMPHIS91,

I was looking over your sketch, and I am curious why you want the compressor near the house? If your project idea is to use condensing DX inside the house, then I get it. But if your...
Forum: Geothermal & Heat Pumps 07-23-15, 11:01 AM
Replies: 218
Views: 117,250
Posted By AC_Hacker
The only problem with going too big on your...

The only problem with going too big on your tubing diameter is that you need sufficient fluid velocity (feet/minute) to keep your lubricant in suspension. If you went too big in your diameter, your...
Forum: Geothermal & Heat Pumps 07-22-15, 11:54 AM
Replies: 218
Views: 117,250
Posted By AC_Hacker
Sorry, Haven't been reading every word of...

Sorry,

Haven't been reading every word of this thread... I thought you were going HDPE, when I saw the statement about 500' coil of 3/8" tube.

But the laws of fluid friction still apply, even...
Forum: Geothermal & Heat Pumps 07-21-15, 09:14 AM
Replies: 218
Views: 117,250
Posted By AC_Hacker
You will want to check on fluid resistance in...

You will want to check on fluid resistance in pipe.

The higher the resistance, the more pump power is required to keep your circulation moving at a rate that is acceptable.

The factors that you...
Forum: Geothermal & Heat Pumps 07-18-15, 01:40 AM
Replies: 218
Views: 117,250
Posted By AC_Hacker
Randen, very good info there! I was just...

Randen, very good info there!

I was just looking on a table of Thermal Conductivity values of some common Materials and Gases (http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html)....
Forum: Geothermal & Heat Pumps 07-16-15, 08:05 PM
Replies: 218
Views: 117,250
Posted By AC_Hacker
Counter flow always better. I can't tell you...

Counter flow always better.

I can't tell you right out of the gate how much surface area, but if you are looking at examples, you may come across water-to-water examples. You might be able to do...
Forum: Geothermal & Heat Pumps 07-16-15, 12:47 PM
Replies: 218
Views: 117,250
Posted By AC_Hacker
Here is a guy who is building a counterflow tub...

Here is a guy who is building a counterflow tub in tube, with some interesting additions.

Please note that this HX is for liquid-to-liquid not refrigerant-to-liquid, so the issue of...
Forum: Geothermal & Heat Pumps 07-16-15, 08:49 AM
Replies: 218
Views: 117,250
Posted By AC_Hacker
There have been several DIY HXs similar to your...

There have been several DIY HXs similar to your drawing, done here at ER.

Acquario did a very interesting unit, that used a plastic shell and had multiple copper coils running inside, for the...
Forum: Geothermal & Heat Pumps 07-15-15, 10:48 AM
Replies: 218
Views: 117,250
Posted By AC_Hacker
I think that using HDPE for refrigeration gas...

I think that using HDPE for refrigeration gas would be a very, very bad idea.

I have serious doubt about the permeability of HDPE to pressurized refrigeration gases.

I'm concerned about how it...
Forum: Geothermal & Heat Pumps 07-15-15, 10:27 AM
Replies: 218
Views: 117,250
Posted By AC_Hacker
It would be a good idea to get several verified...

It would be a good idea to get several verified sources for these estimates.

When I was tracking this kind of thing down, I found a Canadian GSHP company that was doing vertical holes, and their...
Forum: Geothermal & Heat Pumps 07-15-15, 01:51 AM
Replies: 218
Views: 117,250
Posted By AC_Hacker
Oh boy! One amazing project after another!! ...

Oh boy! One amazing project after another!!

Personally, I think that the pond scheme could put you right up against the maximum limits of DX feasibility, what with lubrication issues, etc.

I...
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